The Variant Angina Korea (VA-KOREA) registry is a nationwide prospective multicenter registry designed to reflect the real-world clinical data of Korean patients with vasospastic angina (VSA). A total of 2,960 patients with chest pain and presumed VSA who underwent coronary angiography (CAG) and an ergonovine provocation test were enrolled. The primary endpoint composite of death from any cause, acute coronary syndrome, and newonset symptomatic arrhythmia during the 3-year follow-up was investigated for patient characteristics, laboratory findings, CAG findings, and medications. This article reviewed the current status of VSA in Korea and new findings from VA-KOREA registries to improve the treatment and prognosis of patients with VSA.
Background The aim of this multi-center prospective registry study was to evaluate the clinical efficacy of low-dose aspirin in vasospastic angina (VA) patients for the prevention of future cardiovascular events.
Methods A total of 1,717 patients with positive and intermediate results of an intracoronary ergonovine provocation test in the VA in Korea registry (n=2,960) were classified into 100 mg/day aspirin intake (aspirin, n=743) and no-aspirin intake (control, n=974) groups. The primary end-point was a composite of major adverse cardiac events (MACEs) including cardiac death, new-onset arrhythmia, and acute coronary syndrome.
Results The median follow-up duration was 2.0 years (25–75th, interquartile range 0.9–3.0 years). Cumulative composite MACE in the propensity score matched-pair cohort (n=1,028) was 3.6%. There was no significant difference in composite MACE between the aspirin and control groups (3.1% vs. 4.1%; hazard ratio [HR], 1.18; 95% confidence interval [CI], 0.61–2.26; p=0.623). A sensitivity analysis of only the VA-positive population showed these results to be consistent. Even for patients with minimal organic stenosis (n=369), aspirin usage was not related to the incidence of a composite MACE (HR, 1.61; 95% CI, 0.55–4.72; p=0.380).
Conclusions Low-dose aspirin does not protect against future cardiovascular events in VA patients, even patients who combine with minimal coronary artery stenosis.
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