A brief overview of defibrillator,its physical principles, types, its indications & contraindications and maintenance policy.this powerpoint is primarily intended for anaesthesiologists and other health care providers working in critical care centres.
Defibrillators are devices that deliver an electrical shock to the heart to terminate life-threatening cardiac arrhythmias like ventricular fibrillation. They were first demonstrated on dogs in 1899 and first used on a human in 1947. There are several types including manual external defibrillators, automated external defibrillators (AEDs) found in public places, implantable cardioverter-defibrillators, and wearable defibrillators. AEDs can analyze the heart rhythm and instruct the user, who needs no training, on whether a shock is needed. Defibrillation aims to stop all cardiac electrical activity so the heart's natural pacemaker can resume normal rhythm, while cardioversion delivers synchronized shocks
Defibrillators are devices that deliver electric shocks to the heart to restore normal heart rhythm and prevent cardiac arrest. They can be external and operated manually, external and automated for public use, or internal and implanted. External defibrillators use adhesive electrode pads or paddles placed on the patient's chest to deliver shocks. Internal defibrillators have electrodes implanted directly on the heart. The electric shock depolarizes heart muscle cells to terminate arrhythmias so the natural pacemaker can restore normal rhythm. Proper placement of defibrillator electrodes is important for effectiveness of treatment.
A defibrillator is a device that delivers an electric shock to the heart to stop ventricular fibrillation or atrial fibrillation, which are abnormal heart rhythms. Ventricular fibrillation occurs when the heart's lower chambers quiver instead of pumping blood, which can be fatal if not treated within minutes by delivering a shock via a defibrillator to reset the heart's rhythm. Defibrillators can be external or internal, and use electric shocks of varying voltages and durations depending on the type and location of use to convert the heart rhythm back to normal.
Defibrillators are electronic devices that deliver an electric shock to the heart to stop an irregular heartbeat and restore a normal rhythm. There are two main types - internal defibrillators with electrodes implanted in the heart, and external defibrillators used on the chest wall. Automated external defibrillators (AEDs) are designed for public use and guide laypeople to deliver shocks safely. Defibrillation is an important treatment for life-threatening cardiac arrhythmias like ventricular fibrillation.
Dr. Dharmendra Joshi provides an overview of defibrillation and cardioversion. Some key points include:
- Defibrillation involves delivering unsynchronized energy during any cardiac cycle phase to terminate arrhythmias like ventricular fibrillation. Cardioversion delivers synchronized energy to large QRS complexes.
- Biphasic waveforms are now preferred over monophasic as they provide effective defibrillation at lower energies, reducing risk of injury.
- Safety is paramount, with operators announcing charges and discharges to avoid contact with patient or equipment. Complications can include arrhythmias, burns, embolism and myocardial necrosis. Troubleshooting focuses on proper equipment connection and settings.
Pacemaker powerpoint presentation med surgNehaNupur8
pacemaker - artificial pump to the heart, this contained definition, components,working, types, indication, methods of pacaing, temporary and permanent pacemaker, signs of failure of pacemaker , medical and nursing management of patient with pacemaker.
The document discusses defibrillation and cardioversion. Defibrillation delivers energy without synchronization to the cardiac cycle, while cardioversion delivers synchronized energy. Both terminate abnormal rhythms and allow normal sinus rhythm to resume. Defibrillation is indicated for pulseless ventricular tachycardia and ventricular fibrillation, while cardioversion is used for supraventricular tachycardia, atrial fibrillation, and atrial flutter. Biphasic shocks are now preferred over monophasic shocks as they are more effective at lower energy levels.
A brief overview of defibrillator,its physical principles, types, its indications & contraindications and maintenance policy.this powerpoint is primarily intended for anaesthesiologists and other health care providers working in critical care centres.
Defibrillators are devices that deliver an electrical shock to the heart to terminate life-threatening cardiac arrhythmias like ventricular fibrillation. They were first demonstrated on dogs in 1899 and first used on a human in 1947. There are several types including manual external defibrillators, automated external defibrillators (AEDs) found in public places, implantable cardioverter-defibrillators, and wearable defibrillators. AEDs can analyze the heart rhythm and instruct the user, who needs no training, on whether a shock is needed. Defibrillation aims to stop all cardiac electrical activity so the heart's natural pacemaker can resume normal rhythm, while cardioversion delivers synchronized shocks
Defibrillators are devices that deliver electric shocks to the heart to restore normal heart rhythm and prevent cardiac arrest. They can be external and operated manually, external and automated for public use, or internal and implanted. External defibrillators use adhesive electrode pads or paddles placed on the patient's chest to deliver shocks. Internal defibrillators have electrodes implanted directly on the heart. The electric shock depolarizes heart muscle cells to terminate arrhythmias so the natural pacemaker can restore normal rhythm. Proper placement of defibrillator electrodes is important for effectiveness of treatment.
A defibrillator is a device that delivers an electric shock to the heart to stop ventricular fibrillation or atrial fibrillation, which are abnormal heart rhythms. Ventricular fibrillation occurs when the heart's lower chambers quiver instead of pumping blood, which can be fatal if not treated within minutes by delivering a shock via a defibrillator to reset the heart's rhythm. Defibrillators can be external or internal, and use electric shocks of varying voltages and durations depending on the type and location of use to convert the heart rhythm back to normal.
Defibrillators are electronic devices that deliver an electric shock to the heart to stop an irregular heartbeat and restore a normal rhythm. There are two main types - internal defibrillators with electrodes implanted in the heart, and external defibrillators used on the chest wall. Automated external defibrillators (AEDs) are designed for public use and guide laypeople to deliver shocks safely. Defibrillation is an important treatment for life-threatening cardiac arrhythmias like ventricular fibrillation.
Dr. Dharmendra Joshi provides an overview of defibrillation and cardioversion. Some key points include:
- Defibrillation involves delivering unsynchronized energy during any cardiac cycle phase to terminate arrhythmias like ventricular fibrillation. Cardioversion delivers synchronized energy to large QRS complexes.
- Biphasic waveforms are now preferred over monophasic as they provide effective defibrillation at lower energies, reducing risk of injury.
- Safety is paramount, with operators announcing charges and discharges to avoid contact with patient or equipment. Complications can include arrhythmias, burns, embolism and myocardial necrosis. Troubleshooting focuses on proper equipment connection and settings.
Pacemaker powerpoint presentation med surgNehaNupur8
pacemaker - artificial pump to the heart, this contained definition, components,working, types, indication, methods of pacaing, temporary and permanent pacemaker, signs of failure of pacemaker , medical and nursing management of patient with pacemaker.
The document discusses defibrillation and cardioversion. Defibrillation delivers energy without synchronization to the cardiac cycle, while cardioversion delivers synchronized energy. Both terminate abnormal rhythms and allow normal sinus rhythm to resume. Defibrillation is indicated for pulseless ventricular tachycardia and ventricular fibrillation, while cardioversion is used for supraventricular tachycardia, atrial fibrillation, and atrial flutter. Biphasic shocks are now preferred over monophasic shocks as they are more effective at lower energy levels.
