Amniotic fluid embolism.

Pulmonary embolism is the leading cause of maternal death in the United States. Amniotic fluid embolism (AFE) represents the least preventable and most lethal of complications. AFE has a reported mortality of 86% and an associated fetal demise of 50%. AFE is widely accepted as a clinical entity but is not completely understood. A combination of clinical presentation, laboratory findings, and exclusion of other abnormalities leads to the diagnosis of AFE. The mainstays of treatment are oxygenation, maintenance of cardiac output, and correction of coagulopathy. The prognosis for the patient experiencing AFE remains bleak because the course of the disorder is largely unpredictable, and AFE cannot be corrected. Only supportive measures can be given.