| Sumario: | Objective: This study aimed to determine the relationship between the ARISCAT score and Prognostic Nutrition Index with the incidence of Postoperative Pulmonary Complication (PPC) in post-abdominal surgery patients in the intensive care unit (ICU). Design: This research is a study with observational analytical methodology using a retrospective cohort research design Setting: The research was conducted from 24 October to 31 November 2023 in the ICU of Dr. Wahidin Sudirohusodo Hospital Makassar, South Sulawesi. Patient and participants: Post-abdominal surgery patients treated in ICU. Interventions: None. Measurement and results: Data collected included demographic data (age, gender, and body mass index), ARISCAT score, Prognostic Nutrition Index (PNI), PPC incidence, mortality incidence, and length of stay in the ICU. The ARIS-CAT score is grouped into low, moderate, and high, while PNI is divided into normal and malnutrition PNI groups. There is a relationship between the ARISCAT score and the incidence of PPC with a Likelihood Ratio of 6.915 with a p-value <0.05. There is a relationship between PNI and the incidence of PPC with an Odds Ratio of 5.642 with a p-value <0.05. There is a difference in the incidence of PPC and mortality in the combination of ARICAT score + PNI with a p-value < 0.05. There is a difference in length of ICU stay, mechanical ventilation duration, and incidence of mortality in the sample with PPC with a p-value <0.05. Conclusions: There is a significant relationship between the ARISCAT score and the incidence of PPC as well as PNI in post-abdominal surgery patients treated in the ICU.
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