This document discusses defibrillation and cardioversion. It defines defibrillation as treatment for life-threatening arrhythmias without a pulse using electrical shock, while cardioversion aims to convert arrhythmias to normal rhythm with or without a pulse. Both use electrical energy to allow normal sinus rhythm. Defibrillation is for immediate use in ventricular fibrillation or pulseless ventricular tachycardia, while cardioversion may be used for unstable or failed chemical cardioversion of atrial fibrillation, atrial flutter, ventricular tachycardia with a pulse. The document reviews the history of defibrillation and types of defibrillators, and provides guidance on defibrillation and cardioversion procedures and considerations.
This document discusses defibrillation, which is a treatment used to restore normal heart rhythm in patients experiencing ventricular fibrillation or pulseless ventricular tachycardia. It defines defibrillation and describes the different types of defibrillators, including manual external defibrillators, automated external defibrillators, implantable cardioverter defibrillators, and wearable cardiac defibrillators. It also covers how defibrillation works, the precautions that must be taken with the procedure, and the risks involved.
A pacemaker is an electronic device that provides electrical stimulation to the heart muscle. Pacemakers were first developed in the 1950s and have since become implantable devices used to treat conditions like sinus node dysfunction and heart block. There are permanent and temporary pacemakers that can be single chamber, dual chamber, or multisite devices. Pacemakers are implanted surgically and connected to the heart with leads to provide pacing in the appropriate chambers. Nursing care involves preoperative teaching, postoperative monitoring for complications, assessing pacemaker function, and educating patients.
this is dealt about the pacemaker temporary and permanent its aim and basic indication for pacemaker breif history of pacemaker development its design and detailed indication of both temporary and permanent pacemaker then method of pacing which should be based on the patient ECG its parts and procedure and complication
A complete Theoretical as well as practical aspects of Cardiac defibrillation with the definition,history,defibrillator and cardiovesrsion,Equipments,pre procedural consideration,care of patient before and after defibrillation,cardiac defibrillation procedure steps with rationale,complications,documentation and legal aspects
A pacemaker is an electronic device that is used to pace the heart when the normal conduction pathway is damaged or diseased. It has three main components: a pulse generator, pacing leads, and healthy myocardium. A pacemaker has three main functions - pacing, sensing, and capture. There are two main types - permanent pacemakers, which are implanted inside the body, and temporary pacemakers, which have an external power source. Pacemakers can operate in either a fixed rate mode, firing constantly, or a demand mode, firing only when the heart rate drops below a preset level. Nursing care for a patient with a pacemaker involves monitoring the heart rate and rhythm, vital signs, bleeding, and infection risk, as
Defibrillator power point presentation for medical studentsNehaNupur8
The document discusses defibrillators, which are medical devices used to deliver electric shocks to the heart to correct irregular heart rhythms like ventricular fibrillation. It defines different types of defibrillators, including manual external defibrillators, automated external defibrillators (AEDs), implantable cardioverter defibrillators, and wearable cardiac defibrillators. The document also outlines the procedures for using defibrillators, important nursing considerations, post-defibrillation care, and precautions.
Defibrillation is a treatment for cardiac arrest that uses electric shocks to restore a normal heart rhythm. It has evolved significantly since its first use on humans in 1947. Key developments include pre-hospital defibrillation by paramedics in the 1960s-70s and the introduction of automated external defibrillators (AEDs) for public use. Defibrillation works by depolarizing the heart and interrupting abnormal rhythms, allowing the heart's natural pacemaker to resume control. It is most effective for shockable rhythms like ventricular fibrillation when administered quickly after cardiac arrest. Modern defibrillators use biphasic waveforms that deliver lower peak currents, reducing risk of injury compared to older
Defibrillation is a process that delivers an electric shock to stop an irregular heartbeat and restore normal rhythm. Early defibrillation within the first few minutes of cardiac arrest is crucial for survival. Pioneers like Claude Beck developed the defibrillator and helped revive heart attack victims. Proper defibrillator use requires correct pad placement and force, as well as ensuring safety from fires and electrical hazards. The delivery of the shock must be coordinated to avoid potential dangers and maximize effectiveness.
Defibrillators are devices used to treat life-threatening cardiac arrhythmias through electric shocks. There are several types of defibrillators including those for defibrillation, cardioversion, implantable defibrillators, and automatic external defibrillators. Defibrillation involves delivering electric shocks to the heart during ventricular fibrillation or pulseless ventricular tachycardia. Cardioversion uses lower energy shocks synchronized with the heart's rhythm to convert arrhythmias. Implantable defibrillators continuously monitor the heart rhythm and can deliver shocks to treat ventricular arrhythmias. Automatic external defibrillators are designed for use by laypeople for cardiac arrest.
Cardioversion is a procedure that uses electric shock or drugs to convert an abnormal heart rhythm back to normal. There are two main types - electrical cardioversion, which delivers a synchronized electric shock, and pharmacological cardioversion, which uses antiarrhythmic drugs. Electrical cardioversion can be elective or emergency, while pharmacological cardioversion utilizes various classes of drugs like beta blockers, sodium channel blockers, and calcium channel blockers to restore normal rhythm. The document outlines the differences between cardioversion and defibrillation, indications and contraindications for cardioversion, recommendations, procedure steps, complications, and drug options for pharmacological cardioversion.
This document outlines the functions of an automated external defibrillator (AED), different heart rhythms, special considerations and safety precautions for AED use, and the steps for applying an AED. It discusses that an AED analyzes the heart rhythm and can deliver a shock if needed, lists sinus rhythm, ventricular fibrillation, and asystole as heart rhythms. Special considerations for AED use include water and children, and safety precautions involve checking for perspiration, patches, pendants, piercings, pacemakers, and shaving before applying pads and delivering a shock if instructed by the AED.
The document discusses defibrillation, which uses electric shocks to stop abnormal heart rhythms and allow a normal rhythm to resume. It defines defibrillation and describes the history and mechanisms involved. The types of defibrillators are explained, including automated external defibrillators. Precautions for defibrillation and troubleshooting defibrillators are also reviewed.
Pacemakers are electronic devices that can be used to initiate a heartbeat when the heart's intrinsic electrical system cannot effectively generate an adequate heart rate. There are temporary pacemakers, which are used until the underlying condition resolves, and permanent pacemakers. A pacemaker system consists of a pulse generator and pacing leads. The pulse generator delivers electrical pulses through the leads to stimulate the heart. Pacemakers can pace one or both chambers of the heart and are programmed with settings for rate, output, and sensitivity. Nurses monitor for pacemaker function and complications and educate patients on pacemaker care.
A defibrillator delivers an electric shock to the heart to convert life-threatening abnormal heart rhythms called cardiac arrhythmias back to a normal rhythm. There are two main types - internal defibrillators that are implanted inside the body, and external defibrillators that are used on the outside of the body. A defibrillator works by using electric shocks delivered through electrode pads placed on the chest to depolarize a critical mass of the heart muscle, which terminates the arrhythmia and allows the heart's natural pacemaker to resume control of the heartbeat.
Here are the answers to your questions:
1. A defibrillator is a device that gives a high energy electric shock to the heart to treat potentially life threatening abnormal heart rhythms called arrhythmias.
