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Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression
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Association between decreased respiratory function and increased blood pressure variability.

Yuki Imaizumi1, Kazuo Eguchi, Satoshi Hoshide

  • 1Department of Medicine, Division of Cardiovascular Medicine, School of Medicine, Jichi Medical University, Shimotsuke, Tochigi Prefecture, Japan.

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|December 22, 2017
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Reduced respiratory function, specifically lower percent vital capacity, is linked to higher blood pressure variability during the day in hypertensive individuals. This suggests a potential mechanism for increased cardiovascular risk in those with impaired lung function.

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Area of Science:

  • Cardiology
  • Pulmonology
  • Autonomic Nervous System Regulation

Background:

  • The respiratory system plays a role in autonomic nervous system control and may influence blood pressure variability (BPV).
  • Hypertension is a condition characterized by elevated blood pressure, often associated with increased cardiovascular risk.

Purpose of the Study:

  • To investigate the association between decreased respiratory function and exaggerated BPV in hypertensive patients.
  • To determine if respiratory parameters correlate with blood pressure fluctuations in individuals with hypertension.

Main Methods:

  • A substudy of the Japan Morning Surge-Home Blood Pressure Study analyzed 95 hypertensive patients without clinical respiratory diseases.
  • Patients underwent ambulatory blood pressure monitoring (ABPM) and spirometry to assess respiratory function.

Main Results:

  • Percent vital capacity (%VC) was significantly associated with the standard deviation (SD) and coefficient of variation of daytime systolic blood pressure (SBP).
  • Lower %VC correlated with higher daytime SBP variability, even after adjusting for covariates.
  • Forced expiratory volume in 1 second as a percentage of forced vital capacity did not show a significant association with BPV.

Conclusions:

  • Decreased respiratory function, particularly lower %VC, is associated with exaggerated ambulatory BPV in hypertensive patients without respiratory diseases.
  • This association was most notable during daytime measurements.
  • The findings suggest that impaired respiratory function may contribute to elevated cardiovascular risk by exacerbating BPV.