Etiology Mechanism: hemorrhage into the decidua basalis leading to premature placental separation and further bleeding Associated factors o Maternal hypertension o Sudden decompression of the uterus ● Materna| cocaine use traumaEtiology Mechanism: hemorrhage into the decidua basalis, leading to premature placental separation and further bleeding. Associated factors: •Maternal hypertension •Sudden decompression of the uterus •Maternal cocaine use •trauma