BACKGROUND: The fatal outcome of victims after initially successful resuscitation from cardiac arrest has been attributed both to global myocardial ischemia during the interval of cardiac arrest and to the adverse effects of reperfusion. The present study was prompted by earlier experimental observation that the magnitude of myocardial dysfunction was in part related to the energy delivered during electrical defibrillation. METHODS AND RESULTS: Ventricular fibrillation (VF) was induced in 15 Sprague-Dawley rats. Precordial compression was begun together with mechanical ventilation after 4 minutes of untreated VF and continued for 6 minutes. Spontaneous circulation was restored in each animal after external defibrillation with a single stored 2-, 10-, or 20-J countershock. Cardiac index and the rate of left ventricular pressure rise at left ventricular pressure of 40 mm Hg (dP/dt40) and fall (negative dP/dt) during the 240-minute interval after successful resuscitation were decreased, and left ventricular diastolic pressure was increased. These decreases in myocardial function were closely related to the energy of electrical defibrillation. After a 20-J shock, animals survived for only 5+/-3 hours; after a 10-J shock, animals survived for 15+/-4 hours; and after a 2-J shock, all animals survived for >24 hours. CONCLUSIONS: The severity of postresuscitation myocardial dysfunction is related, at least in part, to the magnitude of the electrical energy of the delivered shock.
BACKGROUND: The fatal outcome of victims after initially successful resuscitation from cardiac arrest has been attributed both to global myocardial ischemia during the interval of cardiac arrest and to the adverse effects of reperfusion. The present study was prompted by earlier experimental observation that the magnitude of myocardial dysfunction was in part related to the energy delivered during electrical defibrillation. METHODS AND RESULTS:Ventricular fibrillation (VF) was induced in 15 Sprague-Dawley rats. Precordial compression was begun together with mechanical ventilation after 4 minutes of untreated VF and continued for 6 minutes. Spontaneous circulation was restored in each animal after external defibrillation with a single stored 2-, 10-, or 20-J countershock. Cardiac index and the rate of left ventricular pressure rise at left ventricular pressure of 40 mm Hg (dP/dt40) and fall (negative dP/dt) during the 240-minute interval after successful resuscitation were decreased, and left ventricular diastolic pressure was increased. These decreases in myocardial function were closely related to the energy of electrical defibrillation. After a 20-J shock, animals survived for only 5+/-3 hours; after a 10-J shock, animals survived for 15+/-4 hours; and after a 2-J shock, all animals survived for >24 hours. CONCLUSIONS: The severity of postresuscitation myocardial dysfunction is related, at least in part, to the magnitude of the electrical energy of the delivered shock.
Authors: Marc D Berg; Isabelle L Banville; Fred W Chapman; Robert G Walker; Mohammed A Gaballa; Ronald W Hilwig; Ricardo A Samson; Karl B Kern; Robert A Berg Journal: Pediatr Crit Care Med Date: 2008-07 Impact factor: 3.624
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Authors: Jeanne E Poole; George W Johnson; Anne S Hellkamp; Jill Anderson; David J Callans; Merritt H Raitt; Ramakota K Reddy; Francis E Marchlinski; Raymond Yee; Thomas Guarnieri; Mario Talajic; David J Wilber; Daniel P Fishbein; Douglas L Packer; Daniel B Mark; Kerry L Lee; Gust H Bardy Journal: N Engl J Med Date: 2008-09-04 Impact factor: 91.245
Authors: Fei Han; Manuel Boller; Wenhui Guo; Raina M Merchant; Joshua W Lampe; Thomas M Smith; Lance B Becker Journal: Resuscitation Date: 2009-11-18 Impact factor: 5.262