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Arterial blood gas derangement and level of comorbidity are not predictors of long-term mortality of COPD patients treated with mechanical ventilation

Published online by Cambridge University Press:  01 July 2008

S. Christensen ,
L. Rasmussen ,
E. Horváth-Puhó ,
P. Lenler-Petersen ,
M. Rhode  and
S. P. Johnsen
S. Christensen*
Affiliation:
Aarhus University Hospital, Department of Clinical Epidemiology, Aarhus C, Silkeborg, Denmark Silkeborg Hospital, Department of Anesthesiology and Intensive Care, Silkeborg, Denmark
L. Rasmussen
Affiliation:
Aarhus University Hospital, Department of Clinical Epidemiology, Aarhus C, Silkeborg, Denmark Silkeborg Hospital, Department of Anesthesiology and Intensive Care, Silkeborg, Denmark
E. Horváth-Puhó
Affiliation:
Aarhus University Hospital, Department of Clinical Epidemiology, Aarhus C, Silkeborg, Denmark
P. Lenler-Petersen
Affiliation:
Silkeborg Hospital, Department of Anesthesiology and Intensive Care, Silkeborg, Denmark
M. Rhode
Affiliation:
Aarhus University Hospital, Department of Clinical Epidemiology, Aarhus C, Silkeborg, Denmark Silkeborg Hospital, Department of Anesthesiology and Intensive Care, Silkeborg, Denmark
S. P. Johnsen
Affiliation:
Aarhus University Hospital, Department of Clinical Epidemiology, Aarhus C, Silkeborg, Denmark
*
Correspondence to: Steffen Christensen, Department of Clinical Epidemiology, Aarhus University Hospital, Ole Worms Alle 1150, 8000 Aarhus C, Denmark. E-mail: sc@dce.au.dk; Tel: +45 8942 4820; Fax: +45 8942 4801
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Summary

Background and objective

Limited and inconsistent data exist on simple, readily available predictors of long-term mortality of critically ill chronic obstructive pulmonary disease patients requiring invasive mechanical ventilation. We therefore examined the influence of arterial blood gas derangement and burden of comorbidities on 90-day and 1-yr mortality of chronic obstructive pulmonary disease patients treated with invasive mechanical ventilation.

Methods

We identified all chronic obstructive pulmonary disease patients (n = 230) treated with invasive mechanical ventilation between 1994 and 2004 at a Danish primary-level hospital. Data on arterial blood gas specimens and comorbidity were obtained from medical records and Hospital Discharge Registries. We used Cox’s regression analysis to estimate mortality ratios according to arterial blood gas values and level of comorbidity.

Results

Ninety-day and 1-yr mortality among chronic obstructive pulmonary disease patients requiring invasive mechanical ventilation was 30.8% and 40.5%, respectively. All 90-day and 1-yr mortality ratios according to arterial blood gas values were close to one and one was included in all 95% CI. Among patients with a high level of comorbidity 90-day mortality ratio was 1.3 (95% CI: 0.6–2.7) when compared with patients without comorbidity. The corresponding 1-yr mortality ratio was 1.4 (95% CI: 0.7–2.9).

Conclusion

Chronic obstructive pulmonary disease patients treated with invasive mechanical ventilation have substantial long-term mortality. Neither the levels of arterial blood gas values measured immediately before invasive mechanical ventilation was initiated nor the burden of comorbidity were strong determinants of long-term mortality among these patients.

Keywords

CHRONIC OBSTRUCTIVE PULMONARY DISEASEMORTALITYCRITICAL CAREMECHANICAL VENTILATION
Type
Original Article
Information
European Journal of Anaesthesiology , Volume 25 , Issue 7 , July 2008 , pp. 550 - 556
Copyright
Copyright © European Society of Anaesthesiology 2008

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