Chest pain associated with rate-related left bundle branch block and cardiac memory mimicking ischemia.

Background: Intermittent left bundle branch block (LBBB) has been linked to chest pain, and causes cardiac memory electrocardiographic (ECG) changes mimicking ischemia.

Purpose: To present a case of chest pain with ECG abnormalities suggestive of ischemia, both likely caused by LBBB.

Case: A 33-year-old hypertensive female evaluated for chest pain and LBBB by ECG was treated with lisinopril and metoprolol, and scheduled for stress testing.