Pacing Techniques to Guide the Therapy of Tachycardias

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It is often difficult to tell whether an antiarrhythmic drug will prevent tachycardia. Drug suppression of isolated ectopic beats, often incomplete and inconsistent, does not always prevent tachycardia. Moreover, some patients with sporadic tachycardias have few ectopic beats between tachycardiac episodes. Tape-recorded monitoring is the most objective measure of therapeutic response if paroxysms of tachycardia are so frequent as to be expected during the prescribed monitored period. In most patients, sustained tachycardias are so infrequent that monitoring is impractical. Exercise testing has, in some studies, induced tachycardia not seen with ambulatory monitoring, but the prevalence of tachycardia is low and

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