Acoustic analysis of snoring sounds by a multidimensional voice program.
OBJECTIVE
This prospective study aimed to determine whether the acoustic characteristics of snoring sounds differed between simple snorers and patients with obstructive sleep apnea syndrome (OSAS) by using a multidimensional voice program (MDVP) that analyzes various aspects of voice.


METHODS
Fifty-eight patients (48 men, 10 women) with a history of snoring were included in the study. All patients underwent conventional polysomnography (PSG). Twelve subjects were diagnosed as simple snorers and 46 subjects were diagnosed with OSAS. The mean body mass index (BMI) of simple snorers was 24.7 kg/m and that of patients with OSAS was 25.8 kg/m. Natural overnight snoring was recorded from each subject while they slept during PSG. Using the multiple token protocols of MDVP, 30 snores from each subject were analyzed automatically. For data analysis, four markers were used: peak frequency, soft phonation index (SPI), noise to harmonics ratio (NHR), and power ratio.


RESULTS
The Mann-Whitney U test revealed significant differences between the SPI, NHR, and power ratio of simple snorers and patients with OSAS. Simple snorers had a high SPI value. OSAS-related snorers demonstrated a high NHR and low power ratio.


CONCLUSIONS
MDVP can be used for snoring sound analysis as a noninvasive examination of sleep-related breathing disorders for differential diagnosis. However, a suitable option that is rapid and has an easy-to-use interface would be more advantageous for analyzing snoring sounds.
Department of Otolaryngology, Yamaguchi University School of Medicine, Ube, Yamaguchi, Japan. harahiro@yamaguchi-u.ac.jp
Hirotaka
H
Hara
Naoko
N
Murakami
Yuji
Y
Miyauchi
Hiroshi
H
Yamashita
D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D011446:Prospective Studies; D012135:Respiratory Sounds / Q000175:diagnosis / Q000503:physiopathology; D012913:Snoring / Q000175:diagnosis / Q000503:physiopathology*; D013018:Sound Spectrography; D013637:Tape Recording