Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a dual - chamber pacemaker with leads projecting over the expected locations of the right atrium and right ventricle . Valve replacement hardware and sternotomy wires are again noted . There is persistent elevation of the right hemidiaphragm with minimal right basilar atelectasis . No focal consolidation , pleural effusion , or pneumothorax is detected . Aortic calcification is again noted .
    OUTPUT:
    
Dual - chamber pacemaker with leads projecting over the expected locations of the right atrium and right ventricle .