“…Intravascular ultrasound revealed a typical “halo” finding from the mid to distal LAD, confirming the presence of a long segment of an MB ( Figure 4 , Video 2 ). 3 , 4 During a spasm provocation test with intracoronary injection of incremental acetylcholine doses up to 100 μg, significant epicardial coronary artery spasm (CAS) was observed in the segment of the MB, with reproduction of his usual chest pain and ischemic electrocardiogram changes ( Figure 5 , Video 3 ). Figure 2 Coronary Angiogram Figure 3 Physiology Tracing: FFR/RFR and CFR/IMR CFR = coronary flow reserve; FFR = fractional flow reserve; IMR = index of microcirculatory resistance; RFR = resting full-cycle ratio.…”
“…Intravascular ultrasound revealed a typical “halo” finding from the mid to distal LAD, confirming the presence of a long segment of an MB ( Figure 4 , Video 2 ). 3 , 4 During a spasm provocation test with intracoronary injection of incremental acetylcholine doses up to 100 μg, significant epicardial coronary artery spasm (CAS) was observed in the segment of the MB, with reproduction of his usual chest pain and ischemic electrocardiogram changes ( Figure 5 , Video 3 ). Figure 2 Coronary Angiogram Figure 3 Physiology Tracing: FFR/RFR and CFR/IMR CFR = coronary flow reserve; FFR = fractional flow reserve; IMR = index of microcirculatory resistance; RFR = resting full-cycle ratio.…”
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