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: erythromycin base attending: addendum: pt. had inappropriate pacer spikes detected on . he was evaluated by ep and has a faulty atrial lead. he needs to be seen by dr. in 4 weeks. discharge disposition: extended care facility: - md procedure: continuous invasive mechanical ventilation for 96 consecutive hours or more extracorporeal circulation auxiliary to open heart surgery insertion of endotracheal tube enteral infusion of concentrated nutritional substances percutaneous [endoscopic] gastrostomy [peg] temporary tracheostomy open and other replacement of aortic valve with tissue graft transfusion of packed cells diagnoses: pneumonia, organism unspecified pure hypercholesterolemia unspecified essential hypertension iron deficiency anemia secondary to blood loss (chronic) unspecified protein-calorie malnutrition thoracic aneurysm without mention of rupture atrial fibrillation aortic valve disorders surgical operation with implant of artificial internal device causing abnormal patient reaction, or later complication,without mention of misadventure at time of operation iatrogenic cerebrovascular infarction or hemorrhage 

Answer: The patient is high likely exposed to