- Instruct perfusionist "Flow down" - Apply Fogarty Hydrogel aortic cross clamp - Three clicks occlusion - Announce "Cross clamp is on" - Instruct perfusionist "Flow back up, Antegrade go" - Cloth towel folded long is doubled under and over the handle of the cross clamp to prevent its movement to right or left of field and lessen manipulation of aorta - Second towel is laid out lengthwise over cross clamp and cannula