<span class="word">The <span class="word">Impact <span class="word">of <span class="word">Coronary <span class="word">Artery <span class="word">Bypass <span class="word"><span class="changedDisabled">Grafting <span class="word">on <span class="word"><span class="changedDisabled">Respiratory <span class="word"><span class="changedDisabled">Function: <span class="word">A <span class="word">Systematic <span class="word">Review

Background: Cardiovascular diseases are the main cause of mortality and morbidity in Portugal, with coronary artery bypass grafting (CABG) being one of the most performed surgeries by cardiothoracic centers. After cardiac surgery, patients often experience a decrease in physical capacity, which results in an increased risk of mortality or hospitalization expenditures. The objective of this systematic review was to characterize changes in respiratory function in patients undergoing CABG. Methods: This systematic review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analysis. Web of Science, Pubmed, SCOPUS, and Sport Discus were searched using a predefined research strategy to identify relevant original studies published until August 2025. To be included, studies must have assessed adult patients submitted to CABG who evaluated the respiratory function before and after cardiac surgery. Studies that reported other types of cardiac surgery were excluded. The Risk of Bias in Non-randomized Studies-of-Exposure and the Cochrane risk-of-bias tool for randomized trials were used to analyse the risk of bias of the selected studies. Results: After screening 1184 potential articles, six studies met the inclusion criteria. Studies included participants with CABG (n=324), with a mean age ranging between 54.05 ± 13.6 and 67 ± 10 years. Conclusions: All included studies reported significant postoperative reductions in respiratory function following CABG in forced vital capacity, forced expiratory volume in one second, maximal inspiratory pressure and maximal expiratory pressure. This systematic review highlighted the decline in pulmonary function following CABG, supporting the clinical importance of monitoring these impairments to enhance health-related quality of life.