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




Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, June 9, 2011 1:27 pm