Vỡ thai ngoài tử cung và chảy máu thai kỳ sớm¶

Mang thai ngoài tử cung xảy ra khi trứng được thụ tinh làm tổ và bắt đầu phát triển bên ngoài khoang chính của tử cung, phổ biến nhất là bên trong ống dẫn trứng hẹp (95 đến 97% trường hợp, được gọi là thai trong ống dẫn trứng), hoặc hiếm gặp hơn ở buồng trứng, cổ tử cung, giác mạc tử cung hoặc vết sẹo mổ lấy thai trước đó. Vì ống dẫn trứng chỉ rộng 1 đến 4 mm (0,04 đến 0,16 inch) và không có thành cơ dày nên phôi đang phát triển và các mạch máu nhau thai chắc chắn sẽ căng ra và ăn mòn qua thành ống dẫn trứng, điển hình là từ 5 đến 10 tuần của thai kỳ (thường là trước khi bệnh nhân biết mình có thai). Khi ống dẫn trứng vỡ, các nhánh có dòng chảy cao của động mạch tử cung và buồng trứng sẽ đổ 1.000 đến 2.500 ml (2 đến 5 pint) máu trực tiếp vào khoang bụng (chảy máu phúc mạc) với rất ít hoặc không có hiện tượng chảy máu âm đạo. Thai ngoài tử cung vỡ là nguyên nhân số một gây tử vong mẹ trong ba tháng đầu trên toàn thế giới, cần được vận chuyển ngay lập tức bằng xe cứu thương để phẫu thuật nội soi cấp cứu và truyền máu.

Làm điều này ngay bây giờ¶

1. Gọi ngay số điện thoại cấp cứu tại địa phương của bạn nếu người đang mang thai (hoặc có khả năng đang mang thai) bị đau vùng chậu một bên kèm theo chóng mặt, ngất xỉu, da nhợt nhạt hoặc đau bả vai. Quay số 911 ở Hoa Kỳ và Canada, 112 trên khắp Liên minh Châu Âu, 999 ở Vương quốc Anh hoặc xem tất cả số khẩn cấp. Nói rõ với người điều phối: " Nghi thai ngoài tử cung vỡ, chảy máu trong và sốc" nên đội cấp cứu chuẩn bị dịch truyền tĩnh mạch và báo cho phòng mổ sản bệnh viện.
2. Đặt nạn nhân nằm ngửa (hoặc hơi nghiêng về bên trái) và KHÔNG để nạn nhân đứng hoặc đi. Đứng thẳng hoặc ngồi trong bồn cầu khi hơn một lít máu ứ đọng trong bụng khiến huyết áp giảm ngay lập tức (ngất tư thế), dẫn đến mất ý thức đột ngột, chấn thương đầu trên sàn phòng tắm và ngừng tim. Giữ cô ấy nằm trên giường hoặc sàn nhà cho đến khi nhân viên y tế nâng cô ấy lên cáng.
3. Give strictly NOTHING by mouth (no water, food, or pain medications). A ruptured ectopic pregnancy can only be stopped in the operating room under general anesthesia. Keep the patient strictly nothing by mouth (NPO) so she does not vomit and inhale stomach contents into her lungs during emergency endotracheal intubation. In addition, never give aspirin, ibuprofen, or naproxen, which impair blood platelet clotting and worsen internal hemorrhage.
4. Never insert tampons, never douche, and never press down on the lower abdomen. If vaginal bleeding is present, place a clean external sanitary pad (maternity pad) in the underwear so doctors can estimate external blood loss by counting how many pads are soaked per hour. Do not press or palpate the lower belly: firm pressure on an unruptured or leaking tubal pregnancy can burst the distended fallopian tube and trigger catastrophic arterial bleeding.
5. Keep the patient warm with blankets and monitor her pulse and breathing every 3 to 5 minutes. Cover her with a warm blanket and place insulation underneath her if she is lying on a tile floor. Preventing hypothermia (core temperature below \(35^\circ\text{C}\) or \(95^\circ\text{F}\)) is critical because cold blood loses its ability to clot. If she becomes unconscious, roll her onto her left side in the lateral recovery position to keep her airway clear.
6. Confirm pregnancy status if unknown and gather medical history for paramedics. Note the first day of her last normal menstrual period (LMP), whether she has an intrauterine device (IUD / coil) or a prior tubal ligation ("tubes tied"), any history of prior ectopic pregnancy or pelvic inflammatory disease, and her Rh blood type (if known). Tell paramedics immediately if she has experienced pain while trying to open her bowels or urinate, which is a classic sign of liquid blood pooling in the pelvic Pouch of Douglas.

