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Pressure curves of a representative case of patients with a myocardial bridge (MB). The red curve shows the aortic pressure, and the yellow curve shows the coronary pressure within the MB. Both pressures are similar at baseline; however, coronary systolic pressure increases with stress, whereas diastolic pressure decreases compared with aortic pressure. Diastolic fractional flow reserve equals diastolic coronary pressure divided by diastolic aortic pressure.
