Myocardial electrical impedance responds to ischemia and reperfusion in humans

Roger Dzwonczyk, C. Del Rio, D. A. Brown, R. E. Michler, R. K. Wolf, M. B. Howie

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


Myocardial electrical impedance (MEI) is correlated to ischemia and reperfusion of the heart muscle. The entire body of work with MEI to this point has been carried out in nonhuman animal subjects and excised tissue samples. In this study we measured MEI clinically for the first time in human patients who were undergoing off-pump coronary artery bypass (OPCAB) surgery. Our patient population had a 70-100% stenosis of the coronary artery targeted for bypass. We measured MEI continuously during surgery and at 3, 6, 24 and 72hrs postop from two temporary pacing electrodes attached to heart. MEI increased with occlusion of the diseased artery prior to bypass. The percent increase from baseline was correlated to the percent stenosis of the artery. MEI decreased below baseline immediately on reperfusion following bypass and continued decreasing over the measurement period. MEI is a reliable clinical indicator of ischemia and reperfusion in humans.

Original languageEnglish (US)
Pages (from-to)541-543
Number of pages3
JournalComputers in Cardiology
StatePublished - 2002
Externally publishedYes
EventComputers in Cardiology 2002 - Memphis, TN, United States
Duration: Sep 22 2002Sep 25 2002

ASJC Scopus subject areas

  • Computer Science Applications
  • Cardiology and Cardiovascular Medicine


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