Unexplained blackouts without warning

[Swannie12853]

My 19 yo daughter has had unexplained blackouts for several years. In total there have been 5. The last one happened when she was driving and caused an accident. There is now a lot of attention to it. She has seen 2 cardiologists, and 3 neurologists. She has had EKG which possibly showed a borderline elongated QT interval. They did a procedure where they ran wires up a vein in her leg to her heart. The doctor said that if he had found a cause he could have ablated it. Nothing was of found. All other tests have been normal. Tilt table, cat scan, and other test to detect seizures. She has endometriosis, is prone o migraines, she has a severe latex allergy, asthma, and fibromyalgia. Can any one help us? Tis is ruining her life.

[Swannie12853]

Thanks I will ask. She did have a cat scan. Would it have shown up on a cat scan.

[akalo]

I would consider asking the neurologist to order an MRI.
When you mentioned blackouts and migraines I thought maybe could be a small hemangioma or meningioma.  The smaller tumors (usually benign) can be present for years before they are detected by a MRI but still produce neurologic disturbances, there's just absolutely no extra space in the cranium for anything else except brain.
Be on the watch for any changes or deviation from her normal symptoms which could indicate growth of a tumor.
I had a MRI in 2008 which appeared normal and another in 2012 which showed a tumor.  The neurologist said he could faintly make the tumor out on the 2004 MRI since the 2012 MRI tipped him off on where to look.  So even if it's normal it may be a good idea to go ahead and get one.  Good luck!