Exposure to mRNA COVID-19 vaccines was associated with a lower incidence of pericarditis and myocarditis (5 per 100,000) compared to unvaccinated individuals (70 per 100,000).
Cohort
No
Does mRNA COVID-19 vaccination affect the incidence of pericarditis or myocarditis compared to unvaccinated individuals?
mRNA COVID-19 vaccination is associated with a significantly lower overall incidence of pericarditis and myocarditis compared to being unvaccinated, although it is the most frequent cause of these conditions in adolescents.
Absolute Event Rate: 5% vs 70%
OBJECTIVE: This study compared the incidence of pericarditis and myocarditis in patients exposed to mRNA COVID-19 vaccines to the incidence in those who were not vaccinated, considering the incidence of these conditions resulting from COVID-19 infection. METHODS: This was a retrospective cohort study of individuals assigned to health area of La Paz University Hospital in Spain. The exposure factor was vaccination with mRNA COVID-19 vaccines between December 27th, 2020 and January 9th, 2022 with a minimum follow-up of one month. The outcome was the incidence of pericarditis or myocarditis in these individuals. RESULTS: The incidence of pericarditis and myocarditis in the total population exposed to at least one dose of mRNA COVID-19 vaccines was 5/100,000 (CI95%:3 to 8 per 100,000), compared to 70/100,000 (CI95%: 66 to 92 per 100,000) in those who were not vaccinated. In the adolescent population (aged 12-17), the incidence was 10/100,000 in vaccinated population (CI95%: 5 to 45 per 100,000) compared to 20/100,000 in unvaccinated (CI95%: 6 to 79 per 100,000). The incidence of pericarditis or myocarditis in patients with COVID-19 infection was 200/100,000 people (CI95%: 114 to 306 per 100,000). The most common cause of pericarditis and myocarditis in the cohort was idiopathic/infectious (74 cases). Cases of myocarditis attributed to COVID-19 infection were more severe and had higher mortality rates compared to cases with other causes. CONCLUSION: The incidence of pericarditis and myocarditis in patients exposed to mRNA COVID-19 vaccines was lower than in those who were not vaccinated, especially in adults.The most common cause of pericarditis and myocarditis was idiopathic/infectious, but the most frequent cause in adolescent patients was mRNA COVID-19 vaccination. Cases of myocarditis due to COVID-19 infection were more severe and had greater mortality.
Urroz et al. (Mon,) conducted a cohort in Pericarditis and myocarditis. mRNA COVID-19 vaccines vs. unvaccinated individuals was evaluated on incidence of pericarditis or myocarditis. Exposure to mRNA COVID-19 vaccines was associated with a lower incidence of pericarditis and myocarditis (5 per 100,000) compared to unvaccinated individuals (70 per 100,000).