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Hemispheric influence on autonomic modulation and baroreflex sensitivity.

M J Hilz1, M Dütsch, K Perrine

  • 1Department of Neurology, New York University, School of Medicine, NY 10016, USA.

Annals of Neurology
|May 19, 2001
PubMed
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This study reveals distinct hemispheric roles in autonomic control. The left hemisphere primarily manages parasympathetic activity and baroreflex sensitivity, while the right influences sympathetic activity in epilepsy patients.

Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Epilepsy Research

Background:

  • Hemispheric lateralization of autonomic cardiovascular control is suggested but controversial.
  • Dominance of sympathetic versus parasympathetic activity by specific hemispheres remains unclear.
  • The impact of hemispheric function on baroreflex sensitivity (BRS) is unevaluated.

Purpose of the Study:

  • To investigate hemispheric autonomic control in epilepsy patients.
  • To assess cardiovascular and baroreflex modulation during unilateral hemispheric inactivation.

Main Methods:

  • Analyzed autonomic heart rate (HR) and blood pressure (BP) modulation in 15 epilepsy patients.
  • Assessed BRS before and during left and right intracarotid amobarbital procedure (IAP).

Related Experiment Videos

  • Utilized Blackman-Tukey spectral analysis to calculate low-frequency (LF) and high-frequency (HF) power and BRS.

    • Main Results:

    • Right hemispheric inactivation decreased BP and increased HF power of HR and BP.
    • Left hemispheric inactivation increased HR, BP, and LF power, while decreasing BRS by ~30%.
    • Confirmed sympathetic lateralization in the right hemisphere and parasympathetic predominance in the left.

    Conclusions:

    • Demonstrated parasympathetic predominance and BRS up-regulation in the left hemisphere.
    • Suggests unilateral electrical activity in epilepsy can disrupt interhemispheric autonomic balance.
    • Highlights potential contribution to cardiovascular dysregulation and sudden fatalities in epilepsy patients.