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Tumor necrosis factor alpha is elevated in the peritoneal fluid from women with ruptured ectopic pregnancies.

The purpose of this study was to determine whether exposure of the peritoneum to fetal tissue is associated with elevated tumor necrosis factor alpha (TNF alpha) levels in the peritoneal cavity. We measured TNF alpha levels in the peritoneal fluids and serum from women with ruptured ectopic, unruptured ectopic and intrauterine pregnancies, as well as nonpregnant women undergoing tubal ligation. The results showed that patients with ruptured ectopic pregnancies were more likely to have TNF alpha levels in the peritoneal fluid greater than 40 units/ml (68%), compared with women with unruptured ectopic or intrauterine pregnancies (21%) (p less than 0.05, Fisher exact test). No elevation of peritoneal fluid TNF alpha levels was found in nonpregnant patients. Because TNF alpha is primarily a product of activated macrophages, it is likely that elevated TNF alpha levels in the peritoneal fluid of women with ruptured ectopic pregnancies reflects activation of peritoneal macrophages.