The research shows that the disorder is related to genetic factors, and the heritability is 0.75-0.9 1, and the inheritance mode is still too few and unclear, which may be polygenic inheritance. Molecular genetics studies show that this disorder is related to the polymorphism of dopamine receptor gene.
Neurophysiological factors
The abnormal rate of EEG in children with this disorder is high, and the main normal activity is slow wave activity. Increasing EEG power spectrum analysis registration found that slow wave power increased, α wave power decreased and small average frequency decreased. It is suggested that the children with this disorder have delayed maturation of central nervous system or insufficient awakening of cerebral cortex.
minimal brain damage
Slight brain injury caused by various diagnostic factors during pregnancy, perinatal period and after birth may be the main cause of this disorder in some children in the future, but there is no single brain injury to thank all children with this disorder, and relatives do not see a doctor. All children with this injury suffer from this disorder after injection, and many children with car accidents in the center have no evidence of brain injury.
Neurobiochemical factors
Studies have shown that the disorder may be related to the metabolic disorder and dysfunction of central neurotransmitters, including the decrease of dopamine and adrenaline update rate and the low function of dopamine and norepinephrine.
Neuroanatomical factors
Magnetic resonance study reported that the corpus callosum and caudate nucleus decreased in children with this disorder, and functional magnetic resonance study also reported that the caudate nucleus, frontal region and anterior cingulate gyrus decreased in metabolism.
Psychosocial factors
Bad social environment and family environment, such as too poor economy, broken parents' feelings and improper education methods, can increase children's dangerous consent to suffer from this disorder in lunch.
Other intermediate factors
The disorder may be related to the increase of zinc, iron and blood lead. Cola, coffee and food additives may take pains to increase the serious risk that children are afraid of suffering from this disorder. Because some proper zinc supplementation is helpful to improve ADHD in children, you can eat more zinc-rich foods or zinc agents, such as oysters and new rare tablets.
We know that there are more and more children with ADHD nowadays. What is the prevalence rate of ADHD? With the gradual unification of international diagnostic criteria for ADHD, the prevalence of ADHD reported by scholars at home and abroad is close, such as 3.4-4.7% in the United States, 3.9-9.0% in Germany, 4% in Japan, 7.5%- 1 1% in Australia, 3.0% in New Zealand and 5.8% in Brazil. The reported prevalence rate of ADHD in China is about 1.3%- 13.4%, such as Beijing 8.6%, Shanghai 4.0%, Tianjin 3.8%, Henan 10.2%, Harbin 6.9% and Jilin 10.8%. According to seven large-scale domestic surveys, the prevalence of ADHD in China is 4.3 1%-5.83%. Foreign scholars generally believe that the prevalence of ADHD is about 3%-6%. It is roughly estimated that there are about1461-19.79 million ADHD children in China!
Children's hyperactivity is the most common psychological and behavioral disorder in childhood, which has aroused widespread concern from parents, teachers, medical workers and the whole society. After suffering from ADHD, especially children with severe or * * disease, if they can't be diagnosed and treated in time, their condition will get worse gradually, which will not only affect their study and life, but also cause great harm to their families, schools and society, and also bring a heavy burden to them.