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Chloride-Resistant Metabolic Alkalosis

In most cases of chloride-resistant metabolic alkalosis, patients are losing chloride in their urine because they are in a state of mineralocorticoid excess.  Sodium is recovered at the expense of protons and potassium, thus these conditions are associated with hypokalemia.  While most bicarbonate is recovered by proximal filtration, chloride is lost to balance the charge on the excreted cations.

Several (rare) hereditary conditions result in this sort of alkalois, including Bartter's and Gitelman's Syndromes.  In both syndromes, blood pressure is generally normal.  However, blood pressure is elevated with most other causes of chloride resistant metabolic alkalosis which include: renal artery stenosis, renin-secreting tumors, congential adrenal hyperplasia (11 beta-hydroxylase deficiency), administration of exogenous mineralocorticoids, primary aldosteronism, Cushing Syndrome and Liddle Syndrome.

In states of hyperaldosteronism, antagonists such as sprinolactone or amiloride can correct the hypertension, hypokalemia and will restore the acid-base status.  In Barrter sydrome indomethacin treatment is administered to counteract the hypersecretion of renal prostaglandins.
 
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Last modification: April 30, 1998