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Hypertension II: Pathophysiology01:29

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Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
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Pathophysiology of the Nondipping Blood Pressure Pattern.

Justine Huart1,2, Alexandre Persu3, Jean-Philippe Lengelé3,4

  • 1Division of Nephrology, University of Liège Hospital (ULiège CHU), University of Liège, Belgium (J.H., J.-M.K., F.J.).

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Summary

The nondipping blood pressure (BP) pattern, a disruption in nighttime BP reduction, is linked to worse kidney and heart outcomes. This review explores its complex causes, including circadian rhythm, nervous system, and gut microbiota.

Keywords:
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Area of Science:

  • Nephrology
  • Cardiology
  • Chronobiology

Background:

  • Nondipping blood pressure (BP) is characterized by an insufficient decrease in BP during sleep.
  • This pattern is associated with poorer renal and cardiovascular outcomes, irrespective of average 24-hour BP.
  • The underlying pathophysiology is multifactorial and not fully understood.

Purpose of the Study:

  • To review the complex mechanisms contributing to the nondipping BP pattern.
  • To outline potential pathways involved in nondipping BP across various conditions.
  • To discuss emerging hypotheses, including the role of gut microbiota.

Main Methods:

  • Review of existing literature on circadian BP rhythms and nondipping patterns.
  • Analysis of physiological pathways implicated in BP regulation during sleep.
  • Exploration of recent research on gut microbiota and short-chain fatty acids.

Main Results:

  • Nondipping BP involves disruptions in circadian rhythm, autonomic nervous system function, and fluid/sodium balance.
  • Gut microbiota and fecal short-chain fatty acids are a novel area of investigation for dipping/nondipping patterns.
  • Multiple factors contribute to the nondipping phenotype, impacting patient prognosis.

Conclusions:

  • The nondipping BP pattern signifies a significant disruption in circadian BP regulation.
  • Understanding these complex mechanisms is crucial for improving patient outcomes.
  • Further research into novel factors like gut microbiota may reveal new therapeutic targets.