The most common cause of postpartum hemorrhage

Written by Liu Wei Jie
Obstetrics
Updated on September 05, 2024
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Postpartum hemorrhage is divided into two scenarios. The first type occurs within 24 hours after childbirth and is seen in four situations. The first is due to inadequate uterine contraction, the second is trauma to the soft birth canal, the third concerns placental factors, and the fourth involves coagulation disorders. The second type of hemorrhage is late postpartum bleeding, which occurs one to two months after childbirth. This can be associated with postpartum infections, slow recovery of physical condition postpartum, retained products, and poor healing of cesarean section scars.

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Written by Yue Hua
Obstetrics and Gynecology
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How much bleeding is considered postpartum hemorrhage?

Postpartum hemorrhage refers to a condition where, if the patient has vaginal delivery, the bleeding exceeds 500 milliliters within 24 hours after the fetus is delivered. If the delivery is via cesarean section, the bleeding exceeds 1000 milliliters, which is considered significant postpartum hemorrhage. The primary cause is mostly related to poor uterine contractions. Due to inadequate muscle contractions of the uterus, the blood vessels in the uterine muscle layer remain open, leading to bleeding. Another cause relates to placental factors, such as when the placenta is not entirely expelled, leading to remnants of the placenta and membranes remaining in the uterine cavity, which can also cause postpartum bleeding.

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Written by Du Rui Xia
Obstetrics
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How many days of postpartum bleeding are normal?

Postpartum hemorrhage typically stops around three weeks. Lochia can be classified into bloody lochia, serous lochia, and white lochia. Another type is abnormal bleeding, which is pathological bleeding. It occurs postpartum, for instance, due to soft birth canal injuries, cervical lacerations, uterine atony, or pre-existing blood disorders, which may extend the bleeding duration even beyond a month. This abnormal condition requires prompt medical attention. Normal lochia during the initial three to four days is bloody. As the bleeding from the uterus gradually decreases, it transitions to serous lochia, which can last about ten days. Finally, it becomes white lochia, which clears up after about three weeks.

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Does postpartum hemorrhage require a blood transfusion?

The definition of postpartum hemorrhage is bleeding greater than 500 milliliters approximately 24 hours after vaginal delivery. Whether blood transfusion is necessary for postpartum hemorrhage mainly depends on the specific amount of bleeding. For average women, if the hemoglobin level is normal before delivery and the bleeding is between 500-1000 milliliters, the body can compensate for the anemia through normal adjustments, and generally, a blood transfusion is not required. However, if the bleeding exceeds 1000 milliliters, this situation is considered massive hemorrhage and must be treated with a blood transfusion, otherwise it may lead to hemorrhagic shock or DIC (Disseminated Intravascular Coagulation).

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Written by Yue Hua
Obstetrics and Gynecology
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Late postpartum hemorrhage clinical symptoms

Late postpartum hemorrhage occurs when significant uterine bleeding happens after the first 24 hours following the delivery of the fetus, commonly seen from one to two weeks postpartum. At this time, patients may experience sudden heavy vaginal bleeding, and some may even develop hemorrhagic shock. A minority of patients might not bleed profusely but may experience recurrent bleeding. Additionally, this bleeding is often accompanied by lower abdominal pain, fever, and symptoms of anemia, so it is critical to seek immediate medical treatment upon noticing these symptoms.

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Written by Tang Mei Xiang
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Postpartum Hemorrhage Etiology

The causes of postpartum hemorrhage can be broadly summarized into four main factors: 1) Inadequate uterine contraction. 2) Lacerations in the soft birth canal. 3) Placental factors. 4) Coagulation dysfunction. The most common cause in clinical settings is inadequate uterine contraction. The manifestation of inadequate uterine contraction primarily appears as the placenta and membranes being expelled intact postpartum, no injuries in the soft birth canal, and an unclear uterine contour upon palpation. The uterus becomes firm when massaged and softens when the massage stops. This condition is indicative of postpartum hemorrhage caused by inadequate uterine contraction. Postpartum hemorrhage due to lacerations in the soft birth canal typically presents as immediate bleeding following the delivery of the baby. The blood is bright red and may contain clots, which mostly suggests lacerations in the soft birth canal. If significant bleeding occurs about five to ten minutes after the delivery of the placenta and baby, this is generally considered to be related to placental factors. If the bleeding is unclotted and continuous, this severe hemorrhage might be due to a coagulation dysfunction.