Electrolyte Emergencies

Sodium is the primary ion affecting the QRS complex. Potassium is the primary ion affecting T waves. If there is a QT abnormality, you should check a serum calcium - Luke Lawton

Electrolyte Emergencies

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Electrolytes and the Heart

I was talking to a group of my junior registrars the other day about cardiac physiology, and I was struck by how much trouble they seemed to have relating electrolytes to the QRS complex. We sat down and nutted it all out which left everyone happy. The key to understanding the effects of electrolytes is to understand the cardiac action potential, and how it relates to the QRST complex seen on an ECG.

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 Electrolytes and the Heart

One of the hardest things to do is to remember what the effects of different electrolyte imbalances are on the ECG. But, if you remember the basic physiology of electrolytes, it’s dead simple.

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