This document discusses the use of diuretics in congestive heart failure (CHF). It defines CHF and describes the signs, symptoms, and pathophysiology. The main therapeutic objectives for CHF are to relieve symptoms, enhance quality of life, prevent complications, and prolong life. Diuretics are effective for symptomatic relief in CHF patients with edema by rapidly relieving dyspnea. The document reviews the different classes of diuretics, their mechanisms of action, pharmacokinetic profiles, dosages, adverse effects, interactions, and considerations for resistance. Combination diuretic therapy can be effective for patients who do not respond to single agents.
heparin in detail : mechanism of action, pharmacokinetics, clinical uses, adverse effect and contraindication of heparin and low molecular heparin.
for undergraduates.
role of diuretics in the management of congestive heart failurePriyatham Kasaraneni
Diuretics are used to treat congestive heart failure (CHF) by reducing preload and removing edema. They work by increasing urination and fluid loss. Loop diuretics like furosemide are most effective for rapid fluid removal in moderate to severe CHF. Thiazide diuretics are used for mild to moderate cases. Both can cause side effects like hypokalemia and hyponatremia. K+ sparing diuretics and aldosterone inhibitors are also used alone or combined with other diuretics to prevent electrolyte loss. Diuretics relieve symptoms of CHF but do not cure its underlying causes.
This document summarizes drugs used to treat three blood dysfunctions: thrombosis, bleeding, and anemia. It discusses anticoagulant and thrombolytic drugs used to treat thrombosis. Anticoagulants like heparin and warfarin prevent clotting through different mechanisms. Heparin enhances antithrombin inhibition of coagulation factors. Warfarin inhibits vitamin K-dependent clotting factor synthesis. Thrombolytics like plasmin dissolve clots by activating plasminogen. The document also covers the mechanisms, uses, and toxicities of various anticoagulant and thrombolytic drugs.
Class II antiarrhythmic drugs are beta blockers that reduce sympathetic tone in the heart by blocking beta-1 and beta-2 receptors. They are useful for treating supraventricular arrhythmias by slowing heart rate and conduction through the AV node. Common Class II drugs include propranolol, metoprolol, and atenolol which are effective at preventing recurrence of atrial fibrillation and reducing ventricular rate during atrial fibrillation.
This document discusses antiarrhythmic drugs, their mechanisms of action, classifications, and effects on cardiac electrophysiology. It covers 4 main classes of antiarrhythmic drugs - Class I agents which affect sodium channels, Class II agents which are beta blockers, Class III agents which affect potassium channels, and Class IV agents which affect calcium channels. Specific drugs from each class are described in detail including their indications, mechanisms, dosages, side effects, and drug interactions. The document provides an overview of the pharmacological treatment of cardiac arrhythmias.
This document discusses antiarrhythmic drugs used to treat irregular heart rhythms. It begins by defining different types of arrhythmias including bradyarrhythmias, tachyarrhythmias, and heart block. The causes of arrhythmias are then explained as enhanced automaticity, triggered activity, reentry, and fractionation of impulses. Common arrhythmia conditions seen clinically are also outlined. The document then discusses the Vaughan-Williams classification system for antiarrhythmic drugs and provides details on representative drugs from each class, including their mechanisms of action and uses.
This document discusses antiarrhythmic drugs used to treat irregular heart rhythms or arrhythmias. It describes the mechanisms that can cause arrhythmias such as enhanced pacemaker activity, after-depolarizations, and reentry. It then covers the major classes of antiarrhythmic drugs including class I sodium channel blockers, class II beta blockers, class III potassium channel blockers, and class IV calcium channel blockers. Specific drugs from each class are discussed, how they work, their therapeutic uses, and potential side effects. Common arrhythmias like atrial fibrillation, atrial flutter, and ventricular tachycardia are also defined.
The document discusses hypertension and its treatment with angiotensin converting enzyme (ACE) inhibitors. It defines hypertension and describes how it results from increased vascular resistance. It then discusses several classes of drugs used to treat hypertension, focusing on ACE inhibitors. Specific ACE inhibitors discussed include captopril, enalapril, and ramipril. Their mechanisms of action involve blocking the conversion of angiotensin I to the vasoconstrictor angiotensin II. This decreases blood pressure by reducing angiotensin II levels and increasing bradykinin. Their clinical uses and adverse effects are also summarized.
heparin in detail : mechanism of action, pharmacokinetics, clinical uses, adverse effect and contraindication of heparin and low molecular heparin.
for undergraduates.
role of diuretics in the management of congestive heart failurePriyatham Kasaraneni
Diuretics are used to treat congestive heart failure (CHF) by reducing preload and removing edema. They work by increasing urination and fluid loss. Loop diuretics like furosemide are most effective for rapid fluid removal in moderate to severe CHF. Thiazide diuretics are used for mild to moderate cases. Both can cause side effects like hypokalemia and hyponatremia. K+ sparing diuretics and aldosterone inhibitors are also used alone or combined with other diuretics to prevent electrolyte loss. Diuretics relieve symptoms of CHF but do not cure its underlying causes.
This document summarizes drugs used to treat three blood dysfunctions: thrombosis, bleeding, and anemia. It discusses anticoagulant and thrombolytic drugs used to treat thrombosis. Anticoagulants like heparin and warfarin prevent clotting through different mechanisms. Heparin enhances antithrombin inhibition of coagulation factors. Warfarin inhibits vitamin K-dependent clotting factor synthesis. Thrombolytics like plasmin dissolve clots by activating plasminogen. The document also covers the mechanisms, uses, and toxicities of various anticoagulant and thrombolytic drugs.
Class II antiarrhythmic drugs are beta blockers that reduce sympathetic tone in the heart by blocking beta-1 and beta-2 receptors. They are useful for treating supraventricular arrhythmias by slowing heart rate and conduction through the AV node. Common Class II drugs include propranolol, metoprolol, and atenolol which are effective at preventing recurrence of atrial fibrillation and reducing ventricular rate during atrial fibrillation.
This document discusses antiarrhythmic drugs, their mechanisms of action, classifications, and effects on cardiac electrophysiology. It covers 4 main classes of antiarrhythmic drugs - Class I agents which affect sodium channels, Class II agents which are beta blockers, Class III agents which affect potassium channels, and Class IV agents which affect calcium channels. Specific drugs from each class are described in detail including their indications, mechanisms, dosages, side effects, and drug interactions. The document provides an overview of the pharmacological treatment of cardiac arrhythmias.
This document discusses antiarrhythmic drugs used to treat irregular heart rhythms. It begins by defining different types of arrhythmias including bradyarrhythmias, tachyarrhythmias, and heart block. The causes of arrhythmias are then explained as enhanced automaticity, triggered activity, reentry, and fractionation of impulses. Common arrhythmia conditions seen clinically are also outlined. The document then discusses the Vaughan-Williams classification system for antiarrhythmic drugs and provides details on representative drugs from each class, including their mechanisms of action and uses.
This document discusses antiarrhythmic drugs used to treat irregular heart rhythms or arrhythmias. It describes the mechanisms that can cause arrhythmias such as enhanced pacemaker activity, after-depolarizations, and reentry. It then covers the major classes of antiarrhythmic drugs including class I sodium channel blockers, class II beta blockers, class III potassium channel blockers, and class IV calcium channel blockers. Specific drugs from each class are discussed, how they work, their therapeutic uses, and potential side effects. Common arrhythmias like atrial fibrillation, atrial flutter, and ventricular tachycardia are also defined.
The document discusses hypertension and its treatment with angiotensin converting enzyme (ACE) inhibitors. It defines hypertension and describes how it results from increased vascular resistance. It then discusses several classes of drugs used to treat hypertension, focusing on ACE inhibitors. Specific ACE inhibitors discussed include captopril, enalapril, and ramipril. Their mechanisms of action involve blocking the conversion of angiotensin I to the vasoconstrictor angiotensin II. This decreases blood pressure by reducing angiotensin II levels and increasing bradykinin. Their clinical uses and adverse effects are also summarized.
