Prospective study for evaluating coronary microvascular dysfunction in patients with vasospastic angina - Prospective study for evaluating coronary microvascular dysfunction in patients with vasospastic angina

Patients with VSA had a significantly lower reactive hyperemia index compared with those without VSA. Coronary flow reserve, index of microcirculatory resistance, and hyperemic Tmn were not different between the two groups, whereas resting Tmn was significantly longer in patients with VSA. Although the frequency and severity of angina improved from baseline to 1 and 3 months in patients with both positive and negative ACh tests, there was no difference between the two groups.