Monophasic defibrillation thresholds increased from ( mean + / - SD ) 13.7 + / - 6.0 J to 16.8 + / - 6.7 J ( p = 0.02 ) , whereas biphasic thresholds were unchanged ( 10.4 + / - 4.3 J to 10.2 + / - 4.8 J , p = 0.86 ) in the same patients .
