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Rassu AL, Evangelista E, Barateau L, Chenini S, Lopez R, Jaussent I, Dauvilliers Y. Idiopathic Hypersomnia Severity Scale to better quantify symptoms severity and their consequences in idiopathic hypersomnia. J Clin Sleep Med 2022; 18:617-629. [PMID: 34596041 PMCID: PMC8805002 DOI: 10.5664/jcsm.9682] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 09/20/2021] [Accepted: 09/20/2021] [Indexed: 02/03/2023]
Abstract
STUDY OBJECTIVES To assess the responsiveness of the Idiopathic Hypersomnia Severity Scale (IHSS) to medications and estimate the minimum clinically important difference, to report clinically relevant score ranges, and to confirm its psychometric properties and whether items need to be weighted in drug-free and treated patients with idiopathic hypersomnia (IH). METHODS Two-hundred twenty-six (166 drug-free and 60 treated) patients with IH (cross-sectional sample) completed the 14-item IHSS to quantify the severity of the 3 major IH symptoms (excessive daytime sleepiness, prolonged nighttime sleep, and sleep inertia) and consequences; 77 untreated patients were evaluated again after treatment (longitudinal sample). Patients filled in the Epworth Sleepiness Scale, Beck Depression Inventory II, and European Quality of Life questionnaires. RESULTS The IHSS confirmed adequate psychometric properties with a factor analysis indicating a 3-component solution. IHSS total score was lower in treated than untreated patients, with a mean difference of 4-5 points in the cross-sectional and longitudinal samples. Distribution-based methods were used to estimate that 4 points represented the minimum clinically important difference. Four severity levels were defined with between-group differences related to treatment. The probability of having severe sleepiness, depressive symptoms, and low quality of life increased with the severity level. Our results showed that IHSS item-weighting was not necessary. CONCLUSIONS The IHSS is a valid and reliable tool to quantify IH symptoms, with 4 severity score levels of clinical importance. The IHSS has adequate psychometric properties and can detect symptom changes after treatment. These findings should stimulate its use in clinical settings and in research studies. CITATION Rassu AL, Evangelista E, Barateau L, et al. Idiopathic Hypersomnia Severity Scale to better quantify symptoms severity and their consequences in idiopathic hypersomnia. J Clin Sleep Med. 2022;18(2):617-629.
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Affiliation(s)
- Anna Laura Rassu
- CHU Montpellier, Hôpital Gui-de-Chauliac, Service de Neurologie, Unité du Sommeil, Centre National de Référence pour la Narcolepsie, Montpellier, France
- Institute Neurosciences of Montellier, Université de Montpellier, INSERM, Montpellier, France
| | - Elisa Evangelista
- CHU Montpellier, Hôpital Gui-de-Chauliac, Service de Neurologie, Unité du Sommeil, Centre National de Référence pour la Narcolepsie, Montpellier, France
- Institute Neurosciences of Montellier, Université de Montpellier, INSERM, Montpellier, France
| | - Lucie Barateau
- CHU Montpellier, Hôpital Gui-de-Chauliac, Service de Neurologie, Unité du Sommeil, Centre National de Référence pour la Narcolepsie, Montpellier, France
- Institute Neurosciences of Montellier, Université de Montpellier, INSERM, Montpellier, France
| | - Sofiene Chenini
- CHU Montpellier, Hôpital Gui-de-Chauliac, Service de Neurologie, Unité du Sommeil, Centre National de Référence pour la Narcolepsie, Montpellier, France
- Institute Neurosciences of Montellier, Université de Montpellier, INSERM, Montpellier, France
| | - Régis Lopez
- CHU Montpellier, Hôpital Gui-de-Chauliac, Service de Neurologie, Unité du Sommeil, Centre National de Référence pour la Narcolepsie, Montpellier, France
- Institute Neurosciences of Montellier, Université de Montpellier, INSERM, Montpellier, France
| | - Isabelle Jaussent
- Institute Neurosciences of Montellier, Université de Montpellier, INSERM, Montpellier, France
| | - Yves Dauvilliers
- CHU Montpellier, Hôpital Gui-de-Chauliac, Service de Neurologie, Unité du Sommeil, Centre National de Référence pour la Narcolepsie, Montpellier, France
- Institute Neurosciences of Montellier, Université de Montpellier, INSERM, Montpellier, France
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