Preoperative predictors of difficult intubation in patients with obstructive sleep apnea syndrome.
OBJECTIVE
It has been speculated that the severity of obstructive sleep apnea syndrome (OSAS) is related to difficult intubation. However, this has not been confirmed in OSAS patients. Thus, we undertook a retrospective study to assess this relationship in patients who had undergone uvulopalatopharyngoplasty (UPPP) surgery for OSAS.


METHODS
A retrospective case-control study was undertaken following approval from the Institutional Review Board on human studies. The data from 90 patients with a polysomnograph-confirmed diagnosis of OSAS, who had undergone UPPP surgery under general anesthesia, were used to evaluate the apnea-hypopnea index (AHI), the preoperative lowest arterial saturation, the occurrence of difficult intubation as assessed by the operator intubation difficulty scale score, extubation time, lowest arterial saturation in postanesthesia care unit, and length of stay in postanesthesia care unit. We compared OSAS patients with 90 age and sex-matched control patients with respect to the prevalence of difficult intubation.


RESULTS
The prevalence of difficult intubation was higher in the OSAS group than in the control group (16.7% vs 3.3%, P = 0.003). When evaluating the OSAS group according to the occurrence of difficult intubation, AHI was significantly higher in the difficult intubation subgroup (67.4 +/- 22.5 vs 49.9 +/- 28.0, P = 0.026), and patients with an AHI >or= 40 showed a significantly higher prevalence of difficult intubation.


CONCLUSIONS
This study shows that the occurrence of difficult intubation can be predicted using AHI in patients who undergo UPPP surgery for OSAS.
Kim
Jie Ae
JA
Department of Anesthesiology, Samsung Medical Center, 50 Ilwon-dong, Kangnam-gu, Seoul 135-710, South Korea.
Lee
Jeong Jin
JJ
D000328:Adult; D000768:Anesthesia, General; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D010614:Pharynx / Q000601:surgery; D011237:Predictive Value of Tests; D011300:Preoperative Care / Q000379:methods*; D012189:Retrospective Studies; D012720:Severity of Illness Index; D020181:Sleep Apnea, Obstructive / Q000150:complications* / Q000601:surgery; D013997:Time Factors; D014609:Uvula / Q000601:surgery