A 54 year-old male comes to the emergency room with fever, chills, weakness, chest pain and abdominal pain. He does not report shortness of breath or abdominal bloating or swelling in the legs, ankles and feet or weight loss or cough or headaches or weakness in extremities. Auscultation of lungs and heart is normal. He has no murmurs. His chest radiograph is normal but echocardiogram shows vegetations on the mitral valve. Blood cultures show predominance of streptococcus bovis bacteria. After initial endocarditis treatment, this patient should undergo which of the following evaluations?
