The kidney plays an important role in drug excretion and metabolism. Renal diseases and impairment can significantly impact the pharmacokinetics of drugs in multiple ways. Kidney function affects absorption, distribution, metabolism and elimination of drugs. Specifically, impaired renal function can decrease drug protein binding, increase volume of distribution, decrease metabolism of some drugs while increasing metabolism of others, and greatly reduce drug clearance by eliminating the kidney's excretory pathway. These alterations in pharmacokinetics require careful dosage adjustments for many drugs used in patients with renal diseases.
dosage adjustment in renal and hepatic failure for medical studentDeepaJoshi41
This document discusses dosage adjustment for patients with renal and hepatic failure. It covers the basics of kidney and liver function, causes of failure, and methods for assessing renal and hepatic function. For renal failure, dosage is adjusted based on drug clearance and markers like inulin, creatinine, and blood urea nitrogen are used to assess kidney function. For hepatic failure, dosage depends on the drug's metabolism in the liver and is adjusted if metabolism is reduced. Liver function tests and markers like aminotransferases, alkaline phosphatase, bilirubin, and prothrombin time help evaluate liver function.
Pharmacokinetics variations in Disease States.Faizan Akram
The biggest issue in PK/PD and drug therapy is variability in
response. Variability factors that affect pharmacokinetics and pharmacodynamics influence clinical trials and dose regimen designs.
This document discusses pharmacokinetic drug-drug interactions, which occur when one drug alters the absorption, distribution, metabolism, or excretion of another drug. It provides examples of how drugs can impact gastric pH and absorption, plasma protein binding and distribution, cytochrome P450 enzyme inhibition and induction impacting metabolism, and effects on renal drug excretion and blood flow. Factors like disease states, age, gender, and genetics can also influence a person's drug metabolism and susceptibility to these pharmacokinetic drug interactions.
Pharmacokinetic changes in renal impairment and dosage considerationsDr Htet
The kidneys play a key role in drug elimination from the body. Renal impairment can affect the pharmacokinetics of many drugs by reducing their excretion, increasing their bioavailability and toxicity. Dosage regimens must be adapted based on a patient's level of renal function and whether the drug or its metabolites are renally excreted. Drugs that are nephrotoxic or have a narrow therapeutic index require especially close monitoring and dosage adjustment according to glomerular filtration rate in patients with renal impairment.
In this presentation i have tried to thoroughly discuss about the concept of Drug induced kidney disease or injury, the mechanism behind it, its classification and how to access it.
Pharmacokinetic changes of drugs in hepatic diseasesDr Htet
1) The pharmacokinetics of many drugs are altered in patients with hepatic disease depending on the drug's elimination pathway and the severity of liver dysfunction.
2) For drugs that are highly extracted by the liver during first pass metabolism, hepatic impairment can increase their oral bioavailability by reducing first pass extraction.
3) Liver diseases may also decrease plasma protein binding of drugs and increase their free fractions, potentially leading to adverse effects from higher than intended drug levels.
This document discusses hepatic clearance and elimination. It begins by explaining that liver function tests can help estimate hepatic clearance by detecting hepatic dysfunction. It then covers topics like the classification of liver function tests, hepatic clearance definition and calculation, biliary excretion of drugs and enterohepatic recycling, and hepatic elimination. The overall purpose is to explain how the liver clears and eliminates drugs from the body.
dosage adjustment in renal and hepatic failure for medical studentDeepaJoshi41
This document discusses dosage adjustment for patients with renal and hepatic failure. It covers the basics of kidney and liver function, causes of failure, and methods for assessing renal and hepatic function. For renal failure, dosage is adjusted based on drug clearance and markers like inulin, creatinine, and blood urea nitrogen are used to assess kidney function. For hepatic failure, dosage depends on the drug's metabolism in the liver and is adjusted if metabolism is reduced. Liver function tests and markers like aminotransferases, alkaline phosphatase, bilirubin, and prothrombin time help evaluate liver function.
Pharmacokinetics variations in Disease States.Faizan Akram
The biggest issue in PK/PD and drug therapy is variability in
response. Variability factors that affect pharmacokinetics and pharmacodynamics influence clinical trials and dose regimen designs.
This document discusses pharmacokinetic drug-drug interactions, which occur when one drug alters the absorption, distribution, metabolism, or excretion of another drug. It provides examples of how drugs can impact gastric pH and absorption, plasma protein binding and distribution, cytochrome P450 enzyme inhibition and induction impacting metabolism, and effects on renal drug excretion and blood flow. Factors like disease states, age, gender, and genetics can also influence a person's drug metabolism and susceptibility to these pharmacokinetic drug interactions.
Pharmacokinetic changes in renal impairment and dosage considerationsDr Htet
The kidneys play a key role in drug elimination from the body. Renal impairment can affect the pharmacokinetics of many drugs by reducing their excretion, increasing their bioavailability and toxicity. Dosage regimens must be adapted based on a patient's level of renal function and whether the drug or its metabolites are renally excreted. Drugs that are nephrotoxic or have a narrow therapeutic index require especially close monitoring and dosage adjustment according to glomerular filtration rate in patients with renal impairment.
In this presentation i have tried to thoroughly discuss about the concept of Drug induced kidney disease or injury, the mechanism behind it, its classification and how to access it.
Pharmacokinetic changes of drugs in hepatic diseasesDr Htet
1) The pharmacokinetics of many drugs are altered in patients with hepatic disease depending on the drug's elimination pathway and the severity of liver dysfunction.
2) For drugs that are highly extracted by the liver during first pass metabolism, hepatic impairment can increase their oral bioavailability by reducing first pass extraction.
3) Liver diseases may also decrease plasma protein binding of drugs and increase their free fractions, potentially leading to adverse effects from higher than intended drug levels.
This document discusses hepatic clearance and elimination. It begins by explaining that liver function tests can help estimate hepatic clearance by detecting hepatic dysfunction. It then covers topics like the classification of liver function tests, hepatic clearance definition and calculation, biliary excretion of drugs and enterohepatic recycling, and hepatic elimination. The overall purpose is to explain how the liver clears and eliminates drugs from the body.
Here are the key steps to solve this problem:
1) Calculate the elimination rate constant (k) using the two measured concentrations and times:
k = (lnC1 - lnC2) / (t1 - t2)
= (ln5.5 - ln6.5) / (8 - 24) hrs
= -0.05 hr-1
2) Calculate the volume of distribution (Vd) using the infusion rate (I), k, and the first measured concentration:
Vd = I / (k * C1)
= 15 mg/hr / (0.05 hr-1 * 5.5 mg/L)
= 15 L
3
The document discusses renal failure and chronic kidney disease (CKD). It defines acute and chronic renal failure and how they are diagnosed using estimated glomerular filtration rate (eGFR) and urine albumin-creatinine ratio (ACR). CKD is diagnosed if abnormalities are present for over 3 months. The document outlines management of CKD including treatment of complications like anemia, electrolyte imbalances, mineral metabolism abnormalities, and medication dosing considerations. It emphasizes regularly monitoring kidney function and adjusting medications according to glomerular filtration rate.
