A Population-Based Method for the Estimation of Defibrillation Energy Requirements in Humans

Abstract

The nonthoracotomy lead system used in this study demonstrated stability of defibrillation energy requirements at implant and 3-month follow-up. A new technique for the estimation of the defibrillation energy dose-response relationship was derived by using a weighted logistic regression analysis.

Rise in defibrillation threshold after postoperative cardiac remodeling in a patient with severe Ebstein’s anomaly

“…Prior experiments have shown that 14% of the transthoracic current is shunted by the lung during transthoracic defibrillation 6 . Newman and colleagues 7 assessed the time-dependent effects with a transvenous defibrillation system and found that the impedance rises during follow-up. At our 2-month follow-up, we noted a 25% decrease in impedance rather than a rise as was expected.…”

Pulmonary, Cardiovascular and Mechanical Complications of Implantable Cardioverter Defibrillators (ICDs)

“…A high defibrillation energy requirement (over 24 Joules) provides little margin for safety. However, in the absence of any changes in the clinical status of the patient, defibrillation energy requirements with a transvenous lead system are generally stable over a three month period (Newman D et al, 1997). Inappropriate shocks most often occur due to supraventricular tachycardia, self-terminating VT, and sensing artifacts, e.g., myopotentials or T wave oversensing.…”