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Rescue Life - User Manual Rev. 3.1
68
EASE IN COMPENSATION OF PATIENT IMPEDANCE
Through Biphasic technology, defibrillation shock delivery is controlled while taking into
consideration the patient’s impedance. The patient’s impedance is m
easured through
the defibrillator electrodes. According to the m
easured patient’s impedance, e
-cube
Biphasic technology adjusts the duration of current flow to optimize the effectiveness
of the shock delivery. E-cube Biphasic technology is based on 3 core technologies. 1
The technology for
measuring the patient’s imped
ance. 2 The technology for controlling
the voltage level to be delivered. 3 The technology for controlling the duration of current
flow.
These technologies can adjust the parameters of the shock waveform to match the
transthoracic impedance of the patient. Biphasic technology increases the duration of
current flow for patients with high impedance. When escalating energy, for example
150J to 180J, it delivers the electrical energy with higher vo
ltage level if the patient’s
impedance does not vary.
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].
