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Left ventricular mid-wall fibre strain during the cardiac cycle around the left ventricular circumference in the baseline heart, during acute (2.9 weeks) and chronic left bundle branch block (15.7 weeks). Note the stretching of septal fibres after aortic valve closure in the left bundle branch block phases (‘septal flash’ or ‘paradoxical septal motion’) which gets exacerbated in the chronic phase compared with the acute one.
