Incidence and characteristics of transient St-segment elevation during transseptal puncture.

Purpose: Delineate retrospectively and prospectively the incidence and characteristics of transient ST-segment elevation during transseptal puncture.

Methods: The study retrospectively evaluated 307 patients from January 1, 2015, to December 31, 2017, and prospectively evaluated 231 patients from January 1, 2018, to July 31, 2019.

Results: The presence of ST-segment elevation was significantly higher in the prospective sample than in the retrospective sample (5.