The indications for aortoplasty and the techniques employed are described. The advantages of using Dacron patches are explained, namely: restricted mobilisation of the aorta, no sacrifice of intercostal vessels, no risk of haemorrhage from ectasic collateral vessels with weak walls, or from the calcified aorta wall, and simplicity. The method requires lengthwise section (extended as necessary) of the aorta where it is restricted following the application of clamps, removal of the stenosing diaphragm and application of a lozenge-shaped patch, with continuous suture of the anterior edges of the opening in the vessel. It is pointed out that the method is especially indicated in cases with marked atheromatous alterations and in chil-childrens, whose aorta is thereby enabled to grow normally, since a sufficient part of the wall is left in its natural continuity.