2. The purpose of a defibrillator is to deliver a therapeutic dose of electric current to the heart with the aim of depolarizing a critical mass of the heart muscle and terminating the arrhythmia, allowing for spontaneous organized cardiac depolarization and contraction to resume.
3. The typical joules delivered by a defibrillator range from 120-360 joules depending on whether it is a monophasic or biphasic defibrillator.
4. Defibrillator pads are placed on the patient
The document provides information about intra-aortic balloon pumps (IABP). It discusses that IABPs were first described in 1958 and have since improved. IABPs provide temporary left ventricular support by displacing blood in the aorta. They work by inflating in diastole and deflating before systole to increase cardiac output and coronary perfusion pressure while decreasing workload. IABPs are used for cardiac failure, unstable angina, postoperative complications, and as a bridge to transplantation. Complications include limb ischemia, bleeding, thrombosis, and infection.
Salient features of the book are -
- The book provides a shortcut to understand and remember certain specific formulae and points you require to interpret the 12-lead ECG.
- Treatment protocols (in green boxes) for most of the important conditions are also included.
- View sample ECGs as you read along the topics.
- The content is explained in a very simple language to provide good conceptions, written from a student’s point of view.
- People can gain their belief in the book after going through sample ECGs which would be available at www.themedicalpost.net/ecg
- The book competes with the other books available in the market in simplicity, summaries, treatment protocols, live diagrams and regularly updated sample ECGs on the website.
Electrocardiography involves recording the electrical activity of the heart over time using skin electrodes. An ECG machine produces a graph called an electrocardiogram. ECGs can be used to identify arrhythmias, ischemia, chamber hypertrophy, and other cardiac conditions. The document discusses the history of ECG machines, basic heart anatomy, ECG calibration, waveforms, and how to interpret rate and rhythm.
This document discusses defibrillation and cardioversion. It defines defibrillation as treatment for life-threatening arrhythmias without a pulse using electrical shock, while cardioversion aims to convert arrhythmias to normal rhythm with or without a pulse. Both use electrical energy to allow normal sinus rhythm. Defibrillation is for immediate use in ventricular fibrillation or pulseless ventricular tachycardia, while cardioversion may be used for unstable or failed chemical cardioversion of atrial fibrillation, atrial flutter, ventricular tachycardia with a pulse. The document reviews the history of defibrillation and types of defibrillators, and provides guidance on defibrillation and cardioversion procedures and considerations.
This document discusses defibrillation, which is a treatment used to restore normal heart rhythm in patients experiencing ventricular fibrillation or pulseless ventricular tachycardia. It defines defibrillation and describes the different types of defibrillators, including manual external defibrillators, automated external defibrillators, implantable cardioverter defibrillators, and wearable cardiac defibrillators. It also covers how defibrillation works, the precautions that must be taken with the procedure, and the risks involved.
A pacemaker is an electronic device that provides electrical stimulation to the heart muscle. Pacemakers were first developed in the 1950s and have since become implantable devices used to treat conditions like sinus node dysfunction and heart block. There are permanent and temporary pacemakers that can be single chamber, dual chamber, or multisite devices. Pacemakers are implanted surgically and connected to the heart with leads to provide pacing in the appropriate chambers. Nursing care involves preoperative teaching, postoperative monitoring for complications, assessing pacemaker function, and educating patients.
this is dealt about the pacemaker temporary and permanent its aim and basic indication for pacemaker breif history of pacemaker development its design and detailed indication of both temporary and permanent pacemaker then method of pacing which should be based on the patient ECG its parts and procedure and complication
A complete Theoretical as well as practical aspects of Cardiac defibrillation with the definition,history,defibrillator and cardiovesrsion,Equipments,pre procedural consideration,care of patient before and after defibrillation,cardiac defibrillation procedure steps with rationale,complications,documentation and legal aspects
A pacemaker is an electronic device that is used to pace the heart when the normal conduction pathway is damaged or diseased. It has three main components: a pulse generator, pacing leads, and healthy myocardium. A pacemaker has three main functions - pacing, sensing, and capture. There are two main types - permanent pacemakers, which are implanted inside the body, and temporary pacemakers, which have an external power source. Pacemakers can operate in either a fixed rate mode, firing constantly, or a demand mode, firing only when the heart rate drops below a preset level. Nursing care for a patient with a pacemaker involves monitoring the heart rate and rhythm, vital signs, bleeding, and infection risk, as
Defibrillator power point presentation for medical studentsNehaNupur8
The document discusses defibrillators, which are medical devices used to deliver electric shocks to the heart to correct irregular heart rhythms like ventricular fibrillation. It defines different types of defibrillators, including manual external defibrillators, automated external defibrillators (AEDs), implantable cardioverter defibrillators, and wearable cardiac defibrillators. The document also outlines the procedures for using defibrillators, important nursing considerations, post-defibrillation care, and precautions.
Defibrillation is a treatment for cardiac arrest that uses electric shocks to restore a normal heart rhythm. It has evolved significantly since its first use on humans in 1947. Key developments include pre-hospital defibrillation by paramedics in the 1960s-70s and the introduction of automated external defibrillators (AEDs) for public use. Defibrillation works by depolarizing the heart and interrupting abnormal rhythms, allowing the heart's natural pacemaker to resume control. It is most effective for shockable rhythms like ventricular fibrillation when administered quickly after cardiac arrest. Modern defibrillators use biphasic waveforms that deliver lower peak currents, reducing risk of injury compared to older
Defibrillation is a process that delivers an electric shock to stop an irregular heartbeat and restore normal rhythm. Early defibrillation within the first few minutes of cardiac arrest is crucial for survival. Pioneers like Claude Beck developed the defibrillator and helped revive heart attack victims. Proper defibrillator use requires correct pad placement and force, as well as ensuring safety from fires and electrical hazards. The delivery of the shock must be coordinated to avoid potential dangers and maximize effectiveness.
Defibrillators are devices used to treat life-threatening cardiac arrhythmias through electric shocks. There are several types of defibrillators including those for defibrillation, cardioversion, implantable defibrillators, and automatic external defibrillators. Defibrillation involves delivering electric shocks to the heart during ventricular fibrillation or pulseless ventricular tachycardia. Cardioversion uses lower energy shocks synchronized with the heart's rhythm to convert arrhythmias. Implantable defibrillators continuously monitor the heart rhythm and can deliver shocks to treat ventricular arrhythmias. Automatic external defibrillators are designed for use by laypeople for cardiac arrest.
Cardioversion is a procedure that uses electric shock or drugs to convert an abnormal heart rhythm back to normal. There are two main types - electrical cardioversion, which delivers a synchronized electric shock, and pharmacological cardioversion, which uses antiarrhythmic drugs. Electrical cardioversion can be elective or emergency, while pharmacological cardioversion utilizes various classes of drugs like beta blockers, sodium channel blockers, and calcium channel blockers to restore normal rhythm. The document outlines the differences between cardioversion and defibrillation, indications and contraindications for cardioversion, recommendations, procedure steps, complications, and drug options for pharmacological cardioversion.
