Concerning attention deficit hyperactivity disorder which is true?
**Core Concept**
Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by symptoms of inattention, hyperactivity, and impulsivity. The pathophysiology of ADHD involves abnormalities in the dopamine and norepinephrine systems, particularly in the prefrontal cortex and basal ganglia.
**Why the Correct Answer is Right**
The correct answer is related to the genetic component of ADHD. Research has shown that ADHD has a strong genetic component, with heritability estimates ranging from 70-90%. Certain genetic variants, such as the dopamine transporter gene (DAT1) and the dopamine receptor D4 gene (DRD4), have been associated with an increased risk of developing ADHD.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because ADHD is not primarily caused by environmental factors, although environmental factors can contribute to the development of ADHD in susceptible individuals.
* **Option B:** This option is incorrect because ADHD is not solely a disorder of childhood, although symptoms often persist into adulthood.
* **Option C:** This option is incorrect because ADHD is not primarily a disorder of executive function, although executive function deficits are common in individuals with ADHD.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that ADHD is a heterogeneous disorder, and individual symptoms and severity can vary widely. A comprehensive diagnostic evaluation should include a thorough medical and psychiatric history, as well as a clinical examination and rating scales, such as the Conners Adult ADHD Rating Scales (CAARS).
**Correct Answer: D. ADHD has a strong genetic component, with heritability estimates ranging from 70-90%.**