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Giant emphysematous bulla — SCE Respiratory MCQ

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HardLung Volume ReductionGiant emphysematous bullaSCE Respiratory

A 60-year-old man with smoking-related COPD remains markedly breathless despite smoking cessation, optimised triple inhaled therapy and completion of pulmonary rehabilitation. His post-bronchodilator FEV1 is 27% predicted, residual volume 225% predicted and TLCO 42% predicted. Arterial blood gases on air show PaO2 8.5 kPa and PaCO2 5.4 kPa. Echocardiography shows no pulmonary hypertension, and he has no major comorbidity or frailty. Unenhanced CT demonstrates a single thin-walled left upper-zone bulla occupying 38% of the left hemithorax. It compresses relatively preserved, perfused left lower-lobe parenchyma. Background emphysema is moderate, without another discrete relatively avascular target region. Quantitative fissure analysis shows an incomplete left oblique fissure, and Chartis assessment confirms interlobar collateral ventilation. Which recommendation is most appropriate?

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Reveal the answer and explanation

Correct answer: A — Refer for thoracic surgical assessment for bullectomy

Explanation lettering: D = shown as A · E = shown as D · A = shown as E

The dominant anatomical abnormality is a giant bulla occupying more than one third of a hemithorax, with compression of relatively preserved adjacent lung. NICE specifically recommends referral for bullectomy assessment when a person with COPD is breathless and CT shows a bulla occupying at least one third of the hemithorax. Bullectomy differs from conventional lung volume reduction surgery because it removes a large non-functioning air space to permit re-expansion of compressed lung. A is inappropriate because successful lobar valve treatment depends on exclusion of interlobar collateral ventilation; both the incomplete fissure and positive Chartis assessment predict failure to achieve lobar atelectasis. B is a plausible near-miss given the upper-zone location and hyperinflation, but conventional lung volume reduction surgery targets diffusely emphysematous, poorly functioning parenchyma rather than a dominant giant bulla. C does not supersede the anatomically appropriate surgical assessment; NICE restricts coils to clinical trials after lung volume reduction multidisciplinary review. E may become relevant if advanced disease progresses or no suitable volume-reducing procedure exists, but transplantation is not the priority while a potentially correctable giant bulla is compressing relatively preserved lung. The severity of airflow obstruction should prompt expert operative risk assessment rather than negate the indicated referral.

Reference: Chronic obstructive pulmonary disease in over 16s: diagnosis and management — Recommendations (Published 5 December 2018; last updated 26 July 2019) — https://www.nice.org.uk/guidance/ng115/chapter/Recommendations Evidence review G: Referral criteria for lung volume reduction procedures, bullectomy or lung transplantation (December 2018) — https://www.nice.org.uk/guidance/ng115/evidence/g-referral-criteria-for-lung-volume-reduction-procedures-bullectomy-or-lung-transplantation-pdf-6602768756