RESULTS	The two-electrode system was associated with a higher defibrillation energy requirement ( 10.8 + / - 5.5 J ) than was the three-electrode system ( 8.9 + / - 6.7 J , p < 0.05 ) , however , the leading edge voltage was not significantly different between systems ( 361 + / - 103 V vs. 397 + / - 123 V , P = 0.07 ) .\