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Evaluation: Lown Criteria to distinguish pathologic PVCs（premature ventricular contractions）
- Low risk of degenerating into ventricular dysrhythmia
- Class 0: No PVCs
- Class 1: <30 PVCs per hour
- Intermediate risk of degeneration
- Class 2: 30 or more PVCs per hour
- High risk of degeneration
- Class 3: Multifocal PVCs
- Class 4a: Two consecutive PVCs
- Class 4b: Three consecutive PVCs
- Class 5: R on T Phenomena
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