抄録
In order to clarify the safety of Ca-DTPA and Zn-DTPA recommended to use as drugs in the therapeutic removal of incorporated radionuclides from the human body, the teratological study on these two agents was carried out in rats as one of a series of the toxicological tests. The teratological effects of DTPA were observed because the fetus is highly susceptible to any drug. The pregnant females of Wistar rat were injected subcutaneously daily on days 9-13 of gestation with 1, 6, 12, 24 and 36 H. D. (H. D.=human dose, 1 H. D.=30μmol/kg body weight) of Ca-DTPA or Zn-DTPA, respectively. In the dams, no toxic effects were observed. In the fetuses, the decrease of the survival rate was observed in only the group injected daily with 36 H. D. of Ca-DTPA. Some cases of gross defects of fetuses: the exencephaly, microphthalmia, anophthalmia and fusion of ribs were observed in the groups injected daily with 12, 24 and 36 H. D. of Ca-DTPA.
The results obtained show that Ca-DTPA should not be given to a pregnant woman. However, no toxic effects of either Ca-DTPA or Zn-DTPA observed in the dams and of Zn-DTPA even in the fetuses indicate that these agents can be used by a radiation worker who usually is an adult man.
