Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are relatively hyperinflated , suggesting chronic obstructive pulmonary disease . The patient is status post median sternotomy and cardiac valve replacements . No focal consolidation is seen . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
No acute cardiopulmonary process .