[From inattentive-type attention deficit hyperactivity disorder to the restrictive type]

Area of Science:

• Neurodevelopmental disorders
• Childhood psychiatric conditions

Context:

• Attention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental disorder in children, affecting 3-6% of the school-age population.
• ADHD presents heterogeneous neurobiological characteristics, with distinct frontostriatal and frontoparietal circuit involvement observed in combined and inattentive subtypes, respectively.

Purpose:

• To review the characteristics of patients with the inattentive subtype of ADHD.
• To explore the potential for a more homogenous subtype classification within the inattentive presentation.
• To examine the proposed restrictive subtype in DSM-5 for improved ADHD classification.

Summary:

• The current diagnostic criteria (DSM-IV-TR) present challenges in classifying ADHD presentations without significant hyperactivity.
• The DSM-5 aims to reformulate ADHD subtypes, introducing a 'restrictive ADHD' category for individuals meeting specific inattention and minimal hyperactivity-impulsivity criteria.
• This proposed subgroup is characterized by distinct neurobiological underpinnings, particularly involving the frontoparietal circuit.

Impact:

• The definition of the restrictive ADHD subgroup could enhance the detection of patients who have been historically under-recognized in clinical and research settings.
• Improved classification may lead to more targeted research and tailored clinical interventions for specific ADHD presentations.