To obtain an atrial electrogram from an epicardial pacing wire, what connection should be made?

To obtain an atrial electrogram from an epicardial pacing wire, connecting the atrial pacing wire to the chest lead on the monitor and selecting the 'V' lead is the appropriate choice. This method utilizes the epicardial pacing wire properly to capture the electrical activity from the atria, allowing for accurate monitoring of atrial electrograms.

Selecting a 'V' lead is essential when capturing signals from epicardial wires because the 'V' leads represent precordial leads that are positioned to best detect the electrical activity originating from the heart. This positioning captures the electrical signals in a way that reflects atrial contractions effectively, making it suitable for monitoring atrial electrograms.

Other options may not correctly facilitate the needed atrial electrogram. For instance, using a ventricular pacing wire or connecting the atrial pacing wire to inappropriate electrodes would not capture the desired atrial activity or would introduce misleading signals. Therefore, the specific connection and lead selection are vital for obtaining accurate readings from the epicardial pacing wire.