Oversensing of transthoracic excitation stimuli in contemporary pacemakers

James D. Ryan, Nathan D. Tempel, Dean D. Engle, David L. Hayes, Yong-Mei Cha, Samuel J Asirvatham

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Background: Transthoracic impedance measurements (TIM) is primarily used for minute ventilation rate adaptive sensors in pacemakers. With elevated impedance, the TIM electrical signal itself is oversensed, causing device malfunction. Objective: We report an increased incidence of TIM oversensing. Method: Retrospective chart review. We review existing records of 18 patients who have demonstrated device malfunction with TIM oversensing. Results: We have found a 1.8% incidence of TIM-related oversensing in our patient population of 959 patients with contemporary Boston Scientific (Marlborough, MA, USA) pacemakers and cardiac resynchronization therapy pacemakers. One patient experienced a syncopal episode. Conclusion: Oversensing with pacing inhibition is apparent with the potential of adverse effects to patients.

Original languageEnglish (US)
JournalPACE - Pacing and Clinical Electrophysiology
StateAccepted/In press - Jan 1 2018


  • Minute ventilation
  • MV Chop
  • Oversensing
  • Pacemaker
  • Pacemaker complication
  • Rate-adaptive pacemaker
  • Transthoracic impedance measurement

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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