The QT Interval as a Noninvasive Marker of Atrial Refractoriness

Kaylin T. Nguyen, Rachel A. Gladstone, Jonathan W. Dukes, Babak Nazer, Eric Vittinghoff, Nitish Badhwar, Vasanth Vedantham, Edward P. Gerstenfeld, Byron K. Lee, Randall J. Lee, Zian H. Tseng, Jeffrey E. Olgin, Melvin M. Scheinman, Gregory M. Marcus

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Background: Atrial refractoriness may be an important determinant of atrial fibrillation (AF) risk, but its measurement is not clinically accessible. Because the QT interval predicts incident AF and the atrium and ventricle share repolarizing ion currents, we investigated the association between an individual's QT interval and atrial effective refractory period (AERP). Methods: In paroxysmal AF patients presenting for catheter ablation, the QT interval was measured from the surface 12-lead electrocardiogram. The AERP was defined as the longest S1–S2 coupling interval without atrial capture using a 600-ms drive cycle length. Results: In 28 patients, there was a positive correlation between QTc and mean AERP. After multivariate adjustment, a 1-ms increase in QTc predicted a 0.70-ms increase in AERP. Conclusions: The QTc interval reflects the AERP, suggesting that the QTc interval may be used as a marker of atrial refractoriness relevant to assessing AF risk and mechanism-specific therapeutic strategies.

Original languageEnglish (US)
Pages (from-to)1366-1372
Number of pages7
JournalPACE - Pacing and Clinical Electrophysiology
Issue number12
StatePublished - Dec 1 2016


  • QT interval
  • atrial fibrillation
  • refractory period

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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