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 59-year-old male with a prior cardiac history including asd repair in , mitral valve disease, atrial fibrillation/flutter, status post ablation. he was followed by serial echocardiograms and a recent echocardiogram showed ef greater than 55% with moderate to severe mitral regurgitation. he was schedule for mitral valve replacement. past medical history: mitral valve disease, atrial fibrillation, status post ablation. past surgical history: asd repair in . allergies: none known. medications: aspirin 325 mg q d, zestril 10 mg q d, amiodarone 200 mg q d. hospital course: the patient underwent mitral valve replacement with a #27 mosaic valve on . he was transferred to the csru post-operatively. he was a-paced on arrival in the csru with intermittent loss of capture, with hypotension. his underlying rhythm was junctional in the 40's. av pacing was attempted but ventricular ectopic activity occurred. there was loss of both a and v capture with inappropriate sensing despite various measures. he continued to be bradycardic with hypotension. he was started on dopamine, and emergent pacing swan was placed with appropriate pacing and sensing. he was also started on dopamine drip. he was extubated later on in the same day. his hemodynamic status stabilized. he was seen by dr. who is his regular electrophysiologist. subsequently he continued to be v paced with complete heart block. he was continued on his amiodarone. a tentative decision was made for pacemaker placement because of the complete heart block. on postoperative day #3 he had converted to a junctional rhythm and was maintaining his blood pressure. he was transferred to the regular floor on postoperative day #3 in a junctional rhythm with pacing wires. he was hemodynamically stable at this point. on postoperative day #4 he converted to atrial fibrillation. his amiodarone dose was increased per ep and he was started on a heparin infusion. decision was made for cardioversion on . the following days he remained hemodynamically stable while awaiting therapeutic ptt with heparin and he continued to be in atrial fibrillation. on , postoperative day #7, he underwent cardioversion successfully. he converted to a sinus rhythm with a prolonged pr interval. he was stable with this rhythm. he was deemed ready for discharge by both electrophysiology and cardiac surgery on postoperative day #8. he was discharged home on postoperative day #8. discharge medications: lasix 20 mg q day times one week, kcl 20 meq q d times one week, colace 100 mg , aspirin, enteric coated, 325 mg q d, amiodarone 400 mg q d for one day followed by 200 mg q d, duration to be decided by ep, percocet 1-2 tablets q 4-6 hours prn. condition on discharge: stable. fop: his primary care physician in two weeks, dr. , dr. in four weeks. , m.d. dictated by: medquist36 procedure: extracorporeal circulation auxiliary to open heart surgery other electric countershock of heart open and other replacement of mitral valve diagnoses: mitral valve disorders cardiac complications, not elsewhere classified atrial fibrillation other chronic pulmonary heart diseases other specified cardiac dysrhythmias atrioventricular block, complete surgical operation with implant of artificial internal device causing abnormal patient reaction, or later complication,without mention of misadventure at time of operation 

Answer: The patient is high likely exposed to