Monthly variations in acute coronary syndromes outcomes during the first year of the COVID-19 pandemic

Abstract

Background

Cardiovascular disease, particularly acute coronary syndromes (ACS), is the leading cause of death in the United States. Minor fluctuations in hospital admissions for different conditions, including ACS, can be seen throughout the year. This study focuses on the impact of admission month on outcomes of acute coronary syndromes during the first year of the COVID-19 pandemic.

Methods

This was a retrospective observational study of patients hospitalized with ACS from the National Inpatient Sample, during the years 2020 (n = 779,895) and 2019 (n = 935,975). We compared the monthly outcomes for every month to the outcomes for the month of January of that same year. The primary outcomes of interest were in-hospital mortality and time from admission to PCI

Results

Inpatient mortality for patients admitted with STEMI was significantly higher for admissions in the months of April, October and December of 2020 than January of that same year. For patients admitted with NSTEMI or UA, inpatient mortality was higher for admissions in April and December 2020 when compared to admissions in January 2020. Inpatient mortality for patients with STEMI, NSTEMI and UA was not different based on admission month in the year 2019.

Conclusion

The month of admission significantly affected outcomes for patients admitted with ACS during the COVID-19 pandemic, with higher inpatient mortality and longer time from admission to PCI for certain months in 2020. Further studies should investigate disparities in monthly ACS outcomes for the year 2021 and onward, now that COVID-19 infections have been steadily declining.

Keywords:

• ACS
• STEMI
• PCI
• admission month

Transparency

Declaration of financial/other relationships

The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties.

Peer reviewers on this manuscript have no relevant financial or other relationships to disclose.

Author contributions

All authors conceived and designed the study, drafted the manuscript, and critically revised the manuscript. All authors reviewed the literature, read and approved the final manuscript.

Acknowledgements

None.

Ethics statement

This study was deemed exempt by the Institutional Review Board of the University of Toledo, as it was a database that included de-identified patient information.

Additional information

Funding

This paper was not funded.