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Myocardial Injury and Outcomes Following COVID-19 Vaccination (MYOVAX Study)

Myocardial Injury and Outcomes Following COVID-19 Vaccination (MYOVAX Study)

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT04967807
Acronym
MYOVAX
Enrollment
57
Registered
2021-07-20
Start date
2021-08-05
Completion date
2026-08-05
Last updated
2026-03-27

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Myocardial Injury, Myocarditis, COVID-19 Vaccination, SARS-CoV-2, Cardiac MRI

Brief summary

The study will focus on cardiac blood and imaging biomarkers to facilitate early recognition of patients at risk for myocardial injury after COVID-19 vaccination. Ultimately, the intention is to identify patients at risk, reduce adverse events, and determine the need for longer-term follow-up in patients with myocardial injury after vaccination.

Detailed description

Coronavirus disease 2019 (COVID-19) vaccination frequently leads to minor side effects that may be more intense after the second dose, including fatigue and pain. However, there are emerging reports of more serious side effects in a minority of patients including myocarditis. Given the recent introduction of COVID-19 vaccination, there is limited understanding of: (i) prevalence and pattern of myocardial injury post vaccination, (ii) the risk factors for myocardial injury and adverse cardiac events post vaccination, and (iii) imaging and blood biomarkers for early recognition of patients at risk of adverse outcomes. This study will address the above-mentioned knowledge gaps by focusing on patients who have received at least one dose of a COVID-19 vaccine. The study will focus on cardiac blood and imaging biomarkers to facilitate early recognition of patients at risk for myocardial injury after COVID-19 vaccination. Ultimately, the intention is to identify patients at risk, reduce adverse events, and determine the need for longer-term follow-up in patients with myocardial injury after vaccination.

Interventions

DIAGNOSTIC_TESTCardiac PET/MRI

An imaging technique that combines the strengths of both MRI and PET into one comprehensive study. This technique allows for detailed myocardial tissue characterization with MRI (including assessment of myocardial edema and fibrosis) and metabolic changes (including myocardial inflammation).

DIAGNOSTIC_TESTBlood Biomarkers

Markers of cardiac damage, inflammation, circulating microRNA profiles, and COVID antibody levels will be evaluated in patients after COVID-19 vaccination.

Sponsors

University Health Network, Toronto
Lead SponsorOTHER

Study design

Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
DIAGNOSTIC
Masking
NONE

Masking description

None (Open Label)

Intervention model description

The study population will include 2 cohorts of patients post COVID-19 vaccination. Cohort A) symptomatic patients with clinical signs or symptoms suggestive of myocardial injury and Cohort B) asymptomatic patients without symptoms suggestive of myocardial injury who have had prior cardiac MRI.

Eligibility

Sex/Gender
ALL
Age
17 Years to No maximum
Healthy volunteers
Yes

Inclusion criteria

1. Age ≥ 17 years (both Cohort A and B) 2. Received at least one dose of a COVID-19 vaccine in the past 6 months (both Cohort A and B) 3. Developed new clinical signs or symptoms suggestive of myocarditis/myocardial injury within one month of COVID vaccine administration without other known cause (Cohort A, only)

Exclusion criteria

1. Contraindications to cardiac PET/MRI 2. Current history of COVID-19

Design outcomes

Primary

MeasureTime frameDescription
Prevalence of myocardial inflammation on PET/MRI6months and 12monthsThe prevalence of myocardial inflammation on PET/MRI will be compared between symptomatic and asymptomatic patients

Secondary

MeasureTime frameDescription
Major adverse cardiac events (MACE)6months and 12monthsDefined as a composite of: 1. Arrhythmias - new atrial or ventricular arrhythmia 2. Acute coronary syndrome 1. Acute myocardial infarction 2. Unstable angina requiring revascularization (PCI or CABG) 3. Heart failure hospitalization 4. Cardiovascular death
Left ventricular dysfunction6months and 12monthsDefined as Left Ventricular Ejection Fraction (LVEF) \< lower limit of normal on MRI
Myocardial edema6months and 12monthsDefined as high T2 \> upper limit of normal on MRI

Countries

Canada

Contacts

PRINCIPAL_INVESTIGATORKate Hanneman, MD

University Health Network, Toronto

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Mar 28, 2026