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9
Rescue Life
– Instruction For Use
Rev.0.5 – 30/03/2022
MORE EFFICIENT THAN MONOPHASIC WAVEFORM
The electrical therapy delivered by transthoracic cardiac defibrillators has changed little since the
introduction of direct-current defibrillation more than 30 years ago. Throughout this time, the industry-
standard shock waveform for external defibrillators has been a monophasic damped sine (MDS) waveform,
in which current flows in one direction throughout the shock. Many well-organized emergency medical
systems, using monophasic devices for early defibrillation, have documented better than 20% survival to
hospital discharge for cardiac arrest patients found in ventricular fibrillation (VF). Attempts to improve this
survival rate have adapted proposals to change the waveform and energy level of defibrillation shocks [6].
6-3
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