Identifying Rapid Ventricular Response (RVR) on an ECG requires careful assessment of several key factors. First, observe the heart rate, which is typically elevated in RVR. Next, examine the QRS complexes for irregularities or widening. Additionally, analyze the atrial activity to determine if atrial fibrillation or flutter is present. A systematic approach to ECG interpretation can help accurately diagnose RVR and facilitate appropriate treatment.