QT dispersion is a marker for life-threatening ventricular arrhythmias after atrioventricular nodal ablation using radiofrequency energy.

@article{Conti1997QTDI,
  title={QT dispersion is a marker for life-threatening ventricular arrhythmias after atrioventricular nodal ablation using radiofrequency energy.},
  author={Jamie Beth Conti and Roger M Mills and D A Woodard and Anne B Curtis},
  journal={The American journal of cardiology},
  year={1997},
  volume={79 10},
  pages={1412-4}
}
QT dispersion has been cited as a measure of nonuniform myocardial repolarization and a predictor of sudden cardiac death. We describe 38 patients who underwent atrioventricular nodal ablation, 3 of whom had an increase in measured QT dispersion and experienced potentially fatal, pulseless, polymorphic ventricular tachycardia after the procedure.