What term describes a premature ventricular contraction (PVC) where the QRS complexes have the same configuration each time?

The term that accurately describes a premature ventricular contraction (PVC) where the QRS complexes exhibit the same configuration each time is “monomorphic.” Monomorphic PVCs signify that the extra heartbeats have a consistent shape and appearance on an electrocardiogram (ECG), which helps clinicians identify the underlying cause and evaluate the patient's cardiac rhythm.

Uniformity in the shape of the QRS complexes indicates that the PVCs arise from the same ectopic focus in the ventricles, making it easier to assess the condition. Recognizing monomorphic PVCs can provide insights into whether they are benign or indicative of underlying heart disease.

In contrast, terms like polymorphic or variable refer to QRS complexes that show differing shapes or configurations, which suggest differing ectopic foci or varying degrees of myocardial irritability. Thus, understanding the terminology helps distinguish between different types of ventricular contractions, which is crucial for accurate diagnosis and treatment.