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benign familial neonatal seizures
Benign familial neonatal seizures (BFNS), formerly called benign familial neonatal convulsions (BFNC), is a rare autosomal dominant inherited form of seizures. It manifests in newborns, normally within the first 7 days of life, as tonic-clonic seizures. Infants are otherwise normal between attacks and develop without incident. Attacks normally spontaneously cease within the first 15 weeks of life. Lifetime susceptibility to seizures is increased, as 16% of those diagnosed with BFNE earlier in life will go on to have seizures versus a 2% lifetime risk for the general population. There are three known genetic causes of BFNE, two being the voltage-gated potassium channels KCNQ2 (BFNC1) and KCNQ3 (BFNC2) and the third being a chromosomal inversion (BFNC3). There is no obvious correlation between most of the known mutations and clinical variability seen in BFNE.
==Signs and symptoms==
The only sign of BFNE are seizures, generally tonic-clonic, which occur within the first week of life. Seizures often begin as apnea, cyanosis, and hypertonia and last less than 1 minute.
People with BFNE are not more likely to develop epileptic seizures later in life.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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