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Abstract
1. Four applications of stimulating waveforms, cathodal and anodal unidirectional current (UDC) and two types of alternating bidirectional current (ABDC-1 and -2), were evaluated for effectiveness for long-term stimulation. 2. The decrease in tidal volume was significantly greater with cathodal UDC and ABDC-2 stimulation than with ABDC-1 stimulation in both short- and long-term experiments with anesthetized dogs. 3. The decrease in tidal volume with cathodal UDC stimulation was only temporarily restored to control levels when the stimulation was changed to a new site lower on the nerve. 4. Phrenic nerve action potentials decreased significantly following cathodal UDC stimulation. However, this decrease was temporarily reversed by anodal UDC stimulation. ABDC-1 stimulation did not affect nerve action potentials during the stimulation period. 5. Over a 24-hr period there was no change in tidal volume using ABDC-1 stimulation, whereas using UDC cathodal stimulation there was marked decrease. 6. ABDC-1 stimulation required less electricity and energy developed at threshold than cathodal UDC stimulation. 7. We conclude that fatigue accompanying long-term electrophrenic respiration may be postponed by employing an alternating bidirectional symmetrical waveform.
Published Version
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