What type of ECG pattern will AVR produce?

The correct answer is that AVR typically produces a downward spike on the ECG. In the standard 12-lead ECG, the AVR lead is oriented in a direction that measures electrical activity predominantly from the right upper part of the heart towards the left foot. This orientation often results in a negative deflection, or a downward spike, because it views the heart’s electrical activity from a unique angle that does not align well with the overall predominant vector of depolarization.

In contrast, other leads like those on the left side of the heart typically show positive deflections due to their positioning relative to the heart's electrical activity. The flat line would suggest no electrical activity occurring, which is not representative of what AVR shows when properly set up. Sinus rhythm is a term that indicates a normal heartbeat pattern, which is not exclusive to AVR and does not address the specific pattern generated by that lead.