Three-year follow-up of patients with acetylcholine-induced coronary artery spasm combined with insignificant coronary stenosis

Background: Coronary artery spasm (CAS) and significant coronary stenosis are known to be major causes of myocardial ischemia. However, their association and the impact of insignificant coronary stenosis (ICS) on long-term clinical outcomes of CAS patients are largely unknown. Methods: A total of 2797 patients without significant coronary artery disease (CAD) who underwent the acetylcholine (ACH) provocation test between November 2004 and October 2010 were enrolled. Significant CAS was defined as having >= 70% of temporary narrowing by ACH test and ICS as having <70% of fixed stenosis on angiography. Patients were divided into two groups: ICS group (n- 764) and non-ICS group (n- 845). To adjust potential confounders, a propensity score matching (PSM) analysis was performed using the logistic regression model. Primary endpoint was the composite of total death, myocardial infraction (MI), de novo percutaneous coronary intervention (PCI), and cerebrovascular accidents (CVA). Secondary endpoint was the incidence of recurrent angina requiring repeat coronary angiography (CAG) at 3 years. Results: After PSM analysis, two well-balanced groups (548 pairs, total = 1096) were generated. The baseline clinical characteristics were similar between the two groups. During the ACH test, compared with the non-ICS group, the ICS group had smaller spastic narrowing diameter (0.69 +/- 0.35 vs. 0.73 +/- 0.37, P = 0.039) and incidence of ST-segment depression (4.0% vs. 0.9%, P = 0.001). The incidence of primary and secondary endpoints was similar between the two groups up to 3 years. Conclusions: Although, the ICS group was expected to havemore adverse long-termclinical outcomes, itwas not associatedwith the increased incidence ofmajor adverse clinical outcomes comparedwith the non-ICS group up to 3 years. Longer term follow-up studies are needed. (C) 2017 Elsevier B. V. All rights reserved.