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Related Experiment Videos

Altered cardiorespiratory transfer in hypertension

V Novak1, P Novak, J de Champlain

  • 1Research Center, Hôpital du Sacré Coeur de Montréal, Quebec, Canada.

Hypertension (Dallas, Tex. : 1979)
|January 1, 1994
PubMed
Summary

Hypertensive patients exhibit irregular breathing and impaired cardiorespiratory interactions, suggesting reduced parasympathetic function. Slowing respiration reveals diminished cardiorespiratory coupling in hypertension.

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Area of Science:

  • Cardiovascular Physiology
  • Respiratory Physiology
  • Hypertension Research

Background:

  • Cardiorespiratory interactions are crucial for maintaining cardiovascular homeostasis.
  • Hypertension is associated with altered autonomic nervous system function.
  • The impact of controlled respiratory changes on cardiovascular dynamics in hypertension is not fully understood.

Purpose of the Study:

  • To investigate the effects of controlled respiratory slowing on cardiovascular variables in hypertensive and normotensive individuals.
  • To analyze dynamic cardiorespiratory interactions using time-frequency distributions.
  • To assess autonomic responsiveness in mild hypertension.

Main Methods:

  • Recruited 14 hypertensive and 16 normotensive subjects.

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  • Employed beat-to-beat Wigner distributions for dynamic analysis of RR interval, systolic, and diastolic pressures.
  • Systematically slowed respiration from 0.46 Hz to 0.05 Hz.

    • Main Results:

    • Hypertensive patients showed increased blood pressure instability and low-frequency spectral power during slow breathing and apneas.
    • Respiratory fluctuations in RR interval and non-respiratory fluctuations in systolic pressure were reduced in hypertensive patients.
    • Slowing respiration entrained cardiorespiratory fluctuations, but these remained diminished in the RR interval for hypertensive patients.
    • A dynamic cardiorespiratory index was significantly smaller in hypertensive patients, indicating impaired coupling.

    Conclusions:

    • Hypertensive patients exhibit irregular breathing patterns at rest.
    • The transfer of respiratory signals to the RR interval is diminished in hypertension, suggesting impaired parasympathetic responsiveness.
    • These findings highlight altered cardiorespiratory dynamics in mild hypertension.