Introduction to diuretics.
Therapeutic approaches.
Normal physiology of urine formation.
Classification of drugs .
Mechanism of action of Acetazolamide.
Mechanism of action of Thiazides.
Mechanism of action of Loop diuretics.
Mechanism of action of potassium sparing diuretics &aldosterone antagonists.
This document outlines information about the anticoagulant drug warfarin. It discusses that warfarin was discovered after cows ate spoiled clover and died of hemorrhaging. Warfarin works by inhibiting vitamin K epoxide reductase, preventing vitamin K from being reduced to its active form and inhibiting coagulation factors II, VII, IX, and X. It has a nearly 100% oral bioavailability and is highly protein bound. Warfarin is used to prevent thromboembolic disorders and is monitored through prothrombin time and INR levels. It can cause bleeding and interacts with many other drugs through pharmacokinetic and pharmacodynamic mechanisms. Overdose is managed by stopping the drug and administer
Here are some key drug and food interactions to consider with warfarin:
- Thyroid medications, metronidazole, fluconazole/azoles can increase INR. Monitor more closely.
- Certain antibiotics like 2nd/3rd gen cephalosporins, broad spectrum antibiotics can interact. Monitor INR.
- Alcohol in excess and amiodarone can potentiate warfarin's effects. Limit intake.
- Azithromycin, some statins, and omeprazole have been associated with interactions. Monitor INR.
- Phenytoin can decrease warfarin's effects. May require warfarin dose adjustment.
- Grapefruit juice
This document discusses the role of beta blockers in the treatment of hypertension. It covers the pharmacodynamics and pharmacokinetics of beta blockers, specific agents used, their adverse effects, history of use, and concerns regarding their use. While beta blockers were previously considered first-line treatment for hypertension, more recent trials have shown other agents may provide better outcomes. However, beta blockers are still important treatment options, especially newer vasodilating agents like nebivolol and carvedilol which have shown benefits over older non-vasodilating beta blockers.
Congestive heart failure is a complex clinical syndrome characterized by abnormalities of left ventricular function and neurohormonal regulation. It occurs when the heart cannot pump enough blood to meet the body's needs. The pathophysiology involves compensatory mechanisms like increased sympathetic discharge and activation of the renin-angiotensin-aldosterone system which initially help but eventually worsen the heart's function. Congestive heart failure can be classified based on cardiac output level and the side of heart involved. Treatment focuses on relieving symptoms through diuretics, vasodilators, and other drugs while also arresting disease progression with ACE inhibitors, beta-blockers, and aldosterone antagonists.
This document provides an overview of nitrates in the management of angina pectoris. It defines angina pectoris and its types, and describes the pathophysiology and rationale for using nitrates. It discusses the class and examples of nitrates, their mechanisms of action, effects, dosages, and interactions. It describes nitrate tolerance and the benefits of nitrate combinations with beta-blockers or calcium channel blockers. In conclusion, the document states that nitrates decrease preload while calcium channel blockers decrease afterload, and beta-blockers decrease heart rate and contractions, making all three drugs beneficial when used together for treating angina.
Any substance that promotes the production of urine
All diuretics increase the excretion of water from bodies
Alternatively, an antidiuretic such as vasopressin, or antidiuretic hormone.
Diuretics are used to treat heart failure, liver cirrhosis, hypertension, water poisoning, and certain kidney diseases
the detail study of diuretics which include their drugs, use,classification of diuretics, side effect, mechanism of action, metabolism, synthesis etc. this all things are cover in this presentation.
This document discusses the pharmacology of antiarrhythmic drugs. It begins by defining cardiac arrhythmias and their underlying mechanisms, including abnormal automaticity, impaired conduction, afterdepolarizations, and reentry. It then classifies antiarrhythmic drugs according to their primary electrophysiological actions on sodium, potassium, or calcium channels. Several example drugs are discussed in depth, including their mechanisms of action, effects, uses, and adverse effects. The document provides an overview of important cardiac arrhythmias and categorizes antiarrhythmic drugs into four classes based on their predominant mechanisms and sites of action.
Diuretics
Pharmacology
Katzung
Abnormalities in fluid volume and electrolyte composition are common and important clinical disorders. Drugs that block specific transport functions of the renal tubules are valuable clinical tools in the treatment of these disorders. Although various agents that increase urine volume (diuretics) have been described since antiquity, it was not until 1937 that carbonic anhydrase inhibitors were first described and not until 1957 that a much more useful and powerful diuretic agent (chlorothiazide) became available. Technically, a “diuretic” is an agent that increases urine volume, whereas a “natriuretic” causes an increase in renal sodium excretion and an “aquaretic” increases excretion of solute-free water. Because natriuretics almost always also increase water excretion, they are usually called diuretics. Osmotic diuretics and antidiuretic hormone antagonists (see Agents That Alter Water Excretion) are aquaretics that are not directly natriuretic.
Calcium channel blockers (CCBs) are a class of drugs that inhibit the movement of calcium ions across cell membranes. There are three main classes of CCBs: dihydropyridines like nifedipine, phenylalkylamines like verapamil, and benzothiazepines like diltiazem. CCBs work by blocking L-type calcium channels in cardiac and vascular smooth muscle cells, which decreases calcium entry and inhibits contraction. This leads to vasodilation, reduced peripheral resistance, and decreased blood pressure and workload on the heart. Common uses of CCBs include hypertension, angina, arrhythmias, and migraines. Adverse effects vary between classes but can
Trikat MR is used to treat angina pectoris by protecting heart cells from reduced oxygen supply. It works by inhibiting fatty acid oxidation and increasing glucose oxidation, allowing the heart to function more efficiently during ischemia. The recommended dosage is one 35 mg tablet twice daily with meals. Common side effects include dizziness, headache, and abdominal pain. Trikat MR is contraindicated in patients with movement disorders or severe renal impairment.
1. Heart failure occurs when the heart muscle is unable to pump enough blood to meet the body's needs. Initially, the heart tries to compensate by enlarging, increasing muscle mass, and pumping faster.
2. There are two main types of heart failure - left-sided and right-sided - depending on which side of the heart is unable to function effectively.
3. Pharmacological therapies for heart failure include ACE inhibitors, beta-blockers, diuretics, aldosterone receptor antagonists, and digoxin, which work to reduce symptoms, decrease hospitalizations, and improve survival.
Dr. D. K. Brahma discusses antiplatelet drugs, which interfere with platelet function and are useful for preventing thromboembolic disorders. The document defines antiplatelet drugs and describes the role of platelets in thrombosis formation. It then discusses the mechanisms of various antiplatelet drugs including aspirin, dipyridamole, ticlodipine, clopidogrel, prasugrel, and GPIIb/IIIa receptor antagonists like abciximab. The uses of these antiplatelet drugs for conditions like heart attacks, strokes, angioplasty and stents are summarized.
This document discusses drug therapy for heart failure. It begins by defining heart failure and describing the stages and phenotypes. The main causes of heart failure are then outlined, including ischemic heart disease, hypertension, cardiomyopathy, infections, toxins, and valvular disease. The document discusses the pathophysiology of heart failure in terms of ventricular dysfunction, compensatory mechanisms like the Frank-Starling mechanism and neurohormonal activation, and the determinants of ventricular function. General treatment measures and pharmacological management are described for different stages of heart failure.
Glimepiride is an effective second-generation sulfonylurea for treating type 2 diabetes that offers several advantages over other sulfonylureas. It is more specific to pancreatic beta cells, improving both first and second phase insulin secretion. It also has extrapancreatic glucose-lowering effects and a longer duration of action from once-daily dosing. Glimepiride has a favorable safety profile with fewer side effects like hypoglycemia compared to other sulfonylureas.
