[The diagnostic value of kymography in aortic isthmus stenosis (author's transl)].

The value of kymography was studied in 133 patients in whom a coarctation had been demonstrated angiographically, operatively or pathologically; its value was compared with conventional radiographic examinations. The difference in pulsation between the pib notching, dilatation of the ascending aorta and increased size of the left ventricle on plain films make it possible to diagnose an haemodynamically significant coarctation without any invasive methods. In 124 haemodynamically significant coarctations (93%), the kymogram showed increased pulsation of the dilated left subclavian artery. In nine haemodynamically insignificant or mild coarctations (7%), this sign was absent. Since the radiographic signs are to some extent reversible, it is possible to evaluate the results of surgery by plain chest films and the kymogram.