AICD - Automated Implantable Cardioverter-Defibrillator...

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Automated Implantable Cardioverter- Defibrillator Presented By: Manisha Patel Krunal Patel Kate Nelson
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OUTLINE Introduction AICD Structure of AICD Working of AICD Reference
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Introduction What is defibrillation ? Defibrillation is the definitive treatment for the life-threatening cardiac arrhythmias Defibrillation consists of delivering a therapeutic dose of electrical energy to the affected heart which depolarizes a critical mass of the heart muscle, terminates the arrhythmia, and allows normal sinus rhythm to be reestablished by the body's natural pacemaker, in the sinoatrial node of the heart What is a defibrillator ? It is a device that gives out a high-energy electrical impulse to stop very fast and abnormal heartbeats and returns the heart to a normal rhythm. It can be external (placed on the chest) or internal (surgically placed in the chest)
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External Defibrillator Automatic External Defibrillator (AED) Internal Defibrillator (AICD) Purpose of a Resume Different types of defibrillators Automatic External Defibrillator (AED) Automatic Implantable Cardioverter – Defibrillator (AICD)
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Resume Basics An Automatic Implantable Cardioverter – Defibrillator (AICD) is a small battery powered electrical impulse generator which is implanted in patients who are at risk of sudden cardiac death due to ventricular fibrillation and Tachycardia. AICD Ventricular fibrillation Ventricular Tachycardia Normal Sinus rhythm
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• An abnormal irregular heart rhythm whereby there are very rapid uncoordinated fluttering contractions of the lower chambers (ventricles) of the heart. • The heart fails to adequately pump blood and leads to unconsciousness within 20 - 30 seconds, irreversible brain damage after about 5 minutes, followed by death. • It is life threatening. • Blood Circulation Ceases • Blood Pressure Decreases • Heart Rate > 250 • Cardiac Output Drops to Zero • Ejection Fraction < 30 % Causes of VF • Heart Disease – Myocardial Infraction, structural abnormalities, arrhythmias • Pulmonary embolism – Blocked Lung Vessels • Electric Shock • Drug overdoses, trauma and cancer • Hypothermia Ventricular fibrillation Source: Companion CD for Handbook of Cardiac Anatomy, physiology and devices
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Conduction Pattern in Heart
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Ventricular Fibrillation
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• An abnormally rapid heart rhythm that originates from a ventricle. • There is dissociation between atrial and ventricular activity. • Rate > 100 beats per minute (usually 150-200) • Wide QRS complexes (>120 ms) • Ventricular filling time and preload decreases • Stoke volume decreases • Cardiac output decreases • No effective pulse, and is a cause of cardiac arrest. • Ejection Fraction < 30% Causes • CAD or structural heart disease. • Electrolyte deficiencies (eg, hypokalemia, hypocalcemia, hypomagnesia). • Use of sympathomimetic agents (caffeine, methamphetamine or cocaine) • Drugs that prolong the QT complex (eg, type 1A antiarrhythmics, droperidol and related antiemetics) Ventricular Tachycardia Source: Companion CD for Handbook of Cardiac Anatomy, physiology and devices
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Ventricular Tachycardia
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This note was uploaded on 02/27/2008 for the course BME 501 taught by Professor Yamashiro,hsiai during the Fall '07 term at USC.

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AICD - Automated Implantable Cardioverter-Defibrillator...

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