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Division of 1 Pulmonary and Critical Care Medicine and 2 Thoracic Surgery, Brigham and Women's Hospital, and 3 Department of Anesthesia and Critical Care, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02115
This paper examines potential
physiological mechanisms responsible for improvement after lung volume
reduction surgery (LVRS). In 25 patients (63 ± 9 yr; 11 men, 14 women), spirometry [forced expiratory volume in 1 s
(FEV1) and forced vital capacity (FVC)], lung volumes
[residual volume (RV) and total lung capacity (TLC)], small airway
resistance, recoil pressures, and respiratory muscle contractility
(RMC) were measured before and 4-6 mo after LVRS. Data were
interpreted to assess how changes in each component of lung mechanics
affect overall function. Among responders (
FEV1
12%; 150 ml), improvement was primarily due to an increase in FVC, not
to FEV1-to-FVC ratio. Among nonresponders,
FEV1, FVC, and RV/TLC did not change after surgery,
although recoil pressure increased in both groups. Both groups
experienced a reduction in RMC after LVRS. In conclusion, LVRS improves
function in emphysema by resizing the lung relative to the chest wall
by reducing RV. LVRS does not change airway resistance but decreases
RMC, which attenuates the potential benefits of LVRS that are generated
by reducing RV/TLC. Among nonresponders, recoil pressure increased out
of proportion to reduced volume, such that no increase in vital
capacity or improvement in FEV1 occurred.
lung volume reduction; emphysema; lung mechanics; lung volumes
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