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Difficulty: Very hardObstetric Complications

While waiting in the obstetric triage area, a primigravida at 3838 weeks of gestation abruptly loses consciousness and exhibits generalized tonic-clonic motor activity. Moments prior to this event, she had complained of a severe, unrelenting headache and seeing 'flashing lights'. Her last recorded blood pressure, taken ten minutes earlier, was 185/115 mmHg185/115\text{ mmHg}. During the convulsion, the continuous external fetal monitor records a sudden, prolonged drop in the fetal heart rate to 65/min65\text{/min}.

Arrange the following critical management steps in the correct chronological sequence to appropriately address this acute emergency.

  1. 1Position the patient in the left lateral decubitus position and ensure airway patency.
  2. 2Administer an intravenous loading dose of magnesium sulfate.
  3. 3Administer an intravenous antihypertensive agent such as labetalol or hydralazine.
  4. 4Continue monitoring to allow for in utero fetal resuscitation and heart rate recovery.
  5. 5Proceed with definitive expedited delivery.

Answer

The correct sequence is: 1) Position the patient laterally and ensure airway patency, 2) Administer intravenous magnesium sulfate, 3) Administer intravenous antihypertensives, 4) Allow for in utero fetal resuscitation, and 5) Proceed with expedited delivery.
The correct sequence prioritizes maternal stabilization over immediate fetal rescue. Eclamptic seizures cause maternal hypoxia and intense uterine vasospasm, leading to a transient fetal bradycardia. Securing the maternal airway and positioning (Step 1) prevents aspiration. Administering magnesium sulfate (Step 2) arrests the seizure, halting the hypoxic insult. Controlling the severe hypertension (Step 3) prevents hemorrhagic stroke. Once the mother is stabilized, the fetal heart rate typically recovers spontaneously (Step 4), allowing for a safer, expedited delivery (Step 5).

Step-by-Step Solution

1
Address maternal airway, breathing, and circulation (ABC).
Patient is placed in the left lateral decubitus position with the airway protected.
Basic life support is the universal first step to prevent aspiration and hypoxia in any unconscious or seizing patient.
2
Arrest the seizure activity.
Intravenous magnesium sulfate is administered.
Magnesium sulfate is the superior agent for treating eclamptic seizures, directly addressing the acute neurological emergency.
3
Control severe maternal hypertension.
Intravenous labetalol or hydralazine is administered.
Preventing maternal hemorrhagic stroke by lowering the blood pressure to a safe range is critical once the active convulsion is managed.
4
Assess fetal response to maternal resuscitation.
Continuous monitoring reveals in utero resuscitation as the fetal heart rate recovers.
Severe fetal bradycardia is a physiological response to maternal hypoxia and seizure-induced uterine hypertonus; operating on an unstable mother is absolutely contraindicated.
5
Perform definitive management.
The patient proceeds to expedited delivery.
Eclampsia is an absolute indication for delivery, which cures the underlying pathophysiology, but it must only be performed on a stabilized patient.

Key Concept

In the management of eclampsia complicated by fetal bradycardia, maternal stabilization (airway protection, magnesium sulfate administration, and blood pressure control) strictly precedes fetal rescue and delivery.
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Topics

Obstetric Complications

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