PREMATURE VENTRICULAR CONTRACTION (PVC)

Rate:              Usually WNL, but depends on the

                       underlying rhythm

Rhythm:          Essentially regular                   

P Waves:         Usually absent

PR Interval:    None

QRS Complex: Usually 0.12 sec or greater, wide and

                         bizzare; T wave usually in opposite

                         direction of QRS

VENTRICULAR TACHYCARDIA

(polymorphic)

Rate:              150 - 300 bpm; typically 200 - 250

Rhythm:          May be regular, or irregular                     

P Waves:         None

PR Interval:    None

QRS Complex: 0.12 sec or greater

VENTRICULAR FIBRILLATION

Rate:              Cannot be determined, there are no

                       discernable waves or complexes

Rhythm:          Rapid and caotic with no pattern or  

                        regularity                   

P Waves:         Not identifiable 

PR Interval:    Not identifiable

QRS Complex: Not identifiable 

ASYSTOLE

Rate:              No discernable Rate

Rhythm:          Irregular                     

P Waves:         None

PR Interval:    None

QRS Complex: None