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Long QT Syndrome causing fainting
Much more likely: an arrhythmia caused the fall. If a diagnosis of Long QT Syndrome is confirmed, it can be complicated by conditiosns called torsade, ventricular tachycardia or even 'sudden cardiac death'. All of these could reduce the bloodflow to your son's brain dramatically, thus cause fainting or worse - hence a fall!
At this point a diagnosis of Long QTc (QT intervals, corrected for heart rate (QTc) that are longer than 440 mseconds) has not been confirmed. I suggest a consultation with a pediatric cardiologist as the next step. Whether small size plays a role I can't tell. Long QT Syndrome can run in the family, so it may be important to find out whether this is the case.
Hope this helps,
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