This document discusses antihypertensive drugs used to treat hypertension. It defines hypertension and classifies blood pressure levels. It covers the causes of primary and secondary hypertension. Non-pharmacological treatments including lifestyle modifications are outlined. The major classes of antihypertensive drugs are described as sympatholytics, vasodilators, agents acting on the renin-angiotensin-aldosterone system, and diuretics. Examples are provided for each subclass. The document concludes that hypertension is common and can be treated through medication and lifestyle changes.
This document discusses different classes of diuretic drugs, including their mechanisms of action, structures, and uses. It focuses on loop diuretics, describing how they work by inhibiting sodium reabsorption in the ascending limb of the loop of Henle. Adverse effects of loop diuretics include electrolyte abnormalities like hypokalemia. The structure-activity relationships of loop diuretics are also covered, noting features like the carbonyl group and sulfamoyl substituents that contribute to diuretic potency. Loop diuretics are used to treat various conditions involving edema.
Digoxin toxicity is caused by digoxin, a plant-derived cardiac glycoside used to treat heart conditions. It has a narrow therapeutic window, so toxicity can easily occur. Common signs of toxicity include arrhythmias such as heart block or tachycardia. Management involves discontinuing digoxin, treating arrhythmias, correcting electrolyte imbalances, and using digoxin antibody fragments for severe toxicity. Factors like renal impairment, hypokalemia, and drug interactions can precipitate or worsen digoxin toxicity.
This document summarizes diuretic drugs. It discusses how diuretics work by increasing urine output through inhibiting sodium reabsorption in the kidneys. The main types of diuretics covered are loop diuretics, thiazide diuretics, and osmotic diuretics. Specific diuretic drugs discussed include furosemide, hydrochlorothiazide, and mannitol. The document also reviews the mechanisms and side effects of different classes of diuretic medications.
Diuretics act at different sites along the nephron to promote the excretion of sodium, chloride, and water. The main classes are carbonic anhydrase inhibitors, loop diuretics, thiazides, potassium-sparing diuretics, and osmotic diuretics. They are used to treat conditions like edema, hypertension, and liver cirrhosis. Each class has a distinct mechanism of action and side effect profile. For example, loop diuretics inhibit sodium reabsorption in the loop of Henle but can cause ototoxicity, while thiazides target the distal tubule and cause hypokalemia. The site and mechanism of the drug determines its clinical applications and adverse effects
Introduction to diuretics.
Therapeutic approaches.
Normal physiology of urine formation.
Classification of drugs .
Mechanism of action of Acetazolamide.
Mechanism of action of Thiazides.
Mechanism of action of Loop diuretics.
Mechanism of action of potassium sparing diuretics &aldosterone antagonists.
This document outlines information about the anticoagulant drug warfarin. It discusses that warfarin was discovered after cows ate spoiled clover and died of hemorrhaging. Warfarin works by inhibiting vitamin K epoxide reductase, preventing vitamin K from being reduced to its active form and inhibiting coagulation factors II, VII, IX, and X. It has a nearly 100% oral bioavailability and is highly protein bound. Warfarin is used to prevent thromboembolic disorders and is monitored through prothrombin time and INR levels. It can cause bleeding and interacts with many other drugs through pharmacokinetic and pharmacodynamic mechanisms. Overdose is managed by stopping the drug and administer
Here are some key drug and food interactions to consider with warfarin:
- Thyroid medications, metronidazole, fluconazole/azoles can increase INR. Monitor more closely.
- Certain antibiotics like 2nd/3rd gen cephalosporins, broad spectrum antibiotics can interact. Monitor INR.
- Alcohol in excess and amiodarone can potentiate warfarin's effects. Limit intake.
- Azithromycin, some statins, and omeprazole have been associated with interactions. Monitor INR.
- Phenytoin can decrease warfarin's effects. May require warfarin dose adjustment.
- Grapefruit juice
This document discusses the role of beta blockers in the treatment of hypertension. It covers the pharmacodynamics and pharmacokinetics of beta blockers, specific agents used, their adverse effects, history of use, and concerns regarding their use. While beta blockers were previously considered first-line treatment for hypertension, more recent trials have shown other agents may provide better outcomes. However, beta blockers are still important treatment options, especially newer vasodilating agents like nebivolol and carvedilol which have shown benefits over older non-vasodilating beta blockers.
Congestive heart failure is a complex clinical syndrome characterized by abnormalities of left ventricular function and neurohormonal regulation. It occurs when the heart cannot pump enough blood to meet the body's needs. The pathophysiology involves compensatory mechanisms like increased sympathetic discharge and activation of the renin-angiotensin-aldosterone system which initially help but eventually worsen the heart's function. Congestive heart failure can be classified based on cardiac output level and the side of heart involved. Treatment focuses on relieving symptoms through diuretics, vasodilators, and other drugs while also arresting disease progression with ACE inhibitors, beta-blockers, and aldosterone antagonists.
This document provides an overview of nitrates in the management of angina pectoris. It defines angina pectoris and its types, and describes the pathophysiology and rationale for using nitrates. It discusses the class and examples of nitrates, their mechanisms of action, effects, dosages, and interactions. It describes nitrate tolerance and the benefits of nitrate combinations with beta-blockers or calcium channel blockers. In conclusion, the document states that nitrates decrease preload while calcium channel blockers decrease afterload, and beta-blockers decrease heart rate and contractions, making all three drugs beneficial when used together for treating angina.
Any substance that promotes the production of urine
All diuretics increase the excretion of water from bodies
Alternatively, an antidiuretic such as vasopressin, or antidiuretic hormone.
Diuretics are used to treat heart failure, liver cirrhosis, hypertension, water poisoning, and certain kidney diseases
the detail study of diuretics which include their drugs, use,classification of diuretics, side effect, mechanism of action, metabolism, synthesis etc. this all things are cover in this presentation.
This document discusses the pharmacology of antiarrhythmic drugs. It begins by defining cardiac arrhythmias and their underlying mechanisms, including abnormal automaticity, impaired conduction, afterdepolarizations, and reentry. It then classifies antiarrhythmic drugs according to their primary electrophysiological actions on sodium, potassium, or calcium channels. Several example drugs are discussed in depth, including their mechanisms of action, effects, uses, and adverse effects. The document provides an overview of important cardiac arrhythmias and categorizes antiarrhythmic drugs into four classes based on their predominant mechanisms and sites of action.
Diuretics
Pharmacology
Katzung
Abnormalities in fluid volume and electrolyte composition are common and important clinical disorders. Drugs that block specific transport functions of the renal tubules are valuable clinical tools in the treatment of these disorders. Although various agents that increase urine volume (diuretics) have been described since antiquity, it was not until 1937 that carbonic anhydrase inhibitors were first described and not until 1957 that a much more useful and powerful diuretic agent (chlorothiazide) became available. Technically, a “diuretic” is an agent that increases urine volume, whereas a “natriuretic” causes an increase in renal sodium excretion and an “aquaretic” increases excretion of solute-free water. Because natriuretics almost always also increase water excretion, they are usually called diuretics. Osmotic diuretics and antidiuretic hormone antagonists (see Agents That Alter Water Excretion) are aquaretics that are not directly natriuretic.
Calcium channel blockers (CCBs) are a class of drugs that inhibit the movement of calcium ions across cell membranes. There are three main classes of CCBs: dihydropyridines like nifedipine, phenylalkylamines like verapamil, and benzothiazepines like diltiazem. CCBs work by blocking L-type calcium channels in cardiac and vascular smooth muscle cells, which decreases calcium entry and inhibits contraction. This leads to vasodilation, reduced peripheral resistance, and decreased blood pressure and workload on the heart. Common uses of CCBs include hypertension, angina, arrhythmias, and migraines. Adverse effects vary between classes but can
Trikat MR is used to treat angina pectoris by protecting heart cells from reduced oxygen supply. It works by inhibiting fatty acid oxidation and increasing glucose oxidation, allowing the heart to function more efficiently during ischemia. The recommended dosage is one 35 mg tablet twice daily with meals. Common side effects include dizziness, headache, and abdominal pain. Trikat MR is contraindicated in patients with movement disorders or severe renal impairment.
