Comparative outcomes of fentanyl and morphine in critically ill patients with malignancy: a retrospective cohort study utilizing MIMIC-IV.

Secondary outcomes comprised 14- and 30-day all-cause mortality and the LOS in the intensive care unit.

Logistic regression models were adopted to evaluate the association of fentanyl versus morphine with delirium; linear regression models were applied to examine the association with the LOS in the intensive care unit; Cox proportional hazards models were adopted to analyze associations with 14- and 30-day all-cause mortality.