A preliminary study of correlation between portable sleep monitoring and laboratory polysomnography

OBJECTIVE To evaluate the consistency and relevance of the portable sleep monitoring system and laboratory polysomnography in the diagnosis of obstructive sleep apnea hypopnea syndrome(OSAHS).METHODS Thirty nine cases with suspected OSAHS received laboratory polysomnography and portable sleep monitor synchronously.The parameters of apnea hypopnea index(AHI),apnea hypopnea(AH),apnea index(AI),hypopnea index(HI),mean oxygen saturation(MSaO2),lowest oxygen saturation(LSaO2),percentage of time with an oxygen saturation below 90%(CT90%),and total sleep time(TST)were collected and analyzed.Paired Rank Test was adopted and P0.05 was accepted as statistically significant.RESULTS The laboratory polysomnography showed 4 non-OSAHS cases,33 cases met the diagnostic criteria for OSAHS,including 2 mild cases,4 moderate cases and 27 severe cases.Portable sleep monitor showed 4 non-OSAHS patients and 33 OSAHS patients,5 mild cases,3 moderate cases and 25 severe cases.The diagnostic accuracy was 100% and the concordance rates of diagnostic accuracy in mild,moderate and severe patients were 40%,75% and 92.6%.In addition,the parameters of AHI,AH and AI had statistically significant difference,while HI,MSaO2,LSaO2,CT90%,and TST had no significant difference(P0.05).CONCLUSION The portable sleep monitor is a helpful and simple equipment in the identification of patients with OSAHS for it provides effective data for clinical diagnosis.But the diagnostic accuracy in the severity of the disease must be improved.