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Old 03-07-2012
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Question contraction alkalosis

contraction alkalosis, caused by free water deficit.
The patient is alkalotic due to an increase in the strong ion difference (SID between sodium + potassium versus chloride). Sodium must be retained to maintain ECF volume, so potassium is sacrificed in order to maintain electroneutrality.
Frequently, however, contraction alkalosis features hyperkalemia, hyperuricemia and hyperchloremia. The treatment is free water replacement, with potassium repletion as necessary.





Why is there frequently hyperkalemia in contrction alkalosis???
any explanation please?
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Old 03-08-2012
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any help please
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Old 03-08-2012
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I thought hypokalemia was more typical of contraction alkalosis, because of increased aldosterone -> potassium wasting. Have you found any other sources that say that hyperkalemia often occurs? Maybe it's a typo?
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Old 03-08-2012
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Quote:
Originally Posted by Mondoshawan View Post
I thought hypokalemia was more typical of contraction alkalosis, because of increased aldosterone -> potassium wasting. Have you found any other sources that say that hyperkalemia often occurs? Maybe it's a typo?
yea makes it really confusing. i dont think its typo based on it saying "however"..

had a question today with:
ph: 7.45 k: 6.1 high HCO3 with hypotension, low CO

answer was hemorrhage. i guess the mechanism is contraction alkalosis right?
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Old 03-08-2012
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Weird - sounds like volume contraction, but I don't know if contraction alkalosis would happen so quickly with acute hemorrhage or not. Maybe a mild respiratory alkalosis?
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Acid-Base-, Electrolytes-, Physiology-, Renal-

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