BACKGROUND Biphasic waveform shocks are more effective than monophasic shocks for transchest ventricular defibrillation, atrial cardioversion, and defibrillation with implantable defibrillators but have not been studied for open chest, intraoperative defibrillation. This prospective, blinded, randomized clinical study compares biphasic and monophasic shock effectiveness and establishes intraope...

Introduction. Compound Muscle Action Potential (CMAP) scan is a noninvasive promissory technique for neurodegenerative pathologies diagnosis. In this work new CMAP scan protocols were implemented to study the influence of electrical pulse waveform on peripheral nerve excitability. Methods. A total of 13 healthy subjects were tested. Stimulation was performed with an increasing intensities range...

Studies o f 240 transthoracic fibrillation-defibrillation episodes in calves of 91-108 kg are reported. The waveform in 120 o f the episodes was a one-cycle, quasisinusoidal waveform having peak currents o f 64 and 3 2 A and half-cycle durations o f 4 and 6 ms. The episodes were interlaced with 120 others involving critically dam ped sinusoid wave­ forms having a 70.2-A peak current at 1.1 m s ...

Background—In the present study, we compared an automatic external defibrillator (AED) that delivers 150-J biphasic shocks with traditional high-energy (200to 360-J) monophasic AEDs. Methods and Results—AEDs were prospectively randomized according to defibrillation waveform on a daily basis in 4 emergency medical services systems. Defibrillation efficacy, survival to hospital admission and disc...

BACKGROUND AND OBJECTIVE All internal defibrillators and some external defibrillators use biphasic waveforms. The study analysed the discharged waveform pulses of two manual and two semi-automated biphasic external defibrillators. METHODS AND RESULTS The defibrillators were discharged into resistive loads of 25, 50 and 100 Omega simulating the patient's transthoracic impedance. The tested bip...

Z. Bardy GH, Troutman C, Johnson G, Mehra R, Poole JE, Dolack GE, Kudenchuk P J, Gartman DM. Electrode system influence on biphasic waveform defibrillation efficacy in h~urnax~s. Circulation 1991; 84:665-71. 2. Kavanagh KM, Tang ASL, Rollins DL, Smith WM, Ideker RE. Comparison of the internal defibrillation thresholds for monophasic and double and single capacitor biphasic waveforms. J Am Coll ...

Certain biphasic waveforms require less energy to defibrillate than do monophasic pulses of equal duration, although the mechanisms of this increased effectiveness remain unclear. This study used strength-duration and percent success curves for defibrillation with monophasic and biphasic truncated exponential waveforms to explore these mechanisms. In part 1, defibrillation thresholds were deter...