This document outlines the functions of an automated external defibrillator (AED), different heart rhythms, special considerations and safety precautions for AED use, and the steps for applying an AED. It discusses that an AED analyzes the heart rhythm and can deliver a shock if needed, lists sinus rhythm, ventricular fibrillation, and asystole as heart rhythms. Special considerations for AED use include water and children, and safety precautions involve checking for perspiration, patches, pendants, piercings, pacemakers, and shaving before applying pads and delivering a shock if instructed by the AED.
The document discusses defibrillation, which uses electric shocks to stop abnormal heart rhythms and allow a normal rhythm to resume. It defines defibrillation and describes the history and mechanisms involved. The types of defibrillators are explained, including automated external defibrillators. Precautions for defibrillation and troubleshooting defibrillators are also reviewed.
Pacemakers are electronic devices that can be used to initiate a heartbeat when the heart's intrinsic electrical system cannot effectively generate an adequate heart rate. There are temporary pacemakers, which are used until the underlying condition resolves, and permanent pacemakers. A pacemaker system consists of a pulse generator and pacing leads. The pulse generator delivers electrical pulses through the leads to stimulate the heart. Pacemakers can pace one or both chambers of the heart and are programmed with settings for rate, output, and sensitivity. Nurses monitor for pacemaker function and complications and educate patients on pacemaker care.
A defibrillator delivers an electric shock to the heart to convert life-threatening abnormal heart rhythms called cardiac arrhythmias back to a normal rhythm. There are two main types - internal defibrillators that are implanted inside the body, and external defibrillators that are used on the outside of the body. A defibrillator works by using electric shocks delivered through electrode pads placed on the chest to depolarize a critical mass of the heart muscle, which terminates the arrhythmia and allows the heart's natural pacemaker to resume control of the heartbeat.
Here are the answers to your questions:
1. A defibrillator is a device that gives a high energy electric shock to the heart to treat potentially life threatening abnormal heart rhythms called arrhythmias.
2. The purpose of a defibrillator is to deliver a therapeutic dose of electric current to the heart with the aim of depolarizing a critical mass of the heart muscle and terminating the arrhythmia, allowing for spontaneous organized cardiac depolarization and contraction to resume.
3. The typical joules delivered by a defibrillator range from 120-360 joules depending on whether it is a monophasic or biphasic defibrillator.
4. Defibrillator pads are placed on the patient
The document provides information about intra-aortic balloon pumps (IABP). It discusses that IABPs were first described in 1958 and have since improved. IABPs provide temporary left ventricular support by displacing blood in the aorta. They work by inflating in diastole and deflating before systole to increase cardiac output and coronary perfusion pressure while decreasing workload. IABPs are used for cardiac failure, unstable angina, postoperative complications, and as a bridge to transplantation. Complications include limb ischemia, bleeding, thrombosis, and infection.
Salient features of the book are -
- The book provides a shortcut to understand and remember certain specific formulae and points you require to interpret the 12-lead ECG.
- Treatment protocols (in green boxes) for most of the important conditions are also included.
- View sample ECGs as you read along the topics.
- The content is explained in a very simple language to provide good conceptions, written from a student’s point of view.
- People can gain their belief in the book after going through sample ECGs which would be available at www.themedicalpost.net/ecg
- The book competes with the other books available in the market in simplicity, summaries, treatment protocols, live diagrams and regularly updated sample ECGs on the website.
Electrocardiography involves recording the electrical activity of the heart over time using skin electrodes. An ECG machine produces a graph called an electrocardiogram. ECGs can be used to identify arrhythmias, ischemia, chamber hypertrophy, and other cardiac conditions. The document discusses the history of ECG machines, basic heart anatomy, ECG calibration, waveforms, and how to interpret rate and rhythm.
Defibrillation is a process that delivers an electric shock to the heart to stop an irregular heartbeat and restore a normal rhythm. It is commonly used to treat life-threatening cardiac arrhythmias like ventricular fibrillation. The document defines defibrillation and describes the history, principle, types of defibrillators including automated external defibrillators, precautions for use, and potential troubleshooting issues.
Components of Pacemaker and ICDs - understanding the hardwareRaghu Kishore Galla
The document discusses the history and components of cardiac pacing and implantable cardioverter defibrillators (ICDs). It covers the evolution of cardiac pacing from the 1700s to modern devices. It describes the basic components of pacing systems including the pulse generator, leads, electrodes, and batteries. It explains the differences between single chamber, dual chamber, bipolar, and unipolar systems. It provides details on pacemaker functions, concepts of pacing and sensing, and battery chemistries used in pacemakers.
Defibrillation is a process that delivers an electric shock to the heart to stop ventricular fibrillation and restore normal rhythm. It involves using a defibrillator to detect and correct dangerous heart rhythms. There are external defibrillators like AEDs that can be used by laypeople, as well as internal defibrillators implanted in the body. The shock delivered must be of sufficient energy to depolarize enough heart muscle to terminate fibrillation. Proper use and troubleshooting of defibrillators is important for reviving someone experiencing cardiac arrest.
The electrocardiogram(ECG) provides a graphic depiction of the electric forces generated by the heart . The ECG graph appear as a series of deflections and waves produced by each cardiac cycle.
During activation of the myocardium, electrical forces or action potentials are propagated in various directions. These electrical forces can be picked up from the surface of the body by means of electrodes and recorded in the form of an electrocardiogram.
The electrocardiogram (ECG) provides a graphic representation of the heart's electrical activity. It remains a first-line test for evaluating chest pain and abnormalities. The ECG depicts deflections corresponding to atrial and ventricular depolarization and repolarization. Analysis of deflection amplitudes, intervals between deflections, and segments on the ECG trace can provide information on cardiac rhythm, conduction, structure, and function. A standard 12-lead ECG involves limb leads placed on the arms and legs and chest leads placed in predefined positions on the chest to view the heart's electrical activity from multiple angles.
Defibrillation is a process that delivers an electric shock to the heart to stop an irregular heartbeat and restore normal rhythm. It is the only effective treatment for cardiac arrest caused by ventricular fibrillation or pulseless ventricular tachycardia. Early defibrillation is critical, as survival rates decrease by 10% each minute without treatment. Different types of defibrillators include automated external defibrillators and implantable cardioverter defibrillators. Key factors that influence defibrillation success include transthoracic impedance, electrode placement and position, and shock waveform and energy level delivered.
The document provides information about electrocardiograms (ECGs):
1) It defines an ECG as the physical translation of the electrical phenomena created in the heart muscles and produced as a graph by an ECG machine.
2) It describes how ECGs can be used to identify arrhythmias, ischemia, chamber hypertrophy, and other cardiac conditions.
3) It explains the basics of heart anatomy including the four chambers and valves, and how the electrical conduction system generates and transmits electrical impulses to trigger contractions.
This document provides a guide to reading and interpreting electrocardiograms (ECGs). It begins by explaining that ECGs record the electrical impulses of the heart which cause it to contract. It then defines some key ECG terminology and describes the placement of ECG leads on the limbs. The document explains how the P, QRS, and T waves are produced and what each represents in terms of heart function. It discusses factors that can interfere with accurate ECG readings and provides examples of common arrhythmias like premature contractions, tachycardia, and heart block. The overall document serves as a comprehensive primer on the basics of electrocardiography.
