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: history of present illness: the patient is a 62-year-old fire fighter who first developed severe chest tightness 15 years ago during strenuous activity. he was admitted to hospital, where he subsequently ruled out for a myocardial infarction. a cardiac catheterization performed during that admission was remarkable for normal coronary arteries. he had been relatively well since then with only minimal chest tightness on exertion. he had no pain or tightness at rest. approximately one year ago, the patient noted the onset of dizziness during exertion. this subsequently progressed to where it would occur at rest or with exertion. the patient denied losing consciousness, but the episodes were intermittently associated with diaphoresis and nausea. over the last couple of months prior to admission, the symptoms had progressed, occurring more frequently and becoming greater in severity. these were occasionally associated with dyspnea on exertion. a holter monitor on revealed sinus bradycardia with a heart rate in the 30s and occasional atrial premature contractions but no significant pauses. an echocardiogram on was significant for mild symmetric hypertrophy, an ejection fraction of approximately 50%, severe thickening of the aortic valve with a peak aortic valve gradient of 59 and a mean aortic valve gradient of 25 and severe aortic stenosis. the patient was now having presyncopal episodes on exertion twice a week. the patient denied orthopnea, paroxysmal nocturnal dyspnea, pedal edema, claudication, a history of diabetes mellitus and a family history. past medical history: the past medical history was significant for hypertension, chronic back pain, right rotator cuff injury and status post appendectomy. medications on admission: diovan 80 mg p.o. q.d. physical examination: on admission head, eyes, ears, nose and throat examination, the neck was supple with no bruits. the pulmonary examination was clear to auscultation and percussion. the heart was a regular rate and rhythm with a iii/vi systolic ejection murmur at the base radiating to the bilateral carotid arteries. the abdomen was soft, nontender and nondistended. the extremities were warm and well perfused, without edema. hospital course: the patient was admitted to the service, where he underwent a cardiac catheterization on , which revealed normal coronary arteries with only minimal luminal irregularities, severe aortic stenosis and normal ventricular function. there were no wall motion abnormalities and no mitral regurgitation. there were no complications from the catheterization. the patient's subsequent course was uneventful until the day of surgery. on , the patient underwent an uncomplicated aortic valve replacement with a 24 mm bentall homograft. the patient tolerated the procedure well and was transported to the intensive care unit intubated. on the evening of postoperative day #0, the patient was extubated without incident. he was atrially paced with an underlying sinus bradycardia in the 60s without ventricular ectopy. intravenous nitroglycerin was discontinued and nipride was started with his systolic blood pressure in the 100s. he was started on a sliding scale regular insulin for hyperglycemia. overnight, his nipride was weaned and his chest tube had put out 380 cc of serosanguinous fluid without evidence of an air leak. on the morning of postoperative day #1, his nipride was turned off. because of his underlying sinus bradycardia, there was a question of whether or not the patient was going to need to have a permanent pacemaker placed. the cardiology service was consulted, who felt that, as the patient was in excellent health prior to the procedure and he had a history of heart rates in the 50s at baseline, there would be no current indication for placement of a permanent pacemaker. they recommended that the patient follow up with his cardiologist, dr. , one month after discharge from the hospital. the patient was noted to have what appeared to be an infected tooth. therefore, he was started on a course of clindamycin for prophylaxis against bacterial endocarditis of the valve. the patient had a subsequently uneventful course. he had a chest x-ray on that demonstrated some left lower atelectasis but no new pneumothorax after his chest tubes had been removed. his foley catheter was discontinued on postoperative day #1, but he failed a voiding trial and needed to have foley catheter replaced. he subsequently had the foley catheter removed on the night of postoperative day #3 and successfully voided on the morning of discharge. the patient had successfully completed level 5 of activity by postoperative day #3 and was thus discharged to home on postoperative day #4, having remained afebrile, tolerating p.o. intake and making adequate urine. his physical therapist recommended that he have a home safety evaluation after discharge. discharge examination: the patient was afebrile with a heart rate of 64, a blood pressure of 132/74, a respiratory rate of 18 and an oxygen saturation of 94% on room air. he was in no acute distress. he had diminished breath sounds on the right with a stable sternum and incisions that were clean, dry and intact. he had a regular rate and rhythm. the abdomen was soft, nontender and nondistended. the extremities were warm and well perfused. laboratory data: the patient had a white blood cell count of 11,200, down from 13,200. discharge medications: 1. percocet one to two tablets p.o. every three to four hours p.r.n. for pain. 2. clindamycin 450 mg p.o. q.i.d. 3. enteric coated aspirin 81 mg p.o. q.d. 4. lasix 20 mg p.o. b.i.d. times one week. 5. potassium chloride 20 meq p.o. b.i.d. times one week. 6. colace 100 mg p.o. b.i.d. condition on discharge: stable. disposition: the patient is discharged to home with home physical therapy services for cardiopulmonary checks. discharge diagnoses: critical aortic stenosis, status post bentall aortic valve replacement. , m.d. dictated by: medquist36 procedure: combined right and left heart cardiac catheterization coronary arteriography using two catheters angiocardiography of left heart structures open and other replacement of aortic valve resection of vessel with replacement, thoracic vessels diagnoses: unspecified essential hypertension aortic valve disorders other specified cardiac dysrhythmias family history of ischemic heart disease periapical abscess without sinus 

Answer: The patient is high likely exposed to