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Related Concept Videos

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...
Adrenergic Receptors: ɑ Subtype01:31

Adrenergic Receptors: ɑ Subtype

Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase C—inositol-1,4,5-trisphosphate...
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...
Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers01:17

Adrenergic Antagonists: Chemistry and Classification of ɑ-Receptor Blockers

Adrenergic antagonists, or sympatholytics, inhibit adrenoceptor activation driven by catecholamines or agonists. Based on their adrenoceptor specificity, adrenergic blockers can be categorized into two primary groups: α-adrenergic blockers (α-blockers) and β-adrenergic blockers (β-blockers). α-blockers interact with α1 and α2 subtypes of α-adrenoceptors.
Nonselective α-blockers: Nonselective α-blockers contain haloalkylamine or imidazoline moieties. Phenoxybenzamine, with a haloalkylamine...
Cushing Syndrome I: Introduction01:26

Cushing Syndrome I: Introduction

Cushing syndrome refers to the collection of clinical manifestations that arise when tissues are exposed to excessive amounts of cortisol or cortisol-like medications over an extended period. Cortisol, a glucocorticoid produced by the adrenal cortex, regulates metabolism, immune responses, and the body’s adaptation to stress. When its concentration remains chronically elevated, these physiological pathways become dysregulated, resulting in the characteristic features of the syndrome.Exogenous...
Cushing Syndrome II: Pathophysiology01:19

Cushing Syndrome II: Pathophysiology

Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...

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Related Experiment Video

Updated: May 17, 2026

A Novel Method: Super-selective Adrenal Venous Sampling
06:08

A Novel Method: Super-selective Adrenal Venous Sampling

Published on: September 15, 2017

Primary hyperaldosteronism: challenges in subtype classification.

Brian T Layden1, Allison J Hahr, Dina M Elaraj

  • 1Division of Endocrinology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA. b-layden@northwestern.edu

BMC Research Notes
|November 1, 2012
PubMed
Summary

Diagnosing primary hyperaldosteronism (PA) subtypes can be challenging. Repeated adrenal gland imaging successfully identified an adenoma missed on initial CT and MRI, leading to curative treatment.

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Last Updated: May 17, 2026

A Novel Method: Super-selective Adrenal Venous Sampling
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Published on: September 15, 2017

Use of Ultra-high Field MRI in Small Rodent Models of Polycystic Kidney Disease for In Vivo Phenotyping and Drug Monitoring
07:35

Use of Ultra-high Field MRI in Small Rodent Models of Polycystic Kidney Disease for In Vivo Phenotyping and Drug Monitoring

Published on: June 23, 2015

Area of Science:

  • Endocrinology
  • Medical Imaging
  • Nephrology

Background:

  • Primary hyperaldosteronism (PA) is a significant endocrine disorder characterized by excessive aldosterone secretion.
  • Accurate subtype classification is crucial for effective patient management and treatment strategies.
  • Established guidelines exist for PA diagnosis and subtype differentiation, yet challenges remain in complex cases.

Observation:

  • A 29-year-old woman with diagnosed PA presented with uncontrolled hypertension and hypokalemia, but an unclear subtype.
  • Initial diagnostic workup included elevated aldosterone-to-renin ratio, confirmed PA via saline infusion test, and inconclusive adrenal venous sampling.
  • Initial CT and MRI scans of the adrenal glands revealed no abnormalities.

Findings:

  • Reimaging of the adrenal glands one year later identified a 2 cm left adrenal adenoma.
  • Laparoscopic left adrenalectomy was performed, leading to significant improvement in hypertension.
  • The patient experienced a complete resolution of hypokalemia following the adrenalectomy, indicating a cure.

Implications:

  • This case highlights the importance of considering repeated imaging in challenging PA subtype classifications.
  • Delayed detection of adrenal adenomas can occur even with advanced imaging modalities.
  • Successful surgical intervention underscores the curable nature of PA when the underlying cause is identified and treated.