Brugada Syndrome With Fever-Triggered Syncope
A 23-year-old man is evaluated after a syncopal episode that occurred at rest during a febrile illness with a temperature of 39.2°C. He had no prodrome, no seizure activity, and no injury. His ECG shows a type 1 Brugada pattern with coved ST elevation of 3 mm in V1 and V2. His father died suddenly at age 35, and genetic testing identifies a nonsense SCN5A variant. The patient is otherwise healthy, works as a software engineer, and has no history of ventricular arrhythmia on a 48-hour monitor. Echocardiography is normal. In the electrophysiology laboratory, programmed ventricular stimulation with up to three extrastimuli from the right ventricular apex and outflow tract fails to induce ventricular fibrillation. He asks whether he needs an implantable defibrillator, and whether the negative EP study means he is safe.
1. Does this patient meet criteria for an ICD, and how do you weigh the negative EP study?
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Yes. He has a spontaneous type 1 Brugada pattern and a syncopal episode, which places him in a high-risk group; current guidance supports ICD implantation for spontaneous type 1 pattern with syncope, especially with a family history of sudden death and an SCN5A variant. The syncope occurred during fever, but fever is a recognized trigger that unmasks Brugada and does not make the episode benign. The negative programmed stimulation is not reassuring enough to withhold ICD: in Brugada syndrome, EP study inducibility has limited negative predictive value and is not used alone to deny a device when clinical risk markers are present. I would discuss the high risk of appropriate shocks but also the real risk of complications in a young patient, including lead failure, infection, and inappropriate shocks. I would recommend ICD and simultaneous counseling about lifestyle and fever management.
2. What adjunctive management and device programming would you use, and what would you tell him about fever?
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I would program a single VF zone with a long detection interval to reduce inappropriate shocks, enable morphology and far-field criteria as available, and avoid unnecessary ATP in the VF zone. I would treat fever aggressively with acetaminophen and cooling, and I would give a written fever action plan: any febrile illness requires prompt antipyretics and medical evaluation. I would consider quinidine as adjunctive therapy if he has recurrent arrhythmias or frequent appropriate shocks, but quinidine is not a substitute for ICD in a symptomatic patient. I would advise avoidance of cocaine, excessive alcohol, and certain drugs that unmask Brugada, and I would screen first-degree relatives with ECG and genetic counseling. Follow-up would include device checks every 3 to 6 months and prompt evaluation of any shock.