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Role of inspiratory capacity on dyspnea evaluation in COPD with or without emphysematous lesions: a pilot study

Overview of attention for article published in International Journal of Chronic Obstructive Pulmonary Disease, September 2017
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17 Mendeley
Title
Role of inspiratory capacity on dyspnea evaluation in COPD with or without emphysematous lesions: a pilot study
Published in
International Journal of Chronic Obstructive Pulmonary Disease, September 2017
DOI 10.2147/copd.s142016
Pubmed ID
Authors

Liwei Cui, Xiuli Ji, Mengshuang Xie, Shuang Dou, Wei Wang, Wei Xiao

Abstract

Since forced expiratory volume in 1 second (FEV1) shows a weak correlation with patients' symptoms in COPD, some volume parameters may better reflect the change in dyspnea symptoms after treatment. In this article, we investigated the role of inspiratory capacity (IC) on dyspnea evaluation among COPD patients with or without emphysematous lesions. In this prospective study, 124 patients with stable COPD were recruited. During the baseline visit, patients performed pulmonary function tests and dyspnea evaluation using the modified Medical Research Council (mMRC) scale. Partial patients underwent quantitative computerized tomography scans under physicians' recommendations, and emphysematous changes were assessed using the emphysema index (EI; low attenuation area [LAA]% -950). These subjects were then divided into the emphysema-predominant group (LAA% -950≥9.9%) and the non-emphysema-predominant group (LAA% -950<9.9%). After treatment for ~1 month, subjects returned for reevaluation of both pulmonary function parameters and dyspnea severity. Correlation analysis between the change in IC (ΔIC) and dyspnea (ΔmMRC) was performed. Correlation analysis revealed that ΔIC was negatively correlated with ΔmMRC (correlation coefficient [cc], -0.490, P<0.001) in the total study population, which was stronger than that between ΔFEV1 and ΔmMRC (cc, -0.305, P=0.001). Patients with absolute ΔmMRC >1 were more likely to exhibit a marked increase in IC (≥300 mL) than those with absolute ΔmMRC ≤1 (74.36% versus 35.29%; odds ratio [OR], 5.317; P<0.001). In the emphysema-predominant group, only ΔIC strongly correlated with ΔmMRC (cc, -0.459, P=0.005), while ΔFEV1 did not (P>0.05). IC could serve as an effective complement to FEV1 in COPD patients undergoing dyspnea evaluation after treatment. For COPD patients with predominant emphysematous lesions, an increase in IC is particularly more suitable for explaining dyspnea relief than FEV1.

Twitter Demographics

The data shown below were collected from the profile of 1 tweeter who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 17 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 17 100%

Demographic breakdown

Readers by professional status Count As %
Student > Master 4 24%
Student > Ph. D. Student 3 18%
Student > Doctoral Student 2 12%
Student > Bachelor 1 6%
Professor 1 6%
Other 2 12%
Unknown 4 24%
Readers by discipline Count As %
Nursing and Health Professions 5 29%
Medicine and Dentistry 3 18%
Biochemistry, Genetics and Molecular Biology 1 6%
Economics, Econometrics and Finance 1 6%
Pharmacology, Toxicology and Pharmaceutical Science 1 6%
Other 0 0%
Unknown 6 35%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 03 October 2017.
All research outputs
#7,388,690
of 11,862,957 outputs
Outputs from International Journal of Chronic Obstructive Pulmonary Disease
#871
of 1,393 outputs
Outputs of similar age
#154,743
of 272,700 outputs
Outputs of similar age from International Journal of Chronic Obstructive Pulmonary Disease
#36
of 52 outputs
Altmetric has tracked 11,862,957 research outputs across all sources so far. This one is in the 23rd percentile – i.e., 23% of other outputs scored the same or lower than it.
So far Altmetric has tracked 1,393 research outputs from this source. They receive a mean Attention Score of 4.9. This one is in the 28th percentile – i.e., 28% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 272,700 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 33rd percentile – i.e., 33% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 52 others from the same source and published within six weeks on either side of this one. This one is in the 21st percentile – i.e., 21% of its contemporaries scored the same or lower than it.