Dose maximal acetylcholine dose into the left coronary artery affect the positive provoked spasm in the left circumflex artery

BackgroundPositive provoked spasm in the left circumflex artery (LCX) is lower than that in the left anterior descending artery and right coronary artery (RCA).Patients and methodsWe examined the provoked positive spasm in the LCX between the maximal acetylcholine (ACh) 100 μg period (January 1991 t