This document discusses dosing of drugs in patients with liver failure. It begins by introducing how the liver is involved in drug metabolism and clearance. It then classifies drugs based on their hepatic extraction: high extraction (flow limited), low extraction (enzyme limited), and intermediate extraction drugs. For each class, it discusses how liver disease impacts drug clearance and provides recommendations for dose adjustments based on the severity of liver impairment.
This document discusses drug dosing considerations in renal failure. It notes that dosage refers to the prescribed administration of a drug over time, while dose refers to a single amount. Patients with renal disease are more vulnerable to drug effects, which may increase or decrease. Assessment of renal function includes serum creatinine and BUN levels. Estimating glomerular filtration rate (eGFR) accounts for average body size. Many drugs require dosage adjustments or alternative choices in renal failure, especially those excreted renally. Loading doses do not typically change, while maintenance doses depend on drug clearance. Some antibiotics do not require adjustment.
Therapeutic drug monitoring for immunosuppressive agents ( organ transplants)pavithra vinayak
Therapeutic drug monitoring (TDM) is used to measure drug concentrations in body fluids to aid in managing drug therapy for diseases. TDM is integral for immunosuppressive drugs used after organ transplants as they have a narrow therapeutic index and concentrations vary between individuals. Common immunosuppressive drugs monitored include cyclosporine, tacrolimus, sirolimus, and mycophenolic acid. Monitoring is important as supratherapeutic and subtherapeutic concentrations of these drugs can have serious negative health outcomes for transplant recipients. Factors like metabolism, drug interactions, and individual pharmacokinetics require close monitoring to optimize efficacy and safety.
The document discusses pharmacokinetics in special populations including pregnancy, the elderly, and pediatrics. During pregnancy, there are expanded blood volume, increased kidney function and liver metabolism, and decreased stomach movement. In the elderly, there are decreased liver function and ability to recover from injury, as well as reduced kidney function and breathing capacity. In children, absorption is affected by developing digestive systems with immature organs and patterns compared to adults.
35 effects of renal disease on pharmacokineticsDang Thanh Tuan
This document discusses the effects of renal disease on pharmacokinetics. It covers how renal disease impacts drug elimination through the kidneys, drug metabolism in the liver, and drug distribution. Key points include that renal drug clearance declines with impaired kidney function, which can impact drug dosing. Protein binding changes can also affect drug levels as kidney function declines.
This PPT is about P38 signaling pathway. It includes the introduction of p38, mechanisms of p38 MAPK activation, signaling pathway, physiological functions, and related disease.
Digestive diseases include conditions of the esophagus, stomach, duodenum, jejunum, ileum, large intestine, and rectum. Gastritis is inflammation of the stomach that can be caused by Helicobacter pylori bacteria, autoimmune processes, nonsteroidal anti-inflammatory drugs, alcohol, or unknown reasons. Peptic ulcer disease affects one in eight Americans and is mainly caused by H. pylori infection or nonsteroidal anti-inflammatory drugs, which damage the stomach lining and allow acid to cause ulcers.
The kidney plays an important role in regulating fluids, electrolytes, and removing waste from the body. Impairment of kidney function affects drug pharmacokinetics. Common causes of kidney failure include disease, injury, drug toxicity, infections, diabetes, toxins, and reduced blood flow. Acute kidney problems or trauma can lead to uremia where filtration is impaired, causing excess fluid and waste to accumulate. Uremic patients may have changes in drug absorption, distribution, and clearance. Dosage adjustments are often needed based on a patient's kidney function and drug properties to safely treat uremic patients.
The document discusses drug elimination and kinetics. It covers:
- Drug elimination occurs through metabolism and excretion.
- Drugs can be eliminated through first or zero-order kinetics. Most drugs follow first-order kinetics where a constant fraction is eliminated per unit time.
- Drugs are mainly eliminated through the kidneys and liver, with other routes including the lungs, bile, sweat and milk.
- Key processes for renal elimination include glomerular filtration, tubular secretion and reabsorption. pH changes can impact drug ionization and reabsorption.
- The half-life of a drug describes the time for its concentration to reduce by half and impacts dosing adjustments. Drug accumulation can occur if
Angina is a symptom of coronary artery disease that occurs when the heart muscle does not get enough oxygen-rich blood. It is usually felt as chest pain or discomfort when one engages in physical exertion or is exposed to stress. There are two main types - stable angina, which occurs predictably in relation to activity or stress, and unstable angina, which occurs unpredictably even at rest. Diagnosis involves electrocardiograms, stress tests, and coronary angiography to detect blockages in the arteries. Treatment focuses on lifestyle changes, medications to manage risk factors and symptoms, and procedures like angioplasty or bypass surgery in severe cases.
This session will help pharmacists enhance their expertise in managing patients with hypertension through updates on the latest hypertension guidelines, discussion on the role that pharmacists can and should play in the detection and ongoing management of hypertension and hands-on experience with blood pressure measurement devices.
This document discusses different types of drug interactions, including pharmacokinetic, pharmacodynamic, and pharmaceutical interactions. Pharmacokinetic interactions involve effects on the absorption, distribution, metabolism and excretion of drugs. Pharmacodynamic interactions involve effects of drugs on receptors and include agonism, antagonism, addition, synergism and potentiation. Pharmaceutical interactions refer to incompatible drugs that cannot be administered together intravenously. Drug interactions can increase the risk of adverse drug reactions and should be considered when multiple drugs are prescribed.
Drug distibution, significance, steps in Drug distribution, Factors affecting,physiochemical properties of drug, volume of distribution,protein binding, mechanism of protein drug binding
This document discusses therapeutic drug monitoring (TDM) of drugs used to treat cardiovascular diseases. It focuses on digoxin, which is commonly used to treat congestive heart failure. The document provides details on digoxin's pharmacokinetic parameters, indications, therapeutic range, toxicity, and interactions with other medications. It emphasizes the importance of TDM for digoxin to ensure therapeutic levels are achieved and toxicity is avoided, especially when other medications are involved due to the risk of interactions.
Therapeutic drug monitoring (TDM) involves measuring the plasma concentration of a drug to guide dosing for individual patients. TDM is primarily used for drugs with a narrow therapeutic index or steep dose-response curves to maximize efficacy and minimize toxicity. Common drugs monitored include digoxin, lithium, theophylline, phenytoin, and gentamicin. TDM helps optimize dosing, identifies non-compliance or toxicity, and facilitates dose adjustments based on concentration levels.
