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Related Concept Videos

Hormonal Regulation01:33

Hormonal Regulation

The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.
Antihypertensive Drugs: Potassium-Sparing Diuretics01:28

Antihypertensive Drugs: Potassium-Sparing Diuretics

Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...
Hormonal Regulation of Blood Pressure01:17

Hormonal Regulation of Blood Pressure

Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
Regulation of Sodium and Potassium01:26

Regulation of Sodium and Potassium

The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily in...
Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
Antihypertensive Drugs: Direct Renin Inhibitors01:25

Antihypertensive Drugs: Direct Renin Inhibitors

The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...

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Related Experiment Video

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In Vivo Real-Time Study of Drug Effects on Carotid Blood Flow in the Ovine Fetus
11:59

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Published on: April 28, 2023

Physiological partial aldosterone resistance in human newborns.

Laetitia Martinerie1, Eric Pussard, Laurence Foix-L'Hélias

  • 1Inserm, U693, Faculté de Médecine Paris-Sud, Le Kremlin-Bicêtre F-94276, France.

Pediatric Research
|June 23, 2009
PubMed
Summary

Newborn infants exhibit partial aldosterone resistance, impacting water and sodium balance. Urinary aldosterone levels, not plasma, best indicate mineralocorticoid sensitivity in neonates.

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Last Updated: Jun 22, 2026

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Published on: April 28, 2023

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Area of Science:

  • Neonatal physiology
  • Endocrinology
  • Renal function

Background:

  • The neonatal kidney has limited ability to regulate water and sodium homeostasis.
  • This immaturity resembles partial aldosterone resistance in newborn infants.
  • Understanding neonatal hormonal sensitivity is crucial for infant health.

Purpose of the Study:

  • To assess hormonal insensitivity to aldosterone in newborn infants.
  • To determine the relationship between aldosterone insensitivity and neonatal sodium handling.
  • To characterize the renin-aldosterone axis in the neonatal period.

Main Methods:

  • Prospective study of 48 healthy newborns and their mothers.
  • Measurement of aldosterone, renin, and electrolytes in umbilical cord and maternal plasma.
  • Determination of urinary aldosterone and sodium excretion within 24 hours post-birth.

Main Results:

  • Newborns showed significantly higher aldosterone and renin levels than mothers (p < 0.001).
  • Neonates exhibited hyponatremia, hyperkalemia, and high urinary sodium loss, indicating partial aldosterone resistance.
  • Urinary aldosterone concentration correlated strongly with plasma potassium, serving as a key indicator of mineralocorticoid sensitivity.

Conclusions:

  • Physiologic partial aldosterone resistance is evident in the neonatal period.
  • Urinary aldosterone concentration is a reliable marker for evaluating mineralocorticoid sensitivity in infants.
  • This study provides a comprehensive analysis of the renin-aldosterone axis in newborns.