Abortion, threatened spontaneous

Adverse reactions associated with their administration include hypertension, headache, and possible seizures. Nausea, vomiting, chest pains, difficulties in breathing, and leg cramps also have been reported. These alkaloids should not be used in cases of threatened spontaneous abortion or in patients with known allergies to the drugs. Contraindications generally include angina pectoris, myocardial infarction, pregnancy, and a history of a cerebrovascular accident, transient ischemic attack, or hypertension. 

B. Black widow envenomation in pregnancy may cause abdominal muscle spasms severe enough to threaten spontaneous abortion or early onset of... 

Diethylstilbestrol was used extensively in pregnancies between 1940 and about 1975, in the belief that it could protect threatened pregnancies and counter the risk of spontaneous abortion. Toward the end of that period, increasingly clear evidence emerged that diethylstilbestrol could have an adverse effect on the second generation that... 

Chashschin et al. (1994) reported increased incidences of congenital defects and spontaneous or threatened abortion in 758 Russian women who were employed in a nickel hydrometallurgical refining plant. They found congenital malformations in 17% of live-born infants of the nickel-... 

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