Vasovagal syncope (VVS) occurs due to cerebral hypoperfusion from a fall in blood pressure, with accompanying bradycardia in most cases. Seizure and/or asystole may accompany VVS, though their prediction within the VVS cohort remains elusive. To further characterize VVS and to find predictive features of "complex" VVS (defined as VVS associated with seizures and/or asystole).
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