Recently I was recovering a patient from open heart surgery and the patient had av pacing wires connected to a dual chamber packing box. The surgeon wanted the patient a paced at a rate of 80 with v pacing backup at 50. We could not figure out how to do this. Ultimately, we increased the av interval on the pacer which prevented v pacing unless a qrs was not sensed within 270ms. Does anyone have an opinion on this? Was there another option? The MD had not idea how to program the box for what he wanted. thank you