First-trimester bleeding and acute pelvic pain clinical decision tree¶

Use this triage flowchart for any female of reproductive age (from puberty to menopause, roughly ages 12 to 52) presenting with lower abdominal pain or vaginal bleeding.

flowchart TD
    Start["Female of Reproductive Age (12 to 52 yrs) with:<br/>Positive Pregnancy Test, Missed/Late Period, OR Irregular Spotting<br/>PLUS Pelvic/Abdominal Pain or Vaginal Bleeding"] --> RedFlagCheck{"Are ANY Ruptured Ectopic / Shock Red Flags Present?<br/>1. Dizziness, lightheadedness, or fainting (syncope)<br/>2. Sharp pain at the tip of the shoulder (Kehr's sign)<br/>3. Severe or worsening one-sided (unilateral) lower belly pain<br/>4. Pain/pressure when trying to pass stool or urinate<br/>5. Pale, cold, clammy skin or fast pulse (>100 bpm)<br/>6. Soaking >= 2 maxi pads per hour for 2 hours"}

    RedFlagCheck -->|"YES: Any single red flag present"| Emergency911["CRITICAL SURGICAL EMERGENCY (Suspected Ruptured Ectopic / Hemorrhage):<br/>1. Call 911 / 112 / 999 Immediately<br/>2. Lay flat on back (or left side if nauseated/unconscious); DO NOT let walk<br/>3. Keep Strictly Nothing by Mouth (NPO) for emergency surgery<br/>4. Keep warm with blanket; use external sanitary pad only"]

    RedFlagCheck -->|"NO: Hemodynamically stable,<br/>no fainting, no shoulder pain"| PainVsBleed{"What symptoms are present right now?"}

    PainVsBleed -->|"Mild-to-moderate one-sided pelvic ache<br/>OR dark brown 'prune-juice' spotting"| UrgentSameDay["HIGH RISK FOR UNRUPTURED ECTOPIC PREGNANCY:<br/>Go to Emergency Department or Early Pregnancy Assessment Unit (EPAU) TODAY<br/>Requires same-day Transvaginal Ultrasound + Quantitative Serum beta-hCG<br/>Do NOT wait for a routine prenatal appointment next week"]

    PainVsBleed -->|"Midline menstrual-like cramping<br/>with pink/red vaginal bleeding"| MiscarriageEval["Possible Threatened, Incomplete, or Complete Miscarriage:<br/>Contact OB/GYN or Early Pregnancy Clinic within 24 hours for Ultrasound<br/>and Rh(D) Blood Type check (Anti-D / RhoGAM needed within 72 hrs if Rh-negative)<br/>Go to ER immediately if pain shifts to one side or bleeding increases"]

    PainVsBleed -->|"Painless light spotting only<br/>around expected period date"| LightSpotEval["Possible Implantation Bleeding, Cervical Ectropion, or Subchorionic Hematoma:<br/>Avoid tampons and sexual intercourse; schedule prompt ultrasound<br/>to confirm an intrauterine pregnancy (IUP) inside the uterus"]

Comparing causes of first-trimester bleeding and pelvic pain¶

Because up to 20 to 25 percent of all pregnancies experience some vaginal spotting or bleeding during the first 12 weeks, distinguishing a life-threatening ectopic pregnancy from a miscarriage or harmless subchorionic hematoma saves lives.

