Quick Bedside Calculation of QT interval
T-waves should end before the midpoint of the R-R interval.
Beware of a prolonged QT-interval when the T-wave ends after the midpoint of the R-R interval.
Differential for Prolonged QT-intervals caused by a prolonged T wave
Hypokalemia & Hypomagnesemia
Acute coronary syndromes
Increased intracranial pressures
Na+ channel blocking drugs
What are the only 2 things that prolong the QT-interval specifically by stretching the ST-segment?
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