Surgical Treatment of Myocardial Bridging Causing Coronary Artery Obstruction

Abstract

Nine patients with obstruction of coronary artery blood flow caused by myocardial bridging underwent surgery after failure of medical treatment. The diagnoses were made angiographically at rest or during β-stimulation. Impaired blood flow was found only in the left anterior descending artery in seven patients and additionally in the diagonal branch in two. The operations, performed with cardiopulmonary bypass consisted of complete dissection of the overlying myocardium. All patients survived the operation. Major intraoperative complications were accidental opening of the right ventricle in two patients. Postoperative scintigraphic and angiographic studies demonstrated restoration of coronary flow and myocardial perfusion without residual myocardial bridges under β-stimulation. Surgical relief of myocardial ischemia due to systolic compression of intramyocar-dial coronary arteries can be accomplished with low operative risk and with excellent functional results.

Key Words:

• myocardial bridging
• coronary artery surgery