Objective
Substantial variability exists in the timing of limitations in life support for critically ill patients. Our objective was to investigate how the timing of limitations in life support varies with changes in organ failure status and time since acute lung injury (ALI) onset.
Design, Setting, and Patients
This evaluation was performed as part of a prospective cohort study evaluating 490 consecutive ALI patients recruited from 11 intensive care units (ICUs) at three teaching hospitals in Baltimore, MD.
Interventions
None.
Measurements
The primary exposure was proportion of days without improvement in Sequential Organ Failure Assessment (SOFA) score, evaluated as a daily time-varying exposure. The outcome of interest was a documented limitation in life support defined as any of the following: (1) No CPR, (2) Do not re-intubate, (3) No vasopressors, (4) No hemodialysis, (5) Do not escalate care or (6) Other limitation (e.g., “comfort care only”).
Main Results
For medical ICU (MICU) patients without improvement in daily SOFA score, the rate of limitation in life support tripled in the first three days after ALI onset, increased again after Day 5, and peaked at Day 19. Compared to MICU patients, surgical ICU (SICU) patients had a rate of limitations that was significantly lower during the first five days after ALI onset. In all patients, more days without improvement in SOFA scores was associated with limitations in life support, independent of the absolute magnitude of the SOFA score.
Conclusions
Persistent organ failure is associated with an increase in the rate of limitations in life support independent of the absolute magnitude of SOFA score, and this association strengthens during the first weeks of treatment. During the first five days after ALI onset limitations were significantly more common in MICUs than SICUs.