Lastly measurement of peripheral artery blood pressure will be accomplished with a right radial arterial catheter. Prior to the start of surgery, the patient will receive a special catheter in the radial artery of their right arm. This is the standard of care for blood pressure monitoring in this type of surgery. At the same times during the surgery that the pressure is being measured from the aortic catheter, the pressure will be measured from the catheter in the right radial artery.