JAMA Internal Medicine

An Ominous Wave

This case report describes a man in his 40s with evidence of malignant J wave syndrome on electrocardiography.

Postexercise Cardiac Asystole

This case report describes a patient in their 40s with hypertension who exhibited presyncopal symptoms following an exercise test.

ST-Segment Elevation in a Woman With Out-of-Hospital Cardiac Arrest

This case report describes a patient in their mid 70s who had an out-of-hospital cardiac arrest and was found to have irregular, narrow atrial fibrillation with rapid ventricular rhythm on electrocardiography imaging.