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Related Concept Videos

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...
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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.
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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...
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Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Two-photon Imaging of Intracellular Ca2+ Handling and Nitric Oxide Production in Endothelial and Smooth Muscle Cells of an Isolated Rat Aorta
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Aldosterone resistance: structural and functional considerations and new perspectives.

Maria-Christina Zennaro1, Edwige-Ludiwyne Hubert, Fábio L Fernandes-Rosa

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Type 1 pseudohypoaldosteronism (PHA1) is a rare genetic disorder caused by mutations affecting aldosterone response. This review details PHA1

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Area of Science:

  • Nephrology
  • Endocrinology
  • Genetics

Background:

  • Aldosterone is crucial for fluid and electrolyte balance in the kidney.
  • Mutations in mineralocorticoid receptors or ENaC cause PHA1, leading to aldosterone resistance.
  • PHA1 presents as salt wasting, dehydration, failure to thrive, hyperkalemia, and metabolic acidosis.

Purpose of the Study:

  • To review the clinical, biological, and genetic aspects of PHA1.
  • To discuss recent advances in understanding PHA1 pathogenesis.
  • To explore genotype-phenotype correlations and emerging genetic entities relevant to neonates.

Main Methods:

  • Literature review of clinical studies, genetic analyses, and biological research on PHA1.
  • Analysis of genotype-phenotype correlations.
  • Discussion of recent scientific advancements.

Main Results:

  • PHA1 encompasses diverse forms linked to specific genetic mutations.
  • Understanding pathogenesis has advanced through molecular and genetic studies.
  • Genotype-phenotype correlations are being refined.

Conclusions:

  • PHA1 is a complex genetic disorder with varied presentations.
  • Continued research is vital for improved diagnosis and management.
  • Identifying new genetic entities aids in caring for neonates with salt-losing syndromes.