Correlation of right ventricular multielectrode endocardial unipolar mapping and epicardial scar

Jonathan Chrispin, Ali R. Keramati, Fabrizio R. Assis, Satish Misra, Tarek Zghaib, Ronald D. Berger, Hugh Calkins, Harikrishna Tandri

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Aims: Prior studies identified a relationship between epicardial bipolar and endocardial unipolar voltage. Whether the relationship is valid with smaller multielectrode mapping catheters has not been reported. We explored the association of right ventricular (RV) endocardial unipolar voltage mapping with epicardial bipolar voltage mapping using a multielectrode mapping catheter. Methods: Electrograms from patients who underwent multielectrode endocardial and epicardial RV electroanatomical mapping during ablation procedures were analyzed. Each endocardial mapping point was matched to the corresponding nearest epicardial point. The correlation between unipolar endocardial voltage and epicardial bipolar voltage was determined. The optimal unipolar threshold to detect epicardial low voltage (< 1.0 mV) and dense scar (0.5 mV) was calculated. Results: A total of 4,895 points were analyzed. There was a significant correlation between endocardial unipolar and epicardial bipolar voltage (Spearman rho = 0.499, P = < 0.001). The extent of the correlation was inversely associated with wall thickness. The receiver operator characteristic analysis of endocardial unipolar voltage predicting epicardial bipolar voltage of < 1.0 mV and < 0.5 showed an area under the curve of 0.769 and 0.812, respectively. The endocardial unipolar voltage that had the highest sensitivity and specificity in detecting epicardial bipolar voltage of < 1.0 mV and < 0.5 mV was 3.3 mV (70.3% sensitivity, 70.3% specificity), and 2.8 mV (sensitivity 73.8%, specificity 73.3%), respectively. Conclusion: Epicardial low voltage of the RV can be assessed by unipolar endocardial voltage using small multielectrode catheters. The strength of the association was inversely correlated with the wall thickness.

Original languageEnglish (US)
Pages (from-to)345-352
Number of pages8
JournalPACE - Pacing and Clinical Electrophysiology
Issue number4
StatePublished - Apr 2018


  • endocardial electroanatomical mapping
  • epicardial electroanatomical mapping
  • multielectrode mapping
  • right ventricular scar
  • unipolar voltage

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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