From Kaplan I learned that class 1C do not change Action Potential duration.
BUT I just read this q in UW which says class 1A, 1C and class 3 all increase QT interval.
i do not understand how APD do not correlates with QT interval.
what is QT interval exactly? it is ventricular contraction .what does action potential durartion mean? is not QT INTERVAL a part of APD?
QT interval means ventricular refractoriness. i think it corresponds to ERP ( effective refractory period) and action potion duration is 'approximately' equal to ERP..
APD= ERP+ RRP
I hope i am right...
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