Hyperkalemic hyperchloremic metabolic acidosis in sickle cell hemoglobinopathies

Area of Science:

• Nephrology
• Hematology
• Internal Medicine

Background:

• Sickle cell hemoglobinopathies are inherited blood disorders.
• Metabolic acidosis with high potassium and chloride levels is a serious condition.
• The renal mechanisms underlying this acidosis in sickle cell disease are not fully understood.

Purpose of the Study:

• To investigate the occurrence and underlying mechanisms of hyperkalemic hyperchloremic metabolic acidosis in patients with sickle cell hemoglobinopathies.

Main Methods:

• Case series of six patients with sickle cell hemoglobinopathies (anemia, trait, S-C disease).
• Assessment of renal potassium excretion using fractional potassium excretion (FKE).
• Evaluation of urinary acidification capacity and ammonium excretion during systemic acidosis.

Main Results:

• All patients exhibited decreased renal potassium excretion (low FKE) compared to controls.
• Two patterns of impaired urinary acidification were observed: distal renal tubular acidosis and selective aldosterone deficiency.
• Four patients had distal renal tubular acidosis, and two had selective aldosterone deficiency.

Conclusions:

• Sickle cell hemoglobinopathies are associated with hyperkalemic hyperchloremic metabolic acidosis.
• Impaired renal potassium excretion and urinary acidification are key mechanisms.
• These conditions should be considered in the differential diagnosis of metabolic acidosis in affected individuals.