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Hung Manh Pham,1,2 Anh Phuong Nguyen,1,2 Huong Thi Thu Nguyen,3,4 Tam Ngoc Nguyen,3,4 Thanh Xuan Nguyen,3,4 Thu Thi Hoai Nguyen,3,4 Huong Thi Thanh Nguyen,5,6 Anh Trung Nguyen,3,4 Quang Ngoc Nguyen,1,2 Giang Song Tran,1 Huyen Thi Thanh Vu3,4 1Vietnam National Heart Institute, Bach Mai Hospital, Hanoi, 100000, Vietnam; 2Department of Cardiology, Hanoi Medical University, Hanoi, 100000, Vietnam; 3Department of Geriatrics, Hanoi Medical University, Hanoi, 100000, Vietnam; 4Scientific Research Department, National Geriatric Hospital, Hanoi, 100000, Vietnam; 5Physiology Department, Hanoi Medical University, Hanoi, 100000, Vietnam; 6Dinh Tien Hoang Institute of Medicine, Hanoi, 100000, VietnamCorrespondence: Anh Phuong Nguyen, Vietnam National Heart Institute, Bach Mai Hospital, Hanoi, 100000, Vietnam, Tel +84 989314464, Email npa6@bachmai.edu.vn

Hung Manh Pham,1,2 Anh Phuong Nguyen,1,2 Huong Thi Thu Nguyen,3,4 Tam Ngoc Nguyen,3,4 Thanh Xuan Nguyen,3,4 Thu Thi Hoai Nguyen,3,4 Huong Thi Thanh Nguyen,5,6 Anh Trung Nguyen,3,4 Quang Ngoc Nguyen,1,2 Giang Song Tran,1 Huyen Thi Thanh Vu3,4 1Vietnam National Heart Institute, Bach Mai Hospital, Hanoi, 100000, Vietnam; 2Department of Cardiology, Hanoi Medical University, Hanoi, 100000, Vietnam; 3Department of Geriatrics, Hanoi Medical University, Hanoi, 100000, Vietnam; 4Scientific Research Department, National Geriatric Hospital, Hanoi, 100000, Vietnam; 5Physiology Department, Hanoi Medical University, Hanoi, 100000, Vietnam; 6Dinh Tien Hoang Institute of Medicine, Hanoi, 100000, VietnamCorrespondence: Anh Phuong Nguyen, Vietnam National Heart Institute, Bach Mai Hospital, Hanoi, 100000, Vietnam, Tel +84 989314464, Email npa6@bachmai.edu.vnPurpose: The aim of this study was to explore the impact of frailty on in-hospital adverse outcomes and net adverse clinical events (NACE) in older patients with acute coronary syndrome.Patients and Methods: This observational study included elderly patients (≥ 60 years old), diagnosed with acute coronary syndrome (ACS) at admission from February 2021 to August 2021. The primary outcome was net adverse clinical events (NACE) defined as a composite of all-cause mortality, stroke, and major bleeding. Secondary outcome was in-hospital adverse outcomes including arrhythmia, acquired pneumonia, stroke, major bleeding, and all-cause mortality. Frailty was assessed using the Frail scale (FS). Data about socio-demographics, comorbidities, body mass index, ACS type, coronary angiography, left ventricular ejection fraction, and length of hospital stay were also collected. Univariate and multivariate logistic regressions were employed to identify the potential association between frailty and outcomes.Results: Of the 116 ACS patients, 38 patients were frail (32.76%). Frail subjects were more often female (50%) and older (p < 0.01) and ha