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Zorluk: ZorLabor, Delivery, and Puerperium

A 32-year-old gravida 3, para 2 woman at 38 weeks gestation is admitted to the labor and delivery unit. She reports that her "water broke" an hour ago at home, followed immediately by a moderate amount of bright red vaginal bleeding. She denies any uterine contractions or abdominal pain. Her two previous deliveries were by cesarean section. Her blood pressure is 110/70 mm Hg, and her pulse is 88/min. The fetal heart rate tracing demonstrates a baseline of 140/min with a smooth, undulating, sine-wave-like pattern oscillating with an amplitude of 15 beats per minute at a frequency of 4 cycles per minute. There is no beat-to-beat variability, and no accelerations or decelerations are noted. The uterus is soft and non-tender on palpation. Which of the following is the most appropriate next step in management?

  1. Emergent cesarean deliveryCevap
  2. B
    Maternal repositioning and intravenous fluid bolus
  3. C
    Transvaginal ultrasonography
  4. D
    Kleihauer-Betke testing
  5. E
    Amnioinfusion

Cevap

The most appropriate next step in management is emergent cesarean delivery.
The correct answer is emergent cesarean delivery. The clinical presentation of painless vaginal bleeding immediately following spontaneous rupture of membranes, combined with a history of prior cesarean deliveries, is highly suspicious for a ruptured vasa previa. The fetal heart rate tracing described—a smooth, undulating wave with a frequency of 3-5 cycles per minute and absent beat-to-beat variability—is a sinusoidal pattern. A sinusoidal pattern is a Category III fetal heart rate tracing that specifically indicates severe fetal anemia or hypoxia. In this context, the torn fetal vessels from the vasa previa are causing rapid fetal exsanguination. Therefore, the most appropriate and life-saving next step is an emergent cesarean delivery to prevent fetal demise.

Adım Adım Çözüm

1
Analyze the patient's clinical presentation.
The history of prior cesareans and painless vaginal bleeding immediately following spontaneous rupture of membranes is highly suspicious for a ruptured vasa previa.
Prior uterine surgeries increase the risk of abnormal placentation, and painless bleeding upon amniotomy is the classic presentation of torn fetal vessels.
2
Interpret the fetal heart rate tracing description.
The tracing describes a sinusoidal pattern, which is classified as a Category III tracing.
A smooth, undulating sine-wave pattern with absent beat-to-beat variability and a frequency of 3-5 cycles per minute is the hallmark of a sinusoidal tracing, indicating severe fetal anemia or hypoxia.
3
Determine the appropriate management based on the diagnosis and tracing.
Emergent cesarean delivery must be performed immediately.
A ruptured vasa previa leads to rapid fetal exsanguination (as evidenced by the sinusoidal pattern). Any delay for further diagnostics or conservative resuscitation will likely result in fetal demise.

Anahtar Kavram

A sinusoidal fetal heart rate pattern in the setting of painless vaginal bleeding after membrane rupture indicates ruptured vasa previa and severe fetal anemia, necessitating emergent cesarean delivery.
Tahmini Süre:1m 30s
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Konular

Labor, Delivery, and Puerperium

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