Magnetic Dispersion of the Late Repolarization in Brugada Syndrome
Key result
Magnetocardiography identifies late repolarization non-dipole patterns in ~90% of Brugada syndrome patients vs RBBB.
- P=0.001
- n=65
Why the study?
Magnetocardiography (MCG) was used to evaluate cardiac depolarization and repolarization abnormalities in patients with Brugada syndrome (BS).
Does magnetocardiography (MCG) differentiate Brugada syndrome from right bundle branch block and normal patients?
Population
10 BS, 21 RBBB, and 34 normal patients
Comparison
BS vs RBBB vs normal patients
Design
Cross-sectional study
Authors
Discussion
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Member takes
Implication
May aid Brugada syndrome evaluation; leaves open diagnostic role pending prospective studies.
Study Design
Type
Cross-Sectional (n=65)
Blinding
Single-blind
Multicenter
No
Structured PICO
Does magnetocardiography (MCG) differentiate Brugada syndrome from right bundle branch block and normal patients?
P
Population
65 participants, including 10 with Brugada syndrome, 21 with right bundle branch block, and 34 normal controls, underwent 64-channel magnetocardiography to evaluate depolarization and repolarization abnormalities.
E
Exposure
Magnetocardiography (MCG)
C
Comparator
Right bundle branch block (RBBB) and normal patients
O
Outcome
MCG findings during depolarization and late repolarization (horizontal spatiotemporal activation graph location, maximum current angle of the r' wave, and magnetic dispersion)surrogate
Main Result
Absolute Event Rate: 90% vs 19%
p-value: p=0.001
Magnetocardiography can identify distinct depolarization and repolarization abnormalities that differentiate Brugada syndrome from right bundle branch block and normal patients.
Limitations
- Limited number of Brugada syndrome patients.
- MCG and 12-lead ECG were not recorded simultaneously, allowing for potential transient changes.
- Lack of a provocation test before and after MCG recording.
- Need for further studies on BS patients with minimal clinical manifestations.
Cite This Study
Joung et al. (2007) conducted a cross-sectional in Brugada syndrome (n=65). Brugada syndrome vs. Right bundle branch block and normal patients was evaluated on Presence of a non-dipole pattern in the magnetic field map during late repolarization (Te-40 ms) (p=0.001). Magnetocardiography demonstrated that Brugada syndrome patients had a significantly higher frequency of non-dipole patterns during late repolarization (90%) compared to right bundle branch block (19%) and normal patients.