Consider the following medical report that includes the patient's historical health records. Use it to predict the disease that the patient is high likely exposed to. 

 Medical Report: addendum: the patient was initially scheduled for discharge on postoperative day number four, ; however, the patient was noted to have diminished oxygen saturations on the evening of postoperative day number three and was subsequently kept for observation over the course of postoperative day number four. with aggressive chest physical therapy, ambulation, and incentive spirometry, the patient demonstrated significant clinical improvement over the course of postoperative day number four and was subsequently cleared for discharge on postoperative day number five, . please see original discharge summary for discharge medications and discharge instructions. , m.d. dictated by: medquist36 procedure: single internal mammary-coronary artery bypass extracorporeal circulation auxiliary to open heart surgery (aorto)coronary bypass of one coronary artery diagnoses: coronary atherosclerosis of native coronary artery intermediate coronary syndrome tobacco use disorder 

Answer: The patient is high likely exposed to