Renal impairment affects drug pharmacokinetics by impairing kidney function and drug excretion. Common causes of kidney failure include hypertension, diabetes, nephrotoxic drugs, and hypovolemia. Dosage adjustment in renal impairment depends on glomerular filtration rate and serum creatinine concentration, which are used to estimate renal function and classify impairment severity. Drugs eliminated renally require lower doses as impairment increases. Dosage regimens may be adjusted by lowering the dose, extending the dosing interval, or both, to achieve the desired drug concentration based on a patient's renal function.
ROLE OF PHARMACIST IN MANAGEMENT OF KIDNEY STONES FROM RECURRENT UTINikhila Yaladanda
This document discusses the role of pharmacists in managing recurrent urinary tract infections (UTIs) that can lead to kidney stones. It outlines the causes, risk factors, and types of kidney stones. It then presents a case study of a 20-year-old female patient who experienced recurring UTIs and developed a kidney stone due to lack of pharmacist counseling on medication adherence and lifestyle changes. The document emphasizes the importance of pharmacist education to prevent reoccurrence of UTIs and kidney stones through non-pharmacological measures like diet, exercise and ensuring patients understand appropriate medication use.
Here are the key steps to solve this problem:
1) Calculate the elimination rate constant (k) using the two measured concentrations and times:
k = (lnC1 - lnC2) / (t1 - t2)
= (ln5.5 - ln6.5) / (8 - 24) hrs
= -0.05 hr-1
2) Calculate the volume of distribution (Vd) using the infusion rate (I), k, and the first measured concentration:
Vd = I / (k * C1)
= 15 mg/hr / (0.05 hr-1 * 5.5 mg/L)
= 15 L
3
The document discusses renal failure and chronic kidney disease (CKD). It defines acute and chronic renal failure and how they are diagnosed using estimated glomerular filtration rate (eGFR) and urine albumin-creatinine ratio (ACR). CKD is diagnosed if abnormalities are present for over 3 months. The document outlines management of CKD including treatment of complications like anemia, electrolyte imbalances, mineral metabolism abnormalities, and medication dosing considerations. It emphasizes regularly monitoring kidney function and adjusting medications according to glomerular filtration rate.
This document discusses dosing of drugs in patients with liver failure. It begins by introducing how the liver is involved in drug metabolism and clearance. It then classifies drugs based on their hepatic extraction: high extraction (flow limited), low extraction (enzyme limited), and intermediate extraction drugs. For each class, it discusses how liver disease impacts drug clearance and provides recommendations for dose adjustments based on the severity of liver impairment.
This document discusses drug dosing considerations in renal failure. It notes that dosage refers to the prescribed administration of a drug over time, while dose refers to a single amount. Patients with renal disease are more vulnerable to drug effects, which may increase or decrease. Assessment of renal function includes serum creatinine and BUN levels. Estimating glomerular filtration rate (eGFR) accounts for average body size. Many drugs require dosage adjustments or alternative choices in renal failure, especially those excreted renally. Loading doses do not typically change, while maintenance doses depend on drug clearance. Some antibiotics do not require adjustment.
Therapeutic drug monitoring for immunosuppressive agents ( organ transplants)pavithra vinayak
Therapeutic drug monitoring (TDM) is used to measure drug concentrations in body fluids to aid in managing drug therapy for diseases. TDM is integral for immunosuppressive drugs used after organ transplants as they have a narrow therapeutic index and concentrations vary between individuals. Common immunosuppressive drugs monitored include cyclosporine, tacrolimus, sirolimus, and mycophenolic acid. Monitoring is important as supratherapeutic and subtherapeutic concentrations of these drugs can have serious negative health outcomes for transplant recipients. Factors like metabolism, drug interactions, and individual pharmacokinetics require close monitoring to optimize efficacy and safety.
The document discusses pharmacokinetics in special populations including pregnancy, the elderly, and pediatrics. During pregnancy, there are expanded blood volume, increased kidney function and liver metabolism, and decreased stomach movement. In the elderly, there are decreased liver function and ability to recover from injury, as well as reduced kidney function and breathing capacity. In children, absorption is affected by developing digestive systems with immature organs and patterns compared to adults.
35 effects of renal disease on pharmacokineticsDang Thanh Tuan
This document discusses the effects of renal disease on pharmacokinetics. It covers how renal disease impacts drug elimination through the kidneys, drug metabolism in the liver, and drug distribution. Key points include that renal drug clearance declines with impaired kidney function, which can impact drug dosing. Protein binding changes can also affect drug levels as kidney function declines.
This PPT is about P38 signaling pathway. It includes the introduction of p38, mechanisms of p38 MAPK activation, signaling pathway, physiological functions, and related disease.
Digestive diseases include conditions of the esophagus, stomach, duodenum, jejunum, ileum, large intestine, and rectum. Gastritis is inflammation of the stomach that can be caused by Helicobacter pylori bacteria, autoimmune processes, nonsteroidal anti-inflammatory drugs, alcohol, or unknown reasons. Peptic ulcer disease affects one in eight Americans and is mainly caused by H. pylori infection or nonsteroidal anti-inflammatory drugs, which damage the stomach lining and allow acid to cause ulcers.
The kidney plays an important role in regulating fluids, electrolytes, and removing waste from the body. Impairment of kidney function affects drug pharmacokinetics. Common causes of kidney failure include disease, injury, drug toxicity, infections, diabetes, toxins, and reduced blood flow. Acute kidney problems or trauma can lead to uremia where filtration is impaired, causing excess fluid and waste to accumulate. Uremic patients may have changes in drug absorption, distribution, and clearance. Dosage adjustments are often needed based on a patient's kidney function and drug properties to safely treat uremic patients.
The document discusses drug elimination and kinetics. It covers:
- Drug elimination occurs through metabolism and excretion.
- Drugs can be eliminated through first or zero-order kinetics. Most drugs follow first-order kinetics where a constant fraction is eliminated per unit time.
- Drugs are mainly eliminated through the kidneys and liver, with other routes including the lungs, bile, sweat and milk.
- Key processes for renal elimination include glomerular filtration, tubular secretion and reabsorption. pH changes can impact drug ionization and reabsorption.
- The half-life of a drug describes the time for its concentration to reduce by half and impacts dosing adjustments. Drug accumulation can occur if
Angina is a symptom of coronary artery disease that occurs when the heart muscle does not get enough oxygen-rich blood. It is usually felt as chest pain or discomfort when one engages in physical exertion or is exposed to stress. There are two main types - stable angina, which occurs predictably in relation to activity or stress, and unstable angina, which occurs unpredictably even at rest. Diagnosis involves electrocardiograms, stress tests, and coronary angiography to detect blockages in the arteries. Treatment focuses on lifestyle changes, medications to manage risk factors and symptoms, and procedures like angioplasty or bypass surgery in severe cases.
