Figure 6. λ′ restitution curves plotting λ′ against λ′0.

Results obtained from typical (N= 1) WT (open symbols; black lines) and Scn5a+/− (filled symbols; grey lines) hearts in the RV epicardium (A) and RV endocardium (B), before (circles; continuous line) and following addition of flecainide (squares; dashed line) or quinidine (triangles; dotted line). The data displayed represent hearts showing the Mdn value of λ′max in the experimental group concerned. Such curves fall closer together particularly at low λ′0 values than the plots shown in either Figs 3 or 5, or previously reported APD restitution curves. Values could differ at higher values of λ′0.