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AbstractIntroductionThe need to care for patients with emergency symptoms still continues during the COVID-19 pandemic. The number of emergency surgery procedures performed in Spanish hospitals decreased significantly during the first wave of COVID-19.Patients and MethodsWe performed a retrospective cohort study comparing the emergency surgery activity in a Spanish tertiary Hospital during the COVID-19 pandemic and emergency surgery activity registered in 2019 during the equivalent time period.ResultsA total of 1802 patients were included in control group (CG) versus 756 in pandemic group (PG). Mean number of patients who underwent emergency surgery during the control and pandemic periods was 3.42 patients per day, in contrast to 1.62 during the pandemic period, which represents a 52.6% decrease in emergency surgery activity. During the pandemic period, most of the patients consulted after more than 72 h of symptoms, representing a delay in presenting in the ER of 23.7% when compared to CG. Surgeries due to complications from previous elective procedures decreased (12% vs. 6.1%) in PG, probably because elective procedures are being postponed. We had a 13.1% COVID-19 positivity rate. Morbidity was higher during pandemic (52.5% vs. 35.2%). Mortality rates in patients undergoing emergency surgery was higher in PG (12.1% vs. 4.8%).ConclusionsThe impact of the first wave of COVID-19 in emergency surgery activity has been profound. A significant reduction in emergency surgery was observed, along with longer time periods between patients’ onset of symptoms and their arrival at the Emergency Department. Higher morbidity was also observed during the pandemic period.