Anatomy and pathophysiology: Why a ruptured fallopian tube bleeds so fast¶

To understand why a woman with a ruptured ectopic pregnancy can go from walking and talking to full cardiac arrest in under 45 minutes, consider the anatomy of the female pelvis:

1. Why the fallopian tube cannot stretch like the uterus: The normal human uterus has a thick, multilayered smooth-muscle wall (myometrium) engineered to expand 500-fold in volume over 9 months. In contrast, the fallopian tube (ampulla and isthmus) is a delicate, hair-thin muscular conduit lined with microscopic cilia whose only job is to sweep a fertilized egg into the uterus over 3 to 5 days. When the embryo gets stuck in the fallopian tube, invasive trophoblast cells (which are programmed to burrow into deep maternal blood vessels to build a placenta) burrow straight through the paper-thin wall of the fallopian tube and tap directly into the tubal branches of the uterine artery and ovarian artery.
2. Dual arterial blood supply under pregnancy vasodilation: During early pregnancy, maternal hormones increase pelvic blood flow and cardiac output. Because the fallopian tube sits along an arterial arcade fed from both ends (by the uterine artery from the internal iliac artery medially, and by the ovarian artery directly off the abdominal aorta laterally), a tear across the fallopian tube opens a high-pressure two-way arterial gusher into the free peritoneal cavity.
3. Why Kehr's Sign (Shoulder-Tip Pain) happens: There is nothing wrong with the patient's shoulder joint. When \(500\text{ to }1,500\text{ milliliters}\) of liquid blood spill out of the pelvis and the woman lies down flat (or leans back on a couch), gravity causes the warm liquid blood to flow upward along the paracolic gutters and pool directly underneath the muscular diaphragm (the dome muscle separating the abdomen from the chest). The underside of the diaphragm is innervated by the phrenic nerve, which originates in the neck at cervical spinal nerve roots C3, C4, and C5. Because those exact same C3, C4, and C5 nerve roots also supply the skin over the top of the shoulder and collarbone (supraclavicular nerves), the brain misinterprets diaphragmatic blood irritation as sharp, stabbing pain right at the tip of the shoulder.
4. Why "Bathroom Fainting" and Rectal Pressure happen (Pouch of Douglas pooling): When the woman is upright or sitting, blood pools in the lowest gravity pocket of the female pelvis: the rectouterine pouch (Pouch of Douglas / posterior cul-de-sac), which sits immediately in front of the rectum. Blood distending this space presses directly on the rectum and pelvic parasympathetic nerves, giving the woman a sudden, intense urge that she "needs to have a bowel movement." She walks into the bathroom, sits on the toilet, and strains, which drops venous return to her heart and causes immediate syncopal collapse on the bathroom floor.

Hidden traps: Why you can still have an ectopic pregnancy with an IUD, "tubes tied," or after "getting your period"¶

Three common misunderstandings delay emergency care every day:

1. "She just had her period last week, so she cannot be pregnant"¶

Up to 30 percent of patients diagnosed with a ruptured ectopic pregnancy report that they had what they thought was a normal or slightly light menstrual period 1 to 3 weeks earlier. In reality, when an ectopic pregnancy implants in the fallopian tube, it produces lower-than-normal levels of human chorionic gonadotropin (\(\beta\text{-hCG}\)) and progesterone, causing the lining of the empty uterus to slough and bleed right around the time a period was due. Any female of reproductive age with acute unilateral pelvic pain, shoulder pain, or unexplained fainting must have a urine or blood pregnancy test immediately, regardless of her menstrual history.

2. "She has an IUD (Intrauterine Device / Coil) or had a Tubal Ligation ('Tubes Tied')"¶

While intrauterine devices (such as Mirena, Kyleena, Liletta, or Copper ParaGard IUDs) and surgical tubal sterilization are over 99 percent effective at preventing pregnancy inside the uterus, if a rare pregnancy DOES occur while an IUD is in place or after a prior tubal ligation, there is a 15 to 50 percent chance that the pregnancy is an ECTOPIC pregnancy in the fallopian tube. Having an IUD or tied tubes actually places a pregnant patient in the highest possible risk category for tubal rupture.

3. Major medical risk factors for ectopic pregnancy¶

While roughly 50 percent of all women diagnosed with an ectopic pregnancy have ZERO known risk factors, the risk is significantly elevated in patients with: - A previous ectopic pregnancy (10% to 25% recurrence risk). - Previous Pelvic Inflammatory Disease (PID) or prior Chlamydia trachomatis or Neisseria gonorrhoeae infection (which leaves microscopic scar adhesions inside the delicate cilia of the fallopian tube). - Prior fallopian tube surgery, tubal ligation reversal, appendectomy (especially ruptured appendix), endometriosis, or pelvic surgery. - In Vitro Fertilization (IVF) and Assisted Reproductive Technology (ART): Including a rare condition called a heterotopic pregnancy, where one embryo implants normally inside the uterus AND a second twin embryo implants simultaneously inside the fallopian tube (occurring in roughly 1 in 100 to 1 in 1,000 IVF pregnancies). - Cigarette smoking (nicotine and cotinine paralyze the rhythmic beating of fallopian tube cilia, slowing embryo transport).

