Clinical Scenario:
A 9-year-old boy is brought with declining school performance. His teacher reports that he is easily distracted, leaves his seat frequently, talks excessively and rarely completes tasks. His parents report similar behavior at home.
On further questioning, his mother says that he snores loudly almost every night, sleeps with his mouth open and wakes frequently during sleep. During the day, he is often tired and irritable.
What is the most appropriate next step?
A. Start methylphenidate
B. Assess for sleep-disordered breathing
C. Diagnose ADHD
D. Assess IQ
E. Start antidepressants
Correct answer & Explanation:
Correct answer: B. Assess for sleep-disordered breathing
Explanation
This child should not be diagnosed with ADHD at this stage.
Although he has several behaviors that resemble ADHD—inattention, hyperactivity and poor task completion—the history of habitual loud snoring, mouth breathing, frequent night waking and daytime tiredness strongly suggests sleep-disordered breathing, particularly obstructive sleep apnea.
Sleep disruption can produce daytime inattention, hyperactivity, irritability and poor school performance, closely mimicking ADHD.
The key principle is that ADHD is a clinical diagnosis of persistent symptoms that are not better explained by another condition. Before labeling this child as having ADHD, an important potentially reversible cause of his behavioral symptoms should be investigated.
Why not ADHD?
The symptoms may be secondary to chronic sleep disruption. Treating the presumed ADHD without addressing the underlying sleep problem may miss the actual cause of the child’s difficulties.
Exam pearl:
A hyperactive child who snores should have his sleep assessed before ADHD is diagnosed.
Reference:
Wolraich ML, et al. Clinical Practice Guideline for the Diagnosis, Evaluation, and Treatment of Attention-Deficit/Hyperactivity Disorder in Children and Adolescents. Pediatrics. 2019;144(4):e20192528
