Exercise-induced ECG changes in Brugada syndrome.
Ahmad S Amin1, Elisabeth A A de Groot, Jan M Ruijter
1Heart Failure Research Center and Department of Cardiology, Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands.
Circulation. Arrhythmia and Electrophysiology
|October 22, 2009
Summary
Exercise worsens the ECG patterns in Brugada syndrome (BrS), particularly in patients with SCN5A mutations. These findings highlight the impact of exercise on BrS ECG phenotypes and SCN5A mutation effects.
Area of Science:
- Cardiology
- Genetics
- Electrophysiology
Background:
- Brugada syndrome (BrS) is associated with ventricular arrhythmias during exercise.
- SCN5A mutations are implicated in reduced sodium current at fast heart rates in BrS.
- The impact of exercise on the BrS electrocardiogram (ECG) phenotype remains understudied.
Purpose of the Study:
- To evaluate ECG responses to exercise in individuals with Brugada syndrome.
- To determine if SCN5A mutations influence these exercise-induced ECG changes.
Main Methods:
- ECG analysis of 35 controls, 25 BrS patients without SCN5A mutations, and 25 BrS patients with SCN5A mutations.
- ECGs recorded at baseline, peak exercise, and recovery.
- Comparison of ECG parameters including heart rate, QRS duration, QT interval, and J-point amplitude across groups.
Main Results:
- Exercise prolonged the corrected QT interval (QTc) in both BrS groups, unlike controls.
- QRS widening was more pronounced in BrS patients with SCN5A mutations during exercise.
- Exercise induced a coved-type ECG pattern in BrS patients, irrespective of SCN5A mutation status.
Conclusions:
- Exercise exacerbates the ECG phenotype in Brugada syndrome.
- SCN5A mutations are linked to increased conduction slowing at higher heart rates during exercise.
- The study provides insights into the mechanisms underlying exercise-induced ECG changes in BrS.
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