RECENT ADVANCEMENTS in power source and electronic technology havc increased the theoretical lifetimc of a pacemaker to 10-12 years. No longer is pacer failure the primary reason for removal. The heart lead interface and changes in the physiology of the patient have become the main causes for pacemaker explant. In the main, these problems are: intrinsic hcart rate of the patient changes, impedance built up at the heart lead interface causing loss of capture, and failure to sensc the electrical activity of the…
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