An ECG provides a graphical representation of the electrical activity of the heart. It displays deflections and waves that correspond to different stages of the cardiac cycle. Key aspects of an ECG include P, QRS, and T waves that represent atrial depolarization, ventricular depolarization, and ventricular repolarization, respectively. Normal ECG values include a PR interval of 120-200ms and a QT interval of 350-430ms. ECGs are useful for identifying arrhythmias, chamber size abnormalities, and monitoring conditions like myocardial infarction.
Electrocardiography (ECG or EKG) is a process that records and analyzes the electrical activity of the heart over time using electrodes placed on the skin. It was invented in 1903 by Dutch physician Willem Einthoven, who received the Nobel Prize for his creation. A standard ECG uses 10 electrodes placed in specific locations on the limbs and chest to detect electrical signals produced during each heartbeat. The signals are interpreted by an ECG machine to analyze heart rate, rhythms, and for signs of conditions like heart attacks, damage, or defects. An ECG can provide important information about the structure and function of the heart.
The document discusses principles of electrocardiography (ECG). It explains that an ECG complex consists of a PQRST waveform. The P wave indicates atrial depolarization while the QRS wave is produced by ventricular depolarization. It provides a brief history of ECG, noting that Willem Einthoven developed the bipolar triaxial lead system still used today. The document also lists common indications for ECG, such as arrhythmias, shock, or murmurs. It discusses the normal cardiac conduction system and rules for interpreting the polarity of deflections in ECG complexes.
The document provides information about electrocardiograms (ECGs). It discusses the history of ECGs, what an ECG is, how ECGs work, the components of a normal ECG tracing including waves, segments, and intervals, abnormalities that can be detected on ECGs, and the different leads used in ECGs. Specifically, it explains that an ECG is a graphic representation of the electrical activity of the heart, the P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. It also discusses the clinical uses of ECGs to assess cardiac conditions.
An ECG is a recording of the electrical activity of the heart over time using skin electrodes. It is the gold standard for diagnosing cardiac diseases in a noninvasive manner. The ECG records the P wave from atrial depolarization, the QRS complex from ventricular depolarization and repolarization of the atria, and the T wave from ventricular repolarization. Proper electrode placement and ensuring good skin contact is important for obtaining an accurate recording. The recording is then analyzed based on heart rate, rhythm, intervals, wave amplitudes and shapes to identify any abnormalities.
The document provides information about electrocardiography (ECG), including how an ECG works, the parts of an ECG recording, how to position a patient, standardization of readings, the 12 standard ECG leads and additional leads, artifacts that can appear on readings, abnormalities in cardiac rhythm including extrasystoles, tachycardias and fibrillations, and bibliographic references. It describes the device used, details of the recording paper, how leads are obtained and interpreted, and classifications of different cardiac arrhythmias and their characteristics on ECG readings.
An ECG is a record of the heart's electrical activity over time captured by skin electrodes. It is a diagnostic tool used to detect cardiac arrhythmias, conduction abnormalities, electrolyte disturbances, and screen for heart disease. An ECG involves placing electrodes on the skin of the limbs and chest to record the heart's electrical activity through 12 leads that detect the heart from different angles based on Einthoven's triangle. The ECG trace shows the P, QRS, and T waves that correspond to atrial depolarization, ventricular depolarization and repolarization.
An electrocardiogram (ECG) records the electrical activity of the heart. Small metal electrodes are attached to the skin on the arms, legs, and chest to detect electrical impulses from the heart. The ECG machine amplifies and records these impulses, showing normal and abnormal heart rhythms and any signs of heart damage or disease. A normal ECG tracing shows the P wave, QRS complex, and T wave representing atrial and ventricular contractions and repolarizations. The ECG test takes about five minutes and is painless.
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
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2. DEFIBRILLATION
Defibrillation is non synchronized random administration of
shock during a cardiac cycle.
It is a medical technique used to counter the onset of
ventricular fibrillation, a common cause of cardiac
arrest, and pulseless ventricular tachycardia.
In simple terms, the process uses an electric shock to stop
the heart arrhythmias, in the hope that the heart will restart
with rhythmic contractions.
3. HISTORY OF
DEFIBRILLATION
Defibrillation was invented in 1899 by Prevost
and Batelli, two Italian physiologists. They
discovered that electric shocks could convert
ventricular fibrillation to sinus rhythm in dogs.
The first case of a human life saved by
defibrillation was reported by Beck in 1947.
4. THE PURPOSE OF
DEFIBRILLATION
Is to apply a controlled electrical
shock to the heart, which leads to
depolarization of the entire electrical
conductive system of the heart.
5. During defibrillation electrical current travels from the
negative to the positive electrode by traversing
myocardium.
It causes all of the heart cells to contract
simultaneously. This interrupts and terminates
abnormal electrical rhythm. This, in turn, allows the
sinus node to resume normal pacemaker activity.
6. TYPES OF DEFIBRILLATORS
INTERNAL DEFIBRILLATORS
The device may be implanted directly in the user of the
device.
So it is known as an Impalantable cardioverter-
defibrillator or (much less frequently) an internal
cardiac defibrillator (ICD).
This type of defibrillator is designed to provide immediate
defibrillation to high-risk patients .
7. Implantable Cardioversion
Defibrillation
An implantable cardioverter-defibrillator (often called an ICD) is
a device that briefly passes an electric current through the
heart. It is "implanted," or put in your body surgically. It includes
a pulse generator and one or more leads. The pulse generator
constantly watches your heartbeat.
8. TYPES OF DEFIBRILLATORS
Automated External defibrillator (AED).
External defibrillators are typically used in hospitals or
ambulances, but are increasingly common outside
the medical areas .
As automated external defibrillators become safer and
cheaper.
10. In monophasic, there is no ability to adjust for patient
impedance or the resistance to the current exerted
by the patient’s body, and it is generally
recommended that all monophasic defibrillators
deliver 360J of energy in adult patients to ensure
maximum current is delivered in the face of an
inability to detect patient impedance.
11. • Usually the initial voltage applied is higher than the reversed
polarity shock. Biphasic wave forms were initially developed
for use in implantable cardioversion defibrillators (ICD) and
later adapted to external defibrillators. Defibrillators can sense
the thoracic impedance and increase or decrease their
internal resistance so that the selected level of energy is
delivered to the subject.
• Biphasic shocks are more effective than monophasic shocks
and need lesser energy. Typically when 360 Joules are
delivered for defibrillation in a monophasic defibrillator, 200
Joules are given in a biphasic defibrillator.
• This could theoretically reduce the potential damage to the
heart muscle by the high voltage shock.
12. Availability
• Monophasic
defibrillators are less
popular in the current
context.
Availability
• Biphasic defibrillation is
more common
nowadays and used for
implantable as well as
external defibrillators
13. Adjustment for
Patient Impedance
• Monophasic
defibrillator is not able
to adjust the current
according to the
resistance exerted by
the patient’s body.
Adjustment for Patient
Impedance
• Biphasic defibrillators are
capable of changing the
current as per the patient’s
impedance hence known to
be more effective. Different
manufacturers have used
this functionality to produce
different types of biphasic
defibrillators.
