paganini
Forum Senior
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A patient with severe congestive heart failure is secreting large quantities of aldosterone. Is the rate of potassium excretion normal, high, or low?
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| new_n_lost
Politically InCorrect
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Normal cos there is Renal Vasoconstriction due to the Blood being Shifted to the Circulation to maintain Near Normal BP thus there is Already Renal Vasoconstriction Now If the Massive Amounts of Aldosterone wasnt present then we wud have Low Postassium Secretion.
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| silver
Forum Guru
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Normal
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| paganini
Forum Senior
Topics: 26
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yeah. is normal. One may have answered "high," assuming that the increased aldosterone would stimulate potassium secretion. However, this effect is more than balanced by the fact that the patient has a decrease in flow of fluid into the cortical collecting duct (because of decreased GFR and increased proximal and loop reabsorption). Recall that potassium secretion is impaired when the amount of fluid flowing through the cortical collecting duct is reduced. This explains why patients with the diseases of secondary hyperaldosteronism with edema do not lose large quantities of potassium, whereas those with primary hyperaldosteronism do.
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| drduck
Forum Guru
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thanks alot all of u..........i had no idea of this....
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