Document Detail


Usefulness of right-to-left shunting and poor exercise gas exchange for predicting prognosis in patients with pulmonary arterial hypertension.
MedLine Citation:
PMID:  20381675     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We hypothesized that the longitudinal changes in peak oxygen uptake, ventilatory efficiency, and exercise-induced right-to-left shunting in patients with pulmonary arterial hypertension (PAH) would predict outcomes better than baseline measurements alone. Patients with PAH die prematurely. Identifying prognostic markers is critical for treating patients with PAH; however, longitudinal prognostic information of PAH is limited. We enrolled 103 patients with PAH into a long-term, prospective outcome study using serial cardiopulmonary exercise testing to measure the peak oxygen uptake, ventilatory efficiency (ratio of ventilation to carbon dioxide output at the anaerobic threshold), right-to-left shunting, and other factors in patients treated with optimal therapy. The patients were followed up for a mean of 4.7 years. During the study period, 20 patients died, and 3 underwent lung transplantation. The baseline peak oxygen uptake and ventilatory efficiency was 0.79 L/min and 49 (normal <34), respectively, reflecting severe disease. Poorer ventilatory efficiency and greater New York Heart Association classification were associated with poor outcome at baseline and at follow-up. On multivariate analysis, the persistence or development of an exercise-induced right-to-left shunt strongly predicted death or transplantation (p <0.0001), independent of the hemodynamics and all other exercise measures, including peak oxygen uptake and ventilatory efficiency. The absence of a shunt at baseline was associated with a 20% rate of nonsurvival, which decreased to 7% at follow-up. A poorer ventilatory efficiency appeared to be associated with a poor outcome in patients without a shunt. In conclusion, a persistent exercise-induced right-to-left shunt and poor ventilatory efficiency were highly predictive of poor outcomes in patients with pulmonary arterial hypertension.
Authors:
Ronald J Oudiz; Raghu Midde; Arsen Hovenesyan; Xing-Guo Sun; Giorgio Roveran; James E Hansen; Karlman Wasserman
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of cardiology     Volume:  105     ISSN:  1879-1913     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-12     Completed Date:  2010-06-15     Revised Date:  2011-07-28    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1186-91     Citation Subset:  AIM; IM    
Copyright Information:
Copyright 2010 Elsevier Inc. All rights reserved.
Affiliation:
Department of Medicine, Division of Cardiology, Los Angeles Biomedical Research Institute, Harbor-UCLA Medical Center, Torrance, CA, USA. roudiz@labiomed.org
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MeSH Terms
Descriptor/Qualifier:
Exercise Test / methods*
Exercise Tolerance / physiology*
Female
Follow-Up Studies
Humans
Hypertension, Pulmonary / diagnosis*,  mortality,  physiopathology
Male
Middle Aged
Prognosis
Prospective Studies
Pulmonary Circulation*
Pulmonary Gas Exchange / physiology*
Pulmonary Wedge Pressure / physiology*
Severity of Illness Index
Survival Rate / trends
Time Factors
United States / epidemiology
Grant Support
ID/Acronym/Agency:
1 K23 RR17596-01/RR/NCRR NIH HHS; K23 RR017596-01/RR/NCRR NIH HHS; M01 RR000425-407583/RR/NCRR NIH HHS; M01-RR00425/RR/NCRR NIH HHS
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