For Patient B — smoking is the principal cause of COPD. Which description of its two components is correct?

Correct answer: B. Chronic bronchitis is a CLINICAL diagnosis (productive cough on most days for 3 months in each of 2 consecutive years); emphysema is a PATHOLOGICAL diagnosis (permanent enlargement and destruction of airspaces distal to the terminal bronchiole)

• A. COPD obstruction is by definition INCOMPLETELY REVERSIBLE, and that is exactly what distinguishes it from asthma.
• B. CORRECT. Both definitions are worth carrying verbatim. CHRONIC BRONCHITIS is defined CLINICALLY — a productive cough on most days for at least three months in each of two consecutive years. Its phenotype is the ‘blue bloater’: overweight and cyanotic, with peripheral oedema, wheeze and an elevated haemoglobin from chronic hypoxaemia. EMPHYSEMA is defined PATHOLOGICALLY — permanent enlargement of the airspaces distal to the terminal bronchiole with destruction of their walls. Its phenotype is the ‘pink puffer’: older and thin, severely dyspnoeic, with a quiet chest and a hyperinflated film showing flattened diaphragms. Most real patients have elements of both.
• C. This reverses the two definitions.
• D. Post-bronchodilator spirometry showing an FEV1/FVC ratio below 0.70 CONFIRMS airflow obstruction and grades its severity, but it does not define either component.

Note: The oral and dental consequences of smoking to list alongside COPD: nicotinic stomatitis, smoker's melanosis, oral squamous cell carcinoma, accelerated periodontal breakdown with a BLUNTED bleeding response that masks disease severity, delayed healing and dry socket, implant failure, staining and halitosis. For treatment: short appointments, an upright chair position, caution with rubber dam if it worsens dyspnoea, avoid nitrous oxide in severe disease, and remember that in a CO₂ retainer high-flow oxygen is not automatically benign.