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ADHD Stimulant Cardiovascular Effects — MRCPsych Paper B MCQ

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ModerateChild & Adolescent PsychiatryADHD Stimulant Cardiovascular EffectsMRCPsych Paper B

A 14-year-old boy with ADHD takes modified-release methylphenidate 54 mg daily. At two separate reviews, after an adequate period of rest, his resting heart rate is 126 and 124 beats per minute. An ECG shows sinus tachycardia, and his systolic blood pressure is below the 95th centile for his age and height. According to NICE NG87, what is the most appropriate management?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: C — Reduce the methylphenidate dose and refer to a paediatric hypertension specialist

Explanation lettering: E = shown as B · B = shown as C · C = shown as E

B is correct. NICE NG87 recommends reducing the ADHD medication dose and referring to a paediatric hypertension specialist when a child or young person has sustained resting tachycardia above 120 beats per minute on two occasions. Both readings meet that threshold. Continuing unchanged with routine monitoring is therefore inappropriate. Permanent cessation is not automatically required by this recommendation; management begins with dose reduction and specialist assessment. Switching directly to another stimulant could perpetuate cardiovascular adverse effects and should not precede assessment. Adding a beta-blocker to permit continuation at the same stimulant dose is not the NICE-recommended response and could mask the adverse effect without addressing its cause.

Reference: National Institute for Health and Care Excellence. Attention deficit hyperactivity disorder: diagnosis and management (NG87), recommendations 1.8.9–1.8.11. 2018; last updated 2019 and reviewed 2025. https://www.nice.org.uk/guidance/ng87/chapter/recommendations