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If she is having tongue bite then this looks like a seizure more than a syncope. I am not sure whether she had a Routine EEG (study of the brain waves) done or not. If not done she needs a Routine EEG asap because Routine EEG can help in telling us whether these episodes are seizures or not. If she already had a Routine EEG then she would require a Prolonged monitoring EEG like Ambulatory EEG for 72 hours etc which can help in establishing the correct diagnosis.
Serious possibilities like brain tumors etc are unlikely because she had a normal CAT scan of the brain. However because the CAT scan has come normal she now needs an MRI scan of the brain. MRI scan can identify conditions which might have been missed by a CAT scan so an MRI scan of the brain is recommended along with the EEG. However please not to worry about serious possibilities or life threatening conditions like brain tumors etc because such serious possibilities can be diagnosed with the CAT scan itself and her CAT scan being normal such serious possibilities appear unlikely. She will also need a test called as Tilt Table Test to explore the possibility of Syncope. If the syncope diagnosis is confirmed then the neurologist has to consider starting her on syncope treatments which may include trying her on meds like SSRI agents or Beta Blockers etc. If the seizure diagnosis is confirmed then the neurologist has to consider starting her on seizure meds to prevent these type of episodes happening in the future.
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