1. Heart failure occurs when the heart muscle is unable to pump enough blood to meet the body's needs. Initially, the heart tries to compensate by enlarging, increasing muscle mass, and pumping faster.
2. There are two main types of heart failure - left-sided and right-sided - depending on which side of the heart is unable to function effectively.
3. Pharmacological therapies for heart failure include ACE inhibitors, beta-blockers, diuretics, aldosterone receptor antagonists, and digoxin, which work to reduce symptoms, decrease hospitalizations, and improve survival.
Dr. D. K. Brahma discusses antiplatelet drugs, which interfere with platelet function and are useful for preventing thromboembolic disorders. The document defines antiplatelet drugs and describes the role of platelets in thrombosis formation. It then discusses the mechanisms of various antiplatelet drugs including aspirin, dipyridamole, ticlodipine, clopidogrel, prasugrel, and GPIIb/IIIa receptor antagonists like abciximab. The uses of these antiplatelet drugs for conditions like heart attacks, strokes, angioplasty and stents are summarized.
This document discusses drug therapy for heart failure. It begins by defining heart failure and describing the stages and phenotypes. The main causes of heart failure are then outlined, including ischemic heart disease, hypertension, cardiomyopathy, infections, toxins, and valvular disease. The document discusses the pathophysiology of heart failure in terms of ventricular dysfunction, compensatory mechanisms like the Frank-Starling mechanism and neurohormonal activation, and the determinants of ventricular function. General treatment measures and pharmacological management are described for different stages of heart failure.
Glimepiride is an effective second-generation sulfonylurea for treating type 2 diabetes that offers several advantages over other sulfonylureas. It is more specific to pancreatic beta cells, improving both first and second phase insulin secretion. It also has extrapancreatic glucose-lowering effects and a longer duration of action from once-daily dosing. Glimepiride has a favorable safety profile with fewer side effects like hypoglycemia compared to other sulfonylureas.
This document discusses antihypertensive drugs used to treat hypertension. It defines hypertension and classifies blood pressure levels. It covers the causes of primary and secondary hypertension. Non-pharmacological treatments including lifestyle modifications are outlined. The major classes of antihypertensive drugs are described as sympatholytics, vasodilators, agents acting on the renin-angiotensin-aldosterone system, and diuretics. Examples are provided for each subclass. The document concludes that hypertension is common and can be treated through medication and lifestyle changes.
This document discusses different classes of diuretic drugs, including their mechanisms of action, structures, and uses. It focuses on loop diuretics, describing how they work by inhibiting sodium reabsorption in the ascending limb of the loop of Henle. Adverse effects of loop diuretics include electrolyte abnormalities like hypokalemia. The structure-activity relationships of loop diuretics are also covered, noting features like the carbonyl group and sulfamoyl substituents that contribute to diuretic potency. Loop diuretics are used to treat various conditions involving edema.
Digoxin toxicity is caused by digoxin, a plant-derived cardiac glycoside used to treat heart conditions. It has a narrow therapeutic window, so toxicity can easily occur. Common signs of toxicity include arrhythmias such as heart block or tachycardia. Management involves discontinuing digoxin, treating arrhythmias, correcting electrolyte imbalances, and using digoxin antibody fragments for severe toxicity. Factors like renal impairment, hypokalemia, and drug interactions can precipitate or worsen digoxin toxicity.
This document summarizes diuretic drugs. It discusses how diuretics work by increasing urine output through inhibiting sodium reabsorption in the kidneys. The main types of diuretics covered are loop diuretics, thiazide diuretics, and osmotic diuretics. Specific diuretic drugs discussed include furosemide, hydrochlorothiazide, and mannitol. The document also reviews the mechanisms and side effects of different classes of diuretic medications.
Diuretics act at different sites along the nephron to promote the excretion of sodium, chloride, and water. The main classes are carbonic anhydrase inhibitors, loop diuretics, thiazides, potassium-sparing diuretics, and osmotic diuretics. They are used to treat conditions like edema, hypertension, and liver cirrhosis. Each class has a distinct mechanism of action and side effect profile. For example, loop diuretics inhibit sodium reabsorption in the loop of Henle but can cause ototoxicity, while thiazides target the distal tubule and cause hypokalemia. The site and mechanism of the drug determines its clinical applications and adverse effects
ANTI HYPERTENSIVE AGENTS [MEDICINAL CHEMISTRY] BY P.RAVISANKAR, HYPERTENSION,...Dr. Ravi Sankar
ANTI HYPERTENSIVE AGENTS [MEDICINAL CHEMISTRY] BY P.RAVISANKAR, HYPERTENSION,TYPES,CAUSES OF HYPERTENSION, CLASSIFICATION, MECHANISM OF ACTION, SAR, ACE INHIBITORS, ARB , DIURETICS(WATER PILLS), TIPS TO STOP SILENT KILLER.
BY P. RAVISANKAR, VIGNAN PHARMACY COLLEGE, VADLAMUDI, GUNTUR,A.P, INDIA.
Pyrantel pamoate is a medication used to treat intestinal worm infections like pinworm, roundworm, and hookworm. It acts as a neuromuscular blocking agent and cholinesterase inhibitor. Pyrantel pamoate is moderately effective against hookworms but less effective against N. americanus. It is not effective for trichuriasis or strongyloidiasis. Common side effects include nausea, vomiting, diarrhea, and abdominal cramps. Pyrantel pamoate should be used with caution in young children and those with liver disease or intestinal obstruction.
This document discusses congestive heart failure (CHF). It provides epidemiological data on CHF, showing it affects millions of people worldwide and costs billions of dollars annually. It defines CHF as the heart's inability to meet circulatory demands and classifies it based on location (left vs right heart) and time course (acute vs chronic). Causes of acute and chronic CHF include myocardial infarction, hypertension, valvular diseases, and cardiomyopathies. The pathophysiology of CHF involves systolic and diastolic dysfunction that can lead to ventricular hypertrophy, dilation, and neurohormonal activation causing further organ damage.
Pathophysiology of congestive heart failurethunderrajesh
This document provides an overview of congestive heart failure, including its definition, types, causes, symptoms, complications, diagnosis, and treatment. Congestive heart failure occurs when the heart muscle is weakened and cannot pump blood effectively, leading to fluid buildup in tissues and organs. The main types are systolic and diastolic dysfunction. Common causes include hypertension, coronary artery disease, and valvular issues. Symptoms involve fatigue, shortness of breath, and swelling. Treatment focuses on medications like ACE inhibitors, diuretics, beta blockers, and lifestyle changes such as diet, exercise, and stress reduction.
This document discusses challenging cases of acute heart failure involving diuretic resistance. It begins by defining diuretic resistance as a poor response to diuretic therapy, characterized by persistent signs and symptoms despite treatment. The pathophysiology of diuretic resistance is incompletely understood but may involve factors like RAAS activation, decreased renal function and blood flow, and distal tubular sodium reabsorption. The document reviews potential treatments for diuretic resistance including increasing and switching diuretic medications, adding mineralocorticoid receptor antagonists or thiazides, intravenous diuretic administration, and in select cases ultrafiltration. Early identification of diuretic resistance is important and associated with worse patient outcomes.
