Evaluation of maximal inspiratory and sniff nasal inspiratory pressures in pre- and postoperative myocardial revascularization Avaliação das pressões inspiratória máxima e inspiratória nasal sniff no pré e pós-operatório de revascularização do miocárdio

Objective: The objective of this study was to evaluate and correlate inspiratory muscle strength using maximal inspiratory pressure (MIP) and sniff nasal inspiratory pressure (Pnsn) in patients with coronary artery disease in pre- and postoperative of myocardial revascularization surgery. Methods: Thirty-eight men were studied, divided into a control group (CG) comprised of healthy individuals (n=18), age 55.52 ± 7.8 years and a myocardial revascularization group (MRG), comprised of patients with coronary artery disease submitted to myocardial revascularization (n=20), age 58.44 ± 9.3 years. All volunteers were submitted to MIP and Pnsn measurement, and the MRG was evaluated in the preoperative period and on the first postoperative day (PO1). Results: MRG presented MIP (80.60 ± 26.60 cmH 2 O) and Pnsn (74.70 ± 31.80 cmH 2 O) values inferior to CG (MIP: 112.22 ± 32.00 cmH 2 O; Pnsn: 103.70 ± 34.10 cmH 2 O), and there was significant reduction of these values on PO1 (MIP: 40.05 ± 15.70 cmH 2 O; Pnsn: 40.05 ± 16.60 cmH 2 O). There was correlation and concordance between evaluation methods in both groups studied, as well as in pre- and postoperative MRG conditions. Conclusions: The results showed that the studied patients presented reduced MIP and Pnsn pre- and post-operative myocardial revascularization. Also, the Pnsn correlated with MIP and can be considered suitable for assessing inspiratory muscle strength in this population. Descriptors: Myocardial revascularization. Muscle strength. Respiratory muscles. Coronary Artery Disease.