Ronald S. Pennock, M.D.; Leonard S. Dreifus, M.D.; Yoshio Watanabe, M.D.; Dryden Morse, M.D.
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At present, permanent cardiac pacemakers are electively replaced after 18 months. Some generators have failed earlier, and thus far no foolproof system can predict impending failure. A new system was developed to monitor the pulse interval to ±0.1 msec, utilizing the electronic R-R signal that is transmitted over ordinary telephone lines by a data coupler to the pacemaker clinic. After pacemaker implantation a base line is established over a 3-week period. The unit is tested monthly for 1 year. Pacemakers with an interval drift of more than ±20 msec in 1 month are then tested weekly until predicted failure (±15
Pennock RS, Dreifus LS, Watanabe Y, et al. Comprehensive Evaluation of Cardiac Pacemakers.. Ann Intern Med. 1971;74:820–821. doi: 10.7326/0003-4819-74-5-820_6
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Published: Ann Intern Med. 1971;74(5):820-821.
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