Value of arterial blood gas analysis in patients with acute dyspnea: an observational study.

Abstract:

INTRODUCTION:The diagnostic and prognostic value of arterial blood gas analysis (ABGA) parameters in unselected patients presenting with acute dyspnea to the Emergency Department (ED) is largely unknown. METHODS:We performed a post-hoc analysis of two different prospective studies to investigate the diagnostic and prognostic value of ABGA parameters in patients presenting to the ED with acute dyspnea. RESULTS:We enrolled 530 patients (median age 74 years). ABGA parameters were neither useful to distinguish between patients with pulmonary disorders and other causes of dyspnea nor to identify specific disorders responsible for dyspnea. Only in patients with hyperventilation from anxiety disorder, the diagnostic accuracy of pH and hypoxemia rendered valuable with an area under the receiver operating characteristics curve (AUC) of 0.86. Patients in the lowest pH tertile more often required admission to intensive care unit (28% vs 12% in the first tertile, P < 0.001) and had higher in-hospital (14% vs 5%, P = 0.003) and 30-day mortality (17% vs 7%, P = 0.002). Cumulative mortality rate was higher in the first (37%), than in the second (28%), and the third tertile (23%, P = 0.005) during 12 months follow-up. pH at presentation was an independent predictor of 12-month mortality in multivariable Cox proportional hazard analysis both for patients with pulmonary (P = 0.043) and non-pulmonary disorders (P = 0.038). CONCLUSIONS:ABGA parameters provide limited diagnostic value in patients with acute dyspnea, but pH is an independent predictor of 12 months mortality.

journal_name

Crit Care

authors

Burri E,Potocki M,Drexler B,Schuetz P,Mebazaa A,Ahlfeld U,Balmelli C,Heinisch C,Noveanu M,Breidthardt T,Schaub N,Reichlin T,Mueller C

doi

10.1186/cc10268

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

R145

issue

3

eissn

1364-8535

issn

1466-609X

pii

cc10268

journal_volume

15

pub_type

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