14. Strength of the
Current
• Monophasic
defibrillator uses a
fixed current to deliver
360J energy to
terminate cardiac
arrhythmias.
Strength of the Current
• In contrast, biphasic
defibrillators can manually
(shock the patient
with 120-200 Joules) or
automatically adjust the
strength of the current, and
it uses lesser strength than
monophasic defibrillators.
15. Overall Effectively
• Monophasic defibrillators
are less efficient.
Risk of Damaging Heart
Muscles
• Monophasic defibrillator has
a greater risk of damaging
the heart muscle as it
delivers a greater current.
Overall Effectively
• In contrast, biphasic
defibrillators are more
efficient.
Risk of Damaging Heart
Muscles
• Biphasic defibrillator uses
a smaller current and
hence the damage is
minimized.
18. Electrocardiography-
is transthoracic interpretation of
the electrical activity of the heart
over time captured and externally
recorded by skin electrodes for
diagnostic or research purposes
on human hearts.
What is ECG?
19. THE HISTORY OF ECG MACHINE
1903
A Dutch
doctor and physiologist.
He invented the first
practical electrocardiogram and
received the Nobel Prize in
Medicine in 1924 for it
Willem Einthoven
NOW
Modern ECG machine
has evolved into compact
electronic systems that often
include computerized
interpretation of the
electrocardiogram.
21. The graph paper recording produced by the machine is termed an
electrocardiogram,
It is usually called ECG or EKG
STANDARD CALLIBRATION
Speed = 25mm/s
Amplitude =
0.1mV/mm
1mV 10mm high
1 large square 0.2s(200ms)
1 small square 0.04s
(40ms) or 1 mV amplitude
22. 1. Place the patient in a supine or
semi-Fowler's position. If the patient
cannot tolerate being flat, you can do
the ECG in a more upright position.
2. Instruct the patient to place their
arms down by their side and to relax
their shoulders.
3. Make sure the patient's legs are
uncrossed.
4. Remove any electrical devices, such
as cell phones, away from the
patient as they may interfere with the
machine.
5. If you're getting artifact in the limb
leads, try having the patient sit on
top of their hands.
6. Causes of artifact: patient
movement, loose/defective
electrodes/apparatus, improper
grounding.
HOW TO DO ELECTROCARDIOGRAPHY
An ECG with artifacts.
Patient, supine position
23. THE LIMB ELECTRODES
RA - On the right arm, avoiding thick muscle
LA – On the left arm this time.
RL - On the right leg, lateral calf muscle
LL- On the left leg this time.
THE 6 CHEST ELECTRODES
V1 - Fourth intercostal space, right sternal border.
V2 - Fourth intercostal space, left sternal border.
V3 - Midway between V2 and V4.
V4 - Fifth intercostal space, left midclavicular line.
V5 - Level with V4, left anterior axillary line.
V6 - Level with V4, left mid axillary line.
Electrodes
Usually consist of a conducting gel, embedded
in the middle of a self-adhesive pad onto
which cables clip. Ten electrodes are used for a
12-lead ECG.
Placement of electrodes
24. The ECG works mostly by detecting and
amplifying the tiny electrical changes on
the skin that are caused when the heart
muscle "depolarizes" during each heart
beat.
How does an ECG work?
29. PEOPLE USUALLY REFER THE
ELECTRODES CABLES AS
DUDE,
THAT’S
CONFUSING!
LEAD
S
should be correctly
defined as the tracing
of the voltage
difference between
the electrodes and is
what is actually
produced by the ECG
recorder.
LEADS
31. IIIII
LEADS I, II,
III
THEY ARE FORMED BY VOLTAGE TRACINGS BETWEEN
THE LIMB ELECTRODES (RA, LA, RL AND LL). THESE
ARE THE ONLY BIPOLAR LEADS. ALL TOGETHER THEY
ARE CALLED THE LIMB LEADS OR
THE EINTHOVEN’S TRIANGLE
RA LA
RL LL
I
32. LEADS aVR, aVL,
aVF
THEY ARE ALSO DERIVED FROM THE LIMB ELECTRODES, THEY
MEASURE THE ELECTRIC POTENTIAL AT ONE POINT WITH
RESPECT TO A NULL POINT. THEY ARE THE AUGMENTED LIMB
LEADS
RA LA
RL LL
aVR
aVF
aVL
33. LEADS
V1,V2,V3,V4,V5,
V6
THEY ARE PLACED DIRECTLY ON THE CHEST. BECAUSE
OF THEIR CLOSE PROXIMITY OF THE HEART, THEY DO
NOT REQUIRE AUGMENTATION. THEY ARE CALLED THE
PRECORDIAL LEADS
RA LA
RL LL
V1
V2
V3
V4
V5
V6
34. These leads help to determine heart’s electrical axis. The
limb leads and the augmented limb leads form the frontal
plane. The precordial leads form the horizontal plane.
35. Leads Anatomical representation of the heart
V1, V2, V3, V4 Anterior
I, aVL, V5, V6 left lateral
II, III, aVF inferior
aVR, V1 Right atrium
The Different Views Reflect The Angles At Which LEADS "LOOK" At
The Heart And The Direction Of The Heart's Electrical Depolarization.
37. THE NORMAL SIZE <3 small square
< 2 large square
< 2 small square
<3-5 small square
38. DEPOLARIZATION
• Contraction of any muscle which is associated with
electrical changes called depolarization
• These changes can be detected by electrodes
attached to the surface of the body
39. If a wavefront of
depolarization
travels towards the
positive electrode, a
positive-going
deflection will result.
If the waveform
travels away from
the positive
electrode, a
negative going
deflection will be
seen.
Understanding
ECG Waveform
40. With EKGs we can identify:-
• Arrhythmias
• Myocardial ischemia and infarction
• Pericarditis
• Chamber hypertrophy
• Electrolyte disturbances (i.e. hyperkalemia,
hypokalemia)
• Drug toxicity (i.e. digoxin and drugs which
prolong the QT interval)
43. PACEMAKERS OF THE HEART
• SA Node - Dominant pacemaker with an intrinsic
rate of 60 - 100 beats/minute.
• AV Node - Back-up pacemaker with an intrinsic rate
of 40 - 60 beats/minute.
• Ventricular cells - Back-up pacemaker with an
intrinsic rate of 20 - 45 bpm.
44. IMPULSE CONDUCTION & THE ECG
Sinoatrial node
AV node
Bundle of His
Bundle Branches
Purkinje fibers
46. OBTAIN A N ECG, ACT CONFIDENT, READ THE PT DETAILS
47. OBTAIN A N ECG, ACT CONFIDENT, READ THE PT DETAILS
Some ECG machines come with interpretation software. This one says
the patient is fine. DO NOT totally trust this software.
48. Rate
Rhythm
Cardiac Axis
P – wave
PR - interval
QRS Complex
ST Segment
QT interval (Include T and U wave)
Other ECG signs
THE BEST WAY TO INTERPRET AN ECG IS TO DO IT STEP-BY-
STEP
50. CALCULATING RATE
300
the number of BIG SQUARE between R-R interval
Rate =
As a general interpretation, look at lead II at the bottom part of the ECG strip.