This session will help pharmacists enhance their expertise in managing patients with hypertension through updates on the latest hypertension guidelines, discussion on the role that pharmacists can and should play in the detection and ongoing management of hypertension and hands-on experience with blood pressure measurement devices.
This document discusses different types of drug interactions, including pharmacokinetic, pharmacodynamic, and pharmaceutical interactions. Pharmacokinetic interactions involve effects on the absorption, distribution, metabolism and excretion of drugs. Pharmacodynamic interactions involve effects of drugs on receptors and include agonism, antagonism, addition, synergism and potentiation. Pharmaceutical interactions refer to incompatible drugs that cannot be administered together intravenously. Drug interactions can increase the risk of adverse drug reactions and should be considered when multiple drugs are prescribed.
Drug distibution, significance, steps in Drug distribution, Factors affecting,physiochemical properties of drug, volume of distribution,protein binding, mechanism of protein drug binding
This document discusses therapeutic drug monitoring (TDM) of drugs used to treat cardiovascular diseases. It focuses on digoxin, which is commonly used to treat congestive heart failure. The document provides details on digoxin's pharmacokinetic parameters, indications, therapeutic range, toxicity, and interactions with other medications. It emphasizes the importance of TDM for digoxin to ensure therapeutic levels are achieved and toxicity is avoided, especially when other medications are involved due to the risk of interactions.
Therapeutic drug monitoring (TDM) involves measuring the plasma concentration of a drug to guide dosing for individual patients. TDM is primarily used for drugs with a narrow therapeutic index or steep dose-response curves to maximize efficacy and minimize toxicity. Common drugs monitored include digoxin, lithium, theophylline, phenytoin, and gentamicin. TDM helps optimize dosing, identifies non-compliance or toxicity, and facilitates dose adjustments based on concentration levels.
Renal impairment affects drug pharmacokinetics by impairing kidney function and drug excretion. Common causes of kidney failure include hypertension, diabetes, nephrotoxic drugs, and hypovolemia. Dosage adjustment in renal impairment depends on glomerular filtration rate and serum creatinine concentration, which are used to estimate renal function and classify impairment severity. Drugs eliminated renally require lower doses as impairment increases. Dosage regimens may be adjusted by lowering the dose, extending the dosing interval, or both, to achieve the desired drug concentration based on a patient's renal function.
ROLE OF PHARMACIST IN MANAGEMENT OF KIDNEY STONES FROM RECURRENT UTINikhila Yaladanda
This document discusses the role of pharmacists in managing recurrent urinary tract infections (UTIs) that can lead to kidney stones. It outlines the causes, risk factors, and types of kidney stones. It then presents a case study of a 20-year-old female patient who experienced recurring UTIs and developed a kidney stone due to lack of pharmacist counseling on medication adherence and lifestyle changes. The document emphasizes the importance of pharmacist education to prevent reoccurrence of UTIs and kidney stones through non-pharmacological measures like diet, exercise and ensuring patients understand appropriate medication use.
The document discusses drugs and their effects on the kidney. It covers normal kidney function, estimation of renal function, loop and thiazide diuretics, nephrotoxic drugs such as NSAIDs and aminoglycosides, and prescribing considerations in kidney disease. The ALLHAT trial found thiazide-type diuretics were superior to other antihypertensives in preventing cardiovascular disease due to their lower cost and greater efficacy.
Drug use in hepatic and renal impairmentAkshil Mehta
- Drugs are more likely to accumulate and cause toxicity in patients with impaired liver or kidney function due to reduced drug metabolism and excretion. The pharmacokinetics of many drugs are altered in patients with hepatic or renal impairment.
- In liver disease, drug absorption, metabolism, protein binding, and elimination can all be affected. Dosage reductions are often required for drugs that are metabolized by the liver. Hepatotoxic drugs should be avoided when possible.
- In kidney disease, drug absorption and excretion may be altered. Drugs that are weak acids or bases can be "trapped" in the urine through changes in urine pH. Dosage adjustments are often needed for drugs excreted by
This document discusses cardiorenal syndrome (CRS), defined as when acute or chronic dysfunction of the heart or kidneys induces dysfunction of the other organ. It describes 5 types of CRS based on whether cardiac or renal dysfunction occurs acutely or chronically. Type 1 involves acute cardiac failure worsening renal function, while Type 2 involves chronic congestive heart failure causing chronic renal dysfunction. Biomarkers like NGAL can aid early diagnosis of CRS Type 1. Management involves diuretics, inotropes, vasodilators, and blocking the renin-angiotensin-aldosterone system with ACE inhibitors or ARBs.
Anemia Indian scenario In Chronic Kidney Disease Patients Dr Ashutosh Ojha
this is a comprehensive presentation in Post Doctoral Certificate in Nephrology training program. At Gauhati Medical College Hospital ,Dept Of Nephrology.
Factors affecting biotransformation of drugsZubia Arshad
The biotransformation of drugs can be affected by various chemical, biological, physiological, temporal, and environmental factors. Chemical factors include enzyme induction and inhibition, which can increase or decrease the metabolism of drugs. Biological factors like age, gender, genetics, diet, and disease states can impact drug metabolism rates. Physiological changes during pregnancy, with hormonal imbalances, or disease states can also alter drug biotransformation. Additional influencing factors are temporal variations, the route of drug administration, and environmental exposures. Careful consideration of all these potential factors is important for safe and effective drug therapy.
This document provides guidelines for managing anemia in chronic kidney disease patients at General University Teaching Hospital of Slemani. It outlines the historical background of understanding renal anemia and effects of anemia like increased mortality and cardiovascular disease. The guidelines recommend targets for hemoglobin concentration, iron status markers, and schedules for parenteral iron and erythropoiesis-stimulating agent administration and monitoring based on hemoglobin levels and dialysis status. Potential complications and contraindications of treatments are also discussed.
The document discusses obstructive uropathy and benign prostatic hyperplasia (BPH). It defines obstructive uropathy as structural or functional hindrance of normal urine flow. The most common causes of obstruction vary with age, from valves/strictures in children to BPH/prostate cancer in older adults. BPH is a non-cancerous enlargement of the prostate and its symptoms are related to bladder outlet obstruction. Treatment involves eliminating the obstruction either temporarily with stents/tubes or permanently with surgery or procedures like resection or ablation.
This document discusses hematuria (blood in the urine) and obstructive uropathy (blockage of urine flow in the urinary tract). It covers evaluating hematuria through urinalysis, imaging tests, and cystoscopy. Common causes of hematuria include infections, stones, tumors, and glomerulonephritis. Obstructive uropathy can be congenital or acquired and cause changes to the urethra, bladder, ureters, and kidneys over time. Relieving the obstruction through surgery, stents, or nephrostomy is the main treatment approach.
