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Is pulmonary vascular resistance index predictive of exercise tolerance in adult patients with idiopathic pulmonary arterial hypertension.
MedLine Citation:
PMID:  22820321     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Clinical trials for adults with pulmonary arterial hypertension use exercise capacity, as measured by walking distance, as the primary endpoint to measure symptomatic improvement. In this article, we look at the relationship between walking distance and a hemodynamic variable, pulmonary vascular resistance index (PVRI), from the available trials. METHODS: Patient-level data from 16 randomized controlled clinical trials were obtained. All idiopathic subjects with a baseline and study endpoint measurement of both hemodynamic and exercise endpoints were included. Changes from baseline in both endpoints and the relationship between the endpoints were summarized. Receiver operating characteristic curves were used to investigate the predictive ability. Measures of surrogacy were also calculated. RESULTS: There is a weak correlation between changes in PVRI and exercise capacity. Receiver operating characteristic analysis shows a high false positive rate of using one variable to predict the other. Measures of surrogacy show the proportion of variability in exercise capacity explained by PVRI is approximately 5%. CONCLUSIONS: PVRI should not be used as a surrogate marker to predict changes in exercise capacity.
Authors:
John P Lawrence; Jim Hung; Sue Jane Wang
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-19
Journal Detail:
Title:  Contemporary clinical trials     Volume:  -     ISSN:  1559-2030     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101242342     Medline TA:  Contemp Clin Trials     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
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