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ST Segment Alternans During Percutaneous Transluminal Coronary Angioplasty—A Case Report

First Department of Internal Medicine, Faculty of Medicine, Mie University, Mie, Japan

Masaaki Inden

First Department of Internal Medicine, Faculty of Medicine, Mie University, Mie, Japan

Tokuji Konishi

First Department of Internal Medicine, Faculty of Medicine, Mie University, Mie, Japan

Takeshi Nakano

First Department of Internal Medicine, Faculty of Medicine, Mie University, Mie, Japan

The occurrence of electrical alternans of the ST segement has been reported in patients with variant angina. The authors encountered a patient with typical electrical alternans of the ST segment in leads V4 through V6, which developed during percutaneous transluminal coronary angioplasty (PTCA) of the proximal left anterior descending artery. Hemodynamic pulsus alternans of the aortic pressure tracing was not observed during electrical alternans, and a Ca²⁺ blocker could not prevent this phenomenon during PTCA.

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