Potential mapping in septal tachycardia: Evaluation of a new intraoperative mapping technique

J. S. Tweddell, B. H. Branham, A. Harada, C. M. Stone, C. K. Rokkas, R. B. Schuessler, J. P. Boineau, James Lewis Cox

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


A recently developed computer program is capable of rapidly (<5 minutes) constructing a series of potential-distribution maps (PDMs) for every msec of a 4-second window of ventricular tachycardia (VT). This study was performed to assess the ability of a series of PDMs to localize the site of earliest activation of VT originating in the interventricular septum. In 12 dogs, 13 morphologies of VT were initiated with programmed electrical stimulation 3-6 days after anterior septal coronary artery infarction. VT was mapped with endocardial and epicardial unipolar electrodes with a multipoint, computer-assisted mapping system. PDMs were compared with activation-time maps, and the former correctly identified the site of earliest activation of all 13 VT morphologies. When PDMs were viewed in sequence on a computer monitor, the site of earliest activation was signaled by abrupt development of a negative potential of less than -3.0 mV. The initial negative point subsequently expanded, and the spread of this negative-potential field correlated with activation sequence. PDMs provide an accurate, unambiguous, rapid means of analyzing large numbers of electrograms acquired with multipoint, computer-assisted mapping systems.

Original languageEnglish (US)
Pages (from-to)I97-I108
Issue number3 SUPPL. I
StatePublished - 1989

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)


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