ABSTRACT
Patients formerly diagnosed with unstable angina (UA) are being reclassified as non-ST-elevation myocardial infarction with the widespread adoption of high-sensitivity troponin (hsTn) assays, leading to significant changes in the incidence and prognosis of UA. This study aimed to evaluate the value of hsTn and the presence of significant obstructive coronary artery disease (CAD) in the risk stratification of patients with UA. We conducted a retrospective, single-center study of 742 patients hospitalized for UA between 2016 and 2021. The primary end point of this study was all-cause mortality. The secondary outcome (major adverse cardiac events [MACEs]) was defined as a composite of nonfatal myocardial infarction (MI), hospitalization for heart failure (hHF), and repeated coronary angiography because of recurring UA (rUA) after the index event. The outcomes were assessed within 1 month, 1 year, and up to 5 years of follow-up. The average follow-up duration was 45 ± 24 months, and 37.2% (n = 276) of patients completed a 5-year follow-up. No in-hospital death was observed, and 6.9% of patients died during follow-up, which was more commonly a late event (>12 months). The composite secondary end point (MI+hHF+rUA) was observed in 16.7% of the patients. There were 3.2% nonfatal MI, 2.3% hHF, and 11.6% rUA during follow-up. We developed a risk model (UA mortality risk) using variables with the highest discriminatory power: age, hsTn, and ST-segment deviation. Our model performed well against the Global Registry of Acute Coronary Events and Thrombolysis in Myocardial Infarction risk scores in predicting death during follow-up. Obstructive CAD on coronary angiography was the only independent predictor of MACEs during follow-up. In conclusion, a contemporary cohort of patients with UA presented with favorable prognosis, particularly, within the first year after the index event. Nonsignificant increases in hsTn levels add to the risk stratification of patients with UA, and the presence of obstructive CAD was the only independent predictor of MACEs, highlighting the potential importance of assessing coronary anatomy.
ABSTRACT
A 56-year-old female patient was referred to our institution for atypical chest pain and palpitations. Physical examination, resting ECG and transthoracic echocardiogram were unremarkable. Stress perfusion scintigraphy was positive for anterior and apical myocardial ischaemia. A subsequent coronary angiogram showed no signs of atherosclerotic coronary artery disease; however, it revealed a coronary arteriovenous fistula and multiple other fistulous connections between the proximal segment of the left coronary artery and the pulmonary artery trunk. We present a rare case of a symptomatic coronary fistula that was percutaneously closed using an Amplatzer Vascular Plug, which resulted in clinical improvement and late fistula occlusion. This case report underlines the importance of thinking beyond atherosclerosis in the evaluation of chest pain syndromes. Moreover, it describes some of the angiogram caveats in assessing the coronary fistula number and morphology, as well as the cardiac-catheter potential for multiple pathway coronary artery fistulae closure.
