http://brain.oxfordjournals.org/content/early/2015/01/13/brain.awu391
Summary
Post-traumatic
sleep-wake disturbances are common after acute traumatic brain injury.
Increased sleep need per 24 h and excessive daytime sleepiness are among
the most prevalent post-traumatic sleep disorders and impair quality of
life of trauma patients. Nevertheless, the relation between traumatic
brain injury and sleep outcome, but also the link between post-traumatic
sleep problems and clinical measures in the acute phase after traumatic
brain injury has so far not been addressed in a controlled and
prospective approach. We therefore performed a prospective controlled
clinical study to examine (i) sleep-wake outcome after traumatic brain
injury; and (ii) to screen for clinical and laboratory predictors of
poor sleep-wake outcome after acute traumatic brain injury. Forty-two of
60 included patients with first-ever traumatic brain injury were
available for follow-up examinations. Six months after trauma, the
average sleep need per 24 h as assessed by actigraphy was markedly
increased in patients as compared to controls (8.3 ± 1.1 h versus 7.1 ±
0.8 h, P < 0.0001). Objective daytime sleepiness was found
in 57% of trauma patients and 19% of healthy subjects, and the average
sleep latency in patients was reduced to 8.7 ± 4.6 min (12.1 ± 4.7 min
in controls, P = 0.0009). Patients, but not controls, markedly
underestimated both excessive sleep need and excessive daytime
sleepiness when assessed only by subjective means, emphasizing the
unreliability of self-assessment of increased sleep propensity in
traumatic brain injury patients. At polysomnography, slow wave sleep
after traumatic brain injury was more consolidated. The most important
risk factor for developing increased sleep need after traumatic brain
injury was the presence of an intracranial haemorrhage. In conclusion,
we provide controlled and objective evidence for a direct relation
between sleep-wake disturbances and traumatic brain injury, and for
clinically significant underestimation of post-traumatic sleep-wake
disturbances by trauma patients.
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