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(Chest. 1974;66:418-420.)
© 1974 American College of Chest Physicians

Myopotential Inhibition of Demand Pacemakers

L. W. Piller F.S.C.T.1 and B. M. Kennelly M.B., Ch.B.2

1 Chief Technologist, Cardiac Clinic, Groote Schuur Hospital and Department of Medicine, University of Cape Town, Cape Town, South Africa
2 Cardiac Clinic, Groote Schuur Hospital and Department of Medicine, University of Cape Town, Cape Town, South Africa

This report of 20 patients who have R-wave inhibited demand pacemakers, 19 of which are titanium-screened, connected to unipolar electrode systems, suggests that there is a significant incidence of myopotential inhibition. It is therefore possible that considerably more patients may experience fleeting muscular inhibition than is generally believed, particularly in the younger, more active age group. It is worthy of note, that on no occasion did any of the pacemakers in question revert to an asynchronous mode of operation when myopotential inhibition was provoked.

Submitted on October 16, 1974
Accepted on March 28, 1974






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Copyright © 1974 by the American College of Chest Physicians.