[Preliminary research on clinical value of localization of upper airway obstruction with nasopharyngeal airway combined with polysomnography].

OBJECTIVE

To investigate the clinical value of localization of upper airway obstructive site with the method of combination of nasopharyngeal airway and polysomnography (PSG).

METHODS

Forty-seven patients diagnosed as obstructive sleep apnea hypopnea syndrome (OSAHS) by PSG were enrolled. Each patient was examined by Somte PSG for the first night, underwent repeated PSG examination with the nasopharyngeal airway in place for the second night and received airway continuous pressure measurements (ApneaGraph) examination for the third night. The standard of treatment success was defined as apnea-hypopnea index (AHI) less than 20/h and a reduction of 50% or more. The patients were divided into success group and failure group. The PSG indices and ApneaGraph data of the two groups were compared. Correlations between AHI with nasopharyngeal airway in place by PSG and lower AHI and constituent ratio of lower obstruction by ApneaGraph were calculated. SPSS 17.0 software was used to analyze the data.

RESULTS

Forty-two patients completal three-night examination. With the nasopharyngeal airway in place, AHI, the lowest oxyhemoglobin saturation (LSaO2), average oxyhemoglobin saturation, percent of sleep time with oxyhemoglobin saturation <0.90 (SaO2 < 0.90T%) were improved obviously (P < 0.001). Twenty-nine patients (69.0%) achieved treatment success. There were statistical differences (t = 2.670, P = 0.011; Z = -3.252, P = 0.001 and t = -4.556, P < 0.001) of LSaO2 by PSG, lower AHI and constituent ratio of lower obstruction by ApneaGraph compared success group with failure group. The correlations between AHI with nasopharyngeal airway in place by PSG and lower AHI and constituent ratio of lower obstruction by ApneaGraph were 0.616 (P < 0.001) and 0.526 (P < 0.001).

CONCLUSION

The method of combination of nasopharyngeal airway with PSG is a reliable method of localization of upper airway obstructive site and can be used as a simple means to find out if there's any retroglossal obstruction.