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Polysomnography reveals unexpectedly high rates of organic sleep disorders in patients with prediagnosed primary insomnia

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Abstract

Objective

It is a matter of debate whether patients with primary insomnia require a polysomnographic examination in order to exclude specific sleep disorders such as sleep apnea syndrome (SAS) or periodic limb movements (PLM). Using a prospective design, we investigated the prevalence of organic sleep disorders by means of polysomnography (PSG) in a series of patients who were previously diagnosed with primary insomnia. This diagnosis was based on a clinical exam and an ambulatory monitoring device or previous PSG.

Methods

Seventy-seven women and 16 men (mean age 55.12 ± 13.21 years) who were admitted for cognitive behavioral therapy for insomnia were evaluated by PSG including cardiorespiratory parameters and tibialis EMG. Among them, 50 patients had undergone a clinical exam by a sleep specialist; in 18 patients, actigraphy or portable monitoring had been performed to exclude SAS or PLM; 25 patients had undergone PSG in another sleep lab previously.

Results

In 32 patients (34% of the sample), a PSG revealed a specific sleep disorder (SAS 16; PLMD 11; both 5), resulting in therapeutic consequences for 21 patients (SAS 10; PLMD 9; both 2). SAS and PLM patients were older and SAS patients had a higher body mass index than insomnia patients without additional findings.

Conclusion

Indications for a PSG should be handled less restrictively in the diagnostic workup of older insomnia patients since they have a higher risk of comorbid sleep disorders even in the absence of the clinical signs of SAS or PLM.

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Abbreviations

AHI:

Apnea–hypopnea index

BDI:

Beck Depression Inventory

BMI:

Body mass index

CBT-I:

Cognitive behavior therapy for insomnia

CPAP:

Continuous positive airway pressure

ESS:

Epworth Sleepiness Scale

INS:

Insomnia patients without any new findings in PSG

I-PLM:

Insomnia patients with unexpected PLMs in PSG

I-SAS:

Insomnia patients with unexpected SAS in PSG

I-SAS + PLM:

Insomnia patients with unexpected SAS and PLMs in PSG

PLM:

Periodic limb movements in sleep

PSG:

Polysomnography

PSQI:

Pittsburgh Sleep Quality Index

SAS:

Sleep apnea syndrome

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None of the authors have a conflict of interest with respect to this study.

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Correspondence to Tatjana Crönlein.

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Crönlein, T., Geisler, P., Langguth, B. et al. Polysomnography reveals unexpectedly high rates of organic sleep disorders in patients with prediagnosed primary insomnia. Sleep Breath 16, 1097–1103 (2012). https://doi.org/10.1007/s11325-011-0608-8

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  • DOI: https://doi.org/10.1007/s11325-011-0608-8

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