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Related Experiment Videos

Poststroke alterations in heart rate variability during orthostatic challenge.

Joel Rodriguez1, Andrew Philip Blaber, Markus Kneihsl

  • 1Gravitational Physiology and Medicine Research Unit, Institute of Physiology, Medical University of Graz, Graz, Austria Centre of Human and Aerospace Physiological Sciences, King's College London, London, UK Aerospace Physiology Laboratory, Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, Canada Department of Neurology, Medical University of Graz, Graz, Austria Centre of Human and Aerospace Physiological Sciences (CHAPS), King's College London, Faculty of Life Sciences and Medicine, Guy's Campus, London, UK KBRwyle, European Astronaut Centre, Linder Höhe, Cologne, Germany.

Medicine
|April 7, 2017
PubMed
Summary

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Older adults recovering from ischemic stroke show impaired autonomic responses, leading to a greater drop in heart rate variability when standing. This autonomic dysfunction may increase risks of falls and fainting.

Area of Science:

  • Neurology
  • Cardiology
  • Autonomic Neuroscience

Background:

  • Older adults post-ischemic stroke often experience orthostatic hypotension, syncope, and falls.
  • Impaired autonomic responses may limit cerebral blood flow maintenance in these individuals.

Purpose of the Study:

  • To investigate cerebrovascular and cardiovascular regulation in older adults post-ischemic stroke.
  • To compare autonomic variables between stroke survivors and healthy controls during rest and standing.

Main Methods:

  • Studied 23 adults (≥55 years): 10 ischemic stroke survivors and 13 healthy controls.
  • Measured arterial blood pressure, muscle-pump baroreflex, heart rate variability, and cerebral blood flow velocity.
  • Data collected while sitting and during quiet standing.

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Main Results:

  • The stroke group exhibited a significantly greater decline in the low-frequency component of heart rate variability upon standing.
  • No significant differences were found in other cardiovascular parameters or autonomic function assessments between groups.
  • Autonomic dysfunction persisted approximately 7 months post-stroke.

Conclusions:

  • Findings support continued autonomic dysfunction after ischemic stroke recovery.
  • This dysfunction may attenuate the cardiovascular response to standing, increasing fall risk.
  • Further research is needed to clarify mechanisms behind increased orthostatic hypotension, syncope, and falls post-stroke.