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P Wave Tracking Above the Maximum Tracking Rate in a DDDR Pacemaker
Author(s) -
HIGANO STUART T.,
HAYES DAVID L.
Publication year - 1989
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1989.tb01924.x
Subject(s) - medicine , tracking (education) , cardiology , control theory (sociology) , ventricular rate , atrial fibrillation , artificial intelligence , computer science , pedagogy , control (management) , sinus rhythm , psychology
Dual‐chamber, rate‐modulated pacemakers have recently become available. These devices, whose rate response is determined by the combined input from the intrinsic atrial rate and the sensor‐driven rate, have led to some unexpected upper rate behaviors. In the case presented, with the maximum sensor pacing rate at 150 ppm, multiple episodes of apparent P wave tracking occurred above the maximum P wave iracking rate of 100 ppm. This behavior is explained by P waves thai inhibit sensor‐driven atrial output; inhibition may result in variable maximum tracking rates that are equal to the current sensor‐driven rate. This effect appears to have minimal physiological consequence. Its importance lies in its recognition as normal DDDR function so that searches for pacemaker malfunction will not be made.