[Hyperkalemia - what the general practitioner must know]

Area of Science:

• Internal Medicine
• Nephrology
• Clinical Pathology

Context:

• Hyperkalemia poses a diagnostic dilemma for general practitioners, ranging from benign to life-threatening presentations.
• Accurate differentiation is crucial for timely and appropriate patient management.
• Initial assessments can often be performed within a general practice setting.

Purpose:

• To outline a diagnostic approach for hyperkalemia in primary care.
• To differentiate between various causes of elevated serum potassium.
• To guide general practitioners on when to refer patients to specialized care.

Summary:

• Four primary differential diagnoses for hyperkalemia include pre-analytical causes, potassium release from cell lysis, transcellular shifts, and reduced renal excretion.
• Medical history, particularly medication review, and initial clinical/laboratory investigations are vital first steps.
• Persistent or unexplained hyperkalemia necessitates investigation for underlying renal, endocrine, or cardiac conditions.

Impact:

• Provides a structured diagnostic framework for general practitioners managing hyperkalemia.
• Aims to reduce diagnostic delays and improve patient outcomes for hyperkalemia.
• Highlights the importance of recognizing serious underlying conditions requiring specialist referral.