DEFINITION
ECG Features
Three or more ventricular premature contractions in a row
May be intermittent (paroxysmal) or sustained; heart rate > 150 bpm with a regular rhythm
QRS complexes—typically wide and bizarre.
If P waves—dissociated from the QRS complexes
PATHOPHYSIOLOGY
Potentially life-threatening arrhythmia, usually signifying myocardial disease or metabolic derangement; mechanisms include increased automaticity, reentry, and delayed afterdepolarizations
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