# The Outcomes of Patients with Omicron Variant Infection who Undergo Elective Surgery: A Propensity-score-matched Case-control Study

## TL;DR

This study finds that undergoing elective surgery while infected with the Omicron variant does not significantly increase major complications.

## Contribution

The study provides evidence that Omicron infection may not necessitate postponing elective surgeries.

## Key findings

- Only renal insufficiency in the 8-14 days subgroup and anemia in the >30 days subgroup showed significant differences.
- No significant differences were found in major complications like pneumonia, sepsis, or ICU transfers.
- Omicron infection does not significantly increase overall perioperative complication risks.

## Abstract

Aim: To investigate whether it is safe for patients with Omicron variant infection to undergo surgery during perioperative period.

Methods: A total of 3,661 surgical patients were enrolled: 3,081 who were not infected with the Omicron variant and 580 who were infected with the Omicron variant. We conducted propensity score matching (PSM) with a ratio of 1:4 and a caliper value of 0.1 to match the infected and uninfected groups based on 13 variables. After PSM, we further divided the Infected group (560 cases) by the number of days between the preoperative Omicron variant infection and surgery: 0-7, 8-14, 15-30, and >30 days. Multivariate logistic regression analysis was subsequently conducted on the categorical variables and continuous variables with a P value below 0.05, thereby comparing the infected group (0-7, 8-14, 15-30, >30 days) and the uninfected group for perioperative complications.

Results: Multivariate logistic regression analysis revealed that, compared to the uninfected group, among the four subgroups of the infected patients (0-7, 8-14, 15-30, >30 days), only renal insufficiency in the 8-14 days subgroup (OR: 0.09, 95%CI 0.01-0.74, P = 0.025) and anemia in the > 30 days subgroup (OR 0.6, 95%CI 0.4-0.9, P < 0.017) showed significant difference. However, there was no statistically significant difference in the incidence rate of blood transfusion, postoperative intensive care unit transfer, lung infection/pneumonia, pleural effusion, atelectasis, respiratory failure, sepsis, postoperative deep vein thrombosis, hypoalbuminemia, urinary tract infections, and medical expenses.

Conclusion: Omicron infection does not significantly increase the risk of perioperative major complications. The Omicron infection may not be a sufficient risk factor to postpone elective surgery.