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Syncope associated with tonic-clonic seizure-like activity occurred in six patients(40%)during the baseline tilt and in four patients(27%)during isoproterenol infusion(total positive tests,67%).The EEG showed diffuse brain wave slowing(not typical of epileptic seizures)in five of five patients during the convulsive episode.All patients who had positive test results eventually become tilt table negative after therapy,and over a mean follow-up period of 21+/-2 months,no further seizure-like episodes have occurred.Upright tilt table testing combined with isoproterenol infusion may be useful to distinguish convulsive syncope from epileptic seizures. |
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