Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , there has been interval placement of a left pectoral pacemaker with transvenous leads seen in the right atrium , right ventricle , and a left coronary vein . The lungs are clear . Mild to moderate bibasilar atelectasis is noted . No pneumothorax . The median sternotomy wires are intact and aligned . Patient is status post aortic valve and mitral valve repair .
    OUTPUT:
    
Left pectoral pacemaker with transvenous leads in the RA , RV , and a left coronary vein . No pneumothorax .