Journal of Otolaryngology and Ophthalmology of Shandong University ›› 2023, Vol. 37 ›› Issue (6): 112-117.doi: 10.6040/j.issn.1673-3770.0.2023.181

• Clinical Study • Previous Articles     Next Articles

Comparative analysis of polysomnography parameters between the first and second halves of the night in snoring patients

ZHANG Yuhuan1, ZHANG Junbo2, YIN Guoping1, YUAN Xuemei1, CAO Xin1, SUN Yu1, CHEN Qiang1, YE Jingying1   

  1. 1.Department of Otorhinolayrngology & Head and Neck Surgery, Beijing Tsinghua Changgung Hospital, Beijing 102218, China2.Department of Otorhinolayrngology, Peking University First Hospital, Beijing 100034, China
  • Published:2023-12-15

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Abstract: Objective To compare and analyze the differences in the critical parameters of polysomnography(PSG)between the first and second halves of the night in patients with snoring, including those with obstructive sleep apnea syndrome(OSAS), and to clarify whether the split-night diagnostic results can accurately reflect the patient's overnight status. Methods Patients who presented with sleep snoring and who underwent overnight PSG examination from April to May 2022 were selected as the study population. All of the enrolled patients completed standard overnight PSG examinations. The study period of one night was split into the first and second halves using 2 a.m. as the dividing point, and the relevant PSG parameters of both halves were compared and analyzed. Results Based on the apnea hypopnea index(AHI), a total of 47 patients with OSAS(AHI ≥5 times/h)and 16 patients with simple snoring(AHI <5 times/h)were included. In patients with OSAS, the AHI, oxygen desaturation index(ODI), micro-arousal index(MAI), and proportion of N2 and N3 sleep were significantly higher; whereas, the average blood oxygen level and proportion of rapid eye movement(REM)sleep were significantly lower(P<0.05)during the first half compared with the second half of the night. However, in the 16 patients with simple snoring, only the proportion of N3 sleep was significantly higher and the proportion of REM sleep was significantly lower(all P<0.05)during the first half in comparison with the second half of the night. The difference in AHI(△AHI)before and after midnight in the patients with OSAS ranged from -19.6 to 52.4 times/h, and the median value was 4.9(-2.3, 10.7)times/h. Further analysis showed that △AHI was not significantly correlated with different sleep stages(P>0.05). There were 16 patients(34.0%)with an absolute value of △AHI(|△AHI|)≥10 times/h. Patients with |△AHI| <10 times/h had significantly higher AHI, ODI, and MAI during the first half of the night(P<0.05)than those with |△AHI| ≥10 times/h. Conclusion There was a significant difference in the severity of disease between the first and second halves of the night in the patients with OSAS; this difference was more pronounced during the first half in those with a more severe disease. The results indicated that the PSG data from the first half of the night was not reliable for guiding subsequent treatment. Meanwhile, the aforementioned phenomenon was not obvious in the patients with simple snoring.

Key words: Polysomnography, Obstructive sleep apnea syndrome, Night-splited diagnosis

CLC Number: 

  • R766.04
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