Vasovagal syncope in children requiring pacemaker implantation.

Four children presented with episodic loss of consciousness. Two of the children were siblings. Neurologic causes were initially suspected in all but extensive evaluations and EEGs excluded seizures. ECGs in one patient demonstrated first- and second-degree AV block and first-degree AV block in another. The QT and QTc intervals were normal in all. Eyeball pressure in all patients produced profound bradycardia. All patients became asymptomatic after the implantation of pacemakers, although one died 15 months afterward from another cause.