Mechanisms of the Spatial Distribution of QT Intervals on the Epicardial and Body Surfaces

摘要: Spatial Distribution of the QT Interval. Introduction: The role dispersion as a predictor arrhythmia vulnerability has not been consistently confirmed in literature. Therefore, it is important to identify electrophysiologic mechanisms that affect duration and distribution. We compared spatial distributions intervals (QTI) with potential on cardiac body surfaces recovery times surface. hypothesized measure QTI affected by presence zero line distribution, well sequence recovery. also investigated use STT area possible indicator surface. Methods Results: High-resolution potentials were determined surface human subjects torso-shaped tank containing an isolated canine heart. Additionally, QTI, times, areas exposed hearts. Unipolar electrograms recorded during atrial ventricular pacing for normal hearts cases myocardial infarction. Regions shortest always coincided location surfaces. On surface, regions away from line, similarities observed between patterns highly correlated surface. Conclusion: robust index local time position which unrelated times. However, some may help explain frequently reported predictive value dispersion. Preliminary results indicate be better epicardium than QTI.