A 28-year-old woman presents with 6 weeks of amenorrhea, lower abdominal pain, and vaginal spotting. Transvaginal ultrasound shows an empty uterus and the structure marked **A** in the diagram—a dilated, hemorrhagic segment of the fallopian tube. Serum β-hCG is 4200 mIU/mL. Which of the following is the MOST appropriate next step in management?
A. Emergency laparotomy with salpingectomy and hysterectomy
B. Intramuscular methotrexate 50 mg/m² as single-dose medical therapy
C. Expectant management with serial β-hCG monitoring every 48 hours
D. Emergency laparoscopic salpingostomy with tube conservation
Explanation
Why Emergency laparoscopic salpingostomy with tube conservation is right
The patient presents with a hemodynamically stable ectopic pregnancy (EP) localized to the ampullary segment (structure A, the hematosalpinx). The β-hCG of 4200 mIU/mL is above the discriminatory zone (~3500 mIU/mL), confirming EP. However, the clinical presentation—pain and spotting—and the imaging finding of a dilated hemorrhagic ampullary segment suggest imminent or early rupture risk. According to ACOG Practice Bulletin No. 193 and RCOG Green-top 21, the ampulla is the most common site of tubal EP (70% of all tubal pregnancies) and is at higher rupture risk due to its distensibility. While medical management with methotrexate is an option for stable patients with EP < 3.5 cm and β-hCG < 5000 mIU/mL, the presence of a visibly dilated hemorrhagic segment (hematosalpinx) indicates structural compromise and hemodynamic concern. Surgical intervention via laparoscopic salpingostomy is indicated to prevent rupture and preserve tubal function, particularly important given the patient's age and future fertility. Salpingostomy (linear incision, tube-sparing) is preferred over salpingectomy when the contralateral tube is unaffected (as shown by structure D).
Why each distractor is wrong
Expectant management with serial β-hCG monitoring every 48 hours: Expectant management is reserved for selected stable patients with declining β-hCG < 1000–2000 mIU/mL. This patient's β-hCG is 4200 mIU/mL (rising/high), and the presence of a dilated hemorrhagic ampullary segment indicates imminent rupture risk, making expectant management unsafe.
Intramuscular methotrexate 50 mg/m² as single-dose medical therapy: Medical management is appropriate for hemodynamically stable EP < 3.5 cm with β-hCG < 5000 mIU/mL and no fetal cardiac activity. However, the imaging finding of a visibly dilated, hemorrhagic ampullary segment (hematosalpinx) suggests structural compromise and rupture risk beyond the size criterion alone. The presence of hemorrhage within the tube indicates active bleeding and tissue damage, necessitating surgical intervention rather than medical management.
Emergency laparotomy with salpingectomy and hysterectomy: Laparotomy is reserved for hemodynamically unstable patients or those with extensive adhesions. This patient is hemodynamically stable. Hysterectomy is not indicated for EP management; salpingectomy alone may be considered if the contralateral tube is damaged, but structure D shows an unaffected isthmic tube, making tube-sparing salpingostomy the preferred approach.
High-YieldNEET PG
The ampulla (structure A) is the most common site of tubal EP (70%); a dilated hemorrhagic ampullary segment (hematosalpinx) indicates rupture risk and warrants surgical intervention via laparoscopic salpingostomy to preserve fertility.
ACOG Practice Bulletin No. 193; RCOG Green-top Guideline 21
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