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: hospital course: the patient was admitted on and was subsequently operated on for mitral valve replacement on . her past medical history included mitral regurgitation. postoperatively, the patient developed sinus ventricular tachycardia. the electrophysiology service was consulted. apparently, the electrophysiology consultant did not think that the arrhythmic rhythm was significant and attributed it to the past myocardial infarction. they recommended continuing on medication and will follow up the patient with holter monitoring in one month. condition on discharge: upon discharge, the patient's condition was stable. physical examination on discharge: the wounds were clean with no drainage and no pus. the incisions were intact. the pacing wires were discontinued on . the chest was clear to auscultation with some rales bilaterally at the bilateral lung bases. the heart was in regular rhythm. discharge medications: lopressor 25 mg p.o. b.i.d. lasix 40 mg p.o. q.d. aspirin 81 mg p.o. q.d. captopril 12.5 mg p.o. t.i.d. lipitor 10 mg p.o. q.d. potassium chloride. ibuprofen. percocet for pain control. disposition: the patient will be discharged home to follow up with dr. in three to 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 aortic valve with tissue graft diagnoses: pure hypercholesterolemia mitral valve disorders congestive heart failure, unspecified cardiac complications, not elsewhere classified paroxysmal ventricular tachycardia ventricular fibrillation 

Answer: The patient is high likely exposed to