Long-Term Survival of Children Discharged From Pediatric Intensive Care: A Linked Data Cohort Study.

Objectives: The long-term survival of children discharged from PICUs and factors associated with mortality following discharge have not been systematically studied. The objective was to describe the long-term survival of children discharged alive from Australian PICUs and identify factors associated with death after discharge.

Design: A cohort data linkage study.

Setting: The Australian and New Zealand Paediatric Intensive Care Registry linked with the Australian National Death Index.

Patients: Children discharged from PICUs in Australia between 1997 and 2018.

Interventions: None.

Measurements and main results: Exposures included the time period of admission, demographic, social, and admission factors. A multivariable Cox proportional hazards model and Kaplan-Meier survival curves were used to investigate exposures associated with mortality. The records of 96,743 children were available for analysis. The risk of death reduced over time: compared with children admitted from 1997 to 2002, the hazard ratios for death after discharge for children admitted from 2003-2008, 2009-2013, to 2014-2018 were 0.92 (95% CI, 0.85-0.99), 0.69 (0.64-0.745), and 0.60 (0.55-0.65). The risk of death associated with low-risk underlying conditions, such as asthma, was 70% lower than the reference (standard risk) group, while there was a seven-fold increase in the risk of death with very-high-risk underlying conditions, such as malignancy. Residing in outer regional and very remote areas was associated with higher risk of death.

Conclusions: The survival of children discharged from Australian PICUs has improved over time; the risk of death reduced by 40% over the study period. The underlying disease, age, and residing in locations with reduced access to healthcare were associated with reduced probability of survival after discharge.