Left ventricular rhythms in V1 could mimic which of the following?

When interpreting electrocardiograms (ECGs), left ventricular rhythms can indeed resemble patterns seen in a right bundle branch block (RBBB). In V1, the presence of a left ventricular rhythm, particularly if there is a wide QRS complex, can lead to a similar appearance of the changes typically seen in RBBB, such as rSR' morphology or a prominent S wave.

The T wave inversion present in left ventricular rhythms might also be misinterpreted as affecting the QRS complexes in a way that mimics RBBB characteristics. This can create confusion about the underlying cardiac rhythm when focusing solely on the V1 lead. Additionally, other aspects like the QRS duration or overall morphology can reinforce this resemblance.

On the other hand, left bundle branch block (LBBB) has distinctive criteria that would typically differentiate it from left ventricular rhythms, such as a widened QRS complex with a characteristic pattern in the lateral leads (I, aVL, V5, V6). Normal sinus rhythms and atrial fibrillation have very different configurations and characteristics, which would not appear similar to left ventricular rhythms in the manner seen with RBBB patterns in V1.

Thus, recognizing the nuances between the different types of conduction disturbances is crucial for accurate ECG