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(Chest. 1997;112:916-923.)
© 1997 American College of Chest Physicians

Dyspnea Response Following Bilateral Thoracoscopic Staple Lung Volume Reduction Surgery

Matthew Brenner MD, FCCP1; Robert J. McKenna MD2; Arthur F. Gelb MD, FCCP3; Richard J. Fischel MD, PhD4; Ben Yoong BS; Joe Huh MD; Kathy Osann PhD; and John C. Chen MD5

1 From the Division of Pulmonary Medicine, UC Irvine Medical Center, Orange, Calif
2 From the Chapman Lung Center, Orange, Calif, and UCLA Medical Center, Los Angeles
3 From the Lakewood Regional Medical Center, Lakewood, Calif, and UCLA Medical Center, Los Angeles
4 From the Chapman Lung Center, Orange, Calif
5 From the Division of Beckman Laser Institute and Cardiothoracic Surgery, UC Irvine Medical Center, Orange, Calif

Purpose: Lung volume reduction surgery (LVRS) has shown promise for treating patients with severe emphysema in recent clinical trials. However, response following surgery is difficult to assess due to frequent discrepancies between subjective and objective outcomes. We evaluated the relationship between improvement in dyspnea and pulmonary function response in 145 consecutive patients with inhomogeneous emphysema enrolled in a bilateral thoracoscopic lung volume reduction protocol in order to assess predictors of improved dyspnea outcome and correlation of subjective and objective improvement measures.

Materials and methods: Baseline complete pulmonary function testing, spirometry, gas exchange, plethysmography, gas dilution lung volumes, along with resting dyspnea index determinations were performed preoperatively, and repeated short term (mean, 33 days; n=129) and long term (>6 months; mean, 276 days; n=84) following surgery.

Results: Improvement in FEV1 percent predicted was significantly associated with improvement in dyspnea scores, though considerable variability exists (r=0.04, p<0.01, short term; r=0.4, p=0.1, long term). In this preselected patient group, those with the extreme degrees of hyperinflation may have less improvement in dyspnea following LVRS than those with milder preoperative hyperinflation. Greater improvement in dyspnea short term and long term was seen in patients with lower presenting residual volume/total lung capacity ratios (r=0.4, p=0.02, short term; r=0.4, p<0.05, long term).

Conclusions: Bilateral thoracoscopic staple LVRS results in significant objective and subjective improvement in patients with severe emphysema and hyperinflation. There was considerable variability between improvement in dyspnea and improvement in spirometry, and preoperative predictors of response may differ between these outcome variables. Further studies are needed to define the long-term implications of these findings.

Key Words: dyspnea • lung • LVRS • outcome • reduction • volume

Submitted on January 29, 1997
Accepted on June 16, 2007




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