O22 Risk of death following pulmonary complications of surgery with and without SARS-CoV-2 infection: a comparative analysis of pre-pandemic and pandemic cohort studies

Introduction: No comparison has been made between the risk of death following pulmonary complications in patients with and without SARS-CoV-2 infection. This study aimed to determine the incidence and impact of pulmonary complications before and during the SARSCoV- 2 pandemic Method: A patient-level comparative analysis of two international prospective cohort studies;conducted pre-pandemic (22 January to 19 October 2019) and during the SARS-CoV-2 pandemic (local emergence of COVID-19 up to 19 April 2020). Patients undergoing elective resection of an intra-abdominal cancer with curative intent across five surgical oncology disciplines were included in analysis. The primary outcome measure was the mortality within 30 days of surgery Result: This study included 7402 patients from 50 countries;3031 (40.9%) were operated pre-pandemic and 4371 (59.1%) during the pandemic 5.1% (n=224/4371) of patients during the pandemic developed a postoperative SARS-CoV-2 infection. Despite selection of lower risk cases during the pandemic, the rates of pulmonary complications pre were similar (6.3% vs 6.9%, P=0.280). However, the risk of death after surgery was higher during the pandemic (2.0% vs 0.7%, P<0.001). The population attributable fraction of deaths due to pulmonary complications was 37.7% (95% CI: 15.2-64.7%) pre-pandemic and 66.0% (95% CI: 48.6-79.3%) during the pandemic. The increased mortality was largely attributable to SARS-CoV-2 infection;68.9% (n=31/45) of deaths patients with pulmonary complications occurred following SARS-CoV- 2 infection Conclusion: Pulmonary complications are the primary driver of death after elective surgery during the pandemic. Care providers must urgently reconfigure surgical services to protect patients from perioperative SARS-CoV-2 infection Take-home Message: Pulmonary complications are the primary driver of death after elective surgery during the pandemic. Care providers must urgently reconfigure surgical services to protect patients from perioperative SARS-CoV-2 infection .