FVC to slow inspiratory vital capacity ratio: a potential marker for small airways obstruction.

Abstract:

BACKGROUND:The ratio of FVC to slow inspiratory vital capacity (SVC) has been reported to reflect small airways obstruction, but its validity as such is still unclear. The aim of this study was to assess the applicability of the FVC/SVC ratio as a marker of small airways function in patients with bronchiolitis obliterans syndrome (BOS) after lung transplantation (LTX), which is a disorder in which predominantly small airways obstruction causes progressive airflow limitation. METHODS:The FVC/SVC ratio was analyzed both cross-sectionally and longitudinally in 39 patients (26 men) with BOS after bilateral LTX (median age, 47 years; interquartile range [IQR], 35 to 54 years), and 36 bilateral lung transplant recipients without BOS (14 men; median age, 46 years; IQR, 41 to 53 years). RESULTS:The FVC/SVC ratio decreased significantly during follow-up in patients with BOS stages 1 and 2, by 2.2% and 4.4%, respectively, from baseline (p < 0.001). This decrease was not significantly associated with the decrease in FEV(1). The FVC/SVC ratio increased, though not significantly, in the group in which BOS did not develop by 1.1%, which is a significant difference from the average fall of 4.4% in the group in which BOS developed. CONCLUSIONS:Significant, yet small decreases in FVC/SVC ratio occur in patients in whom BOS develops, independent from changes in FEV(1). At a group level, FVC/SVC ratio is able to detect small airways changes. These results merit prospective studies to determine the sensitivity of FVC/SVC ratio to quantifying small airways dysfunction at an individual level and in other airway diseases.

journal_name

Chest

journal_title

Chest

authors

Cohen J,Postma DS,Vink-Klooster K,van der Bij W,Verschuuren E,Ten Hacken NH,Koëter GH,Douma WR

doi

10.1378/chest.06-2763

subject

Has Abstract

pub_date

2007-10-01 00:00:00

pages

1198-203

issue

4

eissn

0012-3692

issn

1931-3543

pii

S0012-3692(15)36713-1

journal_volume

132

pub_type

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