Cellular Arrhythmogenic Effects of Congenital and Acquired Long-QT Syndrome in the Heterogeneous Myocardium
Why the study?
Does reducing IKs/IKr or enhancing late INa affect action potential duration and early afterdepolarization development in a heterogeneous myocardial cell model?
Population
Luo-Rudy dynamic cell model simulating epicardial, endocardial, and midmyocardial cells with IKs heterogeneity
Comparison
Reducing IKs or IKr or enhancing late INa vs Normal conditions and varying degrees of…
Design
Preclinical
Authors
Discussion
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Implication
May minimize EAD risk via IKs modulation in heterogeneous models; hypothesis-generating for LQTS therapy, leaves translation open.
Structured PICO
Does reducing IKs/IKr or enhancing late INa affect action potential duration and early afterdepolarization development in a heterogeneous myocardial cell model?
P
Population
Luo-Rudy dynamic cell model simulating epicardial, endocardial, and midmyocardial (M) cells with IKs heterogeneity
I
Intervention
Reducing IKs or IKr or enhancing late INa (to simulate 3 forms of long-QT syndrome)
C
Comparator
Normal conditions and varying degrees of intercellular coupling
O
Outcome
Action potential duration (APD) and development of arrhythmogenic early afterdepolarizations (EADs)surrogate
IKs heterogeneity and intercellular coupling strongly influence EAD development, and the ability of IKs block to minimize APD dispersion may have important implications for antiarrhythmic therapy in long-QT syndrome.
Cite This Study
Viswanathan et al. (2000) studied this question.