AN ACOUSTIC SCREENING-TEST FOR OBSTRUCTIVE SLEEP-APNEA

Third-octave sound analysis was performed on the snoring sounds of nin e subjects with obstructive sleep apnoea (OSA) and 18 with simple snor ing. Both groups demonstrated a large low frequency peak in linear sou nd levels at around 80 Hz. However, the OSA. group displayed a substan tially larger high frequency sound component. We utilized this fact in the development of an acoustic index (Hawke Index: HI) which describe s the ratio between the overall A-weighted and linear sound levels for the recorded snoring sound of each subject [HI = dB(A)/dB(SPL) for Lm ax]. There was a significant positive correlation between the apnoea/h ypopnoea index and the HI (r = 0.73, t = 5.3, 25df, P < 0.001). If a v alue of 0.90 or greater was taken as diagnostic of OSA, the HI exhibit ed 67% sensitivity, 100% specificity, 100% positive and 86% negative p redictive accuracy. With further development, we believe this acoustic phenomena may have a role as a screening test in the diagnosis of OSA .