Final answer:
A diagnosis of Atrial Fibrillation with Premature Ventricular Contractions (PVCs) is suggested by an ECG showing an abnormal electrical pattern before the QRS complex and irregular heart rate with early, wide QRS complexes indicative of PVCs.
Step-by-step explanation:
The most likely diagnosis based on the given ECG would be Atrial Fibrillation with Premature Ventricular Contractions (PVCs). This diagnosis is suggested by the description of the electrical pattern being abnormal prior to the QRS complex and an increased frequency between the QRS complexes. In atrial fibrillation, the atria beat irregularly and out of coordination with the ventricles, and this chaotic rhythm can be identified on an ECG by the presence of irregular P waves and a variable heart rate with occasional extra beats, presenting as PVCs.
Premature Ventricular Contractions (PVCs) are extra heartbeats that originate in the ventricles and disrupt the normal heart rhythm. PVCs can be observed on an ECG as wide and abnormal QRS complexes occurring earlier than the next expected beat. The combination of these two findings on the ECG – irregular atrial activity and the presence of PVCs – supports the diagnosis of atrial fibrillation with PVCs.