(((HUGS))) I recently had to call 911 for my child, and it is exactly as you described, except she didn't lose consciousness...pale, eyes looking all weird, rolling around as if she wanted to go to sleep. For my daughter, it is brought on by stomach pain, because she usually feels nauseous right before it happens. I've been told it is a VASOVAGAL RESPONSE, which can be triggered by many things....emotions such as fright and also pain. Since it happened after your daughter banged her leg, this is my best guess. When she faints, it is called VASOVAGAL SYNCOPE. The vagus nerve in the body gets stimulated and affects blood pressure. Low blood pressure takes blood flow from the brain, and the fainting occurs as the body's way of getting the blood flowing back to the brain. In small children, their blood pressure is lower anyway, so they have a lower threshold, which is why she was acting very tired afterward, just like my daughter. It is extremely scary when it happens, but if she has no underlying heart condition, there isn't much you can do about it except add lots of salt to her food and keep her well hydrated at all times.
I know how scary it is, because I've been through it. It's happened to my daughter (whose almost 4) twice in 6 weeks. We'll be seeing a pediatrician soon to determine if she needs a workup. The main things you want to rule out are cardiac problems and seizures. With seizures, there is a post-ictal state, which very easily mimics vasovagal near syncope, however, while seizure activity can be easily missed sometimes, with the history you describe, I'm betting it is vasovagal in nature. It sounds like she has had lots of tests done, so just keep a vigilant eye on her. Good luck!!
My daughter does the same thing. She pinched her leg on a toilet seat in a restaurant and blacked out. All the doctors tests were normal. I'm writing this in the E.R room. Today she bumped her knee on the bleachers in the park. Passed out about 2 minutes later. She had even stopped breathing. She was given CPR and came out, but went down again. My wife said she could not open her mouth at first. Doctors think it might be a seizure. They are going to do a spinal tap to get more info. I'll post more info when I find out...
I agree with seizures.. not all seizures show up on an EEG unless they are activily having a seizure..
I have a question, did they look at her heart?
another question the first time she did this did she bump her leg prior to passing out.. the reason I am asking is my now 19 year old at times when he hit his leg (has to be a certain spot with in 3 mintues he would do the same thing and all they said was some type of response to pain.. he did it several times all of them were at school as he is a tall kid and the desks were small
I hope you can get some answers REALLY soon
Michelle
If she were my daughter, I'd check for some kind of mild seizure. They probably concentrated on her heart before, but did they do an EEG?