Heart failure & cardiomyopathiesCohort study
Prognostic value of QRS duration in acute myocarditis: insights from a multicentre cohort study
- multicentre cohort study
- eight tertiary centres in South Korea
- Retrospective Observational
Authors' conclusion
Prolonged QRS duration, a readily available electrocardiogram (ECG) marker, was independently associated with adverse outcomes in acute myocarditis. Serial ECG monitoring may provide a simple and practical tool for early risk stratification and management, including patients with fulminant myocarditis.
Study context
- Population
- Patients diagnosed with acute myocarditis between 2001 and 2023 at tertiary centres in South Koreapatients diagnosed with acute myocarditis
- Participants
- 925 patients
- Exposure
- QRS duration >120 ms group compared to both the QRS 100-120 and <100 ms groups
- QRS >120 msn = 250
- QRS 100-120 msn = 212
- QRS <100 msn = 463
- Outcome
- Composite of:
- All-cause mortality
- Ventricular assist device implantation
- Heart transplantation
- Follow-up
- During the (median 37.2 months)
Main finding
As reported in the abstract
Hazard ratio
1.101 per 10 ms increase
95% CI 1.049–1.156
P < 0.001
QRS duration (per 10 ms increase)
HR 1.101 per 10 ms increase (95% CI 1.049–1.156); P < 0.001
Per 10 ms increase, as printed
Observational data: associations, not effects.
Original publication
Prognostic value of QRS duration in acute myocarditis: insights from a multicentre cohort study. Eur Heart J Acute Cardiovasc Care. Published 6 April 2026. doi:10.1093/ehjacc/zuag050
Summarised from the published abstract; every number is checked against it