5
Ventricular fibrillation the vulnerable period. (50 Hz) there is
a considerable decrease the threshold fibrillation the current flow prolonged beyond
one cardiac cycle.
.EFFECTS CURRENT PASSING THROUGH THE HUMAN BODY 25
For frequencies above 100 kHz the tingling sensation characteristic for the perception at
lower frequencies changes into sensation warmth for current intensities the order some
hundred milliamperes.).1), and likely occur for current magnitudes the order several amperes, only the
shock fall the vulnerable period.c.
Figure 4.1.For shocks current above and durations longer
than one cardiac cycle reversible cardiac arrest may caused.
The threshold ventricular fibrillation depends physiological parameters (anatomy of
the body, state cardiac function, etc.4. Occurrence vulnerable period wave) corresponds to
the blood pressure maximum (Fig.) well electrical parameters duration and
pathway current flow, current parameters, etc.4.1. Effects electrocardiogram and blood
pressure. This effect results from the increase inhomogeneity the excitatory state of
the heart due the current-induced extrasystoles.
For shock duration below 0,1 fibrillation may occur for current magnitudes above 500 mA
(Fig.5). With sinusoidal a.1
