Increased intra-QRS fragmentation in magnetocardiography as a predictor of arrhythmic events and mortality in patients with cardiac dysfunction after myocardial infarction
Open accessAbstract
Introduction: Increased intra‐QRS fragmentation score (FRA) in magnetocardiography (MCG) has shown association with sustained ventricular arrhythmias in post‐MI patients suggesting its relation to arrhythmia substrate. The aim of this study was to investigate whether increased FRA in MCG predicts arrhythmic events and mortality after acute myocardial infarction (MI) with cardiac dysfunction. Methods and Results: A series of 158 patients with acute MI and left ventricular ejection fraction (LVEF) <50% were studied. Their age was 60 ± 10 years and LVEF 40 ± 6%. MCG was registered and FRA was computed. For comparison, QRS duration in 12‐lead ECG was measured. In a mean follow‐up of 50 ± 15 months, 32 (20%) patients died and 18 (11%) had an arrhythmic event. Both arrhythmic event rate and all‐cause mortality were significantly higher in patients with increased FRA (P < 0.001 for both). In contrast, increased QRS duration in ECG predicted all‐cause mortality (P < 0.05) but not arrhythmic events. In multivariate analysis, FRA was an independent predictor of both arrhythmic events and all‐cause mortality. Using a combined criterion of increased FRA and LVEF < 30% yielded positive and negative predictive accuracies of 50% and 91% for arrhythmic events. Conclusion: In post‐MI patients with left ventricular dysfunction, increased intra‐QRS fragmentation in high‐resolution magnetocardiography predicts arrhythmic events, whereas QRS duration in 12‐lead ECG predicts all‐cause mortality. Analysis of intra‐QRS fragmentation by MCG may assist in guiding therapy of post‐MI patients, for example, by selecting those who would benefit most from prophylactic implantable cardioverter‐defibrillator therapy.
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- Authors
- KORHONEN, P., HUSA, T., TIERALA, I., VÄÄNÄNEN, H., MÄKIJÄRVI, M., KATILA, T., & TOIVONEN, L.
- Affiliations
- Helsinki University Hospital (FI)
- Corresponding author
- KORHONEN, PETRI
- Venue
- Journal of Cardiovascular Electrophysiology
- Publisher
- Wiley
- Published
- 2005-11-29
- Volume
- 17
- Issue
- 4
- Pages
- 396-401
- ISSN
- 1045-3873 (ISSN-L)
- 1540-8167
- OpenAlex
- W2083743713
- Cited by
- 51
- References
- 31
- Citations by year
- 2025: 3 · 2024: 4 · 2023: 3 · 2022: 3 · 2020: 1 · 2019: 1 · 2017: 2 · 2016: 4 · 2015: 3 · 2014: 1 · 2013: 3 · 2012: 3
- FWCI
- 1.59
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Cardiovascular Electrophysiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Acute Myocardial Infarction Research
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac pacing and defibrillation studies
- Keywords
- magnetocardiography, acute myocardial infarction, left ventricular dysfunction, ventricular arrhythmias, all-cause mortality, QRS duration, implantable cardioverter-defibrillator, arrhythmia prediction, left ventricular ejection fraction
- MeSH terms
- Arrhythmias, Cardiac, Electrocardiography, Follow-Up Studies, Heart Rate, Humans, Magnetics, Middle Aged, Myocardial Infarction, Prognosis, Prospective Studies, Risk Factors, Stroke Volume, Time Factors, Survival Rate, Ventricular Dysfunction
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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