Potassium, ECGs and QT interval

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Terence
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Potassium, ECGs and QT interval

Post by Terence » Thu Jan 26, 2006 3:36 pm

Any clinicians out there...?

The QT interval of an ECG is known to lengthen when plasma postassium falls. This is due to delayed repolarization. Repolarization is an event driven by voltage gated potassium channels. But if plasma potassium is lower then the electro-chemical gradient for postassium flowing out of the cardiac myocyte will be higher. Surely then the cell will repolarize faster and the QT interval will be shortened, not lengthened!!

I have googled this to death, but no clarification. Can anyone help? Please?

Thanks,

Terence

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