Value of a revised procainamide test in the Wolff-Parkinson-White syndrome
Identifieur interne : 000125 ( Istex/Curation ); précédent : 000124; suivant : 000126Value of a revised procainamide test in the Wolff-Parkinson-White syndrome
Auteurs : K. Atta Boahene [Canada] ; George J. Klein [Canada] ; Arjun D. Sharma [Canada] ; Raymond Yee [Canada] ; Osamu Fujimura [Canada]Source :
- The American Journal of Cardiology [ 0002-9149 ] ; 1990.
Abstract
A shortest preexcited RR interval < 250 ms during atrial fibrillation identifies the patient with Wolff-Parkinson-White syndrome potentially at risk for ventricular fibrillation. Loss of preexcitation after infusion of up to 10 mg/kg of procainamide during sinus rhythm has been reported to correlate with a slow ventricular response during atrial fibrillation and has been proposed as a noninvasive test to establish risk of sudden death in these patients. Others have failed to establish this relation and have questioned the usefulness of the procainamide test. Such conflicting results were hypothesized to be a result of differing dosages and methodology. Consequently, this study tested the effect of incremental doses of procainamide (to a cumulative dose of 1 g) on the anterograde effective refractory period of the accessory pathway and related the reliability of the procainamide test to the dose at which preexcitation was lost. The effect of procainamide on the anterograde effective refractory period of the accessory pathway was dose dependent; patients who lost preexcitation had a steeper dose-response curve. Loss of preexcitation by a cumulative dose of 550 mg provided the best balance for sensitivity (60%) and specificity (89%) in identifying patients with preexcited shortest RR >250 ms. Specificity fell steeply after this dosage and higher doses were not useful. The diagnostic accuracy of the procainamide test is critically related to dosage and method of infusion.
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DOI: 10.1016/0002-9149(90)90084-E
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Loss of preexcitation after infusion of up to 10 mg/kg of procainamide during sinus rhythm has been reported to correlate with a slow ventricular response during atrial fibrillation and has been proposed as a noninvasive test to establish risk of sudden death in these patients. Others have failed to establish this relation and have questioned the usefulness of the procainamide test. Such conflicting results were hypothesized to be a result of differing dosages and methodology. Consequently, this study tested the effect of incremental doses of procainamide (to a cumulative dose of 1 g) on the anterograde effective refractory period of the accessory pathway and related the reliability of the procainamide test to the dose at which preexcitation was lost. The effect of procainamide on the anterograde effective refractory period of the accessory pathway was dose dependent; patients who lost preexcitation had a steeper dose-response curve. Loss of preexcitation by a cumulative dose of 550 mg provided the best balance for sensitivity (60%) and specificity (89%) in identifying patients with preexcited shortest RR >250 ms. Specificity fell steeply after this dosage and higher doses were not useful. The diagnostic accuracy of the procainamide test is critically related to dosage and method of infusion.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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