This document discusses nephrotoxic drugs and their impact on kidney function. It begins by explaining how renal damage from drugs can cause significant health issues like acute kidney injury and chronic kidney disease, as well as increasing medical costs. It then identifies several common classes of drugs that can cause nephrotoxicity, such as antibiotics, chemotherapy agents, antihypertensives, and NSAIDs. The document discusses mechanisms of nephrotoxicity for different drug classes and regions of the kidney. It also examines renal biomarkers that can help identify kidney injury earlier than serum creatinine. Finally, it provides examples of renal protective strategies like dose adjustments, monitoring, and hydration that can reduce the nephrotoxic risks of certain
Anemia is a common complication of chronic kidney disease that can cause fatigue. While the kidneys normally produce erythropoietin to stimulate red blood cell production, CKD patients have relative erythropoietin deficiency. This leads to anemia which, if left untreated, can negatively impact quality of life and cardiovascular health. Erythropoiesis-stimulating agents and iron supplementation are used to treat anemia in CKD, though the appropriate hemoglobin target level remains an area of ongoing research and debate given risks identified with higher targets in some studies.
This presentation provides an overview of kidney stones, including their incidence, types, causes, symptoms, diagnosis, and treatment. Kidney stones, also called renal calculi, form when substances in urine crystallize and harden. The most common types are calcium and uric acid stones. Risk factors include dehydration and family history. Symptoms include flank pain and blood in the urine. Diagnosis involves tests of urine and imaging of the kidneys. Treatment focuses on pain relief, increasing fluid intake, and sometimes surgical procedures to break up or remove stones.
The document discusses the kidneys and their functions, as well as common kidney diseases and treatments for kidney failure. The kidneys filter waste from the blood and produce hormones. When the kidneys fail, waste builds up and dialysis or transplantation is needed. Common causes of kidney failure include diabetes, high blood pressure, glomerulonephritis, polycystic kidney disease and long term painkiller use. Dialysis options include hemodialysis and peritoneal dialysis, while transplantation provides the best outcomes.
Cardiotoxicity refers to heart damage caused by certain chemotherapy drugs, heavy metals, and other toxins. Three main mechanisms of cardiotoxicity are discussed: interfering with aerobic metabolism in the heart, altering myocardial conduction, and directly damaging heart muscle cells. Symptoms of cardiotoxicity include fatigue, shortness of breath, and swelling. Diagnosis involves physical exams, imaging tests like echocardiograms and MUGA scans, and blood tests. Prevention strategies center around modifying drug treatment plans, using protective medications like dexrazoxane, and controlling risk factors after treatment through medications like ACE inhibitors and beta-blockers.
Drugs pharmacology in Liver disease discusses how impaired liver function affects drug metabolism and elimination in different ways depending on the extent of liver damage. For drugs highly extracted by the liver during a single pass, impaired liver function increases bioavailability but may prolong half-life only in severe cases. For drugs with low hepatic extraction, impaired liver function prolongs half-life more significantly. It also discusses changes to absorption, metabolism, protein binding, and considerations for specific drug classes. Laboratory tests of liver function are important but may not reflect hepatic drug clearance capacity.
This document discusses various aspects of pharmacology related to drug use in kidney disease. It covers topics like how weak acids and bases are affected by pH and excreted by the kidneys, how drug metabolism and protein binding may be altered in renal impairment, how to assess renal function using creatinine and calculate drug dosing based on clearance, and how the kidneys normally excrete and metabolize drugs as well as how renal impairment can affect these processes. It also discusses direct drug-induced kidney injuries and considerations for prescribing drugs in patients with renal disease.
Variations in Pk's in disease states.pptxSARADPAWAR1
Also the degree of plasma-protein binding, in turn, influences the distribution, action, metabolism and renal excretion of drugs. Thus changes in plasma protein binding of drugs, e.g. in diseased states, may give rise to altered pharmacokinetic and possibly altered drug response.
Variations in Pk's in disease states.pdfSARADPAWAR1
Also the degree of plasma-protein binding, in turn, influences the distribution, action, metabolism and renal excretion of drugs. Thus changes in plasma protein binding of drugs, e.g. in diseased states, may give rise to altered pharmacokinetic and possibly altered drug response.
Variations in Pk's in disease states.pdfSARADPAWAR1
Pharmacokinetic variation is when there is variability in the drug concentration at the effector site after administration of a standard dose. This can result in one dose of a drug being ineffective in one patient, but potentially toxic with unwanted side effects in another.
Thyroid disease and renal disease can influence drug metabolism in several ways. Thyroid dysfunction can cause changes in drug metabolism ranging from profound to moderate or negligible, depending on the drug. Renal impairment requires dosage reductions for drugs that are primarily cleared renally. Liver diseases like cirrhosis, jaundice, alcoholic liver disease, viral hepatitis, and hepatoma can also impact drug metabolism through various mechanisms such as decreasing drug clearance or inhibiting metabolic enzyme pathways. The effects are complex and unpredictable, varying with the type and severity of the disease.
Hepatic disease can significantly alter the pharmacokinetics and pharmacodynamics of drugs due to changes in drug metabolism, transport, and clearance in the liver. The degree of liver impairment is assessed using tests like the Child-Pugh score, with higher scores indicating more severe impairment. Drugs eliminated primarily by the liver or highly bound to albumin are more likely to require dosage adjustments in patients with hepatic disease due to potential changes in metabolism, protein binding, and clearance. The fraction of the drug metabolized and properties of its active metabolites also influence whether dosage adjustment is necessary.
Hepatic disease can significantly alter the pharmacokinetics and pharmacodynamics of drugs due to changes in drug metabolism and clearance in the liver. The degree of liver function impairment is commonly assessed using the Child-Pugh score, with higher scores indicating more severe impairment. For drugs that undergo significant hepatic metabolism or clearance, dosage reductions may be necessary in patients with liver disease to avoid drug accumulation, decreased formation of active metabolites, and increased risk of adverse effects. The need for dosage adjustment depends on the fraction of the drug metabolized by the liver and the severity of liver function impairment.
Handling of drugs in Renal Failure (kinetics and dynamics) Bilal AL-mosheqh
The kidneys play an important role in drug disposition and it is important to design specific drug regimens for patients with renal impairment. Renal failure can alter a drug's pharmacokinetics through changes in absorption, protein binding, volume of distribution and elimination. It can also impact a drug's pharmacodynamics by increasing sensitivity to certain drugs. Dose modification is crucial when treating patients with renal failure due to these alterations in pharmacokinetics and pharmacodynamics.
