Utility Inspiratory Capacity by Simple Spirometry as an indirect Measure of Air Trapping
Journal Title: Archives of Pulmonology and Respiratory Care - Year 2017, Vol 3, Issue 1
Abstract
Objective: To evaluate the utility of inspiratory capacity (IC) measured by simple spirometry as an indirect measure of air trapping. Method: Functional residual capacity (FRC) and IC were determined, respectively, by a body plethysmography and by spirometry. Air trapping was defined by a FRC higher than 120%. Spearman’s rho between IC and FRC is determined and the receiver operating characteristic (ROC curve) is calculated as predictive of air trapping for IC. The best cutoff of the overall test is calculated. Results: 148 patients were included with a mean FEV1 60% (SD 20%). There was significant correlation between IC and FRC with a Spearman rho -0.673 (p <0.0001). The area under the ROC curve for IC and FRC was 0.803 (95% CI 0.709 to 0.897). The optimal cutoff for predicting air trapping was given for a forced IC less than 80% of its theoretical value, with a sensitivity of 82%, a specificity of 73%, a positive predictive value of 73% and a negative predictive value 82%. Conclusions: Inspiratory capacity is useful in the assessment of air trapping and may determine a cut below 80%.
Authors and Affiliations
Herrejon Alberto, Palop Julio, Herrera Susana, Betancurt Alejando
Keywords
Related Articles
- EP ID EP340723
- DOI 10.17352/aprc.000016
- Views 58
- Downloads 0
Genotyping and Molecular Characterization of Dermatophytes Isolates Collected from Clinical Samples
Background: Detection of dermatophytes by microbiological method is sometimes problematic and some atypical microscopic or macroscopic morphology are non-detectable. Due to morphological similarity and existing intermedi...
Utility Inspiratory Capacity by Simple Spirometry as an indirect Measure of Air Trapping
Objective: To evaluate the utility of inspiratory capacity (IC) measured by simple spirometry as an indirect measure of air trapping. Method: Functional residual capacity (FRC) and IC were determined, respectively, by a...
Chronic Obstructive Pulmonary Disease and Occupational Exposures: Epidemiological Evidence from R. Macedonia
Introduction: The research found consistent associations between workplace exposures across a wide range of sectors and the development of chronic obstructive pulmonary disease (COPD) independently of or in concert with...
Coronary Artery Bypass Surgery in Left Main Disease with Idiopathic Artery Pulmonary Hypertension. Role of PGE Therapy
Idiopathic pulmonary hypertension (PAH) is a rare disease of unknown etiology that leads to the development of severe precapillary pulmonary hypertension [1-3], characterized by impaired regulation of both pulmonary hemo...
Interventional Pulmonology in 2015: A Survey of Practice Patterns and Future Directions of this Emerging Field
Background: Interventional Pulmonology (IP) training through formal fellowship programs have become increasingly popular over the last several years. There is a dearth of data on the current practice of IP in the United...