[Real time and pulsed Doppler echography in the diagnosis of hydrocephaly in the preterm newborn infant].

An evaluation of the cerebral blood flow by means of a Toshiba model Sonolayers-S SSH-60 A ultrasonograph was carried out in 44 children preterm born through the major fontanella and was divided in two groups: 1.) twenty-nine children neurologically normal in which the resistance index always achieves higher marks than the children born at term at the expense of a lesser diastolic flow, and a which a physiologic diastolic modification is described. 2.) a last group of fifteen preterm new born with obstructive hydrocephalus. In this group, the Doppler echography has no diagnostic value, due to the fact that the diastolic flow is too low.