A young patient presents with syncope and a family history of sudden cardiac death in a sibling at a young age. Which of the following statements regarding management is true?
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Major risk factors for SCD in HCM include: Prior cardiac arrest, spontaneous sustained VT, family history of premature SCD, unexplained syncope, massive LV hypertrophy ($\geq$ 30 mm), and an abnormal blood pressure response to exercise.
Concept:
The clinical scenario of a young patient with syncope and a family history of Sudden Cardiac Death (SCD) in a young sibling is highly suspicious for Hypertrophic Cardiomyopathy (HCM) or an inherited arrhythmogenic disorder (like Long QT syndrome or Brugada syndrome).
The management of these conditions centers around preventing fatal arrhythmias and sudden cardiac death. Explanation: • Hypertrophic Cardiomyopathy (HCM) is the leading cause of sudden cardiac death in young athletes.
• The presence of syncope (especially exertional) and a first-degree relative with premature SCD are major high-risk markers for fatal arrhythmias.
• A universally accepted and critical first-line management step for all patients diagnosed with HCM (and other primary arrhythmogenic conditions) is the strict avoidance of competitive, high-intensity sports and strenuous exertion. This removes a major trigger for ventricular fibrillation and SCD.
• Option (B) is incorrect because Beta-blockers are actually the first-line medical therapy for symptomatic HCM. They negative inotropes that increase diastolic filling time and decrease the left ventricular outflow tract (LVOT) gradient.
• Option (C) is incorrect because Digoxin is a positive inotrope. In HCM, increasing cardiac contractility worsens the dynamic LVOT obstruction and is generally contraindicated.
• Option (D) is incorrect because while an Implantable Cardioverter-Defibrillator (ICD) is indicated for primary or secondary prevention in high-risk patients, a simple "pacemaker" is not the primary life-saving device for preventing SCD in this context. Final answer:
Avoiding high-intensity sports is a true and critical management strategy for preventing sudden cardiac death in such high-risk young patients.