IJCS | Volume 32, Nº2, March/April 2019

DOI: 10.5935/2359-4802.20180092 104 ORIGINAL ARTICLE International Journal of Cardiovascular Sciences. 2019;32(2)104-109 Mailing Address: André Luiz Lisboa Cordeiro Rua Japão, 94. Postal Code: 44052-022, Caseb, Feira de Santana, BA - Brazil. E-mail: andrelisboacordeiro@gmail.com Behavior of Pulmonary Function after Hospital Discharge in Patients Submitted to Myocardial Revascularization André Luiz Lisboa Cordeiro, 1, 2 L etícia Gardênia Romualdo da Silva, 2 M ilena Oliveira Pinto, 2 J aclene da Silva Araújo, 2 André Raimundo Guimarães, 3 J efferson Petto 1,4,5, 6 Escola Bahiana de Medicina e Saúde Pública, 1 BA - Brazil Faculdade Nobre, 2 BA - Brazil Instituto Nobre de Cardiologia, 3 BA - Brazil Universidade Salvador, 4 BA - Brazil Faculdade Adventista da Bahia, 5 BA - Brazil Faculdade Social da Bahia, 6 BA - Brazil Manuscript received on June 03, 2018; reviewed on August 07,2018; accepted on August 20,2018. Abstract Background: Coronary artery bypass grafting (CABG) is a type of surgery where there is a compromise in one or more coronary arteries, with the objective of restoring function to the areas that have been compromised in the heart, possibly leading to respiratory compromise and postoperative complications. The return time of the pulmonary function to the preoperative condition is still indeterminate in the literature. Objective: To describe the behavior of pulmonary function after hospital discharge in patients submitted to CABG. Methods: This is a prospective cohort study. Only patients undergoing MRI, whose lung function was evaluated preoperatively, at hospital discharge and 30 days after surgery, were evaluated. This evaluation consisted of maximum inspiratory pressure (MIP) and expiratory (MEP), vital capacity (VC) and expiratory flow peak (EFP). Results: A total of 30 patients were evaluated, of which 18 (60%) were males, mean age 62 ± 9 years. A reduction in lung function from preoperative time to hospital discharge was observed in all variables. There was improvement in MIP (88 ± 9 vs 109 ± 5, p < 0.001), MEP (67 ± 10 for 90 ± 8, p < 0.001) and EFP (310 ± 59 for 390 ± 32, p < 0.001), high for review. At the time of the review, no variables returned to their preoperative value: MIP (116 ± 5 for 109 ± 5, p = 0.43), MEP (111 ± 8 for 90 ± 8, p < 0.001), VC (45 ± 12 for 39 ± 7, p = 0.33) and EFP (430 ± 40 for 390 ± 32, p < 0.001). Conclusion: It is concluded that MRI surgery reduces lung function and is not reestablished after 30 days of the procedure. Being the expiratory muscular force and the peak of expiratory flow the most affected. (Int J Cardiovasc Sci. 2019;32(2)104-109) Keywords: Cardiovascular Diseases/physiopathology; CoronaryArtery Bypass, Myocardial Infarction; Myocardial Revascularization; Patient Discharge. Introduction Coronary artery bypass grafting (CABG) is a type of cardiac surgery where one or more impaired coronary arteries receive saphenous or mammary grafts andwhose surgical goal is to reestablish a connection to areas that have been affected in the heart. Studies show that, in Brazil, in 2010, 21,000 coronary artery bypass grafting surgeries were performed and they have been some of the most performed cardiac procedures in recent years. 1 Coronary artery bypass grafting (CABG) improves the patients’ quality of life, but there are associated factors that may compromise respiratory function. There is a great chance that these patients will develop postoperative complications, including the following most common ones: pulmonary edema, pneumothorax, pleural effusion, atelectasis and pneumonia. 2 Pulmonary function is significantly reduced in the immediate postoperative period and the reason for this is multifactorial and is not fully understood. 3