Abstract
Introduction
Spinal and bulbar muscular atrophy (SBMA) is a progressive, X-linked lower motor neuron disorder exclusively affecting men. Since knowledge on sleep disorders in SBMA is scarce compared to other motoneuron diseases, this retrospective case-control study aimed to investigate sleep and sleep-related breathing in patients with SBMA.
Methods
In 23 non-ventilated patients with SBMA (median age 52 years), clinical disease characteristics, forced vital capacity and diagnostic polysomnographies were retrospectively evaluated. In 16 patients, overnight transcutaneous capnometry was available. Twenty-three male control subjects with chronic insomnia were matched for age and body mass index.
Results
In patients with SBMA obstructive sleep apnoea (OSA, apnoea-hypopnoea index/AHI > 5/h) was more frequent than in control subjects (14/23 or 61% vs. 6/23 or 26%, p = 0.02), and median AHI was significantly higher in patients (9.0/h vs. 3.4/h, p < 0.01). Among SBMA patients, the AHI was not related to age or body mass index. Alveolar hypoventilation as reflected by nocturnal hypercapnia was found in 3/16 patients. Rapid eye movement (REM) sleep without atonia was present in 44% of SBMA patients but only in 4% of controls (p < 0.01). During REM and non-REM sleep, no behavioural abnormalities were observed in either group. Periodic limb movements in sleep (index > 15/h) were frequent in SBMA patients but rarely disrupted sleep.
Conclusions
In patients with SBMA, sleep-disordered breathing may comprise both OSA and nocturnal hypoventilation. REM sleep without atonia may also be found, but its clinical significance remains unclear. In patients complaining of sleep-related symptoms, cardiorespiratory polysomnography and transcutaneous capnometry are recommended.
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Data availability
Original data were accessible to all authors. Further details can be requested from the corresponding author.
Abbreviations
- AHI:
-
apnoea-hypopnoea index
- ALS:
-
amyotrophic lateral sclerosis
- BMI:
-
body mass index
- CO2 :
-
carbon dioxide
- COLD:
-
chronic obstructive lung disease
- CPAP:
-
continuous positive airway pressure
- ESS:
-
Epworth Sleepiness Scale
- N3:
-
slow-wave sleep
- ODI:
-
oxygen desaturation index
- OSA:
-
obstructive sleep apnoea
- PLM:
-
periodic limb movements
- PLMI:
-
periodic limb movement index
- PLMS:
-
period limb movements in sleep
- PSG:
-
polysomnography
- ptcCO2 :
-
transcutaneous CO2 tension
- RBD:
-
REM sleep behaviour disorder
- REM:
-
rapid eye movement sleep
- RSWA:
-
REM sleep without atonia
- SBMA:
-
spinal and bulbar muscular atrophy
- SDB:
-
sleep-disordered breathing
- SMA:
-
spinal muscular atrophy
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LL analysed the data and wrote the initial draft of the manuscript. SPM and LL reviewed sleep study recordings. CG specifically analysed sleep-related breathing and behaviour during REM sleep. MB and PY designed the study, reviewed the data analyses and critically revised the manuscript. All authors have seen and approved the final version of the manuscript.
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Conflict of interest
LL, CG and SPM declare no competing interests. PY received honoraria from UCB, Sanofi-Genzyme, VANDA, Medice, Löwenstein Medical, ResMed and Bioprojet for speaker’s bureaus. He received honoraria for advisory boards from Sanofi-Genzyme and Pharnext. MB received speaker honoraria and financial research support by Sanofi-Genzyme, Löwenstein Medical and UCB (speaker honoraria only).
Ethics approval
This retrospective study was based on data derived from routine clinical care and was approved by the local ethics committee. This article does not report the results of a clinical trial.
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Comment
The paper has indisputable scientific relevance and warns of the need to carefully evaluate the respiratory and sleep aspects of patients with Kennedy’s disease.
Luciana Moraes Studart-Pereira
Brazil
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Langenbruch, L., Perez-Mengual, S., Glatz, C. et al. Disorders of sleep in spinal and bulbar muscular atrophy (Kennedy’s disease). Sleep Breath 25, 1399–1405 (2021). https://doi.org/10.1007/s11325-020-02253-4
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DOI: https://doi.org/10.1007/s11325-020-02253-4