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. 2020 Mar 12;35(8):1135–1147. doi: 10.1007/s00380-020-01577-1

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© The Author(s) 2020

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Fig. 1 — CRT simulation. a Electrical circuit analog of systemic and pulmonary circulations. C*; capacitance R*; resistance b A diagram of CRT simulation c Lead positions. Pacing leads were placed in one of four combinations of segments indicated in the bull’s eye view of the left ventricle