Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP semi-erect chest radiograph ___ at 08 :21 is submitted .
    OUTPUT:
    
Right internal jugular Swan - Ganz catheter now has its tip in the right pulmonary artery . Right subclavian PICC line unchanged in position . Dual lead left - sided pacer unchanged in position . Status post median sternotomy with aortic valve replacement and stable postoperative cardiac and mediastinal contours . Bilateral layering pleural effusions with stable bibasilar airspace opacities suggestive of compressive atelectasis , although pneumonia can not be excluded . Low lung volumes with crowding of pulmonary vasculature and no overt pulmonary edema . Pulmonary venous hypertension .