Clinical Edge

Summaries of Must-Read Clinical Literature, Guidelines, and FDA Actions

Sex-Specific Hippocampus Volume Changes in OSA

Neuroimage Clin; ePub 2018 Jul 27; Macey, et al

In obstructive sleep apnea (OSA), the hippocampus shows lateralized and sex-specific, OSA-related regional volume differences, which may contribute to sex-related expression of symptoms in the sleep disorder, according to a recent study. High-resolution T1-weighted images were collected from 66 newly-diagnosed, untreated OSA (mean age ± SD: 46.3 ± 8.8 years; 50 male) and 59 healthy age-matched control (46.8 ± 9.0 years; 38 male) participants. Researchers added age-matched controls with T1-weighted scans from 2 datasets (IXI, OASIS-MRI), for 979 controls total (426 male/46.5 ± 9.9 years). They found:

  • In OSA relative to controls, the hippocampus showed small areas larger volume bilaterally in cornu ammonis (CA)1 (surface displacement ≤0.56 mm), subiculum, and uncus, and smaller volume in right posterior CA3/dentate (≥ − 0.23 mm).
  • OSA vs control males showed higher bilateral volume (≤0.61 mm) throughout CA1 and subiculum, extending to head and tail, with greater right-sided increases; lower bilateral volumes (≥ − 0.45 mm) appeared in mid- and posterior-CA3/dentate.
  • OSA vs control females showed only right-sided effects, with increased CA1 and subiculum/uncus volumes (≤0.67 mm), and decreased posterior CA3/dentate volumes (≥ − 0.52 mm).
  • Unlike males, OSA females showed volume decreases in the right hippocampus head and tail.

Citation:

Macey PM, Prasad JP, Ogren JA, et al. Sex-specific hippocampus volume changes in obstructive sleep apnea. [Published online ahead of print July 27, 2018]. Neuroimage Clin. doi:10.1016/j.nicl.2018.07.027.

This Week's Must Reads

Higher Cortisol Linked with Lower Brain Volume, Neurology; ePub 2018 Oct 24; Echouffo-Tcheugui, et al

Ischemic Stroke Transfers in the Northeastern US, J Stroke Cerebrovasc Dis; ePub 2018 Oct 30; Zachrison, et al

Predictors of Recurrent Hospitalizations Post-TIA, J Stroke Cerebrovasc Dis; ePub 2018 Oct 17; Yousufuddin, et al

Sleep Apnea Associated with Less Healthful Diet, Sleep; ePub 2018 Oct 22; Reid, Maras, Shea, et al

Hypertension, Obesity, Cognitive Decline Examined , Alzheimers Dement; ePub 2018 Oct 24; Clark, et al

Must Reads in Sleep Medicine

Sleep Apnea Associated with Less Healthful Diet, Sleep; ePub 2018 Oct 22; Reid, Maras, Shea, et al

Sleep Duration/Stroke Link Differs by Race and Sex, Neurology; ePub 2018 Oct 3; Petrov, Howard, et al

Probable OSA Common in Refractory Epilepsy, Epilepsia; ePub 2018 Sep 24; McCarter, et al

Opioid Use, Insomnia, and Pain Intensity, Sleep Med; ePub 2018 Sep 5; Miller, et al

Gout Linked with 2-Fold Higher Risk of Sleep Apnea, J Clin Sleep Med; ePub 2018 Aug 30; Singh, Cleveland