1.   When other Markers of electrical instability are used such as late potentials or programmed ventricular stimulation this relationship still holds.

2.   Electrophysiological studies with premature ventricular stimulation generally do not induce ventricular arrhythmias.

3.   Programmed ventricular stimulation not only helps to guide the selection of antiarrhythmic drug therapy but also provides important prognostic information.

4.   Electrophysiological assessment should not be limited to programmed ventricular stimulation but should include a comprehensive evaluation of sinus node, AV node, and His-Purkinje function.