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Posture changes and subfoveal choroidal blood flow.

Antonio Longo1, Martial H Geiser, Charles E Riva

  • 1Istituto di Oftalmologia, Università di Catania, Catania, Italy.

Investigative Ophthalmology & Visual Science
|January 28, 2004
PubMed
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Changing body posture from standing to supine increases subfoveal choroidal blood flow (ChBF) in healthy individuals. This suggests a passive circulatory response to postural changes affecting ocular hemodynamics.

Area of Science:

  • Ophthalmology
  • Physiology
  • Cardiovascular Research

Background:

  • Choroidal blood flow (ChBF) is crucial for retinal health.
  • Understanding ocular hemodynamics in response to physiological changes like posture is important for ophthalmic research.

Purpose of the Study:

  • To investigate the impact of posture alteration on subfoveal choroidal blood flow (ChBF) in healthy volunteers.
  • To analyze changes in pulsatile, nonpulsatile, and mean ChBF during postural shifts.

Main Methods:

  • Laser Doppler flowmetry was used to measure ChBF in 11 healthy volunteers.
  • Subjects were moved from a standing to a supine position and back using a mechanical table.
  • Heart rate, blood pressure, and intraocular pressure were monitored throughout the experiment.

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Main Results:

  • A significant increase in mean ChBF (11%) was observed upon tilting from standing to supine.
  • This increase was mainly attributed to a rise in the nonpulsatile component of blood flow.
  • Heart rate decreased by 16% and intraocular pressure increased by 29% in the supine position.

Conclusions:

  • The observed increase in ChBF suggests a passive adaptation of choroidal circulation to postural changes.
  • Ocular perfusion pressure may not increase as predicted by hydrostatic principles alone during supine positioning.