Impact of different waves of COVID-19 on emergency medical services and out-of-hospital cardiopulmonary arrest in Madrid, Spain / 世界急诊医学杂志（英文）

@#Out-of-hospital cardiac arrest (OHCA) is one of the three leading causes of death in industrialized countries.[1,2]Some studies have described the impact of the first COVID-19 pandemic wave in terms of the number of cases and OHCA survival rates in various regions,[3-5] but few have addressed the relationship between the successive phases and how they affected OHCA.[6,7] The 14-d cumulative incidence peaked at more than 990 cases, with these rates remaining above 200 for an eight-month period between 15 March 2020 and 15 March 2021 in Madrid, Spain.