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Lung volume reduction in emphysema — surgery, valves and bullectomy
In a patient with severe emphysema and hyperinflation who has completed pulmonary rehabilitation, lung volume reduction — surgically (LVRS) for upper-lobe-predominant emphysema with low exercise capacity, or with endobronchial valves when there is no collateral ventilation — improves breathing and sometimes survival; a giant bulla occupying a third or more of the hemithorax is treated by bullectomy.
Why it matters in the exam
The physiological idea is simple: a hyperinflated lung compresses normal tissue and flattens the diaphragm, so removing the most destroyed areas restores the ability of the diaphragm and chest wall to work. The NETT trial (2003) is the basis of the questions: volume reduction surgery improved survival and function in patients whose emphysema was upper-lobe-predominant and whose exercise capacity stayed low after rehabilitation. In contrast, in the "high-risk" group — FEV1 of 20% or less together with DLCO of 20% or less or homogeneous emphysema — mortality after surgery was high, so these patients are not candidates. Further conditions: smoking cessation for at least 4 months and pulmonary rehabilitation before the decision.
Endobronchial valves are a bronchoscopic alternative: a one-way valve is placed in the bronchus of the destroyed lobe, and the lobe collapses. The key condition is absence of collateral ventilation — intact fissures on CT or a Chartis measurement — because otherwise air returns through the neighbouring lobe. Typical candidates have FEV1 of 15–45% predicted and significant hyperinflation. The common complication is pneumothorax, usually in the first days, so the patient is observed in hospital. A giant bulla (occupying a third or more of the hemithorax and compressing normal lung) is treated by bullectomy, usually by VATS, and must be distinguished from pneumothorax before a drain is inserted.
Patients who do not fit either option and meet the criteria are referred for lung transplant assessment.
Key points
- Volume reduction frees the diaphragm.
- NETT: benefit in upper-lobe emphysema with low exercise capacity.
- Valves — only without collateral ventilation.
- Pneumothorax — a common complication of valves.
- Giant bulla — bullectomy.
Summary table
| Treatment | For whom | Key points |
|---|---|---|
| LVRS | Upper-lobe emphysema, low exercise capacity after rehabilitation | NETT: survival benefit in this group |
| Endobronchial valves | FEV1 of 15–45%, hyperinflation, no collateral ventilation | Common complication — pneumothorax |
| Bullectomy | Giant bulla of a third or more of the hemithorax | Exclude pneumothorax before a drain |
| Not suitable for volume reduction | FEV1 of 20% or less with DLCO of 20% or less or homogeneous emphysema | High mortality; consider transplant |
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Sources
- GOLD Global Strategy for the Diagnosis, Management and Prevention of COPD, 2025 — Interventional therapy in stable COPD
- National Emphysema Treatment Trial (NETT) Research Group, N Engl J Med, 2003 — Lung-volume-reduction surgery versus medical therapy for severe emphysema
- Shields' General Thoracic Surgery, 8th edition (2019) — Surgery for emphysema and bullous disease
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.