The repository contains:1. Video example (example_LBBB.mp4). Simulation of accelerating sinus rhythm (120 to 171 bpm) in myocardial infarction (MI) and left bundle branch block (LBBB) conditions leading to arrhythmia. 2. Collection of anatomical models (ventricles and conduction system) used to create the population of models in the study. It includes variability in the infarct size (none, small, large) and multiple conduction delay conditions (LBBB, RBBB and left ventricle) in different sizes, locations and combinations. Models can be visualised in Paraview using the script paraview-alg-plugin.py. The file simulation_plan.xlsx provides further details on the population of models. 3. Simulation scripts, defining the scenario and model conditions of the simulations are described in these files, to be used in MonoAlg3D (https://github.com/LLRiebel/MonoAlg3D_C-2023).