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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.
Adrenal Gland Disorders01:27

Adrenal Gland Disorders

Adrenal gland disorders manifest when the production of adrenal hormones deviates from the norm, resulting in either excessive or insufficient concentrations.
Adrenal insufficiency, characterized by insufficient cortisol and aldosterone production, leads to conditions like Addison's disease. This disorder, affecting the adrenal cortex, exhibits symptoms such as skin bronzing, dehydration, low blood pressure, fatigue, and weight loss. Congenital adrenal hyperplasia, a genetic ailment causing...
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...
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...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...

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Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
12:03

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors

Published on: June 7, 2016

Aging and aldosterone.

R Hegstad, R D Brown, N S Jiang

    The American Journal of Medicine
    |March 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Aldosterone secretion declines with age, with older adults showing lower urinary and plasma levels. Age-adjusted reference ranges are crucial for diagnosing primary aldosteronism in elderly hypertensive patients.

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    Area of Science:

    • Endocrinology
    • Gerontology
    • Nephrology

    Background:

    • Aldosterone plays a key role in regulating blood pressure and electrolyte balance.
    • Age-related changes in endocrine function are common but not fully understood for aldosterone.

    Purpose of the Study:

    • To investigate the impact of aging on aldosterone levels and secretion.
    • To determine if age-adjusted reference ranges are necessary for accurate diagnosis of hyperaldosteronism.

    Main Methods:

    • Measured urinary and plasma aldosterone in subjects aged 20-59 years under unrestricted sodium intake and sodium depletion.
    • Compared aldosterone levels between younger (<30 years) and older (>50 years) age groups.
    • Evaluated aldosterone-producing adenoma patients over 40 years using age-adjusted and non-adjusted ranges.

    Main Results:

    • Older adults (>50 years) exhibited lower urinary aldosterone excretion and lower upright plasma aldosterone concentrations compared to younger adults (<30 years).
    • Plasma aldosterone levels were similar between age groups when recumbent and on unrestricted sodium.
    • Age-adjusted ranges identified more cases of hyperaldosteronism in older patients with aldosterone-producing adenoma.

    Conclusions:

    • Aldosterone secretion significantly declines with advancing age.
    • Age-specific reference ranges are essential for accurate assessment of aldosterone levels, particularly in older hypertensive individuals.
    • Failure to use age-adjusted ranges may lead to underdiagnosis of primary aldosteronism in the elderly.