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: allergies: patient recorded as having no known allergies to drugs attending: addendum: pt. was seen by ep as he had a 2 second pause, and they recommended discontinuing lopressor and continuing with amiodorone. his lopressor was discontinued. discharge disposition: extended care facility: of md procedure: single internal mammary-coronary artery bypass extracorporeal circulation auxiliary to open heart surgery coronary arteriography using two catheters left heart cardiac catheterization excision or destruction of other lesion or tissue of heart, open approach (aorto)coronary bypass of one coronary artery open and other replacement of mitral valve with tissue graft diagnoses: anemia, unspecified coronary atherosclerosis of native coronary artery atrial fibrillation long-term (current) use of anticoagulants sinoatrial node dysfunction diseases of tricuspid valve personal history of colonic polyps impotence of organic origin mitral valve stenosis and aortic valve insufficiency 

Answer: The patient is high likely exposed to