<prompt> Most common cause of syncope in a child?Breath holding spellTantrum spellHypoglycemiaNeurocardiogenic  <response>: Syncope is sudden transient loss of consciousness with inability to maintain postural tone - Syncope is caused by a lack of adequate cerebral blood flow - Most common cause of syncope in the normal pediatric population is neurocardiogenic syncope, which is also known as vasovagal syncope. 