Background:Obesity is characterized by excessive accumulation of body fat, which causes
damage to the health of individuals, such as breathing difficulties. Aim:To verify the results of non-invasive ventilation as a preventive strategy on
the decline of respiratory function and postoperative complications in
patients undergoing Roux-en-Y gastric bypass. Methods:This is a randomized trial, according to CONSORT standards, with obese adults
aged 18-40 years. Randomized control group (n=25) only received guidelines
regarding posture, early ambulation and cough stimuli, and in the NIV group
(n=25), in addition to the aforementioned group, non-invasive ventilation
was performed with two pressure levels, once day for 60 min, from the
1st to the 3rd postoperative day (POD). Both
groups were evaluated in the preoperative period and in the 1st
and 3rd POD for respiratory function, which were: slow vital
capacity (VC), inspiratory capacity (IC), minute volume (MV), tidal volume
maximal inspiratory muscle strength (Pimax) and peak expiratory flow (PEF).
The length of hospital stay and the episodes of postoperative complications
were recorded. Results:Of the 50 patients the majority were young adults with degrees of obesity
between III and IV. In the intergroup analysis, there was an improvement in
the CVL and MV only in the 1st POD in the NIV group, CI in the
three moments evaluated in the NIV group and the PFE in the 1st
and 3rd PDO also in this group. The most frequent complications
were pneumonia, followed by operative wound infection and atelectasis. There
was a significant difference between groups, showing a higher occurrence in
pneumonia and atelectasis in the control group. The days of hospitalization
and intensive care unit were similar. Conclusion:It was observed a faster recovery until the 3rd POD in the IC and
PEF variables in the NIV group; in addition, there were fewer complications
in this group.