My little sister is undiagnosed

[RandomKansas]

My 15 y/o sister has episodes where she passes out just randomly.  This has been ongoing for almost two years and has gotten much worse lately.  She now passes out, will start to breathe rapidly, then go into small seizures, and sometimes stop breathing for a short period of time all while unconscious.  In the past she would come out of just passing out after about 1 to 10 minutes she now will be out from 1 hour to 4.5 hours.  She has had many tests done that have shown nothing, Her and my mother are currently at Childrens Mercy, MO awaiting more tests, they just released her Tuesday and Wednesday afternoon she was taken there again unconscious.  They keep releasing her with no diagnoses and no information on how to deal with it.  Does anyone know what this could be?  

[DrNoopurMD]

Hi,

It is definitely a difficult case to diagnose.
It seems to be a type of seizures with prolonged unconsciousness. Loss of consciousness differentiates a simple partial seizure from a complex partial seizure.
A complex partial seizure is characterized by a loss of consciousness.
What were the results of EEG?

[RandomKansas]

Every test has come back normal, In the beginning she wasn't showing any signs of seizure. She was diagnosed neurocardiogenic syncope but doctors have recently ruled that out. Her hearbeat speeds up before some episodes, but not all of them.  She is not overly active and does drink lots of water. Sometimes she can prevent them when she does feel her heart speeding up, but not all of them.  Thank you so much for your help.

[RandomKansas]

Sorry I didn't include she has high blood pressure but was removed from all of her medication and is now only taking abilify for ADD.  Within the last hour she passed out again at the hospital, the doctors laid her on her stomach instead of her back this time and her breathing remained normal, she seized very little and came out of it within 7 minutes.