DocumentCode :
2882191
Title :
Inhibition of atrial action potentials alternans by calcium-activated chloride current blockade - simulation study
Author :
Gomis-Tena, J. ; Saiz, J. ; Ferrero, JM, Jr.
Author_Institution :
Centro de Investigacion e Innovacion en Bioingenieria, Univ. Politecnica de Valencia, Spain
fYear :
2003
fDate :
21-24 Sept. 2003
Firstpage :
421
Lastpage :
424
Abstract :
Atrial fibrillation (AF) is the most common cardiac arrhythmia. Atrial action potential (AP) alternans appearance during atrial flutter play a determinant role as AF precursor. AP alternans involves intracellular calcium concentration alternation that affects calcium dependent currents like INaCa und IClCa. In this study, a modified rabbit atrial AP mode, that includes IClCa formulation is used. In order to induce alternans, the pacing cycle length was abruptly shortened from a basic drive of 1000 ms after 7.5 s of stimulation. The role of IClCawas investigated by blocking the current. When increasing pace rate, from a cycle length of 1000 ms to 180 ms, beat-to-beat alternans appear. Repeating the procedure in IClCablockade situation, in the range of 60 to 100 %, alternans disappear. Our results suggest that IClCa blockade prevents alternans and for this reason IClCa blockade could be potentially antiarrhythmic, preventing AF.
Keywords :
bioelectric potentials; biomembrane transport; calcium; cardiology; chlorine; 1000 ms; 180 ms; 7.5 s; Ca; Cl; atrial action potentials alternans; atrial fibrillation; atrial flutter; calcium-activated chloride current blockade; cardiac arrhythmia; intracellular calcium concentration alternation; modified rabbit atrial AP mode; pacing cycle length; Atrial fibrillation; Calcium; Contracts; Costs; Drugs; Electrocardiography; Heart; Hospitals; Rabbits; Rhythm;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computers in Cardiology, 2003
ISSN :
0276-6547
Print_ISBN :
0-7803-8170-X
Type :
conf
DOI :
10.1109/CIC.2003.1291182
Filename :
1291182
Link To Document :
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