According to him, describing the relation of response to stimulus, An induction shock produces the muscle at the time . The individual fibers of both skeletal muscle and nerve respond to stimulation according to the all-or-none principle.
2.
For example, he described the technique of transthoratic pacing for transient bradycardia ( abnormally slow heartbeat ), and he proposed stimulating the heart during asystole ( cardiac arrest ) by causing artificial excitation with a series of induction shocks ( rather than using constant strong electric currents that could trigger fibrillation ).
3.
His description is as follows : " The ventricular muscle is thrown into a state of irregular arrhythmic contraction, whilst there is a great fall in the arterial blood pressure, the ventricles become dilated with blood as the rapid quivering movement of their walls is insufficient to expel their contents; the muscular action partakes of the nature of a rapid incoordinate twitching of the muscular tissue & The cardiac pump is thrown out of gear, and the last of its vital energy is dissipated in the violent and the prolonged turmoil of fruitless activity in the ventricular walls . " MacWilliam spent many years working on ventricular fibrillation and was one of the first to show that ventricular fibrillation could be terminated by a series of induction shocks through the heart.
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