The pathophysiology of attention deficit-hyperactivity disorder (ADHD) includes neurobiological deficits. Which of the following has been suggested as a pathologic basis for ADHD?
Decreased dopamine in the mesocortical pathway and increased dopamine in the mesolimbic pathway
Abnormalities of frontosubcortical pathways
Increased activity in the ventral tegmental area and the nucleus accumbens
Increased serotonin production in the raphe nucleus
The Correct Answer is B
Choice A reason: Alterations in dopamine pathways are involved in ADHD, but the pattern described—decreased dopamine in the mesocortical and increased in the mesolimbic—is more characteristic of schizophrenia rather than ADHD. ADHD involves overall dysregulation and reduced activity in dopaminergic circuits that modulate attention and impulse control.
Choice B reason: Abnormalities of frontosubcortical pathways represent the most consistent neurobiological finding in ADHD. The frontosubcortical circuits connect the prefrontal cortex with subcortical structures like the striatum and thalamus. Dysfunction in these regions leads to deficits in executive function, attention regulation, impulse control, and working memory. Neuroimaging studies show reduced activity and smaller volumes in these regions among individuals with ADHD, correlating with the behavioral symptoms of inattention and hyperactivity.
Choice C reason: Increased activity in the ventral tegmental area and nucleus accumbens would lead to heightened reward-seeking behavior rather than impaired attention. These regions are part of the brain’s reward system, and their increased activity is associated more with addictive behaviors and mania than ADHD.
Choice D reason: Serotonin abnormalities can influence mood and anxiety but are not primary in ADHD’s pathophysiology. ADHD primarily involves dysregulation of dopaminergic and noradrenergic transmission in frontostriatal circuits.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: The Children’s Behavior Checklist (CBCL) assesses a broad range of emotional and behavioral problems but is less specific for diagnosing ADHD, ODD, or conduct disorder.
Choice B reason: The Child Behavior Rating Scale primarily evaluates classroom behaviors and may not capture home behaviors or provide diagnostic clarity across multiple disorders.
Choice C reason: The Conners-Wells’ Adolescent Self-Report Scale is designed for adolescents and relies on self-report, making it less appropriate for a 7-year-old child.
Choice D reason: This is correct. The Conners 3-Parent Assessment Report is a validated parent-report tool designed to evaluate ADHD, ODD, and conduct disorder in children and is appropriate for use in a 7-year-old.
Correct Answer is B
Explanation
Choice A reason: Alterations in dopamine pathways are involved in ADHD, but the pattern described—decreased dopamine in the mesocortical and increased in the mesolimbic—is more characteristic of schizophrenia rather than ADHD. ADHD involves overall dysregulation and reduced activity in dopaminergic circuits that modulate attention and impulse control.
Choice B reason: Abnormalities of frontosubcortical pathways represent the most consistent neurobiological finding in ADHD. The frontosubcortical circuits connect the prefrontal cortex with subcortical structures like the striatum and thalamus. Dysfunction in these regions leads to deficits in executive function, attention regulation, impulse control, and working memory. Neuroimaging studies show reduced activity and smaller volumes in these regions among individuals with ADHD, correlating with the behavioral symptoms of inattention and hyperactivity.
Choice C reason: Increased activity in the ventral tegmental area and nucleus accumbens would lead to heightened reward-seeking behavior rather than impaired attention. These regions are part of the brain’s reward system, and their increased activity is associated more with addictive behaviors and mania than ADHD.
Choice D reason: Serotonin abnormalities can influence mood and anxiety but are not primary in ADHD’s pathophysiology. ADHD primarily involves dysregulation of dopaminergic and noradrenergic transmission in frontostriatal circuits.
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