Amenorrhea: No menses for 6 months.
Sheehan's syndrome: Anterior pituitary hemorrhagic necrosis caused by hypertrophy of the prolactin-secreting cells in conjunction with a hypotensive episode, usually in the setting of postpartum hemorrhage. Bleeding in the anterior pituitary induces pressure necrosis.
Intrauterine adhesions (Asherman's syndrome): Scar tissue that forms in the endometrium, leading to amenorrhea due to unresponsiveness of the endometrial tissue.
Postpartum hemorrhage: Classically defined as bleeding greater than 500 mL for a vaginal delivery and greater than 1000 mL for a cesarean delivery. From a more pathophysiologic standpoint, it is the amount of bleeding that results in. or threatens to result in. hemodynamic instability if left unabated.
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