CASUS and APACHE II score in predicting mortality after coronary artery bypass grafting

Area of Science:

• Cardiology
• Critical Care Medicine
• Surgical Outcomes Research

Background:

• Predicting mortality in cardiac surgery patients is crucial for clinical decision-making.
• Established scoring systems like APACHE II have limitations in specific surgical populations.
• Isolated coronary artery bypass grafting (CABG) patients require tailored risk stratification tools.

Purpose of the Study:

• To compare the predictive accuracy of the Cardiac Surgery Score (CASUS) and the Acute Physiology and Chronic Health Evaluation (APACHE II) scoring systems.
• To evaluate the performance of CASUS and APACHE II in predicting mortality and morbidity following isolated CABG surgery.

Main Methods:

• A cohort of 204 patients undergoing isolated CABG was studied.
• CASUS and APACHE II scores were calculated based on the first 24 hours of postoperative data.
• Clinical outcomes including 7-day and 30-day mortality, reintubation, ICU readmission, and length of stay were assessed.

Main Results:

• CASUS scores were significantly higher in patients who experienced 30-day mortality (p=0.030) and required reintubation (p=0.003).
• Receiver operating characteristic (ROC) curve analysis showed a higher area under the curve (AUC) for CASUS compared to APACHE II in predicting 7-day mortality (0.90 vs. 0.72).
• CASUS also demonstrated superior predictive ability for prolonged intensive care unit stay (AUC 0.82 vs. 0.76).

Conclusions:

• The CASUS scoring system appears to be a more reliable predictor of mortality and morbidity in patients undergoing isolated CABG than the APACHE II system.
• CASUS may offer improved risk stratification for this specific surgical population.
• Further validation of CASUS in larger, diverse cohorts is warranted.