The document discusses various routes of drug excretion from the body. It describes renal excretion through glomerular filtration and tubular secretion/reabsorption in the kidneys. It also discusses non-renal routes of excretion including biliary excretion through the liver, pulmonary excretion through the lungs, and other minor routes like salivary, mammary, dermal, and gastrointestinal excretion. Key factors that influence the different excretion pathways include a drug's physicochemical properties, binding characteristics, urine and bile pH, and physiological conditions.
This document discusses how various diseases can affect drug pharmacokinetics and metabolism. It covers effects of gastrointestinal, cardiac, renal, liver and thyroid disorders. Key points include:
- Renal and liver diseases can significantly impact drug absorption, distribution, metabolism and excretion. Dose adjustments are often needed.
- Cardiac failure can alter drug distribution and decrease elimination due to reduced hepatic and renal perfusion.
- Monitoring drug levels can help optimize therapy for individual patients, especially when inter-individual variability is high or clinical effects are difficult to assess. Close monitoring of response is important when prescribing for patients with organ dysfunction.
Pharmacotherapy considerations in elderly adultsSafaa Ali
Pharmacotherapy considerations in elderly adults focuses on how aging affects the body's processing of drugs. Key changes include reduced absorption in the gastrointestinal tract, altered distribution in tissues due to changes in body composition, and decreased metabolism and excretion due to reduced liver and kidney function. These pharmacokinetic changes mean drugs for elderly patients often require dosage adjustments to avoid adverse drug reactions. Common issues include increased risk of drug interactions due to slower drug clearance and greater sensitivity to pharmacodynamic effects like sedation or hypotension.
The document discusses the effect of hepatic (liver) disease on drug pharmacokinetics. Hepatic diseases can alter how drugs are metabolized, distributed, and eliminated from the body. This can lead to drug accumulation, changes in active metabolites formed, and altered protein binding. Several factors are relevant when considering drug dosing in patients with hepatic impairment, including changes in enzyme activity and blood flow. Tests are used to assess liver function and severity of disease, but do not fully capture changes to drug metabolism. Drugs may require dose adjustments in patients with hepatic impairment depending on the fraction of the drug metabolized by the liver.
This document discusses how drugs are eliminated by the kidneys and the mechanisms of renal injury caused by various drugs. It notes that many drugs can injure the kidneys through a few common mechanisms, such as altering renal blood flow or causing direct tubular toxicity. It provides examples of specific drugs that can cause these types of renal injuries. The document also discusses factors that influence drug dosing in patients with renal impairment and principles for safely prescribing drugs in such patients.
This document discusses how pharmacokinetics are altered in patients with impaired kidney function or uremia. It notes that drug absorption from the GI tract, distribution in the body, metabolism, and excretion can all be impacted. Specifically, it states that bioavailability may increase due to changes in GI motility and blood flow, while distribution can change with fluid status alterations. Metabolism and excretion are also reduced due to impaired kidney function. As a result, drug levels in the bloodstream may increase, potentially causing toxicity issues. The document emphasizes that dosing guidelines must account for a patient's remaining renal function and clearance.
This document provides information on renal excretion of drugs. It discusses how the kidney is the primary route of elimination for water soluble, non-volatile and small molecule drugs. The basic functional unit of the kidney is the nephron, which filters drugs from the blood and reabsorbs or secretes them via processes like glomerular filtration, tubular secretion and reabsorption. Factors that influence renal excretion include the physicochemical properties of drugs as well as physiological and pathological factors. Renal impairment decreases drug clearance leading to prolonged drug exposure. Methods to assess renal function and adjust drug dosing based on renal function are also described.
- 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
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Cell Therapy Expansion and Challenges in Autoimmune DiseaseHealth Advances
There is increasing confidence that cell therapies will soon play a role in the treatment of autoimmune disorders, but the extent of this impact remains to be seen. Early readouts on autologous CAR-Ts in lupus are encouraging, but manufacturing and cost limitations are likely to restrict access to highly refractory patients. Allogeneic CAR-Ts have the potential to broaden access to earlier lines of treatment due to their inherent cost benefits, however they will need to demonstrate comparable or improved efficacy to established modalities.
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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.
ABDOMINAL TRAUMA in pediatrics part one.drhasanrajab
Abdominal trauma in pediatrics refers to injuries or damage to the abdominal organs in children. It can occur due to various causes such as falls, motor vehicle accidents, sports-related injuries, and physical abuse. Children are more vulnerable to abdominal trauma due to their unique anatomical and physiological characteristics. Signs and symptoms include abdominal pain, tenderness, distension, vomiting, and signs of shock. Diagnosis involves physical examination, imaging studies, and laboratory tests. Management depends on the severity and may involve conservative treatment or surgical intervention. Prevention is crucial in reducing the incidence of abdominal trauma in children.
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Overall life span (LS) was 1671.7±1721.6 days and cumulative 5YS reached 62.4%, 10 years – 50.4%, 20 years – 44.6%. 94 LCP lived more than 5 years without cancer (LS=2958.6±1723.6 days), 22 – more than 10 years (LS=5571±1841.8 days). 67 LCP died because of LC (LS=471.9±344 days). AT significantly improved 5YS (68% vs. 53.7%) (P=0.028 by log-rank test). Cox modeling displayed that 5YS of LCP significantly depended on: N0-N12, T3-4, blood cell circuit, cell ratio factors (ratio between cancer cells-CC and blood cells subpopulations), LC cell dynamics, recalcification time, heparin tolerance, prothrombin index, protein, AT, procedure type (P=0.000-0.031). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and N0-12 (rank=1), thrombocytes/CC (rank=2), segmented neutrophils/CC (3), eosinophils/CC (4), erythrocytes/CC (5), healthy cells/CC (6), lymphocytes/CC (7), stick neutrophils/CC (8), leucocytes/CC (9), monocytes/CC (10). Correct prediction of 5YS was 100% by neural networks computing (error=0.000; area under ROC curve=1.0).
2. The kidney is an important bean shaped
organ in regulating body fluids, removal of
metabolic waste, electrolyte balance and
drug excretion from body located at the
rear of the abdominal cavity in
the retroperitoneal space, the kidneys
receive blood from the paired renal
arteries, and drain into the paired renal
veins. Each kidney excretes urine into
a ureter which empties into the bladder.
3. Common clinical conditions involving
the kidney include the nephritic and
nephrotic syndromes,
renal cysts, acute kidney injury,
chronic kidney disease,
urinary tract infection,
nephrolithiasis, and
urinary tract obstruction.
4. Impairment of kidney function effects
pharmacokinetics of drugs.Some of the
common causes for kidney failure include
disease, injury, and drug intoxication.
Impaired renal function will result in
increased bioavailablity of drugs exhibiting
first-pass metabolism when the function of
drug metabolizing enzyme is compromised.
The kidneys can excrete only water-soluble
substances.One function of metabolism is
to convert fat soluble drugs into water-
soluble metabolites.
