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. 1977 Mar;59(3):481–489. doi: 10.1172/JCI108663

The electrophysiologic effects of quinidine in the transplanted human heart.

J W Mason, R A Winkle, A K Rider, E B Stinson, D C Harrison
PMCID: PMC333385  PMID: 320227

Abstract

Using His bundle recording techniques, we examined direct and autonomically mediated conduction system effects of quinidine in five cardiac transplant recipients who have anatomically denervated hearts. We made control conduction interval and refractory period measurements, and then infused 10 mg/kg quinidine gluconate over a 20-min period. At 30 min, we determined the electrophysiologic changes induced by quinidine. Quinidine significantly increased the atrial-His (AH) interval (from 97+/-9 [SEM] to 108+/-7 ms, P less than 0.001), the His-ventricular (HV) inteval (from 43.9 +/- 1 to 52.8 +/- 3 ms, P less than 0.01), the donor heart sinus cycle length (from 599 +/- 38 to 630 +/- 56 ms, P less than 0.08), and the atrial effective refractory period (from 214 +/- 14 to 241 +/- 11 ms, P less than 0.01). Quinidine significantly decreased the innervated, remnant atrial sinus cycle length (from 847 +/- 104 to 660 +/- 96 ms, P less than 0.01) and the blood pressure. The mean plasma concentration of quinidine at the time that electrophysiologic measurements were repeated was 4.37 +/- 0.449 micrograms/ml. We conclude that quinidine's predominant sinus nodal and atrioventricular nodal effects in man are autonomically mediated and opposite to its direct actions upon these structures. On the other hand, quinidine's prevailing effect on atrial refractoriness and His-Purkinje conduction in man is direct.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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