A patient with a wide QRS complex and a 'bunny ear' pattern is likely experiencing which condition?

The presence of a wide QRS complex along with a 'bunny ear' pattern indicates a right bundle branch block (RBBB). In this scenario, the electrical impulse traveling through the ventricles is delayed due to a blockage in the right bundle branch, which is responsible for conducting impulses to the right ventricle. As a result, the QRS complex becomes wider than normal—typically greater than 0.12 seconds. The 'bunny ear' appearance is characteristic of RBBB on an electrocardiogram (ECG) and typically appears as an exaggerated waveform, showing two peaks that resemble bunny ears.

Left bundle branch block (LBBB) does also produce a wide QRS complex but has a different morphology on the ECG, typically demonstrating a more pronounced downward deflection in the left leads instead of the bunny ears seen in RBBB. Normal sinus rhythm would not present with a wide QRS complex, as it indicates normal conduction through the ventricles. While a myocardial infarction could lead to changes in the QRS duration, it does not specifically exhibit the traits of a 'bunny ear' pattern in the same manner as RBBB, which is specifically tied to a right bundle branch conduction disturbance. Thus, the correct identification of