[Changes of the alpha competitive structure after administration of single dose methylphenidate in different subtypes
1Institute of Mental Health,Peking University, Beijing 100083, China.
Objective:
To investigate methylphenidate response to different subtypes of attention deficit hyperactivity disorder (ADHD) boys by measuring the changes of the alpha competitive structure after administration of single dose of methylphenidate,explore the neuropathological mechanism and search for the sensitive index to predict methylphenidate response in this disorder.
Methods:
The study involved 88 ADHD boys (40 ADHD-C boys,48 ADHD-I boys) who met the DSM-IV diagnostic criteria of ADHD, and their continuous Electroencephalogram(EEG) data collected before and 2 hours after taking methylphenidate (10 mg) were analyzed with EEG-encephaloflutuographic technology ( EEG-ET).
Results:
After taking methylphenidate, (1) The main frequency of alpha band obviously increased in ADHD-C boys and ADHD-I boys(from 9.05+/-0.96 Hz up to 9.72+/-0.99 Hz,P=0.000;from 8.90+/- 0.93 Hz up to 9.25+/-0.86 Hz, P=0.002; separately) , especially in ADHD-C boy group (Z=-2.111, P=0.035). (2) The dominant probability of 8 Hz was significantly decreased in ADHD-C boys and ADHD-I boys (from 24.34%+/-12.70% down to 20.74%+/-12.46%,P=0.002;from 28.82%+/-12.51% down to 25.64%+/-12.176% ,P=0.003; separately). There was no significant difference in the changes of the dominant probability of 8 Hz between the two ADHD groups(Z=-0.494, P= 0.621).(3)The entropy value was significantly decreased in ADHD-I boys group(from 0.74+/-0.10 down to 0.70+/-0.13,t =3.579, P=0.001). There was no significant difference in the changes of the entropy value between the two ADHD groups(Z=-1.131 P=0.258).
Conclusion:
After administration of single dose of methylphenidate, slow alpha wave decreased in ADHD boys , especially in ADHD-C boy group; Single dose of methylphenidate can ameliorate the brain self-organization of ADHD-I boys . These findings suggest that the main frequency of alpha band may be the sensitive index to predict methylphenidate response in ADHD.
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