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Difference Between a Biphasic and Monophasic Defibrillators

All About Cardiovascular System and Disorders

Biphasic waveforms were initially developed for use in implantable cardioverter 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.

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Ventricular Tachycardia Management

All About Cardiovascular System and Disorders

Recurrent ventricular tachycardia in spite of radiofrequency catheter ablation needs an implantable cardioverter defibrillator. Those at risk of recurrent VT with previous myocardial infarction and left ventricular dysfunction also need an implantable defibrillator.

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CRT-P and CRT-D

All About Cardiovascular System and Disorders

ICD is short form for implantable cardioverter defibrillator, used to automatically shock back the heart into action in case of life threatening ventricular arrhythmias. CRT alone is now re-designated as CRT-P or CRT with pacing alone. This is because there is another device known as CRT-D in which a CRT is combined with an ICD.

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Evaluation of JVP

All About Cardiovascular System and Disorders

Thrombus can sometimes occur when there is a central venous catheter or a multiple pacemaker or defibrillator leads there that can cause thrombus formation. So this is a schematic represention of superior vena caval obstruction, which causes enlarged, non pulsatile jugulars. Obstruction could be due to tumour or even a thrombus.

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Why is an Implantable Defibrillator NOT Useful Soon After Myocardial Infarction?

All About Cardiovascular System and Disorders

Here is the transcript of the video: Implantable defibrillator is an important life saving device. Then, why is it mentioned that, implanting a defibrillator soon after an acute myocardial infarction, in those with left ventricular dysfunction and prone for ventricular arrhythmias and sudden cardiac death, is not useful?

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Brugada Syndrome

All About Cardiovascular System and Disorders

Medical therapy by and large is not that effective in Brugada syndrome, and the most recommended therapy if you have a definite diagnosis of Brugada syndrome, is implantation of an implantable cardioverter defibrillator for saving from sudden death which can occur due to life threatening ventricular arrhythmias in Brugada syndrome.

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Commotio cordis

All About Cardiovascular System and Disorders

The development of better chest protectors and widespread use of automated external defibrillators (AED) in the playground may help prevent such deaths. This agrees with the usual observation of commotio cordis in youth baseball with estimated speeds in the range of 48 to 80 km/h.