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Prenatal Diagnosis and Management of Nonimmune Hydrops Fetalis

We examined the incidence, aetiological factors and outcome in 40 cases of nonimmune hydrops fetalis (NIH) and suggest a rational approach to management. The incidence of NIH was 1 in 830 deliveries during the last 10‐year period. In spite of extensive antenatal and postnatal investigation no cause could be established in 14 (35%) cases. A probable aetiological factor was found in 65% of cases. These included viral infection (7), cardiovascular (6), twin‐to‐twin transfusion (3), chromosomal abnormality (3), other malformation syndromes (4), renal dysplasia (1), laryngeal atresia (1) and severe fetomaternal haemorrhage (1). Five of the 40 fetuses survived, 2 treated antenatally for tachyarrhythmia, 2 had spontaneous resolution and the fifth fetus had repeated intrauterine transfusions because of human parvovirus B19‐induced anaemia. After diagnosis of nonimmune hydrops fetalis, early referral to a tertiary centre is to be encouraged for investigation and provision of intensive perinatal care. Investigation allows parents to be counselled appropriately that the mortality is no longer 100% and a steadily growing number may be amenable to some form of fetal therapy.