[Effect COVID-19 pandemic in an emergency department in Argentina]

The objective of this study was to reveal how the COVID-19 pandemic process affected the number of visits to an emergency department of a highly complex hospital located in the Ciudad Autonoma de Buenos Aires, to explore the characteristics and reasons for consultation. The monthly number of visits between January 2019 and December 2020 was analyzed. The data showed a strong decrease in the number of visits (176 370 in 2019 and 95 421 in 2020), with an abrupt drop after the lockdown disposal (In aprilshowed the maximum reduction: 77.1%), and the different stages are reflected in the evolution (a consequence of quarantine), yielding a global annual reduction of 45.9%. The number of patients admitted by ambulances increased (5.1% in 2019 to 10.4% in 2020; p < 0.05), and consequently, the number of patients in the more complex sector (area B 2019: 5.3%, 2020: 11.5%; p < 0.01), as well as unscheduled hospitalizations from 6.8% (95% CI 6.7-6.9) to 12.1% in 2020 (95%CI11.8-12.3), p < 0.01. The five most frequent reasons for consultation in 2020 were: fever (5.1%), odynophagia (4.7%), abdominal pain (2.6%), cough (1.8%) and headache (1.8%), probably all related to COVID-19. In conclusion, the number of emergency department visits decreased by half compared to the previous year.