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(a) Change in QTc from pre‐pregnancy to third trimester in congenital heart disease patients. (b) Median QTc change in women with baseline QTc in the lower three quartiles (Q1–3) and highest quartile (Q4) by disease type. Abbreviations: ASD, atrial septal defect; BAV, bicuspid aortic valve; CoA, coarctation of the aorta; PS, pulmonary stenosis; SysRV, systemic right ventricle; TOF, tetralogy of Fallot.
