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Open access

Sudeep K Rajpoot, Carlos Maggi and Amrit Bhangoo

Summary

Neonatal hyperkalemia and hyponatremia are medical conditions that require an emergent diagnosis and treatment to avoid morbidity and mortality. Here, we describe the case of a 10-day-old female baby presenting with life-threatening hyperkalemia, hyponatremia, and metabolic acidosis diagnosed as autosomal dominant pseudohypoaldosteronism type 1 (PHA1). This report aims to recognize that PHA1 may present with a life-threatening arrhythmia due to severe hyperkalemia and describes the management of such cases in neonates.

Learning points

  • PHA1 may present with a life-threatening arrhythmia.
  • Presentation of PHA can be confused with congenital adrenal hyperplasia.
  • Timing and appropriate medical management in the critical care unit prevented fatality from severe neonatal PHA.