Chest
Laboratory and Animal InvestigationsExercise-Induced Ventricular Tachycardia in Association with a Myocardial Bridge
Section snippets
CASE REPORT
A 41-year-old man presented with atypical chest discomfort. He is a nonhypertensive, nondiabetic who was referred for a stress test shortly after his mother underwent percutaneous transluminal coronary angioplasty (PTCA) of a tight proximal left anterior descending (LAD) artery lesion. The patient exercised to stage 5 of a Bruce protocol when significant flat ST depressions consistent with ischemia developed. A wide complex tachycardia then developed in the patient at a rate of 280 beats per
DISCUSSION
The congenital anomaly of a partial intramyocardial course of the LAD artery was first described by Crainicianu4 in 1922. Portsmann and Iwig5 first described systolic compression of a coronary artery on angiogram in 1960. In 1976, Noble et al6 described the physiologic effect of this anomaly. Severe systolic compression was shown to cause ischemia during rapid heart rates as myocardial lactate production, ST depressions, and angina were induced during atrial pacing.6 Shortly thereafter, there
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Clinical significance and characteristics of exercise-induced ventricular tachycardia
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