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Predicting Neck Fluid Accumulation While Supine.

Daniel Vena1,2, Babak Taati1,3, Azadeh Yadollahi1,2

  • 1University Health Network - Toronto Rehabilitation Institute, Toronto, Canada.

Journal of Healthcare Engineering
|March 25, 2016
PubMed
Summary
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Men experience greater neck fluid accumulation when lying down, a risk factor for sleep apnea. Baseline leg fluid volume predicts this change and neck size increase.

Area of Science:

  • Physiology
  • Sleep Medicine
  • Biomedical Engineering

Background:

  • Fluid shifts rostrally from the legs to the neck when supine.
  • This fluid accumulation is a risk factor for obstructive sleep apnea (OSA).

Purpose of the Study:

  • To model neck fluid accumulation using baseline measurements.
  • To identify predictors of fluid accumulation and neck circumference changes during recumbency.

Main Methods:

  • Bioelectrical impedance used to measure leg and neck fluid volumes (LFV, NFV).
  • Measurements taken continuously in 30 adults (13 men) standing then lying supine for 90 minutes.
  • Neck circumference (NC) measured pre- and post-supine exposure.

Main Results:

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  • Men showed a greater increase in NC compared to women after lying supine.
  • Baseline LFV significantly correlated with fluid change in legs (ΔLFV) and NC change (ΔNC).

Conclusions:

  • Sex and baseline LFV predict fluid redistribution and neck circumference increase during recumbency.
  • Findings contribute to understanding OSA risk factors related to body fluid shifts.