Comprehensive Evaluation of Cardiac Pacemakers. | Annals of Internal Medicine | American College of Physicians
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
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