Intensive care unit length of stay: recent changes and future challenges

Area of Science:

• Critical Care Medicine
• Health Services Research
• Hospital Administration

Background:

• Hospital length of stay has decreased over time.
• The impact of this decrease on intensive care unit (ICU) length of stay is not well understood.
• Understanding ICU stay duration is crucial for resource allocation and cost management.

Purpose of the Study:

• To compare case-mix adjusted intensive care unit (ICU) length of stay for critically ill patients.
• To analyze changes in ICU stay over a 5-year interval (1988-1990 vs. 1993-1996).
• To determine if decreased overall hospital stay influenced ICU duration.

Main Methods:

• A nonrandomized cohort study design was employed.
• Data were collected from 42 ICUs in 40 US hospitals (1988-1990) and 285 ICUs in 161 US hospitals (1993-1996).
• Patient demographic and clinical characteristics were used to compare observed and predicted ICU length of stay and hospital mortality.

Main Results:

• Mean observed hospital length of stay decreased by 3 days, while mean observed ICU length of stay remained similar (4.70 vs. 4.53 days).
• After case-mix adjustment, the mean ICU stay decreased by only 0.11 days (p < .001).
• Aggregate risk-adjusted hospital mortality showed no significant difference between the two periods.

Conclusions:

• Decreased hospital length of stay pressures did not significantly influence ICU length of stay.
• ICU duration remained stable for most patient diagnoses.
• Reduction in ICU stay may be a future target for cost-containment strategies in healthcare.