Fluctuations of high voltage impedance

Paul A. Friedman, Charles D. Swerdlow

Research output: Chapter in Book/Report/Conference proceedingChapter


A 59-year-old man with ischemic cardiomyopathy had a single-chamber Medtronic Entrust™ ICD and Sprint Fidelis™ Model 6949 dual-coil true bipolar lead implanted over 2 years ago after out-of-hospital VF. His NYHA Class is III and left ventricular ejection fraction is 34%. After an episode of monomorphic VT storm a year ago, he has been treated with amiodarone 200 mg per day to decrease the frequency of VT. He now presents for a routine follow-up visit. The pacing threshold is 0.5 V at 0.4 ms, and the pacing lead impedance is stable at 560 Ω. One episode of device-detected VT is stored in the ICD. Diagnosis and management steps are discussed.

Original languageEnglish (US)
Title of host publicationCardiac Electrophysiology
Subtitle of host publicationClinical Case Review
PublisherSpringer International Publishing
Number of pages5
ISBN (Electronic)9783030285333
ISBN (Print)9783030285319
StatePublished - Jan 1 2020


  • Amiodarone
  • Cardiomyopathy
  • ICD

ASJC Scopus subject areas

  • Medicine(all)


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