Objective. To set forth the methods of diagnosis and treatment of neph
rotic syndrome during pregnancy (NSP) so as to decrease perinatal mort
ality. Materials and Methods. Forty cases of NSP including 5 twins in
Tianjin Central Hospital of Obstetrics and Gynecology in the past 13 y
ears have been reviewed, and the diagnosis and treatment were compared
between group A (1979-1990, 23 cases) and group B (1991-1999, 17 case
s). Results. NSP occurred before the 20th gestational week in 15% of c
ases and the patient's condition was serious. Clinically, NSP was clas
sified into three types, simple, nephritis and pregnancy induced hyper
tension (PIH) type. The perinatal maternal and fetal prognosis was poo
r. Complications occurred in 27.5% of patients. One patient died from
eclampsia and disseminated intravascular coagulation (DIG). The total
perinatal mortality was 42.22%, with group A (27 babies including 4 tw
ins), 51.86% (14/27); and group B (18 babies including 1 twin), 27.78%
(5/18) (P<0.01). Conclusions. NSP is a result of reproductive immunol
ogy and belongs to type III allergic reaction in terms of immunology.
Early diagnosis, early treatment and timely termination of pregnancy m
ay improve the outcome.