This lead is the rhythm strip which shows the rhythm for the whole time the ECG
is recorded. Look at the number of square between one R-R interval. To calculate
rate, use any of the following formulas:
1500
the number of SMALL SQUARE between R-R interval
OR
Rate =
52. If you think that the rhythm is not regular, count the number of electrical beats in
a 6-second strip and multiply that number by 10.(Note that some ECG strips have 3
seconds and 6 seconds marks) Example below:
CALCULATING RATE
1 2 3 4 5 6 7 8
= (Number of waves in 6-second strips) x 10
= 8 x 10
= 80 bpm
Rate
There are 8 waves in this 6-seconds strip.
53. You can also count the number of beats on any one row over the ten-second strip
(the whole lenght) and multiply by 6. Example:
CALCULATING RATE
= (Number of waves in 10-second strips) x 6
= 13 x 6
= 78 bpm
Rate
54. Interpretation bpm Causes
Normal 60-99 -
Bradycardia <60 hypothermia, increased vagal tone (due to vagal
stimulation or e.g. drugs), atheletes (fit people)
hypothyroidism, beta blockade, marked intracranial
hypertension, obstructive jaundice, and even in
uraemia, structural SA node disease, or ischaemia.
Tachycardia >100 Any cause of adrenergic stimulation (including
pain); thyrotoxicosis; hypovolaemia; vagolytic drugs
(e.g. atropine) anaemia, pregnancy; vasodilator
drugs, including many hypotensive agents; FEVER,
myocarditis
CALCULATING RATE
56. Look at p waves and their relationship to QRS complexes.
Lead II is commonly used
Regular or irregular?
If in doubt, use a paper strip to map out consecutive beats and see whether the
rate is the same further along the ECG.
Measure ventricular rhythm by measuring the R-R interval and atrial rhythm by
measuring P-P interval.
RHYTHM
57. RHYTHM
ECG rhythm characterized by a usual rate of anywhere between 60-99 bpm,
every P wave must be followed by a QRS and every QRS is preceded by P
wave. Normal duration of PR interval is 3-5 small squares. The P wave is
upright in leads I and II
Normal Sinus Rhythm
60. RHYTHM
Atrial Fibrillation
A-fib is the most common cardiac arrhythmia involving atria.
Rate= ~150bpm, irregularly irregular, baseline irregularity, no visible p waves,
QRS occur irregularly with its length usually < 0.12s
61. RHYTHM
Atrial Flutter
Atrial Rate=~300bpm, similar to A-fib, but have flutter waves, ECG baseline
adapts ‘saw-toothed’ appearance’. Occurs with atrioventricular block (fixed
degree), eg: 3 flutters to 1 QRS complex:
62. RHYTHM
Ventricular tachycardia
fast heart rhythm, that originates in one of the ventricles- potentially life-
threatening arrhythmia because it may lead to ventricular fibrillation, asystole,
and sudden death.
Rate=100-250bpm
64. RHYTHM
Torsades de Pointes ( polymorphic VT)
literally meaning twisting of points, is a distinctive form of polymorphic
ventricular tachycardia characterized by a gradual change in the
amplitude and twisting of the QRS complexes around the isoelectric
line. Rate cannot be determined.
65. RHYTHM
Supraventricular Tachycardia
SVT is any tachycardic rhythm originating above the ventricular tissue.Atrial and
ventricular rate= 150-250bpm
Regular rhythm, p is usually not discernable.
*Types:
•Sinoatrial node reentrant tachycardia (SANRT)
•Ectopic (unifocal) atrial tachycardia (EAT)
•Multifocal atrial tachycardia (MAT)
•A-fib or A flutter with rapid ventricular response. Without rapid ventricular response both
usually not classified as SVT
•AV nodal reentrant tachycardia (AVNRT)
•Permanent (or persistent) junctional reciprocating tachycardia (PJRT)
•AV reentrant tachycardia (AVRT)
66. RHYTHM
Asystole
a state of no cardiac electrical activity, hence no contractions of the
myocardium and no cardiac output or blood flow.
Rate, rhythm, p and QRS are absent
67. METHODS OF DEFIBRILLATION
The shock is generally conducted through the heart by
two electrodes, in the form of two hand-held paddles
or adhesive patches depending on the variety of the
defibrillator.
68. POSITION OF THE PADDLES
ADULT:-One paddle is placed in
the right infraclavicular region, while
the other is placed in the left 5th
- 6th
intercostal space anterior axillary
line.
PEDIATRIC:- Alternatively antero-
posterior may be used: one paddle is
placed in the left infrascapular region
while the other is placed in the left 5th
-
6th
intercoastal space anterior axillary
line.
69. METHODS OF DEFIBRILLATION
Open-chest defibrillators also exist, which have
electrodes in the form of two cup-shaped paddles
that surround the sides of the heart and shock it
directly.
Open-chest defibrillators generally require less energy
to operate due to direct contact with the heart .
70. METHODS OF DEFIBRILLATION
The number of attempts is in practice limited to a
series of three or four attempts at increasing
energies.
The likelihood of restoring normal heart rhythm is
much less in successive attempts.
71.
72.
73. AUTOMATED EXTERNAL
DEFIBRILLATOR (AED)
• AEDs come in various models.
• Some operator interaction
required.
• A specialized computer
recognizes heart rhythms that
require defibrillation.
74.
75. Potential AED Problems
• Battery is dead.
• Patient is moving.
• Patient is responsive and has
a rapid pulse.
76. AED ADVANTAGES
• ALS providers do not need to be on
scene.
• Remote, adhesive defibrillator pads
are used.
• Efficient transmission of electricity
77. RATIONALE FOR EARLY
DEFIBRILLATION
• Early defibrillation is the third link in the chain of
survival.
• A patient in ventricular fibrillation needs to be
defibrillated within 2 minutes.
78. AED Maintenance
• Read operator’s manual.
• Check AED and battery at beginning of each shift.
• Get a checklist from the manufacturer.
• Report any failures to the manufacturer and the
FDA.
79. PREPARATION
• Make sure the electricity injures no one.
• Do not defibrillate a patient lying in pooled water.
• Dry a soaking wet patient’s chest first.
• Do not defibrillate a patient who is touching metal.
• Remove nitroglycerin patches.
• Shave a hairy patient’s chest if needed.
80. Using an AED (1 of 8)
• Assess responsiveness.
• Stop CPR if in progress.
• Check breathing and pulse.
• If patient is unresponsive
and not breathing
adequately, give two slow
ventilations.
81. Using an AED (2 of 8)
• If there is a delay in
obtaining an AED, have
your partner start or
resume CPR.
• If an AED is close at
hand, prepare the AED
pads.
• Turn on the machine.
82. Using an AED (3 of 8)
• Remove clothing from
the patient’s chest area.
Apply pads to the chest.
• Stop CPR.
• State aloud, “I Clear,
you clear everybody
clear”.
83. Using an AED (4 of 8)
• Push the analyze button, if
there is one.
• Wait for the computer.
• If shock is not needed,
start CPR.
• If shock is advised, make
sure that no one is
touching the patient.
