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European Heart Journal 1983 4(10):724-727;
Copyright © 1983 by the European Society of Cardiology.
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© 1983, by the European Society of Cardiology

Suppression of demand pacemakers due to spurious signals generated by inactive endocardial electrodes

G. ORETO, O. BRAMANTI, F. ARRIGO, S. CARERJ and F. CONSOLO

Clinica Medica I—Université di Messina Messina, Italy

Received 25 October 1982; revised 20 January 1983; .

Address far reprints: Giuseppe Oreto, Clinica Medica 1, Policlinico Universitario, 98100 Messina, Italy

Abstract

We report a case of oversensing observed in a patient with a VVI pacemaker. This phenomenon was provoked by an inactive lead whose tip was in close apposition with the tip of the stimulating electrode. Potentials of large amplitude arose from the contact between these two catheters, causing pacer suppression. These false signals have been revealed both by intracavitary recordings and by standard ECG. In the latter they assumed a P-like shape. Withdrawal of the temporary lead restored normal pacing.

Key Words: Pacemaker inhibition • oversensing • spurious potentials


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