Comparative Modeling of Biphasic Defibrillation Pulses: Quasi-sinusoidal and Trapezoidal with Sloping Rise and Fall

A model of a defibrillator power module generating pulses of arbitrary shape with load impedance of 25-250 Ω was used to obtain the characteristics of biphasic pulses: quasi-sinusoidal pulses (Gurvich–Venin pulses) and trapezoidal pulses with sloping rise and fall. At high load impedances (100-250 Ω), production of trapezoidal pulses, as compared with quasi-sinusoidal, produced larger mean first-phase currents (by 11-20%) and greater pulse energy (by 25-35%).