How to evaluate external vaginal bleeding volume and the Rh-Negative (Anti-D / RhoGAM) 72-hour rule¶

If a first-trimester patient is having visible vaginal bleeding (whether from an ectopic pregnancy or a miscarriage), doctors need two critical pieces of information:

1. Counting maxi pads per hour (The "2 Pads Per Hour for 2 Hours" Hemorrhage Rule)¶

• Place a standard full-size external sanitary pad (maxi pad) in the underwear (never use a tampon or menstrual cup, which traps blood inside the vagina and can introduce bacteria through an open cervix).
• Emergency Hemorrhage Threshold: If vaginal bleeding is heavy enough to completely soak through 2 or more full-size maxi pads per hour for 2 consecutive hours (or 1 pad every 15 to 30 minutes), or if the patient passes blood clots larger than a golf ball or lemon (\(4\text{ to }5\text{ centimeters}\) / \(1.5\text{ to }2\text{ inches}\)), call 911 / 112 / 999 immediately.
• If grey or pink solid tissue is passed: If the patient passes solid tissue during a suspected miscarriage, gently place the tissue into a clean glass jar or plastic container (or wrap it in a damp clean paper towel inside a sealed plastic bag) and bring it to the hospital so pathologists can inspect it for chorionic villi (confirming an intrauterine miscarriage rather than an ectopic pregnancy).

2. The Rh-Negative Blood Type Rule (Anti-D Immunoglobulin / RhoGAM)¶

If the pregnant woman has Rh-negative blood (\(A\text{-negative}, B\text{-negative}, AB\text{-negative}, \text{or } O\text{-negative}\)) and has an ectopic pregnancy, a threatened or complete miscarriage, or abdominal trauma, fetal Rh-positive red blood cells can enter her bloodstream and sensitize her immune system to attack future babies (hemolytic disease of the fetus and newborn). - Be sure to ask the hospital or Early Pregnancy Assessment Unit whether she requires an intramuscular injection of Anti-D immunoglobulin (RhoGAM) within 72 hours of the start of bleeding or surgery (following national guidelines from ACOG in the United States, RCOG/NICE in the United Kingdom, and SOGC in Canada).

What happens at the hospital: Transvaginal ultrasound, the hCG Discriminatory Zone, and treatment¶

Knowing how hospital emergency physicians and obstetricians diagnose and treat an ectopic pregnancy helps partners and families understand what is happening:

1. Point-of-Care FAST Ultrasound and Transvaginal Ultrasound (TVUS): Within minutes of ambulance arrival for an unstable patient, emergency doctors place an ultrasound probe on the abdomen (FAST exam: Focused Assessment with Sonography in Trauma) looking at Morison's pouch (between the liver and right kidney) and the pelvic cul-de-sac. Seeing dark liquid blood in Morison's pouch confirms at least \(500\text{ to }1,000\text{ milliliters}\) of free blood in the abdomen and triggers immediate transfer to the operating room without waiting for lab work. In stable patients, a high-resolution transvaginal ultrasound checks the uterus and adnexa for a gestational sac, yolk sac, or a "tubal ring" / "ring of fire" mass next to the ovary.
2. Quantitative Serum \(\beta\text{-hCG}\) and the Discriminatory Zone: Doctors draw blood to measure the exact numerical level of beta-human chorionic gonadotropin (\(\beta\text{-hCG}\)). Once serum \(\beta\text{-hCG}\) reaches the discriminatory zone of \(1,500\text{ to }3,500\text{ mIU/mL}\) (\(IU/L\)), a normal healthy pregnancy inside the uterus should almost always be visible on transvaginal ultrasound; an empty uterus combined with a \(\beta\text{-hCG}\) above \(3,500\text{ mIU/mL}\) (or a \(\beta\text{-hCG}\) that fails to rise appropriately over 48 hours in a "Pregnancy of Unknown Location" [PUL]) strongly points to an ectopic pregnancy.
3. Surgical vs. Medical Treatment:
4. Emergency Laparoscopic Surgery (Salpingectomy or Salpingostomy): Required for every ruptured ectopic pregnancy, any patient with hemodynamic instability, free peritoneal blood, severe pain, or a fetal heartbeat inside the fallopian tube. Surgeons remove the ruptured fallopian tube (salpingectomy) or open the tube to remove the pregnancy (salpingostomy) and transfuse O-negative or crossmatched blood. (Having one fallopian tube removed still leaves 70 to 85 percent of normal natural fertility via the remaining healthy tube).
5. Medical Management with Intramuscular Methotrexate (Only for Stable, Unruptured Ectopics): If an ectopic pregnancy is caught early before it ruptures, and the patient is completely stable with minimal pain and a small unruptured mass, doctors can often avoid surgery by giving an intramuscular injection of methotrexate (a folate antagonist that stops rapidly dividing placental cells so the body safely reabsorbs the pregnancy over 2 to 6 weeks). Critical post-methotrexate warning: Even after receiving a methotrexate shot, the fallopian tube remains fragile and can still rupture 3 to 14 days later; if a patient who received methotrexate develops sudden severe abdominal pain, shoulder-tip pain, or dizziness at home, call 911 / 112 / 999 immediately.

Rare non-tubal ectopic locations that rupture with catastrophic bleeding¶

While 95 to 97 percent of ectopic pregnancies implant in the main ampulla or isthmus of the fallopian tube, about 3 to 5 percent implant in unusual anatomical sites where diagnosis is harder and internal hemorrhage can be even more violent:

• Interstitial (Cornual) Ectopic Pregnancy (2% to 4% of ectopics): Implants in the proximal segment of the fallopian tube that tunnels directly through the thick muscular wall of the uterus, right where the uterine and ovarian arteries anastomose. Because the surrounding uterine muscle is thicker than the outer fallopian tube, an interstitial pregnancy can grow until 8 to 14 weeks of gestation before suddenly exploding through the uterine horn, causing rapid exsanguination with a mortality rate up to 2 to 5 times higher than standard tubal pregnancies.
• Cesarean Scar Pregnancy (CSP): Implants directly into the microscopic fibrous defect (niche) of a prior lower-segment cesarean section scar. As the placenta burrows through the thin scar toward the urinary bladder, it can cause catastrophic first- or second-trimester uterine rupture or placenta accreta spectrum hemorrhage.
• Cervical, Ovarian, and Abdominal Ectopic Pregnancies: Implantation inside the endocervical canal (causing torrential painless vaginal hemorrhage), on the surface of the ovary, or directly onto the peritoneal lining or bowel serosa inside the abdominal cavity.

Câu hỏi thường gặp¶

Đã kiểm tra nguồn¶

• American College of Obstetricians and Gynecologists (ACOG, United States): Practice Bulletin No. 193: Tubal Ectopic Pregnancy and Practice Bulletin No. 200: Early Pregnancy Loss.
• National Institute for Health and Care Excellence (NICE, United Kingdom) and Royal College of Obstetricians and Gynaecologists (RCOG, United Kingdom): Ectopic Pregnancy and Miscarriage: Diagnosis and Initial Management (NG126, updated 2023) and Green-top Guideline No. 21: Diagnosis and Management of Ectopic Pregnancy.
• Society of Obstetricians and Gynaecologists of Canada (SOGC, Canada): Clinical Practice Guideline No. 414: Management of Pregnancy of Unknown Location and Tubal and Non-Tubal Ectopic Pregnancies.
• World Health Organization (WHO): Managing Complications in Pregnancy and Childbirth: Vaginal Bleeding in Early Pregnancy and Ruptured Ectopic Pregnancy Surgical Protocols.

Hướng dẫn liên quan¶

• Nhận biết sốc và quản lý sơ cứu
• Testicular torsion, ovarian torsion, and acute pelvic pain
• Sinh con khẩn cấp và chuyển dạ nhanh chóng
• Đánh giá ngất xỉu và ngất
• Số khẩn cấp và công văn quốc tế