Este documento describe diferentes tipos de diuréticos, incluyendo diuréticos del asa de Henle, diuréticos tiazídicos, diuréticos ahorradores de potasio e inhibidores de la anhidrasa carbónica. Los diuréticos del asa de Henle son los más eficaces ya que inhiben la reabsorción de sodio y cloro en el asa de Henle, lo que reduce la osmolaridad de la médula renal y aumenta la diuresis. Los diferentes diuréticos actúan en diferentes partes
This document discusses diuretic resistance and its management. It begins with an overview of diuretic pharmacology and mechanisms of resistance, such as excess sodium intake and increased distal nephron transport. It then examines resistance in specific clinical contexts like renal insufficiency, heart failure, nephrotic syndrome, and cirrhosis. Management focuses on verifying compliance, treating underlying diseases, maximizing drug delivery, using sufficient doses, combining diuretics synergistically, and avoiding overaggressive BP or RAAS inhibition. The document recommends a stepwise approach starting with bolus loop diuretic doses and considering continuous infusion if needed.
Diuretics are commonly used to treat hypertension in patients with chronic kidney disease (CKD). The ALLHAT trial found thiazide-type diuretics were superior to other antihypertensives in preventing cardiovascular disease and were less expensive. In CKD, loop diuretics are recommended for patients with a GFR <30 mL/min, while thiazide diuretics can be used for those with a GFR ≥30 mL/min. Combination diuretic therapy may be needed to overcome diuretic resistance seen in CKD. Close monitoring is required due to risks of electrolyte abnormalities and dehydration.
Diuretics are chemicals that increase urine formation by increasing sodium and chloride ion excretion. There are several classes of diuretics that act at different sites along the nephron. Loop diuretics act in the ascending loop of Henle by inhibiting sodium-potassium-chloride transport. Thiazides act in the distal convoluted tubule by inhibiting sodium and chloride transport. Carbonic anhydrase inhibitors act in the proximal tubule by inhibiting the enzyme carbonic anhydrase. Potassium-sparing diuretics act in the collecting duct and do not promote potassium secretion. Osmotic diuretics act by increasing osmotic pressure in the proximal tubule and loop of Henle to prevent water
Diuretic agents work by increasing urine output and sodium excretion. There are several classes of diuretics including carbonic anhydrase inhibitors, loop diuretics, osmotic diuretics, potassium-sparing diuretics, and thiazide diuretics. Nursing care involves monitoring for therapeutic and adverse effects such as hypokalemia, hypotension, and fluid imbalance.
A diuretic is a chemical that increases urine production by inhibiting sodium reabsorption in the nephron at four major sites. The primary sites are the proximal tubule, thick ascending limb of Henle's loop, distal convoluted tubule, and connecting tubule/cortical collecting tubule. Diuretics work by blocking sodium transport mechanisms like cotransporters at these sites, causing increased excretion of sodium and water. The specific transport mechanisms and diuretic drug targets vary between nephron segments.
Diuretics, cardiovascular drugs, antiplatelets n anticoagulant.soumyakanta
The document discusses the sites of action and mechanisms of various classes of diuretic drugs. Osmotic diuretics like mannitol increase tubular lumen osmotic pressure, increasing water and electrolyte excretion. Carbonic anhydrase inhibitors reduce bicarbonate reabsorption and sodium-hydrogen exchange. Thiazide diuretics inhibit sodium-chloride symporters in distal convoluted tubules. Loop diuretics inhibit sodium-potassium-chloride symporters in the thick ascending limb of Henle's loop. Potassium-sparing diuretics inhibit sodium channels or aldosterone receptors to retain potassium while excreting sodium.
This document provides information on loop diuretics and potassium sparing diuretics. It begins with an overview of normal urine formation and sites of renal reabsorption. It then classifies diuretics and discusses the mechanisms and sites of action of loop diuretics like furosemide and torsemide as well as potassium sparing diuretics like spironolactone and amiloride. It notes their therapeutic uses, interactions, and resistance. In recent years, new loop diuretic compounds like CRE 10904 have been developed.
1. Thiazide and loop diuretics act at different sites along the nephron to inhibit sodium reabsorption and cause increased sodium and water excretion.
2. They are used to treat edema, hypertension, and other conditions. Common side effects include hypokalemia, hypomagnesemia, and metabolic alterations.
3. The effects, pharmacokinetics, clinical uses and adverse effects of thiazide and loop diuretics are described and compared in detail. Combination diuretic therapy and managing diuretic resistance are also discussed.
Heart failure is a condition where the heart cannot pump enough blood to meet the body's needs. It has many potential causes, but is often due to problems with the heart muscle itself or valves. Treatment focuses on managing symptoms with diuretics, and slowing progression with ACE inhibitors, beta-blockers, and aldosterone antagonists. Other therapies aim to improve heart function or treat underlying causes. Prognosis depends on severity but ranges from 5-50% annual mortality.
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Edema is the abnormal accumulation of fluid in the interstitial spaces of tissues. It can occur locally or systemically. There are several mechanisms that can cause edema, including increased hydrostatic pressure, decreased plasma oncotic pressure, lymphatic obstruction, and sodium/water retention. Localized edema can be caused by inflammation, venous obstruction, or decreased plasma proteins. Systemic edema is often seen in conditions like congestive heart failure and nephrotic syndrome. Symptoms of edema include swelling, skin indentation, and weight gain.
The document provides information about renal pharmacology. It discusses the anatomy and physiology of the renal system and its purpose in eliminating waste and regulating fluids and electrolytes. It then summarizes different types of diuretic drugs, including loop diuretics like furosemide, thiazide diuretics like hydrochlorothiazide, and potassium-sparing diuretics like spironolactone. It describes the mechanisms of action, therapeutic uses, adverse effects, and interactions of these important classes of renal drugs.
Drugs used in urinary inconsistancy or scanty of urine, that promote urine formation and increases urine output are explained in the ppt by Dr. Mrunal Akre
Diuretics - Diuretics are chemical agents which increase the excretion of urine by kidneys. They lead to the secretion of excess water and that accumulate in tissues and urine, results in decrease in body fluids especially the extracellular fluid. The increased excretion of water and electrolytes by the kidneys is dependent in three different processes viz., glomerular filtration, tubular reabsorption active and passive and tubular secretion. Diuretics are classified in mainly three types: 1.High ceiling diuretics -Loop diuretics acts mainly at thick ascending limb of the loop of Henle. These diuretics produce peak diuresis which is much greater than other diuretics. Loop diuretics inhibit reabsorption of Na+, Cl- and K+ ions by inhibiting Na+/K+/2Cl- symport of the thick ascending limb of loop of Henle. By inhibiting Na+/K+/2Cl- symport, these agents also inhibit reabsorption of Ca++ and Mg++.
E.g. Furosemide , bumetanide, torasemide.
2. Medium efficacy diuretics-(a)Thiazide -Thiazide diuretics act on the early distal convoluted tubule and inhibit the sodium-chloride symporter leading to a retention of water in the urine, as water normally follows penetrating solutes. The short-term anti-hypertensive action is based on the fact that thiazides decrease preload, decreasing blood pressure. E.g. Chlorothiazide, Hydrochlorothiazide, Benzothiazide
(b)Thiazide like diuretics- These diuretics are behave like thiazide diuretics. E.g. Chlorthialidone, Indapamide, Xipamide, Metolazone ).
3. Weak diuretics-
(a)Carbonic anhydrase inhibitor- Carbonic anhydrase inhibitor acts on proximal convoluted tubule.
Carbonic anhydrase inhibitors are a medication used in the management and treatment of glaucoma, idiopathic intracranial hypertension, altitude sickness, congestive heart failure, and epilepsy, among other diseases.
E.g. acetazolamide
(b) Potassium sparing - These are diuretics which do not promote the secretion of potassium into the urine; thus, potassium is retained and not lost as much as with other diuretics. Potassium sparing diuretics act on cortical collecting tubule. These type of diuretics inhibit sodium reabsorption in late distal tubule and indirectly spare potassium excretion. E.g. Spironolactone, Eplerenone, Triamterene, Amiloride, (c)Osmotic -Osmotic diuretic is a type of diuretic that inhibits reabsorption of water and sodium (Na). They are pharmacologically inert substances that are given intravenously. They increase the osmolarity of blood and renal filtrate. In the nephron, osmotic diuretics act at the portions of the nephron that are water-permeable like proximal convoluted tubule, descending limb of loop of Henle, collecting tubuel.
