[Fetal cardiac interventions]

Fetal cardiac interventions are being performed with growing success by a minimally invasive percutaneous and transthoracic approach. The primary aim of these interventions is to minimise postnatal morbidity and mortality, rarely also to achieve intrauterine survival. Valvuloplasty in utero for severe aortic stenosis is performed in order to achieve sufficient growth of the left ventricle and to make a later biventricular repair possible. In rare cases with hydrops secondary to massive left ventricular dilatation and mitral insufficiency it is used as a salvage therapy. Premature obstruction of the foramen ovale can be treated by balloon atrioseptoplasty or stenting of the atrial septum with the aim to attain a decompression of the left atrium and consequently of the pulmonary veins. This might reduce the extent of pulmonary hypertension and the resulting vascular and parenchymal changes in affected infants. Intrauterine valvuloplasty of a highly stenotic pulmonary valve or a pulmonary atresia with intact ventricular septum in order to prevent hypoplasia of the right ventricle and to enable postnatal biventricular repair is only rarely justified. Currently these intrauterine cardiac interventions are limited to a small group of fetuses with cardiac defects. However, with enhanced imaging modalities and equipment and with growing experience, fetal cardiac interventions are likely to increase in the next years.