Noninvasive ventilation in the immediate postoperative of gastrojejunal derivation with Roux-en-Y gastric bypass.
BACKGROUND
Morbidly obese patients develop more atelectasis during general anesthesia than non-obese ones, and these atelectasis persist for 24 hours after the end of the surgical procedure.


OBJECTIVE
This study evaluated the effect of noninvasive ventilation with two pressure levels (BiPAP) in the pulmonary function, incidence of immediate postoperative pulmonary complications and the development of anastomotic dehiscence in morbid obese patients submitted to gastrojejunal derivation in Roux-en-Y (RYGB).


METHODS
It was an analytical and clinical study involving patients who were submitted to RYGB, had a body mass index (BMI) of at least 35 kg/cm², and were randomly chosen to receive BiPAP (experimental group) or standard oxygen therapy (control group), in the first four hours of the post-operation period. Patients with chronic or acute pulmonary disease were not included, and neither were the ones who needed invasive mechanical ventilation by the end of the surgery. Vital capacity, maximal inspiratory and expiratory pressure, and arterial blood gases were measured in the preoperative and in the first postoperative. Chest X-ray was performed in the third postoperative.


RESULTS
Eighteen patients were chosen for the study: ten received BiPAP and eight received standard oxygen therapy. The study group had better partial oxygen pressure and lower maximal expiratory pressure levels in the postoperative state than the control group. Anastomotic dehiscence was not observed in any group. There was no significant difference between the control group and the study group relating to the loss of vital capacity, maximal inspiratory pressure in the postoperative period or the incidence of atelectasis.


CONCLUSIONS
The BiPAP in the postoperative period of gastroplasty was useful to improve oxygenation and did not increase the incidence of anastomotic dehiscence.
Universidade Federal do Maranhão, São Luis, MA, Brasil. kivania@elo.com.br
Kivânia C
KC
Pessoa
Gutemberg F
GF
Araújo
Alcimar N
AN
Pinheiro
Maria R S
MR
Ramos
Sandra C
SC
Maia
D000328:Adult; D005260:Female; D015390:Gastric Bypass; D006801:Humans; D007583:Jejunum / Q000601:surgery*; D008297:Male; D011175:Positive-Pressure Respiration; D011183:Postoperative Complications / Q000517:prevention & control*; D013270:Stomach / Q000601:surgery*; D013997:Time Factors; D055815:Young Adult