Authors: Renato Stefanini, Fabio Caparroz, Danilo Anunciatto Sguillar, Tatiana de Aguiar Vidigal, Lia Bittencourt, Sergio Tufik, Fernanda Louise Martinho Haddad.

ABSTRACT
Purpose
One of the concerns regarding surgical treatment of the obstructive sleep apnea syndrome (OSAS) has been the possibility that these patients may experience a higher rate of perioperative complications, which could be aggravated by the upper airway edema caused by surgical trauma. The purpose of this study was to evaluate the immediate impact of pharyngeal surgery on the respiratory parameters of adult patients with OSAS.
Methods
Twenty-three adults with moderate to severe OSAS and indications for pharyngeal surgery (with or without nasal surgery) were consecutively selected. The subjects underwent surgical treatment and monitoring of sleep parameters preoperatively (by type I polysomnography, PSG) and in the immediate postoperative period (arterial tonometry).
Results
Twenty-two subjects, aged 20 to 59 years (mean ± SD, 38.0 ± 12.1 years), were included in the study. Nineteen (86.4%) were male. The mean apnea-hypopnea index (AHI) was 59.3 ± 26.0 events/h. Comparison between preoperative PSG and postoperative arterial tonometry revealed statistically significant reductions in AHI (p = 0.03), respiratory disturbance index (RDI) (p = 0.05), and oxygen desaturation index (p = 0.001), as well as increases in nadir oxyhemoglobin saturation (p = 0.003) and percentage of REM sleep (p = 0.01).
Conclusions
In this sample of patients with moderate and severe OSAS who underwent pharyngeal surgery, the vast majority of patients did not exhibit any deterioration of respiratory parameters in the immediate postoperative period. Conversely, there was a significant improvement in the parameters.
DOI: http://dx.doi.org/10.1007/s11325-019-01888-2