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Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

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...

Hormonal Regulation

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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.

Antihypertensive Drugs: Angiotensin II Receptor Blockers

Antihypertensive Drugs: Angiotensin II Receptor Blockers

In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...

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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...

Antihypertensive Drugs: Direct Renin Inhibitors

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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

Updated: Jul 10, 2026

Isolation and Adoptive Transfer of High Salt Treated Antigen-presenting Dendritic Cells

Isolation and Adoptive Transfer of High Salt Treated Antigen-presenting Dendritic Cells

Published on: March 5, 2019

Aldosterone and refractory hypertension.

Moffat J Nyirenda¹, Paul L Padfield

¹Endocrinology Unit, The Queen's Medical Research Institute, University of Edinburgh, Edinburgh, Scotland, UK.

Current Opinion in Endocrinology, Diabetes, and Obesity

|October 18, 2007

Summary

Refractory hypertension is rising, with increased aldosterone activity a key factor. Aldosterone antagonists show promise for blood pressure control in these patients, though more research is needed.

Related Experiment Videos

Last Updated: Jul 10, 2026

Isolation and Adoptive Transfer of High Salt Treated Antigen-presenting Dendritic Cells

Isolation and Adoptive Transfer of High Salt Treated Antigen-presenting Dendritic Cells

Published on: March 5, 2019

Area of Science:

Cardiology
Endocrinology
Nephrology

Background:

Refractory hypertension is increasingly prevalent, with unclear underlying mechanisms.
Emerging evidence suggests elevated aldosterone activity contributes to resistance against standard antihypertensive therapies.

Purpose of the Study:

To review the role of aldosterone in refractory hypertension.
To examine the prevalence and management of primary aldosteronism in this patient group.

Main Methods:

Literature review of clinical trials and epidemiological studies.
Analysis of recent reports on aldosterone-to-renin ratio screening.
Evaluation of aldosterone antagonist efficacy in refractory hypertension.

Main Results:

Primary aldosteronism prevalence is rising among hypertensive patients.
Relative aldosterone excess is common in refractory hypertension.
Aldosterone antagonists improve blood pressure control in these patients.

Conclusions:

Aldosterone plays a significant role in hypertension pathogenesis.
Primary aldosteronism requires better definition across its spectrum.
While aldosterone blockade shows benefit, robust randomized trial data are pending.