E.g. Mannitol, Glycerol, Isosorbide).
Uses of diuretics - Acute pulmonary oedema,
Congestive cardiac failure,
Forced diuresis in barbiturate poisoning, Hypertension and CCF, Idiopathic hypercalciuria,
Nephrogenic diabetes incipidus, Certain kidney disorders, acute kidney failure.
Drugs Acting on Kidney, Prepared by Mriganka GiriMrigankaGiri
Drugs Acting on the Kidney
Definition, classification, pharmacological actions, dose,
indications, and contraindications of
1. Diuretics
2. Anti-Diuretics
The document discusses different classes of diuretic drugs, including loop diuretics, thiazide diuretics, potassium-sparing diuretics, carbonic anhydrase inhibitors, and osmotic diuretics. It provides details on the mechanisms of action, examples of drugs in each class, their uses, dosages, side effects and cautions. The document is intended as an educational reference on the types and clinical applications of various diuretic medications.
Diuretics are drugs that increase urine output. They are classified based on their site of action along the nephron. Common types include loop diuretics, thiazide diuretics, and potassium-sparing diuretics. Loop diuretics like furosemide act at the loop of Henle, thiazide diuretics block sodium reabsorption in the distal convoluted tubule, and potassium-sparing diuretics like amiloride inhibit sodium channels in the collecting duct. Diuretics are used to treat conditions involving fluid overload like heart failure and liver disease.
Diuretics are drugs that increase urine output by inhibiting reabsorption of sodium, chloride and water in the kidneys. There are several classes of diuretics including thiazide diuretics, loop diuretics, carbonic anhydrase inhibitors, and potassium-sparing diuretics. Thiazide diuretics such as chlorothiazide and hydrochlorothiazide act by inhibiting sodium reabsorption in the distal convoluted tubule. Loop diuretics like furosemide act in the loop of Henle and are the most potent class. Carbonic anhydrase inhibitors including acetazolamide inhibit bicarbonate reabsorption in the proximal tubule. Potassium-spar
This document provides information on diuretics, including what they are, the conditions they can treat, their mechanisms of action, and classifications. The main points are:
1. Diuretics promote urine production and can treat conditions like heart failure, kidney issues, hypertension, and liver cirrhosis. They work by either increasing glomerular filtration or decreasing tubular reabsorption of water and ions in the kidneys.
2. Diuretics can be classified as mercurial or non-mercurial. Common non-mercurial classes include thiazides, carbonic anhydrase inhibitors, and loop diuretics which act at different parts of the nephron.
3. Thiaz
This document provides an overview of diuretics, including their definition, classification, mechanisms of action, and side effects. It discusses the physiology of urine formation and the roles of the kidney in homeostasis. Specific sections cover thiazide diuretics, loop diuretics, their mechanisms in inhibiting sodium reabsorption in the distal tubule and thick ascending limb, respectively. Adverse effects include hypokalemia, hyperuricemia, and effects on calcium and magnesium levels. The document compares the potencies and durations of action of different diuretic classes and individual drugs.
Diuretics, also called water pills, are medications designed to increase the amount of water and salt expelled from the body as urine. There are three types of prescription diuretics. They’re often prescribed to help treat high blood pressure, but they’re used for other conditions as well.
This document provides information on drugs acting on the urinary system. It discusses different classes of diuretic drugs including high efficacy loop diuretics like furosemide, medium efficacy thiazide diuretics like hydrochlorothiazide, and weak adjunctive diuretics. Loop diuretics work by inhibiting sodium reabsorption in the ascending loop of Henle, thiazides inhibit sodium reabsorption in the distal convoluted tubule, and adjunctive diuretics utilize various mechanisms like inhibiting carbonic anhydrase or sodium channels. Common uses of diuretics include treating edema, hypertension, hypercalcemia, and increased intracranial pressure. Adverse effects can include electrolyte
This document discusses different types of diuretic drugs, how they work, and their uses. It covers high-ceiling loop diuretics which inhibit sodium reabsorption; thiazide diuretics which inhibit sodium transport in the distal convoluted tubule; carbonic anhydrase inhibitors which reduce hydrogen ion secretion; potassium-sparing diuretics which act in the cortical collecting duct; and osmotic diuretics like mannitol. Diuretics are used to treat conditions causing fluid retention like heart failure and liver disease. Side effects include electrolyte abnormalities and dehydration. Loop diuretics are commonly used for heart failure but may require intravenous administration for severe cases.
Diuretics work by increasing urine output and the excretion of electrolytes like sodium and chloride. They are classified as thiazide diuretics, loop diuretics, potassium-sparing diuretics, carbonic anhydrase inhibitors, and osmotic diuretics. Thiazide diuretics such as hydrochlorothiazide work by inhibiting sodium and chloride reabsorption in the distal convoluted tubule. Loop diuretics like furosemide inhibit sodium and chloride reabsorption in the thick ascending limb of the loop of Henle. Potassium-sparing diuretics prevent potassium loss by inhibiting sodium reabsorption in the collecting ducts. Carbonic anhydrase inhibitors
The document discusses different classes of diuretic drugs, including their mechanisms and effects. It describes loop diuretics like furosemide that inhibit sodium chloride reabsorption in the thick ascending limb of Henle's loop, increasing excretion of sodium and chloride in urine. It also discusses thiazide diuretics that act in the early distal tubule by inhibiting carbonic anhydrase and enhancing excretion of magnesium and potassium while inhibiting calcium and uric acid excretion. Finally, it mentions osmotic diuretics like mannitol that cause water retention in the proximal tubule through osmotic effects, resulting in water diuresis.
Mrs. VARSHA JAIN BA provides information on diuretics, including:
1. Diuretics work by interfering with transport mechanisms in the nephron to increase urine output and salt and water loss. The main classes are loop diuretics, thiazide diuretics, potassium-sparing diuretics, and osmotic diuretics.
2. Loop diuretics like furosemide act on the thick ascending limb of the loop of Henle. Thiazides like hydrochlorothiazide act in the distal convoluted tubule.
3. Potassium-sparing diuretics include aldosterone antagonists like spironolactone and epithelial
1. Diuretics are drugs that increase urine output by inhibiting tubular reabsorption of sodium and water in the kidneys. They are used to treat various types of edema and hypertension.
2. Diuretics can be classified based on their chemical structure and include xanthine, thiazide, loop, and potassium-sparing diuretics. Common loop diuretics are furosemide and bumetanide which have a rapid onset but short duration. Thiazide diuretics like hydrochlorothiazide have a longer duration.
3. Specific diuretics discussed include acetazolamide, furosemide, bumetanide, chlorthalidone
This document discusses the mechanism of action and classification of diuretic drugs. It begins by explaining the normal physiology of urine formation in the kidney and sites of tubular reabsorption. It then classifies diuretics based on potency and site of action. Loop diuretics such as furosemide are described as very potent diuretics that act in the thick ascending loop of Henle by inhibiting sodium-potassium-chloride reabsorption. Their pharmacological effects and mechanisms are explained in detail. Other loop diuretics including torsemide and bumetanide are also briefly discussed. The document concludes by noting some important drug interactions with loop diuretics.
Similar to Use of diuretics in congestive heart failure. pptx (20)
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
Does Over-Masturbation Contribute to Chronic Prostatitis.pptxwalterHu5
In some case, your chronic prostatitis may be related to over-masturbation. Generally, natural medicine Diuretic and Anti-inflammatory Pill can help mee get a cure.
