Utilization and Outcomes in U.S. ICU Hospitalizations

Area of Science:

• Critical Care Medicine
• Health Services Research
• Epidemiology

Background:

• Detailed national estimates of intensive care unit (ICU) utilization and patient outcomes are limited.
• Understanding trends in ICU care is crucial for healthcare resource allocation and quality improvement.

Purpose of the Study:

• To characterize national trends in ICU utilization and associated outcomes over a 12-year period (2008-2019) in the United States.
• To analyze changes in length of stay, mortality, and readmission rates for ICU versus non-ICU hospitalizations.

Main Methods:

• A longitudinal study analyzing 100% Medicare Part A claims and commercial claims data for adult populations.
• Inclusion of over 18 million ICU hospitalizations and 78 million non-ICU hospitalizations in Medicare beneficiaries.
• Inclusion of nearly 2 million ICU hospitalizations and over 16 million non-ICU hospitalizations in commercially insured adults.

Main Results:

• ICU care was utilized in approximately 20% of Medicare and 10% of commercial hospitalizations between 2008 and 2019.
• A decrease in average length of stay and ICU length of stay was observed for ICU hospitalizations.
• Mortality and hospital readmissions declined for both ICU and non-ICU hospitalizations, with greater reductions in ICU cases.

Conclusions:

• ICU utilization remains significant, with declining length of stay and mortality observed over the study period.
• There was a notable increase in shorter ICU hospitalizations (2-7 days), often involving younger patients and common diagnoses.
• Findings highlight opportunities to optimize ICU resource allocation and enhance the value of critical care for patients and payers.