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Background Large discrepancies exist concerning the incidence of myocardial bridging. This has been reported to be 0·5%–2·5% following coronary angiography but 15%–85% following autopsy. The purpose of the study was to use intravascular ultrasound and intracoronary Doppler to study the morphology and flow characteristics of myocardial bridging in order to find feasible parameters of this syndrome.

Methods and Results Intravascular ultrasound was performed in 62/69 patients in whom typical angiographic ‘milking effects’ were present. In 48 patients, intracoronary Doppler was performed. A specific, echolucent ‘half moon’ phenomenon surrounding the myocardial bridge was found in all the patients. The thickness of the half moon area was 0·47±0·19mm in diastole and 0·52±0·23mm in systole. There was systolic compression of the myocardial bridge with a lumen reduction during …