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Cushing's Syndrome & Hypokalaemia How glucocorticoid excess causes increased urinary potassium excretion Short Answer: Yes. In Cushing's syndrome, extremely high cortisol levels overwhelm the kidney's protective enzyme ( 11β-HSD2 ), allowing cortisol to activate mineralocorticoid receptors. This mimics aldosterone, causing the kidneys to waste potassium in the urine. The Core Mechanism: Receptor "Overflow" 1. Normal Protection: The enzyme 11β-hydroxysteroid dehydrogenase type 2 (11β-HSD2) in the kidney converts active cortisol → inactive cortisone. This prevents cortisol from binding to mineralocorticoid receptors (MR), which should only respond to aldosterone. 2. In Cushing's Syndrome: Cortisol levels become so high that they saturate the 11β-HSD2 enzyme. 3. The Spillover: Excess cortisol "spills over" and binds to MR in the di...

Potassium Homeostasis: Transcellular Shifts Understanding how Insulin, Catecholamines, pH, and Aldosterone affect Serum K⁺ Is the statement correct? Mostly yes. The factors you listed (Insulin, Catecholamines, pH) primarily drive potassium into the cells, causing hypokalaemia. However, there is a critical physiological distinction regarding Aldosterone that is vital for clinical understanding. 1. Insulin Na⁺/K⁺-ATPase Activation Insulin binds to cell receptors (muscle/liver) and activates the sodium-potassium pump. Effect: Actively pumps K⁺ into the cell . Clinical Note: Treating DKA with insulin can cause a rapid drop in serum potassium. Replacement is mandatory. 2. Catecholamines β₂-Receptor Stimulation Epinephrine stimulates β₂-adrenergic recept...

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🩺 Adrenocortical Failure & Hyponatremia: The Mechanism Explained 🔬 Key Takeaway Hyponatremia in adrenocortical failure results from two main mechanisms : (1) aldosterone deficiency causing renal sodium wasting, and (2) cortisol deficiency leading to inappropriate ADH secretion and impaired free water clearance [[11]]. 📚 The Two Critical Hormones Lost When the adrenal cortex fails (Addison's disease or secondary AI), two key hormones are deficient: 🟠 Aldosterone (Mineralocorticoid) Acts on distal tubules & collecting ducts ↑ Sodium (Na⁺) reabsorption ↑ Potassium (K⁺) & H⁺ excretion Maintains blood volume & pressure 🔵 Cortisol (Glucocorticoid) Permissive effect on vascular tone Suppresses ADH (vasopressin) release Supports cardiac output & GFR Enables free water excretion ...