Disappearance of muscle bridge of left anterior descending artery after rising blood pressure

A 62 years-old woman with chief complaint of repeated compressive chest pain on physical activity presented to the emergency department. Angiography showed narrowing of mid part of left anterior descending artery at systole, normal caliber in diastole and good distal flow but after normalization of blood pressure and pulse rate, the left anterior descending artery lesion disappeared in systole and diastole. As in this patient, it is imperative to note that hypotension due to any cause such as vasovagal reaction, could stimulate myocardial bridge