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Mustard and Senning procedures are interatrial repairs of transposition of the great arteries.
The underlying aim is to construct a baffle from pericardium or the atrial wall which directs the returning caval blood behind the baffle to the mitral valve, and hence left ventricle and pulmonary artery; the pulmonary venous return is directed in front of the baffle to the tricuspid valve, right ventricle and aorta.
This operation resolves the cyanosis because there is now a serial circulation created, but need not be undertaken as early as the arterial switch because the left ventricle will continue to be linked to the pulmonary circulation; it is usually undertaken at about 6 months.