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Prevention of reciprocating tachycardia by programmed electrical stimulation

Prevention of reciprocating tachycardia by programmed electrical stimulation

Zeitschrift fuer Kardiologie 74(7): 397-401

Patients (10) with an accessory atrioventricular pathway were studied by means of programmed electrical stimulation to test the feasibiltity of tachycardia prevention with an extrastimulus delivered after the tachycardia-initiating beat. Reciprocating atriocentricular tachycardia was reproducibly initiated from high right atrium in all 10 patients with a single extrastimulus. A 2nd extra stimulus delivered to the same site resulted in prevention of tachycardia in all patients, when this extrastimulus was given within a preventive zone which started 10 ms after the effective atrial refractory period of the tachycardia initiating beat. The average width of the preventive zone was 50 ms in the patients, independent of the intial tachycardia interval or tachycardia cycle length. Tachycardia prevention was always successful with a single atrial extrastimulus, whereas termination of ongoing tachycardia required at least 2 atrial or ventricular extrastimuli.

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Accession: 006181082

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