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behavior changes

After my Non verbal son's last shunt revision in 2012 we noticed he became very vocal in making noise and repetitive sounds.  His excitability (verbal) at certain times (car rides) becomes uncontrollable.  It almost seems like he is unable to reel himself in.  We have tried everything but it just seems like he is unable to control his verbal outbursts. In the past few months he has had an increase of seizures as well.  His normal is 1 or 2 per year, now he's having 1 every month or two.  Is it possible that an area of the brain that controls behavior was or is affected during the last revision?  Is it possible when they did the revision something is pressing on a nerve that controls behavior?  A CT scan and Shunt series (X-rays) was just done last month and all seemed good as per Neurosurgen.  Could the placement of the shunt be the cause of the out of control behavior changes?  
1 Responses
15439126 tn?1444443163
The original shunt procedure's medical name?

Timing (dates) of:  initial procedure, any revisions, pronounced behaviour changes (esp. vocalizing, seizures)?
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