5. Weak acids and weak bases gain or lose
protons depending on the pH. Their
movement between aqueous & lipid mediums
varies with the pH.
Weak acids are excreted faster in alkaline
urine and vice versa.
The sodium bicarbonate alkalinizes the urine,
raising the number of barbiturate ions in the
renal filtrate. The ionized particles cannot
pass easily through renal tubular membranes.
Therefore, less drug is reabsorbed into the
blood and more is excreted by the kidneys.
6. EFFECT OF RENAL DISEASES ON DRUG
DISTRIBUTION:
Impaired renal function is associated with
important changes in the binding of drugs
to plasma proteins. The reduced binding
occurs, when renal function is impaired, for
the following reason
Reduction in serum albumin concentration.
Structural changes in binding sites.
Displacement of drug from albumin binding
sites by organic molecules that
accumulates in uremia.
7. The volume of distribution of a drug can
decrease if compounds normally excreted by
the kidney accumulates to the extent that
displacement of drug from tissue binding
sites occur.
Distribution of drugs is altered by changes in
ECF, plasma protein binding, and tissue
binding.
Water-soluble drugs are distributed in ECF,
including edema fluid, which is increased in
renal impairment.
8. Plasma protein binding of acidic drugs:
Reidenberg and Drayer have stated that
protein binding in serum from uremic patients
is decreased for every acidic drug that has
been studied. Most acidic drugs bind to the
bilirubin binding site on albumin but there are
also different binding sites that play a role.
One consequence of reduced protein binding
is that the distribution volume elemination
clearance of these drugs is increased.
For example, digoxin can be displaced from
tissue by metabolic products that cannot be
excreted by impaired kidneys.
9. Albumin is the main drug-binding plasma protein for
acidic drugs. Drug binding with albumin is decreased with
renal impairment. This is due to decreased albumin or
reduced binding capacity.
Reasons for decreased albumin include:
Nephrotic states in which albumin is lost in the urine.
Hypermetabolic states (stress, trauma, sepsis) in which
protein breakdown exceeds protein synthesis.
Liver disease that decreases hepatic synthesis of
albumin.
Reasons for reduced binding capacity include:
Uremic toxins that compete with drugs for binding sites.
Structural changes in the albumin molecule.
10. Odar-Cederlof and Borga studied phenytoin
to illustrate some of the changes in drug
distribution and elimination that occur in
patients with impaired renal function. In
patients with normal renal function, 92% of
the phenytoin in plasma is protein bound.
However, the percentage that is unbound
or “free” rises from 8% in these individuals
to 16%, or more, in hemodialysis-
dependent patients.
The three-fold increase in hepatic
clearance that was observed in uremic
patients was primarily the result of
decreased phenytoin binding to plasma
proteins.
11. Plasma protein binding of basic and
neutral drugs:
The protein binding of basic drugs tends to
be normal or only slightly reduced.In some
cases, this may reflect the facts that these
drugs bind to alpha1–acid glycoprotein and
that concentrations of this glycoprotein are
higher in hemodialysis-dependent patients
than in patients with normal renal function.
For basic drugs (clindamycin, propafenone),
larger amounts of a basic drug is bound and
a smaller amount is free to exert an effect.
12. Tissue binding of drugs:
The distribution volume of some drugs also
can be altered when renal function is
impaired. Sheiner et al have shown that
impaired renal function is associated with
a decrease in digoxin Vd (L/kg). This
presumably reflects a reduction in tissue
levels of Na/K -ATPase, an enzyme
represents a major tissue-binding site for
digoxin.
13. Effect on Absorption:
Absorption of oral drugs may be decreased
indirectly in renal failure by delayed gastric
emptying, changes in gastric pH, GI symptoms
such as vomiting and diarrhea, edema of the
GI tract (in the presence of generalized
edema).
In CRF, gastric pH is altered by Oral
alkalinizing agents (sodium bicarbonate,
citrate). This causes decrease in absorption
of oral drugs that require an acidic
environment for absorption. Increases
absorption of drugs that are absorbed from a
more alkaline environment.
14. The absorption of D –xylose is less complete
(48.6% vs. 69.4%) in patients with chronic
renal failure than in normal subjects.This
primary absorptive defect may explain the
fact that patients with impaired renal
function have reduced bioavailability of
furosemide and pindolol.
However, it also is possible that impaired
renal function will result in increased
bioavailability of drugs exhibiting first pass
metabolism when the function of drug
metabolizing enzymes is compromised.
15. Drug absorption and bioavailability, these
shortcomings can be overcome by
conducting a single study in which an
intravenous formulation of the stable isotope
labeled drug is administered simultaneously
with the oral drug dose.
This technique was used to study a 64-year-
old man with a creatinine clearance of 79
ml/min who was started on N-
acetylprocainamide (NAPA) therapy for
ventricular arrhythmias .
The oral NAPA dose was 66% absorbed in this
patient, compared to 91.6% ± 9.2% when this
method was used to assess NAPA absorption
in normal subjects.
16. Effect on Metabolism:
Metabolism can increase, decrease, or does
not change by renal impairment.
One factor is alteration of drug metabolism in
the liver. In uremia, reduction and hydrolysis is
slower, but oxidation by CYP enzymes and
conjugation reactions proceed at normal rates.
Another factor is the inability of impaired
kidneys to eliminate drugs and active
metabolites.Metabolites may have
pharmacologic activity similar to or different
from that of the parent drug.
17. A third factor is impaired renal metabolism
of drugs. The kidney contains many of the
same metabolizing enzymes found in the
liver.
For example it has renal CYP enzymes,
which metabolize some chemicals and
drugs. Most drugs are not excreted by the
kidneys unchanged but are first
biotransformed to metabolites that are then
excreted.
Renal failure not only may retard the
excretion of these metabolites, which in
some cases have important pharmacologic
activity, but, in some cases, alters the
metabolic clearance of drugs.
18. Effect of Renal diseases on Drug
Metabolism:
I. OXIDATIONS : NORMAL OR INCREASED
EXAMPLE: PHENYTOIN
II. REDUCTIONS: SLOWED
EXAMPLE: HYDROCORTISONE
III. HYDROLYSES
• PLASMA ESTERASE: SLOWED
EXAMPLE: PROCAINE
• PLASMA PEPTIDASE: NORMAL
EXAMPLE: ANGIOTENSIN
• TISSUE PEPTIDASE: SLOWED
EXAMPLE: INSULIN
19. IV. SYNTHESES
• GLUCURONIDE FORMATION : NORMAL
EXAMPLE: HYDROCORTISONE
• ACETYLATION: SLOWED
EXAMPLE: PROCAINAMIDE
• GLYCINE CONJUGATION: SLOWED
EXAMPLE: PAS
• O-METHYLATION : NORMAL
EXAMPLE: METHYLDOPA
• SULFATE CONJUGATION: NORMAL
EXAMPLE: METHYLDOPA
Clinical experience suggests that creatinine clearance
must fall below 25 ml/min before the acetylation rate of
procainamide is impaired.
