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CHRONIC OBSTRUCTIVE PULMONARY DISEASE |
1 West Park Healthcare Centre, University Health Network, University of Toronto, Toronto, Ontario, Canada
2 Lung Volume Reduction Surgery Clinic, University Health Network, University of Toronto, Toronto
3 McMaster University Health Sciences Centre, Hamilton, Ontario, Canada
4 Hopital Laval, Sainte-Foy, Quebec, Canada
Correspondence to:
Correspondence to:
Dr R S Goldstein, West Park Healthcare Centre, 82 Buttonwood Avenue, Toronto, Ontario, Canada M6M 2J5;
rgoldstein{at}westpark.org
Background: The clinical value of LVRS has been questioned in the absence of trials comparing it with pulmonary rehabilitation, the prevailing standard of care in COPD. Patients with heterogeneous emphysema are more likely to benefit from volume reduction than those with homogeneous disease. Disease specific quality of life is a responsive interpretable outcome that enables health professionals to identify the magnitude of the effect of an intervention across several domains.
Methods: Non-smoking patients aged <75 years with severe COPD (FEV1 <40% predicted, FEV1/FVC <0.7), hyperinflation, and evidence of heterogeneity were randomised to surgical or control groups after pulmonary rehabilitation and monitored at 3 month intervals for 12 months with no crossover between the groups. The primary outcome was disease specific quality of life as measured by the Chronic Respiratory Questionnaire (CRQ). Treatment failure was defined as death or functional decline (fall of 1 unit in any two domains of the CRQ). Secondary outcomes included pulmonary function and exercise capacity.
Results: LVRS resulted in significant between group differences in each domain of the CRQ at 12 months (change of 0.5 represents a small but important difference): dyspnoea 1.9 (95% confidence interval (CI) 1.3 to 2.6; p<0.0001); emotional function 1.5 (95% CI 0.9 to 2.1; p<0.0001); fatigue 2.0 (95% CI 1.4 to 2.6; p<0.0001); mastery 1.8 (95% CI 1.2 to 2.5; p<0.0001). In the control group one of 27 patients died and 16 experienced functional decline over 12 months. In the surgical group four of 28 patients died and three experienced functional decline (hazard ratio = 3.1 (95% CI 1.3 to 7.6; p=0.01). Between group improvements (p<0.05) in lung volumes, flow rates, and exercise were sustained at 12 months (RV -47% predicted (95% CI -71 to -23; p=0.0002); FEV1 0.3 l (95% CI 0.1 to 0. 5; p=0.0003); submaximal exercise 7.3 min (95% CI 3.9 to 10.8; p<0.0001); 6 minute walk 66 metres (95% CI 32 to 101; p=0.0002).
Conclusions: In COPD patients with heterogeneous emphysema, LVRS resulted in important benefits in disease specific quality of life compared with medical management, which were sustained at 12 months after treatment.
Keywords: lung volume reduction surgery; chronic obstructive pulmonary disease; quality of life
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