On (b)(6) 2014, a patient was undergoing a very long (greater than 4 hours) re-do cabg x4 (coronary artery bypass graft) procedure.Approximately 3 hours into cpb, the arterial pa02 gradually dropped and the pac02 gradually increased.The fi02 and gas flow were raised to compensate for the degrading values.The oxygenator was changed out, after approximately 252 minutes on bypass, while additional veins were harvested for the procedure.Cpb was reinstated within 15 minutes.Estimated blood loss from the change out of the oxygenator was approximately 300ml.It was noted from the pump records that the recirculation line of the perfusion circuit was opened for periods of time on multiple occasions to recycle blood back through the oxygenator in order to increase the pa02 and decrease the pac02 in the blood.The procedure was completed as scheduled.Cpb was halted to a period of 15 minutes to harvest more vein to allow for the bypass of another coronary artery.The patient was noted to have some neurological deficit after the procedure; however, the patient later returned to full function.The patient was discharged to home on (b)(6) 2014.
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