Causes of QT Widening
– (associatted with malignant V tach/ Torsades) QT : Nl QT=.39*[Sqr rt:RR; QTc = QTmeas/[Sqr rt:RR; nl<.45; – Class I – quinidine – Procainamide – Tricyclics – Phenthiazines – Disopyramide – Amiodarone – Hypokalemia, – Hypocalcemia; – ? Digoxin Causes of QT Shortening: – ? Digoxin – Hyper Ca
