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Apparent Undersensing Due to Oversensing of Low Amplitude Pulses in a Thoracic Impedance‐Sensing, Rate‐Responsive Pacemaker
Author(s) -
WILSON JOHN H.,
LATTNER STEPHEN
Publication year - 1988
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.1540-8159.1988.tb04997.x
Subject(s) - medicine , cardiology , amplitude , electrical impedance , sensitivity (control systems) , electrical engineering , electronic engineering , optics , physics , engineering
A case in which apparent undersensing was caused by detection of low amplitude impedance‐measuring pulses emitted by a thoracic impedance‐sensing rate‐modulated pacemaker is described. The detection of these high frequency pulses was interpreted as “noise” by the pacemaker and led to asynchronous pacing in the interference reversion mode. Increasing the sensitivity /ailed to correct the problem. Decreasing the sensitivity eliminated oversensing of the low amplitude pulses and the apparent undersensing. Recognition of (his phenomenon is important to prevent a misdiagnosis of undersensing.