Ratio of direct current (DC) to its equivalent rms value of alternating current (AC) having the same probability of inducting ventricular fibrillation.
K = I DC fibrillation / I AC fibrillation (rms).
K = 3000 mA / 100 mA
K = 30 mA
Threshold of let-go is unlike AC there is no definable threshold of let-go for DC for current magnitude below approximately 300 mA. Only the making and breaking of current leads to painful and cramp like contractions of muscles.
Above approximately 300 mA, let-go may be impossible or only possible after several seconds or minutes of shock duration. Below approximately 300 mA a sensation of warmth is felt in the extremities during the flow of current. Above 300 mA unconsciousness frequently occurs.
