A 65-Year-Old Man with a History of Coronary Artery Disease

A 65-year-old man with a history of coronary artery disease comes to the physician complaining of progressive exertional shortness of breath, fatigue, and lower extremity swelling.  His medical history is significant for a myocardial infarction 5 years ago and an electronic pacemaker implanted 2 years ago.  His chest x-ray is shown below.  A segment of one of the leads is highlighted (arrow) . The highlighted segment most likely lies within which of the following structures?

A) Anterior interventricular sulcus
B) Atrioventricular groove
C) Pulmonary artery
D) Right atrium
E) Right ventricle

Correct Answer:

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