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January 29, 1973

Implanted Bipolar PacemakersAnalysis of Function

Author Affiliations

From the Department of Medicine and the C.V. Richardson Laboratory, University of North Carolina School of Medicine, Chapel Hill.

JAMA. 1973;223(5):505-511. doi:10.1001/jama.1973.03220050015004

One hundred five pacemakers with bipolar electrodes have been observed in a pacemaker clinic serving a rural population. Pacemaker stimulus wave-form analysis and electronic stimulus interval counting were employed. Also, in selected cases, radiographic analysis of battery depletion was performed. Results show that a 1% increase in pacemaker rate is an accurate predictor of impending failure in units that are designed to undergo a rate change with battery depletion, and that radiography is helpful in cases of doubt. Wave-form analysis was useful only when other factors were unequivocally abnormal because of difficulty in standardizing the test.