In the third patient, a 20 pole electrode catheter was used to map the crista terminalis and guide the ablation. The three patients described here had IST by clinical, electrocardiographic and electrophysiological criteria and were refractory to multiple antiarrhythmic drugs. All three patients who underwent RF modification of the sinus node had a successful outcome. RF modification of the sinus node is feasible and effective for IST, and should be the treatment of choice in patients refractory to medical therapy. Surgical excision of the sinus node in a patient with inappropriate sinus tachycardia.
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