Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a dual - chamber pacemaker with the leads terminating in the right atrium and right ventricle . There is stable postoperative widening of the cardiomediastinal contours compared to the recent radiographs . There appears to be a small right - sided pleural effusion and moderate to large left - sided effusion with superimposed atelectasis . There is also stable patchy atelectasis in the right lung base . The heart size is stable .
    OUTPUT:
    
Appropriate placement of the dual chamber pacemaker leads terminating in the right atrium and right ventricle .