High levels of peripheral blood NK cells in women suffering from recurrent spontaneous abortion are reverted from high-dose intravenous immunoglobulins.

PROBLEM: To determine the levels of peripheral blood natural killer (NK) cells in healthy women and recurrent aborters, and the effect of intravenous immunoglobulins (IVIGs) on these levels. METHOD OF STUDY: A total of 659 women were evaluated for NK cells by means of flow cytofluorimetry: 42 non-pregnant healthy women, 394 non-pregnant recurrent spontaneous abortion (RSA) women, 36 pregnant healthy women and 187 pregnant RSA women. Fifty-four of the pregnant RSA women were treated with IVIG; in 18 of them NK cells were measured immediately before and after the very first IVIG infusion (0.5 g/kg body weight).
RESULTS: Blood NK cell results were increased in RSA pregnant/non-pregnant women, and significantly reduced by IVIG, even after the very first infusion. In RSA pregnant women treated by means of IVIG therapy, 92.3% success rate was observed.
CONCLUSIONS: High levels of NK cells are detected in women affected by RSA. IVIGs are capable of decreasing them with a short- and long-term efficacy, allowing having a very high success rate of pregnancies in RSA women.