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Difficulty: Very hardObstetric Complications

Following a spontaneous vaginal delivery of a 4150 g4150\text{ g} neonate, a 2828-year-old multiparous patient develops sudden, massive vaginal hemorrhage. The delivery was complicated by a prolonged second stage. During the third stage of labor, strong umbilical cord traction was applied prior to spontaneous placental separation. The patient now reports severe, agonizing lower abdominal pain and severe lightheadedness. Vital signs show a blood pressure of 76/40 mmHg76/40\text{ mmHg} and a heart rate of 142/min142/\text{min}. Pelvic examination reveals a firm, smooth, beefy-red mass completely filling the vaginal vault, with the placenta still densely attached to its surface. Abdominal palpation fails to identify a uterine fundus in the pelvis. An initial bedside attempt by the physician to manually push the mass cephalad is thwarted by a tightly contracted lower cervical ring. Massive transfusion protocol is activated. Arrange the following subsequent critical management steps in the correct chronological order.

  1. 1Discontinue any ongoing uterotonic infusions
  2. 2Administer a rapid-acting intravenous uterine relaxant
  3. 3Manually replace the uterine fundus into its normal anatomic position
  4. 4Initiate a continuous uterotonic infusion
  5. 5Perform manual extraction of the adherent placenta

Answer

The correct sequence for managing a refractory uterine inversion is to first halt any uterotonics, administer a uterine relaxant, manually replace the fundus, restart uterotonics to establish tone, and finally remove the adherent placenta.
The precise chronological protocol for a refractory uterine inversion prioritizes restoring normal anatomy before addressing the third stage of labor. Because the uterus is clamped down, all uterotonics must be stopped, and a relaxant (like nitroglycerin) must be administered. Once relaxed, the uterus is pushed back into place. Only then are uterotonics given to firm up the tissue, and finally, the placenta is removed from a now-contracted, normally positioned uterus to minimize blood loss.

Step-by-Step Solution

1
Recognize the diagnosis of uterine inversion complicated by a contracted cervical ring.
Identify that the primary mechanical barrier to repositioning is myometrial contraction.
The initial manual attempt failed, indicating that the lower uterine segment has clamped down around the inverted fundus.
2
Discontinue offending agents and administer a uterine relaxant.
The cervical ring loosens.
Pushing against a contracted ring is futile and risks tissue damage; stopping oxytocin and giving nitroglycerin relaxes the smooth muscle.
3
Perform manual replacement followed immediately by uterotonics.
Normal uterine anatomy and tone are restored.
The uterus must be held in place while uterotonics take effect to prevent it from immediately reinverting due to gravity and residual relaxation.
4
Manually extract the placenta as the final step.
The third stage of labor is safely completed with minimal blood loss.
Delaying placental removal ensures the myometrium can immediately contract around the spiral arteries once the placenta is detached.

Key Concept

Sequential management of uterine inversion requires achieving uterine relaxation for replacement, followed by restoring uterine tone, and strictly delaying placental removal until normal anatomy and firm tone are established to prevent fatal hemorrhage.
Estimated Time:2m 0s
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Topics

Obstetric Complications

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