- Clinical science
Premature ventricular contractions (PVCs) are extra, abnormal heartbeats caused by ectopic foci within the ventricles. PVCs are very common and most individuals are asymptomatic, but select patients may present with symptoms such as dizziness or palpitations. Typical ECG findings of PVCs include broad QRS complexes, compensatory pauses, and axis deviation, and may be random or have consistent patterns, such as couplets or bigeminy. Most patients do not require treatment. However, any underlying condition, e.g., myocarditis, must be managed appropriately. Patients with frequent PVCs that cause significant symptoms should receive antiarrhythmic drugs or possibly catheter ablation, as they are at risk for sudden cardiac death.
- Monomorphic PVC: Each PVC has the same configuration → identical origin
- Polymorphic PVC: PVCs have different configurations → multiple foci
- Common ECG characteristics
- QRS duration ≥ 120 ms with a block-like QRS morphology
- PVCs are often followed by a compensatory pause
- May be random or adhere to a specific pattern, including:
PVCs are a common incidental finding on routine ECGs. The detection of them does not require any further workup in patients who are asymptomatic!
- Only indicated in case of frequent, symptomatic PVCs
- 24-hour Holter monitor
- Exercise stress test