A 16‑year‑old with long QT syndrome after syncope should be managed by which measure?

A 16‑year‑old with long QT syndrome after syncope should be managed by which measure?

• A. Avoiding further involvement in competitive sports
• B. Switching to a swim team for varsity sport
• C. Beginning mexiletine as an antiarrhythmic
• D. Taking beta blockers before competition

Answer: (A)

The key idea is that exertion and adrenergic surges can trigger dangerous arrhythmias in long QT syndrome. If a teenager has already had a syncope episode, his risk of recurrent torsades de pointes during intense physical activity is high, so the safest immediate step is to avoid competitive sports. This protective measure helps reduce triggers until the patient is evaluated and started on appropriate long-term therapy (such as beta-blockers and risk-stratified management, potentially with additional interventions). Starting mexiletine is not universally indicated for all long QT types and isn’t an immediate, sole protective measure in this scenario. Taking beta blockers before competition would help reduce risk, but it doesn’t by itself address the need to avoid high-risk exertion in the immediate post-syncope period. Switching to a different sport still involves exertion and adrenergic stress, so it does not eliminate the risk as effectively as temporary avoidance.

The key idea is that exertion and adrenergic surges can trigger dangerous arrhythmias in long QT syndrome. If a teenager has already had a syncope episode, his risk of recurrent torsades de pointes during intense physical activity is high, so the safest immediate step is to avoid competitive sports. This protective measure helps reduce triggers until the patient is evaluated and started on appropriate long-term therapy (such as beta-blockers and risk-stratified management, potentially with additional interventions). Starting mexiletine is not universally indicated for all long QT types and isn’t an immediate, sole protective measure in this scenario. Taking beta blockers before competition would help reduce risk, but it doesn’t by itself address the need to avoid high-risk exertion in the immediate post-syncope period. Switching to a different sport still involves exertion and adrenergic stress, so it does not eliminate the risk as effectively as temporary avoidance.