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Attention-deficit hyperactivity disorder in children
1Department of Paediatrics, Northern General Hospital, Sheffield, UK.
Insights
New classifications refine attention-deficit hyperactivity disorder (ADHD) definitions, distinguishing inattentiveness from hyperactivity. While causes remain unclear, psychostimulant therapy shows short-term behavioral benefits but uncertain long-term outcomes.
Area of Science:
- Neuroscience
- Psychiatry
- Developmental Psychology
Background:
- Attention-deficit hyperactivity disorder (ADHD) classifications have evolved with ICD-10 and DSM-IV.
- These revisions enhance diagnostic concordance and differentiate between inattentive and hyperactive presentations.
- Understanding ADHD heterogeneity is crucial for effective management.
Purpose of the Study:
- To summarize the redefined diagnostic criteria for ADHD.
- To explore potential causes and contributing factors.
- To examine treatment outcomes, particularly for psychostimulant therapy.
Main Methods:
- Review of diagnostic criteria from ICD-10 and DSM-IV.
- Analysis of research on ADHD etiology, excluding common myths.
- Evaluation of studies on psychostimulant treatment efficacy.
Main Results:
- ADHD definitions are more aligned, emphasizing inattentive vs. hyperactive traits.
- Dietary factors (sugar, aspartame) and thyroid issues are unlikely primary causes.
- Subgroups with comorbidities (psychological disorders, tics, intellectual disability) exhibit distinct characteristics.
- Psychostimulants effectively manage short-term behaviors but have less proven long-term psychosocial or academic benefits.
Conclusions:
- ADHD is a heterogeneous disorder with varied origins and prognoses.
- Current diagnostic updates improve clarity but causal factors require further investigation.
- Long-term efficacy of psychostimulant treatment for ADHD warrants continued research.
Abstract:
Attention-deficit hyperactivity disorder has been redefined in the classifications in the International Classification of Disease, 10th revision and Diagnostic and Statistical Manual of Mental Disorders, fourth edition. The definitions are more concordant than their predecessors and reemphasize the distinction between inattentiveness and hyperactivity. The causes and mechanisms are still uncertain, but dietary sugar or aspartame and thyroid dysfunction do not seem to be major factors. Specific subgroups, such as children with comorbid psychologic disorders, tic disorders, or mental handicap, seem to have different origins, natural history, prognoses, and responses to treatment, reflecting the heterogeneous nature of the disorder. Psychostimulant therapy has unquestioned short-term effects on behavior but less certain benefits on long-term psychosocial outcome or on academic performance.