Intensive Care Admissions and Outcome of Cardiac Arrests; A National Cohort Study From the United States

Objective: Outcomes of cardiac arrest among patients who had cardiopulmonary resuscitation (CPR) in intensive care units (ICU) has limited data on the national level basis in the United States. We aimed to study the outcomes of ICU CPRs. Methods: Data from the national readmissions database (NRD) sample that constitutes 49.1% of the stratified sample of all hospitals in the United States were analyzed for ICU-related hospitalizations for the years 2016 to 2019. ICU CPR was defined by procedure codes. Results: A total of 4,610,154 ICU encounters were reported for the years 2016 to 2019 in the NRD. Of these patients, 426,729 (9.26%) had CPR procedure recorded during the hospital encounter (mean age 65 +/- 17.81; female 42.4%). And 167,597 (39.29%) patients had CPR on the day of admission, of which 63.16% died; while 64,752 (15.18%) patients had CPR on the day of ICU admission, of which 72.85% died. And 36,002 (8.44%) had CPR among patients with length of stay 2 days, of which 73.34% died. A total of 1,222,799 (26.5%) admitted to ICU died, and patients who had ICU CPR had higher mortality, 291,391(68.3%). Higher complication rates were observed among ICU CPR patients, especially who died. Over the years from 2016 to 2019, ICU CPR rates increased from 8.18% (2016) to 8.66% (2019); p-trend= 0.001. The mortality rates among patients admitted to ICU increased from 22.1% (2016) to 24.1% (2019); p-trend= 0.005. Conclusion: The majority of ICU CPRs were done on the first day of ICU admission. The trend for ICU CPR was increasing. The mortality trend for overall ICU admissions has increased, which is concerning and would suggest further research to improve the high mortality rates in the CPR group.