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Salt sensitivity and hypertension.

Olga Balafa1, Rigas G Kalaitzidis2

  • 1Department of Nephrology, University Hospital of Ioannina, Ioannina, Greece.

Journal of Human Hypertension
|August 31, 2020
PubMed
Summary
This summary is machine-generated.

Salt sensitivity describes how blood pressure (BP) changes with salt intake. This trait, common in certain groups, involves abnormal kidney and vascular responses to salt, with skin sodium accumulation being a recent focus.

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Area of Science:

  • Physiology
  • Nephrology
  • Cardiovascular Medicine

Background:

  • Salt sensitivity is a trait where blood pressure (BP) varies with salt intake.
  • It is more prevalent in the elderly, females, Afro-Americans, and patients with chronic kidney disease (CKD) or insulin resistance.
  • Increased salt intake can lead to expanded extracellular fluid volume and elevated cardiac output.

Purpose of the Study:

  • To explore the physiological mechanisms underlying salt sensitivity.
  • To investigate the role of abnormal kidney function and vascular responses in salt-sensitive individuals.
  • To examine the potential link between skin sodium accumulation, BP, and salt sensitivity.

Main Methods:

  • Review of existing literature on salt sensitivity and its physiological correlates.
  • Analysis of studies investigating kidney and vascular adaptations to salt intake.
  • Exploration of recent findings on sodium accumulation in the skin.

Main Results:

  • Salt-sensitive individuals exhibit impaired kidney salt excretion due to sympathetic nervous system over-activity and blunted renin-angiotensin suppression.
  • Vascular resistance increases in salt-sensitive subjects, linked to impaired nitric oxide synthesis.
  • Dietary salt can accumulate in the skin, with higher levels observed in hypertensive and CKD patients.

Conclusions:

  • Salt sensitivity involves complex interactions between the kidneys, vasculature, and potentially the skin.
  • The precise link between skin sodium, BP regulation, and salt sensitivity requires further elucidation.
  • Current diagnostic limitations hinder the clinical application of salt sensitivity assessment in routine patient care.