Etiology:
Numerous factors have been suggested to play a causal role in abruptio placentae, but a unifying etiologic concept is still lacking. Some factors that have been suggested to play an etiologic role in the development of abruptio placentae are as follows: trauma; short umbilical cord or uterine anomaly; inferior vena cava compression; maternal hypertension; folic acid deficiency; cigarette smoking; maternal age and parity; cocaine abuse. Abruptio placentae is clearly not an "accident" in the great majority of cases, but rather an expression of a pathologic process of long duration. No better evidence exists than the risk of recurrence abruption in subsequent pregnancies. The risk of recurrence had been reported to be 5.5% to 16.6%, as much as 30 times the incidence in the general population