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
- Video recording of this lecture in English language: https://youtu.be/kqbnxVAZs-0
- Video recording of this lecture in Arabic language: https://youtu.be/SINlygW1Mpc
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Basavarajeeyam is an important text for ayurvedic physician belonging to andhra pradehs. It is a popular compendium in various parts of our country as well as in andhra pradesh. The content of the text was presented in sanskrit and telugu language (Bilingual). One of the most famous book in ayurvedic pharmaceutics and therapeutics. This book contains 25 chapters called as prakaranas. Many rasaoushadis were explained, pioneer of dhatu druti, nadi pareeksha, mutra pareeksha etc. Belongs to the period of 15-16 century. New diseases like upadamsha, phiranga rogas are explained.
Osteoporosis - Definition , Evaluation and Management .pdfJim Jacob Roy
Osteoporosis is an increasing cause of morbidity among the elderly.
In this document , a brief outline of osteoporosis is given , including the risk factors of osteoporosis fractures , the indications for testing bone mineral density and the management of osteoporosis
These lecture slides, by Dr Sidra Arshad, offer a quick overview of the physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar lead (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
6. Describe the flow of current around the heart during the cardiac cycle
7. Discuss the placement and polarity of the leads of electrocardiograph
8. Describe the normal electrocardiograms recorded from the limb leads and explain the physiological basis of the different records that are obtained
9. Define mean electrical vector (axis) of the heart and give the normal range
10. Define the mean QRS vector
11. Describe the axes of leads (hexagonal reference system)
12. Comprehend the vectorial analysis of the normal ECG
13. Determine the mean electrical axis of the ventricular QRS and appreciate the mean axis deviation
14. Explain the concepts of current of injury, J point, and their significance
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. Chapter 3, Cardiology Explained, https://www.ncbi.nlm.nih.gov/books/NBK2214/
7. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Use of diuretics in congestive heart failure. pptx
1. USE OF DIURETICS IN CONGESTIVE
HEART FAILURE
Pharm. Jimmy Aiden
Pharmacy Department
Federal Teaching Hospital, Gombe
7th August, 2015
2. Table of Content
OVERVIEW OF CHF
Definition
Signs and Symptoms
Pathophysiology
Therapeutic objectives
Rationale for diuretics use in CHF
DIURETICS
Definition of class
Types
Mode of Actions
3. Table of content
Structural Activity Relationship
Indications
Pharmacokinetic profile
Dosage
Adverse effects
Interactions
DISCUSSION
CONCLUSION
CASE STUDY
5. Definition
Congestive Heart Failure is a complex clinical
syndrome that can result from any structural or
functional cardiac disorder that impairs the ability of
the ventricle to fill with or eject blood.
It may be graded as mild, moderate, or severe
depending upon whether symptoms such as dyspnea
and fatigue appear on ordinary physical exertion, on
little exertion, or at rest, respectively.
6. Definition
Another grading system (that of the New York Heart
Association) has four grades (grades I, II, III, IV), again
partly classified on appearance of symptoms in
relation to exertion (with grade IV representing the
most severe form).
10. Rationale for the use of
Diuretics in CHF
They provide very effective symptomatic control in
patients with peripheral or pulmonary oedema and
rapidly relieve dyspnoea.
12. Definition of class
A diuretic is any substance that promotes the
production of urine.
Technically, the term "diuresis" signifies an increase
in urine volume, while "natriuresis" denotes an
increase in renal sodium excretion. Because
natriuretic drugs almost always also increase water
excretion, they are usually called diuretics.
All diuretics increase the excretion of water from
bodies, although each class does so in a distinct way.
15. Mode of Actions
Thiazide & Thiazide-like diuretics
Inhibit Na+ reabsorption at
the distal convoluted tubule
by blocking the inhibit Na+
and Cl- transporter.
Increased K+/ Mg2+ excretion
And decreases Ca2+ excretion
16. Mode of Actions
Loop diuretics
Inhibits the Na+/K+/2Cl-
transporter at the ascending loop
of Henle; interfers with chloride
binding cotransport system,
causing increased excretion of
water, sodium, chlorine,
magnesium, and calcium.
They reduce lumen-positive
potential that comes from
K+ recycling.
17. Mode of Actions
Potassium-Sparing diuretics
Inhibition of Na+/K+
ATPase pump at the collecting
duct of the renal tubule.
Decreases Ca2+, Mg2+ and
H+ excretion
18. Structural Activity Relationship
Thiazides
1) The 2-position can tolerate small alkyl groups as CH3.
2) Substitutents in the 3-position determine
the potency and duration of action of the thiazides.
3) Saturation of C-N bond between the 3 and 4 positions of the
benzothiadiazine-1,1-dioxide nucleus increases the potency
of this class of diuretics approximately 3-10 fold.
4) Direct substitution of the 4-, 5-, or 8-position with an alkyl group
usually results in diminished diuretic activity,
5) Substitution of the 6-position with an activating group is essential
for diuretic activity. The best substituent include Cl-, Br-, CF3-, and
NO2- groups.
6) The sulfamoyl group in the 7-position is essential for diuretic
activity.
S
NH
NCl
H2NO2S
R
O
O 1
2
3
45
6
7
8
20. Structural Activity Relationship
Loop Diuretics
1) The substituent at the 1-position must be acidic, The carboxyl group
provides optimal diuretic activity, but other groups, as tetrazole, may have
respectable diuretic activity.
2) A sulfamoyl group in the 5-position is essential for optimal high-ceiling
diuretic activity.
3) The activating group (x-) in the 4-position can be Cl- or CF3-, a phenoxy-,
alkoxy-, anilino-, benzyl-, or benzoyl- group
H2NO2S
X
H
N
COOH
R
1
2
3
4
5
6 H2NO2S
X
COOH
N
R
5
4 3
2
1
6
22. • 2,4,7-Triamino-6-phenyl-pteridine
• Para-substitution of phenyl ring with (-OH group) increase
activity
• The phenyl group can be replaced by small heterocyclic rings
• The amino groups must be un-substituted.
• It has a structural similarity to folic acid and certain
dihydrofolate reductase inhibitors, but it has little, if any, of
their activities.
Structural Activity Relationship
Potassium Sparing
N
NN
N
H2N NH2
NH2
1
2
3
4
5
6
7
8
Triamterene
23. N
N
Cl
H2N
C
NH2
NH C
NH2
NH2
O
1
4
2
Cl-
+
35
6
- Over 25,000 agents were examined in an
Attempt to discover an antikaliuretic with no hormonal activity .
- Optimal diuretic activity is observed when
1- The 6 position is substituted with chlorine.
2- The amino group at 3 , 5 position are unsubstituted .
3- the guanidino nitrogen are not substituted with alkyl group .
Amiloride
Structural Activity Relationship
Potassium Sparing
25. Pharmacokinetic profile
Thiazides & Thiazide-like diuretics
Thiazides have onset of action of 1-2hrs and duration of action
of 12-18hrs.
Thiazides-like diuretics like metalozone has an onset of action
of 1-2hrs while its action last for a duration of 12-24hrs.
Effective in the treatment of sodium and water retention,
although there is generally a loss of action in renal failure
(GFR<25mL/min). Metolazone has an intense action when
added to a loop diuretic and is effective at low GFR.
26. Pharmacokinetic profile
Loop Diuretics
Oral: Onset of action 0.5-1hr,<1hr and Duration of action 4-
6hrs, <8hrs for Furosemide and Torsemide respectively.
Parenteral: Onset of action 5min, 10min and duration of
action is 2hrs and <8hrs for Furosemide and Torsemide
respectively.
Extensively bound to plasma proteins and are eliminated in
the urine by both glomerular filtration and tubular secretion.
Approximately a third of an administered dose is excreted by
the liver into the bile, from where it may be eliminated in the
feces. Only small amounts of these compounds appear to be
metabolized by the liver.
27. Pharmacokinetic profile
Potassium-Sparing Diuretics
Both triamterene and amiloride are effective after oral
administration. Diuresis ensues within 2 to 4 hours after
administration, although a maximum therapeutic effect may
not be seen for several days.
