Do-not-resuscitate status and observational comparative effectiveness research in patients with septic shock*

Crit Care Med. 2014 Sep;42(9):2042-7. doi: 10.1097/CCM.0000000000000403.

Abstract

Objectives: To assess the importance of including do-not-resuscitate status in critical care observational comparative effectiveness research.

Design: Retrospective analysis.

Setting: All California hospitals participating in the 2007 California State Inpatient Database, which provides do-not-resuscitate status within the first 24 hours of admission.

Patients: Septic shock present at admission.

Interventions: None.

Measurements and main results: We investigated the association of early do-not-resuscitate status with in-hospital mortality among patients with septic shock. We also examined the strength of confounding of do-not-resuscitate status on the association between activated protein C therapy and mortality, an association with conflicting results between observational and randomized studies. We identified 24,408 patients with septic shock; 19.6% had a do-not-resuscitate order. Compared with patients without a do-not-resuscitate order, those with a do-not-resuscitate order were significantly more likely to be older (75 ± 14 vs 67 ± 16 yr) and white (62% vs 53%), with more acute organ failures (1.44 ± 1.15 vs 1.38 ± 1.15), but fewer inpatient interventions (1.0 ± 1.0 vs 1.4 ± 1.1). Adding do-not-resuscitate status to a model with 47 covariates improved mortality discrimination (c-statistic, 0.73-0.76; p < 0.001). Addition of do-not-resuscitate status to a multivariable model assessing the association between activated protein C and mortality resulted in a 9% shift in the activated protein C effect estimate toward the null (odds ratio from 0.78 [95% CI, 0.62-0.99], p = 0.04, to 0.85 [0.67-1.08], p = 0.18).

Conclusions: Among patients with septic shock, do-not-resuscitate status acts as a strong confounder that may inform past discrepancies between observational and randomized studies of activated protein C. Inclusion of early do-not-resuscitate status into more administrative databases may improve observational comparative effectiveness methodology.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Age Factors
  • Aged
  • Aged, 80 and over
  • California
  • Comparative Effectiveness Research*
  • Continental Population Groups
  • Female
  • Fibrinolytic Agents / administration & dosage
  • Health Status Indicators
  • Hospital Mortality
  • Humans
  • Intensive Care Units / organization & administration
  • Intensive Care Units / statistics & numerical data*
  • Male
  • Middle Aged
  • Protein C / administration & dosage
  • Resuscitation Orders*
  • Retrospective Studies
  • Shock, Septic / mortality*
  • Shock, Septic / therapy

Substances

  • Fibrinolytic Agents
  • Protein C