Serum potassium concentration in acidemic states

Area of Science:

• Nephrology
• Internal Medicine
• Biochemistry

Background:

• Acidosis is commonly believed to cause hyperkalemia due to potassium shifting from intracellular to extracellular spaces.
• However, clinical and experimental data suggest uncomplicated organic acidemias do not typically lead to hyperkalemia.

Purpose of the Study:

• To differentiate the effects of mineral acid versus organic acid-induced acidosis on serum potassium levels.
• To identify factors contributing to hyperkalemia in organic acidemia beyond the acidemia itself.

Main Methods:

• Review of clinical and experimental evidence regarding acidosis and potassium levels.
• Analysis of factors associated with hyperkalemia in various types of acidemia.

Main Results:

• Acidosis from mineral acids predictably increases serum potassium.
• Acidosis from organic acids usually shows normal serum potassium in uncomplicated cases.
• Factors like dehydration, renal disease, and diabetes can cause hyperkalemia in organic acidemia.

Conclusions:

• Uncomplicated organic acidemias do not cause hyperkalemia; elevated potassium suggests complicating factors.
• The mechanism for differing potassium shifts between mineral and organic acidemias is unclear, possibly due to anion cell penetration.
• The absence of hyperkalemia in severe acidosis may not always indicate potassium deficiency in organic acidemia.