Unknown QRS Morphology Change at Peak Exercise: To Stop or to Continue?

Fabio M Leonelli; Daniel Sun; Stephanie Gonzalez; Rejoy Sabin Thomas; Maqsood A Siddique

doi:10.1016/j.jaccas.2023.101951

Unknown QRS Morphology Change at Peak Exercise: To Stop or to Continue?

JACC Case Rep. 2023 Aug 22:22:101951. doi: 10.1016/j.jaccas.2023.101951. eCollection 2023 Sep 20.

Authors

Fabio M Leonelli^{1

2}, Daniel Sun^{1

2}, Stephanie Gonzalez^{1

2}, Rejoy Sabin Thomas^{1

2}, Maqsood A Siddique¹

Affiliations

¹ James A. Haley Veterans' Hospital, Tampa, Florida, USA.
² Tampa Veterans Affairs Clinical Research and Education Center, Tampa, Florida, USA.

Abstract

Electrocardiogram changes during stress tests are well standardized and understood. We present and explain a reversible QRS morphology change at peak exercise previously unreported. (Level of Difficulty: Intermediate.).

Keywords: exercise stress test; left septal fascicle block; septal depolarization.