Regarding seizures of heart failure (or shock, coma and death) ... know the term "adrenal crisis" and the symptoms of one. Also know the symptoms of dehydration and know that one incident of vomiting or diarrhea may dehydrate your child (i.e. dangerous if happens before bedtime). Also, a vomiting incident can indicate "not enough salt" or "not enough cortef" is in their system (i.e. not due to an illness). There are two good adrenal crisis articles: www.emedicine.com (then search textbooks for adrenal crisis) www.healthanswers.com (search 'acute adrenal crisis') Emedicine also has a real good pediatric dehydration article that discusses the different types of dehydration.