HTN and electrolytes

[seminoma]

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"A study of persons with essential hypertension is performed. They have blood pressures in the range of 140/90 to 160/100 mm Hg. Laboratory studies show normal serum electrolyte values. Which of the following physiologic abnormalities is most likely to account for their hypertension?"

1. Hyperreninemia
2. Hyperaldosteronism
3. Decreased natriuretic peptide
4. Decreased ACE
5. Sodium retention
6. Catecholamine excess




Answer: Sodium retention.
How can serum electrolytes be normal if you are retaining excess sodium?

 

[Transposony]

Remember, Na always brings H2O with it.

 

[seminoma]

Remember, Na always brings H2O with it.

Which explains why sodium isn't high, but what about the dilution of other electrolytes?

 

[Transposony]

Which explains why sodium isn't high, but what about the dilution of other electrolytes?

It's a very slow process so the body has time to correct.