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• W2074939813 abstract "The mechanism(s) whereby a discrete area of myocardium in the RVOT becomes arrhythmogenic remains unknown.In 13 dogs, a circular catheter was placed in the proximal pulmonary artery (PA) to contact the endovascular circumference of the PA. A 50-msec train of high-frequency stimulation (HFS, 200 Hz), coupled to atrial pacing, was applied at each bipolar pair of the circular catheter. The coupling interval was adjusted so that the 50-msec train occurred during the ventricular refractory period, that is, the QRS complex, in order to prevent stimulation of the myocardial sleeve within the proximal PA.In all dogs, HFS induced ventricular premature depolarizations and VTs with a left bundle branch block (LBBB) morphology and inferior axis (average 6.8 +/- 1.6 V). Earliest activation was consistently recorded from the proximal PA. Esmolol, a short-acting beta-blocker (1 mg/kg), was administered intravenously in 11 dogs. The inducible ventricular ectopy was abolished in 10 dogs (>12 V, P < 0.05) and the response to HFS was blunted in one dog (10-11 V). After 30 minutes, the response to HFS returned to pre-esmolol levels.Stimulation of the sympathetic input to the proximal PA induces ventricular ectopy and VTs exhibiting a left bundle branch block morphology and inferior axis, closely simulating clinical RVOT-VT. Beta-blockade either abolishes or blunts this response, corroborating the sympathetic etiology in this model and in some clinical cases of RVOT tachycardias." @default.
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• W2074939813 date "2006-07-01" @default.
• W2074939813 modified "2023-10-16" @default.
• W2074939813 title "Experimental model simulating right ventricular outflow tract tachycardia: a novel technique to initiate RVOT-VT." @default.
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• W2074939813 doi "https://doi.org/10.1111/j.1540-8167.2006.00509.x" @default.
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