Abstract
Study design
Prospective observational study.
Objectives
To evaluate melatonin secretion, daytime sleepiness and sleep disorders in patients with spinal cord injuries (SCI), and their association with lesion level.
Setting
Specialized neuro rehabilitation hospital in France
Methods
Prospective observational study of patients aged over 18 hospitalized in for spinal cord injury. Sleep quality was measured with the Pittsburgh Sleep Quality Index (PQSI), daytime sleepiness with the Epworth Sleepiness scale (ESS), and melatonin secretion by 24 h urinary dosage of 6-sulphatoxy-melatonin.
Results
213 patients were screened, 21 patients were included: 17 complete (AIS A) and 4 lesions (AIS B), 76% of traumatic origin with 12 tetraplegic and 9 paraplegic, mean 10 (range 0.5–40) years after injury. Mean age was 46.8 ± 14.7 years, mean BMI 23.56 ± 4.1 and men outnumbered women (15 vs 6). Melatonin secretion was analyzed by 24 h secretion and by secretion profile. Comparing retained vs abolished secretion, only 23% (4/17) of patients with a lesion above T8 retained melatonin secretion, compared to 80% (4/5) with a lesion below T8 (p = 0.022). Non significant differences were found in secretion profile in patients who retained secretion: no patient with a lesion above T8 had a normal secretion profile compared to 50% with a lesion below T8 and in the impact of partial vs total lesions above T8 in whom 17% (2/12) of complete ASIA-A lesions and 50% (2/4) of incomplete lesions retained secretion.
Conclusion
Lesions of the spinal cord above T8 are strongly associated with abolition of melatonin secretion.
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Data availability
Anonymised data are available on request from the corresponding author.
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SH designed the study, analyzed the data and interpreted the results, drafted and revised the manuscript, approved the final version and are accountable for the work. RD, IB Collected and analyzed the data, interpreted the results, revised the manuscript, approved the final version and are accountable for the work. VR Analyzed melatonin levels, interpreted the results, revised the manuscript, approved the final version and is accountable for the work. MAQS Conceived and designed the study, interpreted the results, revised the manuscript, approved the final version and are accountable for the work. AL, JL, JDM, DB interpreted the results, revised the manuscript approved the final version and are accountable for the work.
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Hartley, S., Daville, R., Jonathan, L. et al. Melatonin secretion and sleep disorders in patients with spinal cord injuries. Spinal Cord 62, 143–148 (2024). https://doi.org/10.1038/s41393-024-00959-w
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DOI: https://doi.org/10.1038/s41393-024-00959-w