Key result
Etilefrine plus salt and hydration resolves symptoms and prevents pacing in vagally-induced AV block.
Why the study?
In cases of syncope, high-degree AV block in young individuals without structural heart disease often leads to pacemaker implantation, underscoring the need to evaluate the autonomic nervous system for vagal hyperactivity.
Does combined dietary modification (hydration and high-salt diet) and pharmacological treatment with etilefrine hydrochloride improve clinical outcomes and avoid pacemaker implantation in young patients with vagally mediated atrioventricular block and recurrent syncope?
Case Report (n=4)
Does combined dietary modification (hydration and high-salt diet) and pharmacological treatment with etilefrine hydrochloride improve clinical outcomes and avoid pacemaker implantation in young patients with vagally mediated atrioventricular block and recurrent syncope?
In young patients with recurrent syncope and AV block without structural heart disease, autonomic nervous system testing can identify vagal hyperactivity, allowing effective treatment with hydration, salt intake, and etilefrine hydrochloride to avoid immediate pacemaker implantation.
Answers are grounded in this paper and cite their sources.
May support avoiding pacemakers in select young patients with vagally-induced AV block; leaves open need for prospective confirmation before practice change.
Vagal hyperactivity, associated with excessive parasympathetic activity, can lead to syncope, fainting, and dizziness, emphasizing the need to examine the autonomic nervous system (ANS). In cases of syncope, high-degree atrioventricular (AV) block often necessitates pacemaker implantation, particularly in young individuals without structural heart disease. We present four young patients experiencing recurrent syncope and AV block, with no structural heart issues, where the cause was linked to vagal hypersensitivity identified through ANS testing. These patients improved significantly with dietary adjustments and medication, avoiding the immediate need for pacemakers.
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Ashraf et al. (2026) conducted a case report in Atrioventricular block induced by vagal hyperactivity and recurrent syncope (n=4). Etilefrine hydrochloride (ethyl-phenylephrine) with high-salt diet and rehydration was evaluated on Clinical symptom improvement and avoidance of pacemaker implantation. Etilefrine hydrochloride combined with hydration and dietary salt improved symptoms and avoided pacemaker implantation at 1 month in all 4 young patients with vagally-induced AV block.
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