Hyperkalemia in young children: blood pressure checked?

Area of Science:

• Endocrinology
• Genetics
• Pediatrics

Background:

• Hyperkalemia in children is rare, often due to sample hemolysis.
• Familial hyperkalemic hypertension (FHHt), or pseudohypoaldosteronism type II, is a rare Mendelian syndrome.
• FHHt presents with hyperkalemia, hypertension, and metabolic acidosis despite normal kidney function.

Purpose of the Study:

• To describe two pediatric cases of FHHt.
• To highlight the importance of recognizing FHHt in young patients with hyperkalemia.
• To discuss the genetic basis and pathophysiologic pathways of FHHt.

Main Methods:

• Case report of two young patients diagnosed with FHHt.
• Clinical evaluation including blood pressure and electrolyte measurements.
• Genetic testing to identify mutations in relevant genes.

Main Results:

• Two young patients presented with incidental hyperkalemia and were diagnosed with FHHt.
• Genetic analysis revealed mutations in KLHL3 and CUL3 genes.
• Treatment with thiazide diuretics led to full recovery of abnormalities.

Conclusions:

• Clinicians should suspect FHHt in pediatric patients with hyperkalemia and normal kidney function.
• Prompt diagnosis and treatment with thiazide diuretics are essential for managing FHHt.
• Discoveries in KLHL3 and CUL3 genes advance understanding of FHHt pathophysiology.