Arch Dis Child Fetal Neonatal Ed 2013;98(Suppl 1):A1-A112 A21 Abstracts We construct a computational model of the electrophysiology of the developing heart. Anisotropic geometry at ~100 µm voxel resolution was obtained from Diffusion Tensor and Fast Low Angle Shot Magnetic Resonance Imaging and electrical activity from fetal electrocardiograms obtained longitudinally from one gestation and from multiple studies. Transmural myofibre organisation is established by 136 days gestational age (DGA)

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... d during 2 nd and 3 rd trimester QR intervals decrease by 20 ms while heart dimensions increase by a 2-fold. This implies an increase in the ventricular conduction velocity. A computational model of the 140 DGA human ventricle is presented that combines cell electrophysiology with anisotropic geometry.