Background: Despite the introduction of the concept known as "Chain of Survival" has significantly increased survival rates in patients with out-of-hospital cardiac arrest (OHCA), short-term mortality in this group of patients is still very high. Epidemiological data on OHCA in Poland are limited. The aim of this study was to create a prospective registry on OHCA covering a population of 2.7 million inhabitants of Upper Silesia in Poland. Presented herein is the study design and results of a 3-month pilot study. Methods: The Silesian Registry of Out-of-Hospital Cardiac Arrest (SIL-OHCA) is a prospective, population-based registry of OHCA, of minimum duration which was planned for 12 months; from January 1 st , 2018 to December 31 st , 2018. The first 3 months of the study constituted the pilot phase. The inclusion criterion is the occurrence of OHCA in the course of activity of the Voivodeship Rescue Service in Katowice, Poland. Results: During the 3-month pilot phase of the study there were 390 cases of OHCA in which cardiopulmonary resuscitation was undertaken. Estimated frequency of OHCA in the population analyzed was 57 per 100,000 population per year. Shockable rhythm was present in 25.8% of cases. Return of spontaneous circulation was achieved in 35.1% of the whole cohort. 28.7% of patients were admitted to the hospital, including 2.8% of patients, who were admitted during an ongoing cardiopulmonary resuscitation. Conclusions: Prehospital survival of patients with OHCA in Poland is still unsatisfactory. It is believed that data collected in SIL-OHCA registry will allow identification factors, which require improvement in order to reduce short-and long-term mortality of patients with OHCA.

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Introduction: The SARS-CoV-2 virus was recognized in December 2019 in China. From that moment it has quickly spread around the whole world. It causes COVID-19 disease manifested by breathlessness, coughing and high temperature. The COVID-19 pandemic has become a great challenge for humanity. The aim: To analyze interventions of emergency medical teams during the SAR-CoV-2 pandemic, and to compare obtained data with the same periods in 2018-2019. Material and methods: The study retrospectively analyzed interventions of emergency medical teams in the period from 15.03 to 15.05 in 2018 - 2020. 1,479,530 interventions of emergency medical teams were included in the study. The number of interventions, reasons for calls, and diagnoses made by heads of the emergency medical teams during the SARS-CoV-2 pandemic were compared to the same period in 2018-2019. Results: Authors observed the decline in the number of interventions performed by emergency medical teams during the pandemic in relation to earlier years by approximately 25%. The big decline concerned interventions that were the reason for calls to public places, such as “traffic accident” and “collapse”. In the case of diagnoses made by the head of the emergency medical team, the diagnoses regarding stroke or sudden cardiac arrest remained at the similar level. Others showed a marked decline. Conclusions: Reduced social activity contributed to a reduced number of interventions by emergency medical teams in public places. The societal fear of the unknown also contributed to the decrease in the number of interventions performed by emergency medical teams. People began to avoid contact with other people.