Potassium abnormalities


Share on facebook
Share on twitter
Share on linkedin
Share on whatsapp


K + < 2.5 mmol/L:

  • Prominent U wave develops with apparent prolongation of the QTc
  • Flat or diphasic T waves
  • ST segment depression

As K + falls further:

  • PR interval prolongs
  • Sinoatrial block may occur



As K + rises:

  • Tall peaked T waves, best seen in precordial leads
  • Prolongation of QRS duration
  • Prolongation of PR interval
  • Disappearance of P waves
  • Wide bizarre diphasic QRS complexes (sine waves)
  • Eventual asystole


potassium and ecgs

About the authors


High flow therapy – when and how?

Chest compressions in traumatic cardiac arrest

Searching for sepsis

The missing link? Children and transmission of SARS-CoV-2

Don’t Forget the Brain Busters – Round 2

An evidence summary of Paediatric COVID-19 literature

Global Developmental Delay


Foot x-rays

The fidget spinner craze – the good, the bad and the ugly

Parenteral Nutrition