RT Journal Article
SR Electronic
T1 Increased oxygen pulse after lung volume reduction surgery is associated with reduced dynamic hyperinflation
JF European Respiratory Journal
JO Eur Respir J
FD European Respiratory Society
SP 837
OP 843
DO 10.1183/09031936.00169311
VO 40
IS 4
A1 Matthew R. Lammi
A1 David Ciccolella
A1 Nathaniel Marchetti
A1 Malcolm Kohler
A1 Gerard J. Criner
YR 2012
UL http://erj.ersjournals.com/content/40/4/837.abstract
AB Stroke volume augmentation during exercise is limited in chronic obstructive pulmonary disease patients because of decreased preload from dynamic hyperinflation (DH). We hypothesised that oxygen pulse and pulse pressure (PP) improve following lung volume reduction surgery (LVRS), and the magnitude of improvement correlates with reduction in DH. We compared 16 emphysema patients undergoing LVRS with six emphysema patients not undergoing LVRS. Oxygen pulse and PP were calculated from maximal cardiopulmonary exercise tests at baseline and 6 months. End-expiratory lung volume (EELV)/total lung capacity (TLC) represented DH. Comparisons were made between baseline and 6 months at metabolic isotimes (per cent maximal carbon dioxide production (V′CO2,max)). At baseline, the LVRS group was older with higher forced expiratory volume in 1 s, but had similar hyperinflation to the non-LVRS group. At 6 months, oxygen pulse (50%, 75%, and 100% V′CO2,max) and PP (50% and 75% V′CO2,max) increased in the LVRS, but not in the non-LVRS group. Baseline functional residual capacity/TLC inversely correlated with resting oxygen pulse (r= -0.449, p=0.04). Decreased EELV/TLC correlated with increased oxygen pulse at 75% (r= -0.487, p=0.02) and 100% V′CO2,max (r= -0.548, p=0.008). LVRS led to increased oxygen pulse and PP during exercise at metabolic isotimes 6 months following surgery. Reductions in DH correlated with increases in oxygen pulse during exercise. Reducing lung volume may improve stroke volume response to exercise by decreasing DH.