Both drugs cause a modest (2–3%) increase in Na and HCO3
excretion, a reduction in K and H loss, and a variable effect on
Cl elimination.
Approximately 80% of an administered dose of triamterene is
excreted in the urine as metabolites; amiloride is excreted
unchanged.
28. Dosages in CHF
Thiazide & Thiazide-like diuretics
Bendroflumethiazide: 5-10mg daily with a maintenance dose
of 2.5-10mg 1-3 times weelky
Hydrochlorothiazide: 25mg daily, increased to 50mg daily if
necessary. Elderly; 12.5mg daily
Metolazone: 5-10mg daily, 2.5mg daily when in combination
with loop diuretics. May be increased to 20mg/day based on
response and tolerance
29. Dosages in CHF
Loop diuretics
Furosemide, Oral: 40mg daily, maintenance dose of 20-40mg
daily, may be increased to 80mg daily or more in resistant
oedema. May also be increased by 20-40mg q6-8hrs; not to
exceed 600mg/day (Medscape). IV: 20-40mg, may be
increased by 20mg step q2hrs, not to exceed 200mg/dose.
Torsemide: Initially 10-20mg once daily, may be increased by
doubling dose until desired diuretic response is obtained.
Maximum daily dose is 200mg.
30. Dosages in CHF
Potassium-Sparing Diuretics
Amiloride: 10mg daily in 1 or 2 divided doses, adjusted
according to response to a maximum of 20mg daily when
used alone. 5mg daily increased to 10mg if necessary to a
maximum of 20mg daily when used in combination with
thiazide or loop diuretics.
Triamterene: Dyazide® (Triamterene 50mg + HCT 25mg) :
1 tab twice daily after meals, may be increased to 3 tabs daily.
Maintenance dose of 1 tab daily or 2 tabs on alternate days.
36. Diuretics Combinations
Loop Agents & Thiazides
Some patients are refractory to the usual dose of loop diuretics or
become refractory after an initial response . Since these agents have a
short half-life (2–6 hr.), refractoriness may be due to an excessive interval
between doses.
Loop agents and thiazides in combination often produce diuresis when
neither agent alone is effective.
Metolazone is the thiazide-like drug used in patients refractory to loop
agents alone
The combination of loop diuretics and thiazides can mobilize large
amounts of fluid, even in patients who have not responded to single
agents. Close hemodynamic monitoring is essential and outpatient use is
not recommended. K+-wasting is extremely common and may require
parenteral K+ administration with careful monitoring of fluid and
electrolyte status.
37. Diuretic Combinations
Potassium-Sparing & Loop Agents or Thiazides
Hypokalemia develops in many patients taking loop
diuretics or thiazides.
This can be managed by NaCl restriction or taking KCl
supplements.
If not treated, addition of a K+-sparing diuretic can
lower K+ excretion.
This should be avoided in renal insufficiency and in
those receiving angiotensin antagonists in whom life-
threatening hyperkalemia can develop.
38. Diuretics Resistance
The effectiveness of many diuretics ultimately depends on
establishing a negative Na+ balance to mobilize edema fluid,
restriction of dietary Na+ intake is generally an essential part
of diuretic therapy.
Therefore, one cause of therapeutic failure or apparent
patient refractoriness to diuretics could be the patient’s
continued ingestion of large quantities of NaCl
Many diuretics (e.g., thiazides and loop diuretics) must reach
the tubular lumen before they begin to be effective. Because
these compounds are organic acids and are bound to plasma
proteins, they reach the luminal fluid by secretion.
39. Diuretic Resistance
Any disease condition or drug that impairs secretion will
affect the access of the diuretics to the luminal fluid and
hence to their ultimate site of action.
.For example, renal dysfunction may lead to a buildup of
endogenous organic acids that decrease drug secretion and
thereby alter the patient’s expected response to the diuretic.
The concomitant administration of other drugs that are
substrates for the organic acid secretory system (e.g.,
probenecid or penicillin) may result in an apparent resistance
to diuretic action.
It should now be obvious that in addition to disease and
electrolyte imbalances, the pharmacodynamic handling of the
diuretics themselves may be a factor in diuretic resistance.
40. Conclusion
Diuretics have been the mainstay in the treatment of heart
failure, and continue to have an important role. They provide
very effective symptomatic control in patients with peripheral
or pulmonary oedema and rapidly relieve dyspnoea. If
symptoms of fluid retention are only mild, a thiazide diuretic,
such as bendroflumethiazide or hydrochlorothiazide, may be
adequate. However, in most cases, especially in moderate or
severe fluid retention, a loop diuretic such as furosemide will
be necessary.
Reduction in fluid intake (<2000mL in 24hrs) may be
necessary for CHF patients who experienced recurrent fluid
retention despite sodium restriction and use of diuretics.
41. Conclusion
Edema associated with heart failure is generally managed with loop
diuretics. In some instances, salt and water retention may become
so severe that a combination of thiazides and loop diuretics is
necessary.
In treating the heart failure patient with diuretics, it must always be
remembered that cardiac output in these patients is being
maintained in part by high filling pressures. Therefore, excessive
use of diuretics may diminish venous return and further impair
cardiac output. This is especially critical in right ventricular heart
failure.
Loop diuretics are the most efficacious diuretics because:
– large NaCl absorptive capacity of Thick ascending loop of henle
– the diuretic action of these drugs is not limited by acidosis
42. References
Goodman and Gilman’s Manual of Pharmacology and Therapeutics 2008
Hunt SA et al. ACC/AAAHA guidelines for the evaluation and management
of CHF in the adult: Executive summary: A report of the American College
of Cardiology/American Heart Association Task Force on Practice
Guidelines. Circulation 2001;104:2996–3007
Bleich M and Greger R. Mechanism of action of diuretics. Kidney Int
1997;51:S11–S15.
Brater DC. The use of diuretics in congestive heart failure. Semin Nephrol
1994;14:479–482.
Brater DC. Pharmacology of diuretics. Am J Med Sci 2000;319:38–50.
Ellison DH. Diuretic drugs and the treatment of edema: From clinic to
bench and back again. Am J Kidney Dis 1994;23:623–643.
Suki WN. Use of diuretics in chronic renal failure. Kidney Int 1997;51:S33–
S35.
44. Case study
A 60 year-old woman with a history of HTN and MI was admitted
to the hospital with complaints of dyspnea and increased pitting
oedema of the lower extremities. She admitted to not adhering
to her sodium-restricted diet for several weeks and that her
weight has recently increased from her usual 55kg to 68kg. At
the time of her last physician visit, her serum sodium level was
135mEq/L and serum creatinine was 1.3mg/dL. Laboratory
results present on admission included hyponatremia (Na
128mEq/L), elevated blood urea nitrogen (BUN 75mg/dL), and
an elevated serum creatinine level (2.0mg/dL). She was
diagnosed with CHF secondary to HTN and MI. The patient was
managed with Tabs Furosemide 40mg daily, Tabs Lisinopril 5mg
daily, and Tabs Hydrochlorothiazide 25mg daily.
45. Case study
Commentary
Fluid volume overload was evidenced by pitting oedema, an
acute weight gain and dyspnea. Both the fluid volume excess
and the hyponatremia were due to the patient’s worsening CHF.
The increased BUN(N: 6-23mg/dL) and creatinine levels (N:0.6-
1.5mg/dL) reflected a reduced GFR secondary to a decreased
cardiac output. The symptoms that caused the patient to seek
medical attention were dyspnea and oedema, both of which
were associated with worsening cardiac failure. Water intake
should be restricted until the serum sodium level normalized.
Discharge instruction should include information about her new
medications and the need to adhere to her sodium-restricted
diet.
One cannot discuss the management of heart failure without including comments about the kidney. The relationship between the heart and the kidney makes intuitive sense when one considers the importance of the kidney in maintaining an appropriate volume status throughout the body.