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(Chest. 1968;53:93-98.)
© 1968 American College of Chest Physicians

Experimental and Clinical Use of a Variable Parameter Cardiac Pacer

Nicholas P. D. Smyth M.D., F.C.C.P.1; James M. Bacos M.D.2; and J. Walter Keller M.S.3

1 Department of Surgery, The Washington Hospital Center
2 Department of Medicine, The Washington Hospital Center
3 Cordis Corporation

Modifications in the structure and function of a variable parameter cardiac pacer are described in which:

1. A switch is added in the output circuit, providing a tenfold increase in sensitivity in experimental and clinical measurement of ventricular stimulating thresholds.

2. A transparent panel overlay is used during clinical pacing to neutralize experimental controls.

3. An indirect overdrive system is described in which the rate of a synchronous or standby pacer can be temporarily increased for either diagnostic or therapeutic purposes.






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Copyright © 1968 by the American College of Chest Physicians.