Clinic notes were received indicating that the vns patient was referred for generator replacement surgery due to a depleting battery and an increase in seizures.The patient's device was tested during an office visit on (b)(6) 2015 and diagnostic results showed normal device function and battery status = ok.Since the patient's last office visit on (b)(6) 2015, the patient began having two amnestic events per month along with "zoning out" spells.The patient denied any missed dosages of medications or any illness, and the patient's last lab tests showed medication levels within normal limits.A battery life calculation using the available programming history showed approximately 2 years remaining.No known surgical interventions have occurred to date.No further information relevant to the event has been received to date.
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