IJCS | Volume 32, Nº6, November / December 2019

571 Table 5 - Early postoperative outcomes in transfused and non-transfused patients Outcome Non-transfused (N = 171) Mean ± SD or N (%) Transfused (N = 100) Mean ± SD or N (%) p value Acute myocardial infarction 1 (0.6%) 3 (3%) 0.288 Delirium 10 (6%) 18 (18%) 0.003 Stroke or transient ischemic attack 3 (1.8%) 8 (8%) 0.029 Prolonged mechanical ventilation (≥ 24h) 4 (2.4%) 23 (23%) < 0.001 Bronchopneumonia 2 (1.2%) 16 (16%) < 0.001 Acute renal failure 6 (3.5%) 25 (25%) < 0,001 Acute chronic kidney disease 1 (0.6%) 8 (8%) < 0.001 New atrial fibrillation 27 (15.8%) 18 (18%) 0.759 Intensive care unit stay (days) 3.8 ± 3 7 ± 9 < 0.001 Hospital length of stay (days) 8 ± 4 16 ± 15 < 0.001 Other infections 14 (8.2%) 11 (11%) 0.57 Death 3 (1.8%) 15 (15%) < 0.001 M: mean; SD: standard deviation; independent samples t-test for continuous variables and chi-square test for categorical variables. 1. Hutton B, Fergusson D, Tinmouth A, McIntyre L, Kmetic A, Hébert PC. Transfusion rates vary significantly amongst Canadian medical centers. Can J Anaesth. 2005;52(6):581-90. 2. Ferraris VA. Blood transfusion in cardiac surgery: who should get transfused? Lancet Haematol. 2015;2(12):e510-1. 3. Stover EP, Siegel LC, Parks R, Levin J, Body SC, Maddi R, et al. Variability in transfusion practice for coronary artery bypass surgery persists despite national consensus guidelines: a 24-institution study: Institutions of the Multicenter Study of Perioperative Ischemia Research Group. Anesthesiology. 1998;88(2):327-33. 4. Moise SF, Higgins MJ, Colquhoun AD. A survey of blood transfusion practice in UK cardiac surgery units. Crit Care. 2001;5(Suppl A):5. 5. Likosky DS, Zhang M, Paone G, Collins J, DeLucia A 3rd, Schreiber T, et al. Impacto of institucional culture on rates of transfusions during cardiovascular procedures: The Michigan experience. Am Heart J. 2016 Apr;174:1-6. 6. Vonk AB, Meesters MI, van Dijk WB, Eijsman L, Romijn JW, Jansen EK, et al. Ten-year patterns in blood product utilization during cardiothoracic surgerywith cardiopulmonary bypass in a tertiary hospital. Transfusion. 2014;54(10 Pt 2):2608-16. 7. Surgenor SD, DeFoe GR, Fillinger MP, Likosky DS, Groom RC, Clark C, et al. Intraoperative red blood cell transfusion during coronary artery bypass graft surgery increases the risk of postoperative low-output heart failure. Circulation. 2006;114(1 Suppl):I43-8. 8. Likosky DS, Paone G, ZhangM, Rogers MA, Harrington SD, Theurer PF, et al. Red blood cell transfusions impact pneumonia rates after coronary artery bypass grafting. Ann Thorac Surg. 2015;100(3):794-800. 9. Hajjar LA, Vincent JL, Galas FR, Nakamura RE, Silva CM, Santos MH, et al. Transfusion requirements after cardiac surgery: the TRACS randomized controlled trial. JAMA. 2010;304(14):1559-67. 10. Murphy GJ, Pike K, Rogers CA, Wordsworth S, Stokes EA, Angelini GD, et al. Liberal or restrictive transfusion after cardiac surgery. N Engl J Med. 2015;372:997-1008. References Tagliari et al. Blood transfusion in cardiovascular surgery Int J Cardiovasc Sci. 2019;32(6):565-572 Original Article Sources of Funding There were no external funding sources for this study. Study Association This study is not associated with any thesis or dissertation work. Ethics approval and consent to participate This study was approved by the Ethics Committee of the Hospital de Clínicas de Porto Alegre under the protocol number 15-0332. All the procedures in this study were in accordance with the 1975 Helsinki Declaration, updated in 2013. Informed consent was obtained from all participants included in the study.