Comparative quantitative electrophysiologic effects of adenosine triphosphate on the sinus node and atrioventricular node
Identifieur interne : 004C34 ( Main/Exploration ); précédent : 004C33; suivant : 004C35Comparative quantitative electrophysiologic effects of adenosine triphosphate on the sinus node and atrioventricular node
Auteurs : Arjun D. Sharma [Canada] ; George J. Klein [Canada]Source :
- The American Journal of Cardiology [ 0002-9149 ] ; 1988.
Abstract
A pharmacologic approach was used to characterize the sinus node (SN) and atrioventricular (AV) node responses to intravenous adenosine triphosphate (ATP) in 21 patients during electrophysiologic testing. ATP produced dose-dependent prolongation of spontaneous sinus cycle length. The mean maximal increase in sinus cycle length was 294 ± 60 ms (n = 10). The mean dose of ATP required to produce this maximal sinus cycle length prolongation was 3.5 ± 1.0 mg. The dose-response curve for sinus cycle length prolongation was sigmoid in shape with an EC50 of 0.39 mg derived from a median effect plot. There was a negative correlation between the control sinus cycle length and the dose of ATP required to produce the maximal prolongation of cycle length (p < 0.05). In contrast, the mean dose of ATP producing AV block was 4.4 ±0.97 mg and the EC50 was 2.98 mg. There was a positive correlation between the AV nodal functional refractory period and the prolongation of the AH interval with a 2 mg dose (p < 0.05). Consistent with the AV nodal dose-response curves, 8 mg ATP terminated paroxysmal reentrant supraventricular tachycardia at the AV node in 8 of 9 patients. Thus, SN and AV node responses to ATP have differences in their electrophysiologic correlates and EC50. These findings suggest that ATP has potentially different mechanisms of action on SN automaticity and AV nodal conduction that requires further investigation.
Url:
DOI: 10.1016/0002-9149(88)90939-3
Affiliations:
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Sharma</name><affiliation wicri:level="3"><country xml:lang="fr">Canada</country><wicri:regionArea>From the University Hospital, Robarts Research Institute, University of Western Ontario, London</wicri:regionArea><placeName><settlement type="city">Londres</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Grand Londres</region></placeName></affiliation></author><author><name sortKey="Klein, George J" sort="Klein, George J" uniqKey="Klein G" first="George J." last="Klein">George J. Klein</name><affiliation wicri:level="3"><country xml:lang="fr">Canada</country><wicri:regionArea>From the University Hospital, Robarts Research Institute, University of Western Ontario, London</wicri:regionArea><placeName><settlement type="city">Londres</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Grand Londres</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">The American Journal of Cardiology</title><title level="j" type="abbrev">AJC</title><idno type="ISSN">0002-9149</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1988">1988</date><biblScope unit="volume">61</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="330">330</biblScope><biblScope unit="page" to="335">335</biblScope></imprint><idno type="ISSN">0002-9149</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0002-9149</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A pharmacologic approach was used to characterize the sinus node (SN) and atrioventricular (AV) node responses to intravenous adenosine triphosphate (ATP) in 21 patients during electrophysiologic testing. ATP produced dose-dependent prolongation of spontaneous sinus cycle length. The mean maximal increase in sinus cycle length was 294 ± 60 ms (n = 10). The mean dose of ATP required to produce this maximal sinus cycle length prolongation was 3.5 ± 1.0 mg. The dose-response curve for sinus cycle length prolongation was sigmoid in shape with an EC50 of 0.39 mg derived from a median effect plot. There was a negative correlation between the control sinus cycle length and the dose of ATP required to produce the maximal prolongation of cycle length (p < 0.05). In contrast, the mean dose of ATP producing AV block was 4.4 ±0.97 mg and the EC50 was 2.98 mg. There was a positive correlation between the AV nodal functional refractory period and the prolongation of the AH interval with a 2 mg dose (p < 0.05). Consistent with the AV nodal dose-response curves, 8 mg ATP terminated paroxysmal reentrant supraventricular tachycardia at the AV node in 8 of 9 patients. Thus, SN and AV node responses to ATP have differences in their electrophysiologic correlates and EC50. These findings suggest that ATP has potentially different mechanisms of action on SN automaticity and AV nodal conduction that requires further investigation.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Angleterre</li><li>Grand Londres</li></region><settlement><li>Londres</li></settlement></list><tree><country name="Canada"><region name="Angleterre"><name sortKey="Sharma, Arjun D" sort="Sharma, Arjun D" uniqKey="Sharma A" first="Arjun D." last="Sharma">Arjun D. Sharma</name></region><name sortKey="Klein, George J" sort="Klein, George J" uniqKey="Klein G" first="George J." last="Klein">George J. Klein</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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