Declaration of interest
The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.
Supplemental files
Video 1. Prominent jugular venous pulsations consistent with cannon A-waves were seen prior to and following the right heart catheterization while the patient was being paced asynchronously in the ventricle.
Video 2. Resolution of cannon A-waves after epicardial ventricular pacing was discontinued and atrioventricular synchrony was restored.