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Lung function after bilateral lower lobe lung volume reduction surgery for alpha1-antitrypsin emphysema

AF Gelb, RJ McKenna, M Brenner, R Fischel, N Zamel
European Respiratory Journal 1999 14: 928-933; DOI:
AF Gelb
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RJ McKenna
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M Brenner
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R Fischel
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N Zamel
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Abstract

This study explores the mechanism(s) of airflow limitation following lung volume reduction surgery (LVRS) in patients with emphysema due to homozygous alpha1-antitrypsin (AT) deficiency. Bilateral targeted lower lobe stapled LVRS using video thoracoscopy was performed in six patients (five males) aged 61+/-9 yrs (mean+/-SD) with alpha1-AT emphysema. Two patients received only a 6-month follow-up. However, four patients, at 22, 24, 27 and 36 months post-LVRS, noted relief from dyspnoea and increased walk tolerance. At 27+/-6 months (mean+/-SD) post-LVRS, their forced expiratory volume in one second improved only from 30+/-2% of the predicted value (mean+/-SEM) before surgery to 33+/-1% pred after surgery. Yet, total lung capacity (TLC) decreased from 151+/-13 to 127+/-10% pred; diffusing capacity increased from 35+/-9 to 59+/-9% pred; and vital capacity increased from 68+/-10 to 88+/-5% pred. In three patients, static lung elastic recoil at TLC increased from 1.1+/-0.15 to 1.2+/-0.10 kPa. Using flow/pressure curves, the mechanism for expiratory airflow limitation pre-LVRS and the improvement noted post-LVRS could be primarily accounted for by the initial loss and subsequent increase in lung elastic recoil. Bilateral lung volume reduction surgery provides modest physiologic improvement for 2-3 yrs in patients with alpha1-antitrypsin emphysema due to increases in lung elastic recoil.

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Lung function after bilateral lower lobe lung volume reduction surgery for alpha1-antitrypsin emphysema
AF Gelb, RJ McKenna, M Brenner, R Fischel, N Zamel
European Respiratory Journal Oct 1999, 14 (4) 928-933;

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Lung function after bilateral lower lobe lung volume reduction surgery for alpha1-antitrypsin emphysema
AF Gelb, RJ McKenna, M Brenner, R Fischel, N Zamel
European Respiratory Journal Oct 1999, 14 (4) 928-933;
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