Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a single lead pacemaker with the lead terminating at the right ventricular apex . The patient is status - post median sternotomy , and a prosthetic mitral valve is again noted . The cardiomediastinal silhouette is unremarkable . The lungs are clear of focal opacities , pleural effusions or pneumothoraces noting that the right lung apex is obscured .
    OUTPUT:
    
Single lead pacemaker with lead terminating at right ventricular apex .