As per my research and information available, there is no additional risk of stroke due to having Long QTc interval in additiona to AF.
However there are a couple of things that are important..
- Many anti-arrhythmic medicines would be contrainidcated / used with caution in a person with AF and Long QT interval
- A patient who has already suffered a stroke and continues to have a long QT intervalis possibly at a higher risk of death (Read here)
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Regards
Dr. Gupta