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ECG Disease Patterns
 
 

Hyperkalaemia on ECG

 
 
 
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Overview

Potassium is important in maintaining membrane potentials, particularly in cardiac myocytes. 
Hyperkalaemia, or an increased serum potassium concentration of >5mmol/L, shortens action potentials and reduces conduction velocity in cardiac myocytes.
  • Severity of Hyperkalaemia

  • Mild - 5.0 - 6.5 mmol/L
  • Moderate - 6.5 - 7.0 mmol/L
  • Severe - >7.0 mmol/L
  •  
  • ECG Findings in Hyperkalaemia

  • Mild

  • Tall, tented T waves
  • Moderate

  • Reduction in P wave height
  • Long PR interval
  • Severe

  • Short QT interval
  • Widening of QRS complex
  • Sine wave QRS pattern
  • Life-Threatening

  • Asystole
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