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Based on information of the CONS-LOCAT block, the 'DI/DQ CAL' block computes the best values of DI4 and DQ4, while the 'XDE-CODE' block finds the best values of x 4 I and x 4 Q. Figure 8 Block diagram of 'STAGE 4' and 'STAGE 3'STAGE
The second contribution to the preserved APD in hAdultV-CM after I CaL block comes from I NaL.
The simulations then showed that APD after I CaL block was close to that obtained in VL hiPSC-CM.
The analysis therefore suggests that the differences in the response of hAdultV-CM and hiPSC-CM to I CaL block are due to differences in I NaCa and I NaL currents.
The first main difference we observed between VL hiPSC-CM and hAdultV-CM is the stronger APD reduction, induced by I CaL block, in the first model than in the second one.
Nevertheless, quantitative differences were identified, such as (i) I CaL block shortened APD more in hiPSC-CMs than in hAdultV-CM and (ii) I K1 block elevated MDP in hiPSC-CMs but not in hAdultV-CM.
Quantitatively, we showed how the increased sensitivity of the hiPSC-CMs was mainly due to the overexpression of I NaCa in the case of I CaL block, whereas it was due to the reduced repolarization reserve in the case of I K1 block.
By fully blocking the I NaL and I CaL at the same time in the hAdultV-CM model with the hiPSC-CM I NaCa formulation, an even larger APD90 reduction was achieved that almost equalled the shortening shown in hiPSC-CM after I CaL block (see in Figure S4 the magenta curve almost superimposed to the blue one).
Our new results showed a qualitatively similar response to current block between both cell types in several cases: (i) I Na block induced a reduction of VMax, peak voltage and AP amplitude; (ii) I CaL block shortened the APD; (iii) I Kr block prolonged the APD; (iv) I to block increased the peak voltage; and (v) low sensitivity was found to I Ks block.
When L-type calcium current (I CaL) and rapidly activating potassium current (I Kr) blocks are simultaneously applied, QT interval is more sensitive to the degree of I CaL block whereas T-wave amplitude is mostly determined by I Kr block.
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Called Block by Block, the programme is part of a collaboration between Minecraft-maker Mojang and UN Habitat.
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