Key result
SVC radiofrequency ablation eliminates swallow-induced atrial tachycardia and syncope out to 11 months.
Why the study?
Swallow-induced syncope caused by atrial tachyarrhythmia originating from the superior vena cava is rare and mechanisms remain unclear.
Case Report (n=1)
May support SVC ablation for refractory swallow-induced atrial tachycardia in select patients; leaves open confirmation in larger studies.
We report the case of an 80-year-old woman with syncope and atrial tachycardia (AT) induced by swallowing. Pharmacologic therapy was ineffective, and she underwent catheter ablation of AT originating from the superior vena cava (SVC). Potential mechanisms of swallow-induced syncope including AT and parasympathetic stimulation are discussed. Electroanatomic correlation with the role for parasympathetic innervation from the aortocaval ganglionated plexus is provided.
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Hu et al. (2015) conducted a case report in Swallow-induced syncope and atrial tachycardia (n=1). Radiofrequency catheter ablation was evaluated on Freedom from swallow-induced symptoms. Radiofrequency catheter ablation of the superior vena cava successfully eliminated swallow-induced atrial tachycardia and syncope, with the patient remaining symptom-free at 11 months of follow-up.
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