Which statement describes the significance of chest X-ray findings in COPD?

• A. It reveals hyperinflation of alveoli and a flattened diaphragm in late stages
• B. It always shows enlarged heart
• C. It shows no abnormal findings
• D. It is the gold standard diagnostic test

Answer: (A)

In COPD, chest X-ray findings mainly reflect air trapping and the loss of elastic recoil in the lungs. The most characteristic change is hyperinflation, which makes the lungs appear overexpanded and causes the diaphragms to flatten, especially as the disease advances and emphysematous destruction becomes more prominent. This radiographic pattern supports the diagnosis in the right clinical context and helps rule out other conditions that can mimic COPD, such as pneumonia, heart failure, or pneumothorax. However, it is not the definitive test for COPD—spirometry showing airflow limitation with an abnormal FEV1/FVC ratio after bronchodilator is the gold standard for diagnosis and assessment. Heart size on X-ray is not a reliable feature of COPD and can be normal or variable depending on comorbid conditions. Some patients, particularly in early disease, may have a largely normal radiograph, but late-stage COPD often shows clear evidence of hyperinflation and diaphragmatic flattening.