In this episode, we review QT prolongation and QT shortening. What is the QT interval, and how is it corrected (QTc) for heart rate variations? Which arrhythmogenic syndromes are associated with mutations in KCNQ1, KCNH2, and SCN5A? How do the T waves of long QT syndrome types 1, 2, and 3 differ? Which long QT syndrome is suggested by arrhythmia triggered from swimming? Which long QT syndrome is suggested by arrhythmia from noises and auditory triggers? Which long QT syndrome will need addition of mexiletine (on top of nadolol) sooner? What are the QT and QRS effects of hypocalcemia, hypomagnesemia, and hypokalemia? What is the definition of a prominent U wave? What is the criteria for short QT syndrome? Tune in for answers to these questions.

Difficulty Level: Intermediate

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