TRAN, M. V.; NGO, V. T.; NGUYEN, T. T.; NGUYEN, T. P.; HOANG, T. V. A.; TRUONG, Q. T.; TRUONG, Q. T. Assessment of sleep quality using the pittsburgh sleep quality index (psqi) in patients before cardiac surgery at Hanoi Heart Hospital. The Vietnam Journal of Cardiovascular and Thoracic Surgery, [S. l.], v. 52, p. 139 - 147, 2025. DOI: 10.47972/vjcts.v52i.1503. Disponível em: https://vjcts.vn/index.php/vjcts/article/view/1503. Acesso em: 17 may. 2026.