Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting semi-upright position . Comparison is made with the next preceding similar study of the prior day . During the examination interval , the patient has received a permanent pacer capsule now seen in left anterior axillary position being connected to two intravascular electrodes terminating in right atrial appendage and right ventricular apical portion position . The heart size is unchanged and remains within normal limits . The metallic structure of an aortic valve prosthesis is seen in place as before . Pulmonary vasculature is not congested , there are no new acute infiltrates and no pneumothorax is identified on either side .
    OUTPUT:
    
Status post sternotomy and aortic valve replacement , newly implanted permanent pacer , unremarkable position of electrode termination and no pneumothorax .