부산대학교 도서관

The source of electric power being AC 100v, 50-60c/s, maximum output 200ws, maximum charge voltage 1300v, pulse width 10 m sec, and 5m sec., condenser capacity 100μF and 50μF, output impedance 50Ω (10ms.) and 73Ω (5ms.), recharge time was less than 3 sec, and external and internal diameter of electrode being 80mm and 60mm.This initial apparatus weighed 107kg, and was not practical, so the second one was devised and weight reduced to one fourth the initial one. The pulse width was determined to be 2.5 m sec., maximum charge voltage 4500v with 200 w sec. Furthermore discharge of less than 10 w sec, was not obtained because of prevention of danger. When the switch is off, accumulated potential was discharged automaticaly inside the apparatus to prevent discharge of high voltage on the hand of the manipulator due to stained surface of electrode.In experiments on dogs, ventricular fibrillation was created by the induction of AC 100v for 2 sec. on the anterior chest wall. With external defibrillation, it was necessary to give more than 20 w sec, and with internal defibrillation, excellent results were obtained by more than 3 w sec. Contrary to this, the occurence of ventricular fibrillation was never observed at 1 w sec.Internal defibrillation was attempted clinically on 2 cases of ventricular fibrillation at the time of operation and defibrillation was obtained at 200 w sec, on each case.