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Updated: Jun 6, 2025

Drug-Induced Sleep Endoscopy DISE with Target Controlled Infusion TCI and Bispectral Analysis in Obstructive Sleep Apnea
Published on: December 6, 2016
Abbreviated versions of the insomnia severity index to screen for comorbid insomnia among obstructive sleep apnea
Marcela Yanagimori1, Mariana D Fernandes1, Gustavo F Grad1
1Unidade de Disturbios do Sono, Divisao de Pneumologia, Instituto do Coracao (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil.
Study Objectives:
The comorbidity of insomnia and obstructive sleep apnea (COMISA) is common and associated with adverse clinical consequences. While insomnia is often underdiagnosed among individuals with OSA, the identification of insomnia among these individuals may lead to improved medical care. Our objective was to assess the performance of two simplified tools (insomnia severity index-2 (ISI-2) and ISI-3) to identify insomnia among individuals with OSA. We hypothesized that the ISI-2 and ISI-3 perform well to diagnose insomnia among individuals with OSA.
Methods:
Four different cohorts of individuals with sleep disorders were studied. Cohorts 1,2 and 3 included individuals with OSA. Cohort 4 included individuals with insomnia only. The performance of ISI-2 and ISI-3 was compared to ISI-7-based diagnosis of insomnia using receiving operating characteristic curve analysis.
Results:
Cohorts 1, 2, 3 and 4 included 490, 124, 39 and 118 individuals, respectively. Individuals from cohorts 1, 2 and 3 were middle-aged, obese and had severe OSA on average. Individuals from cohort 2 were predominantly male while from cohorts 3 and 4 were predominantly female. Individuals from cohort 4 were slightly younger, and eutrophic on average. Cohorts 3 and 4 had higher insomnia severity (ISI-7) than cohorts 1 and 2. Using cohort 1, the best cut-offs for ISI-2 and ISI-3 were ≥6 and ≥8, respectively. Area under the curve (AUC) for ISI-2 was .900, .951 and .893 among cohorts 1, 2 and 4, respectively. AUC for ISI-3 was .924, .961 and .936 among cohorts 1, 2 and 4, respectively.
Conclusion:
ISI-2 and ISI-3 are accurate screening tools for insomnia among individuals with sleep disorders. Easy recognition of insomnia among individuals with COMISA may improve clinical outcomes.
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