Assessment of a multifactorial risk index for predicting postoperative pneumonia after open abdominal aortic aneurysm...

Area of Science:

• Vascular Surgery
• Critical Care Medicine
• Surgical Outcomes Research

Background:

• Pneumonia is a significant postoperative complication, particularly following major surgeries like open abdominal aortic aneurysm (AAA) repair, carrying a high mortality rate.
• The existing Post-operative Pneumonia Risk Index (PPRI) has been validated in general surgical populations but requires assessment in the specific context of open AAA repair.

Purpose of the Study:

• To validate the Post-operative Pneumonia Risk Index (PPRI) in patients undergoing elective open abdominal aortic aneurysm (AAA) repair.
• To identify independent predictors of postoperative pneumonia in this patient cohort.

Main Methods:

• The PPRI was applied retrospectively to patients undergoing elective open AAA repair at a tertiary referral vascular unit.
• Statistical analyses, including Receiver Operating Characteristic (ROC) curve analysis and multivariate analysis, were used to evaluate the PPRI's performance and identify significant predictors.

Main Results:

• Pneumonia occurred in 20% of the studied patients undergoing open AAA repair.
• An optimal PPRI cutoff of 36 was identified by ROC analysis, yielding a likelihood ratio of 1.35 for pneumonia.
• Multivariate analysis revealed that only weight loss exceeding 10% in the preceding 6 months independently predicted postoperative pneumonia.

Conclusions:

• The PPRI has limited value in predicting postoperative pneumonia in patients undergoing open AAA repair.
• Significant preoperative weight loss (>10%) appears to be a strong independent predictor of pneumonia in this population.
• Targeted preventive strategies focusing on patients with substantial weight loss may be beneficial for reducing pneumonia risk after AAA repair.