• Push the shock button.
84. Using an AED (5 of 8)
• After the shock is delivered, begin 5 cycles of CPR,
beginning with chest compressions.
• After 5 cycles, reanalyze patient’s rhythm.
• If the machine advises a shock, clear the patient and
push shock button.
• If no shock advised, check for pulse.
85. Using an AED (6 of 8)
• If the patient has a
pulse, check breathing.
• If the patient is breathing
adequately, provide
oxygen via
nonrebreathing mask
and transport.
86. Using an AED (7 of 8)
• If the patient is not
breathing adequately, use
necessary airway adjuncts
and proper positioning to
open airway.
• Provide artificial
ventilations with high-
concentration oxygen.
• Transport.
87. Using an AED (8 of 8)
• If the patient has no pulse, perform 2 minutes of CPR.
• Gather additional information on the arrest event.
• After 2 minutes of CPR, make sure no one is touching the
patient.
• Push the analyze button again (as applicable).
• If necessary, repeat alternating CPR/Analyze/Shock until ALS
arrives.
• Transport and check with medical control.
• Continue to support the patient as needed.
88. After AED Shocks
• Check pulse.
• No pulse, no shock advised
• If a patient is breathing independently:
• Administer oxygen.
• Check pulse.
• If a patient has a pulse but breathing is
inadequate, assist ventilations.
89. TRANSPORT CONSIDERATIONS
• Transport:
• When patient regains pulse
• After delivering six to nine shocks
• After receiving three consecutive “no shock
advised” messages
• Keep AED attached.
• Check pulse frequently.
• Stop ambulance to use an AED.
91. DEFINITION
Cardio version is a synchronized administration of
shock during the R waves or QRS complex of a
cardiac cycle.
Cardioversion is a method to restore a rapid heart
beat back to normal .
Cardioversion is used in persons who have heart
rhythm problems (arrhythmias), which can cause
the heart to beat too fast.
92. CARDIO VERSION
Most elective or non-emergency Cardio versions are
performed :
• To treat atrial fibrillation or atrial flutter to regain heart
rhythm.
• To treat disturbances originating in the upper
Chambers (atria) of the heart.
93. CARDIO VERSION
Cardio version is used in emergency
situations to correct a rapid abnormal
rhythm associated with faintness,
low blood pressure, chest pain,
difficulty breathing, or loss of
consciousness.
94. INDICATIONS
• Supraventricular tachycardia (atrioventricular nodal
reentrant tachycardia [AVNRT] and atrioventricular
reentrant tachycardia [AVRT])
• Atrial fibrillation
• Atrial flutter (types I and II)
• Ventricular tachycardia with pulse.
95. TYPES OF CARDIO VERSION
Cardio version can be "CHEMICAL" or
"ELECTRICAL".
• CHEMICAL CARDIO VERSION: refers to the
use of antiarrhythmia medications
to restore the heart's normal rhythm.
100. POSITION OF THE PADDLES
ADULT:-One paddle is placed in
the right infraclavicular region, while
the other is placed in the left 5th
- 6th
intercostal space anterior axillary
line.
PEDIATRIC:- Alternatively antero-
posterior may be used: one paddle is
placed in the left infrascapular region
while the other is placed in the left 5th
-
6th
intercoastal space anterior axillary
line.
101. THE GOALS OF THE
ELECTRICAL CARDIO
VERSION
• Is to disrupt the abnormal electrical circuit(s) in the
heart.
• To restore a normal heart beat.
102. PHARMACOLOGIC CARDIO
VERSION
Cardioversion can be done using drugs that are taken
by mouth or given through an intravenous line (IV).
It can take several minutes to days for a
successful cardio version.
Ex:- Amiodarone therapy (Antiarrythmic agent) starting
4 weeks before and continuing for up to 12 months.
103. PHARMACOLOGIC CARDIO
VERSION
• If pharmacological cardioversion is done in
a hospital, your heart rate will be regularly
checked.
• Cardioversion using drugs can be done outside the
hospital, but this requires close follow-up with a
cardiologist.
105. COMPLICATIONS
Possible complications of cardioversion
are uncommon but may include:
• Worsening of the arrhythmias .
• Blood clots that can cause a stroke or other organ
damage, bruising, burning or pain where the paddles
were used.
• Allergic reactions from medicines used in
pharmacologic cardioversion .
106. EQUIPMENT
• Defibrillator with a synchronizing button.
• Emergency trolley with emergency drugs;
( lignocaine, atropine, and adrenaline ).
• Oxygen mask, intubation equipment, airway .
• Monitor and continuous recording facilities.
107. PREPARING FOR A CARDIO
VERSION
Do not eat or drink for at least eight hours prior to the
procedure.
Take your regularly scheduled medications the morning
of the procedure unless your medical practitioner has told
you otherwise .
Bring a list of all your medications with you.
108. PREPARING FOR A CARDIO
VERSION
Do not apply any lotions or ointments to chest or back as
this may interfere with the adhesiveness of the shocking
pads.
Do not drive yourself home after receiving sedation
anesthesia.
109. PREPARING FOR A CARDIO
VERSION
Do not operate a car, heavy machinery, or make any
important decisions.
Stop digoxin before 48 hours prior the procedure.
Apply ointment to the area to reduce the discomfort.
110. OUTCOME
The procedure will be terminated either by
a successful reversion to sinus rhythm or
when the medical officer determines that
cardio version will not revert the rhythm.
111. • It is a non- synchronized
delivery of energy during any
phase of the cardiac cycle.
• Indications: VT/VF
• Usually an emergency
treatment.
• May or may not always use
sedation, sometimes mild
administration of sedation is
done.
• Delivery of energy that is
synchronized to the large R
waves or QRS complex.
• Indications: SVT, AF, sinus
tachycardia, Ventricular
tachycardia.
• Cardio version is usually a
planned procedure.
• always use sedation,
administration of sedation is
done with short acting agents
such as MIDAZOLAM.
112. SPECIAL POPULATION
Cardio version in patients with digitalis
toxicity
• Digoxin overdose or toxicity can present with any
type of tachyarrhythmias or bradyarrhythmias.
Cardioversion in the setting of digoxin toxicity is a
relative contraindication. Digitalis sensitizes the
heart to the electrical stimulus. Prior to
cardioversion, electrolytes should be normalized.
Cardioversion may cause additional arrhythmias,
especially ventricular fibrillation.
113. SPECIAL POPULATION
Cardioversion in patients with permanent
pacemakers/ICDs
• Cardioversion in patients with permanent
pacemaker/ICD should be performed with extra care.
Improper technique may damage the device, lead
system, or myocardial tissue, resulting in device
malfunction. The electrode paddle or patch should be at
least 12 cm from the pulse generator and
anteroposterior paddle position.[15, 16]
The lowest amount of
energy should be used during cardioversion, based on
the patient’s clinical condition. After cardioversion, the
pacemaker/ICD should be interrogated to ensure normal
function of the device.
114. SPECIAL POPULATION
Cardioversion during pregnancy
• Cardioversion can be performed safely in pregnant
women. The fetal heart rate should be monitored
during the procedure using fetal monitoring
techniques.