20. Effect on Elimination:
Excretion of many drugs is reduced in renal failure. The
kidneys normally excrete both the parent drug and
metabolites produced by the liver. Renal excretion
includes: glomerular filtration, tubular secretion, and
tubular reabsorption all of which is affected by renal
impairment. An adequate fluid intake is required to excrete
drugs by the kidneys.Any factor that depletes ECF
increases the risk of worsening renal impairment which
include:
Inadequate fluid intake
Diuretic drugs
Loss of body fluids (bleeding, vomiting, diarrhea)
21. In the kidneys of elderly, blood flow, GFR, and tubular
secretion of drugs is decreased. All of these changes slow
excretion and promote accumulation of drugs in the
body.Impaired kidney function greatly increases the risks of
adverse drug effects. For many drugs, CLE actually consists of
additive renal (CLR) and non renal (CL NR) components, as
indicated by the following equation:
CLE = CLR + CLNR
Non-renal clearance is usually equated with drug metabolism,
but also could include hemodialysis and other methods of drug
removal.
22. Generally one should consider a possible,
modest decrease in drug doses when
creatinine clearance is <50-60ml/min.
A moderate decrease in drug doses when
creatinine clearance is <25-30ml/min.
A substantial decrease in drug doses when
creatinine clearance is <15ml/min.
LMW Heparin excreted by kidney if
eGFR<30ml/min lengthens elimination half
life causing drug accumulation thus
increased risk of bleeding not easily
reversed so need dose adjustments.
23. Use dosage adjustments in one of following ways:
Divide the dose you determined for normal renal function by
the dosage adjustment factor and continue with the same
dosage interval. (Dosage adjustment factor is the ratio of the
half life of the drug in the patient to the half life of the drug in
the normal person)
Continue with the same dose but multiply the dosage interval
you determined for normal renal function by the dosage
adjustment factor.
A regimen combined dose reduction and dose interval
prolongation may maintain a more uniform serum
concentration.
24. IMPORTANT MECHANISMS OF RENAL ELIMINATION OF
DRUGS
GLOMERULAR FILTRATION:
• AFFECTS ALL DRUGS & METABOLITES OF APPROPRIATE
MOLECULAR SIZE
• INFLUENCED BY PROTEIN BINDING (f = FREE FRACTION)
DRUG FILTRATION RATE = GFR x f x [DRUG]
RENAL TUBULAR SECRETION:
• NOT INFLUENCED BY PROTEIN BINDING
• MAY BE AFFECTED BY COMPETITION WITH OTHER DRUGS,
ETC.
EXAMPLES: ACTIVE DRUGS: ACIDS – PENICILLIN ,
BASES – PROCAINEAMIDE
METABOLITES: GLUCURONIDES, HIPPURATES, ETC.
25. REABSORPTION BY NON-IONIC DIFFUSION
• AFFECTS WEAK ACIDS & WEAK BASES
• ONLY IMPORTANT IF EXCRETION OF FREE DRUG IS
MAJOR ELIMINATION PATH
EXAMPLES: WEAK ACIDS: PHENOBARBITAL ,
WEAK BASES: QUINIDINE
ACTIVE REABSORPTION
• AFFECTS IONS, NOT PROVED FOR OTHER DRUGS
EXAMPLES: HALIDES: FLUORIDE, BROMIDE
ALKALINE EARTH METALS: LITHI
26. Reidenberg et al. have shown that renal secretion of
some basic drugs declines with aging more rapidly than
GFR. Also studies with N-1-methylnicotinamide, an
endogenous marker of renal tubular secretion, have
demonstrated some degree of glomerulo-tubular
imbalance in patients with impaired renal function.
Despite the paucity of detailed studies, it is possible to
draw some general conclusions from renal clearance
values:
• If renal clearance exceeds drug filtration rate , there is
net renal tubular secretion of the drug.
• If renal clearance is less than drug filtration rate, there
is net renal tubular reabsorption of the drug.
27. Adjustment and Guidelines:
Therapy must be individualized according to the extent
of renal impairment. This is determined by measuring
creatinine, which is used to calculate creatinine
clearance as a measure of the GFR. Creatinine is
determined by muscle mass and the GFR, so its
measurement cannot be used as the sole indicator of
renal function.
Serum creatinine is a relatively unreliable indicator of
renal function in elderly clients. Because they have
diminished muscle mass, they may have a normal
creatinine even if their GFR is markedly reduced.
28. drugs (cimetidine and trimethoprim) increase creatinine and
create a false impression of renal failure. They interfere with
secretion of creatinine into kidney tubules.
Some drugs are excreted exclusively by the kidneys
(aminoglycosides, lithium).
Some drugs are contraindicated in renal impairment
(tetracyclines except doxycycline).
Drugs can be used if safety guidelines are followed (reducing
dosage, using TDM and renal function tests, avoiding
dehydration).
Drugs known to be nephrotoxic should be avoided when
possible. In some instances, however, there are no effective
substitutes and nephrotoxic drugs must be given.
Some commonly used nephrotoxic drugs include
aminoglycoside antibiotics, amphotericin B, and cisplatin.
29. Aspirin is nephrotoxic in high doses, and protein binding of
aspirin is reduced in renal failure so that blood levels of active
drug are higher.
NSAIDs can decrease blood flow in the kidneys by inhibiting
synthesis of prostaglandins that dilate renal blood vessels.
When renal blood flow is normal, these prostaglandins have
limited activity.
When renal blood flow is decreased, their synthesis is
increased to protect the kidneys from ischemia. In those who
depend on PGs to maintain renal blood flow, NSAIDs result in
decreased GFR, and retention of salt and water. NSAIDs can
also cause kidney damage by a hypersensitivity reaction that
leads to ARF.
30. Lithium is not metabolized by the body. It is entirely
excreted by the kidneys and has a very narrow
therapeutic range.
Adequate renal function is required for lithium therapy.
If it has to be given in renal impairment, the dose must
be reduced and TDM must be done.
80% of a lithium dose is reabsorbed in the proximal
renal tubules. The amount of reabsorption depends on
the concentration of sodium in the proximal tubules.
A deficiency of sodium causes more lithium to be
reabsorbed => risk of lithium toxicity ↑.Excessive
sodium intake lowers lithium levels to non therapeutic
ranges.
31. Conclusions:
Prescribing in CKD is an ART.
No substitute for knowing the drug Pharmacology and
the individual patient.
Individualize “Go Low/Go Slow” is a good general rule.
Review medicine list including otc supplements at each
visit.
Watch for nephrotoxins.