![]() ![]() What is the length of the PR interval? Not measureable during PVCs.Is there a P wave before each QRS? Are P waves upright and uniform? Absent with PVCs.What is the rhythm? Depends on underlying rhythm irregular during PVCs.What is the rate? Atrial: usually normal ventricular: usually normal, depends on underlying rhythm.Treatment: Address underlying causes if possible. If PVCs begin to occur more frequently (> 20-40% of all beats), they may progress to the more dangerous rhythms described later. ![]() Stress and the use of stimulants make these worse. Many people have these occasionally, and they don't require treatment in an otherwise healthy heart. PVCs are the most common ventricular dysrhythmia. Premature ventricular contractions (PVCs) are ectopic extra beats. Ventricular rhythms display QRS complexes that are wide (greater than or equal to 0.12 seconds) and abnormal in appearance. P waves are absent because there is no atrial activity or depolarization. When the SA node and the AV junctional tissues fail to generate an impulse, the ventricles assume the role of pacing the heart.
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