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Related Concept Videos

Hypertension and Regulation of Blood Pressure01:18

Hypertension and Regulation of Blood Pressure

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Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
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Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors

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Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
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Antihypertensive Drugs: Angiotensin II Receptor Blockers01:30

Antihypertensive Drugs: Angiotensin II Receptor Blockers

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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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Antihypertensive Drugs: Direct Renin Inhibitors01:25

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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Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

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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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Hypertension II: Pathophysiology01:29

Hypertension II: Pathophysiology

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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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Related Experiment Video

Updated: May 5, 2026

5/6th Nephrectomy in Combination with High Salt Diet and Nitric Oxide Synthase Inhibition to Induce Chronic Kidney Disease in the Lewis Rat
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5/6th Nephrectomy in Combination with High Salt Diet and Nitric Oxide Synthase Inhibition to Induce Chronic Kidney Disease in the Lewis Rat

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Low renin hypertension.

J C Gunnells, W L McGuffin

    Annual Review of Medicine
    |January 11, 1975
    PubMed
    Summary

    Low renin hypertension involves various conditions, often linked to excess body fluid. Diuretics like spironolactone or thiazides effectively lower blood pressure in most patients with this condition.

    Area of Science:

    • Nephrology
    • Endocrinology
    • Cardiovascular Medicine

    Background:

    • Low renin hypertension encompasses a range of conditions, including primary aldosteronism and other mineralocorticoid disorders.
    • A significant portion of patients with low renin hypertension lack identifiable mineralocorticoid production abnormalities.
    • Evidence indicates that volume excess plays a crucial role in the development of hypertension in these patients.

    Purpose of the Study:

    • To explore the spectrum of pathophysiology in low renin hypertension.
    • To highlight the importance of further physiological studies for a comprehensive understanding.
    • To review current evidence supporting treatment strategies for low renin hypertension.

    Main Methods:

    • Literature review of existing studies on low renin hypertension.

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  • Analysis of evidence implicating volume excess in disease pathogenesis.
  • Evaluation of treatment efficacy based on published data.

    • Main Results:

    • The largest group of patients with low renin hypertension shows no clear mineralocorticoid production defect.
    • Volume excess is strongly suggested as a key factor in hypertension development.
    • Diuretic therapy, specifically spironolactone or thiazides, is generally effective in normalizing blood pressure.

    Conclusions:

    • Low renin hypertension is a complex condition requiring further research into its pathophysiology.
    • Despite ongoing studies, current evidence supports prompt treatment for these patients.
    • Diuretic administration is a primary and effective therapeutic approach for managing low renin hypertension.