Just finished a CABG and the surgeon places the pacing wires. The surgeon wants to pace AAI at 90 as the native rate is around 50. The patient captures at 90 and it appears as though the pacer spikes are falling right on top of the T wave. Slowing the rate to 70, the ekg reveals a pretty significant first degree block with the pacer spike falling just about on top of the T wave as suspected. What do you need to do?