A pregnant client at 32 weeks gestation is admitted with severe preeclampsia. Her blood pressure is 160/110 mmHg, and she has 3+ proteinuria. Which nursing intervention should be implemented first?

The priority intervention is placing the client in a quiet, dimly lit room to reduce stimuli and prevent eclamptic seizures. Other interventions like antihypertensive administration or cesarean preparation are important but secondary to immediate seizure prevention.

Understanding the Priority: Seizure Prophylaxis in Severe Preeclampsia

The client's presentation—32 weeks gestation, blood pressure of 160/110 mmHg, and 3+ proteinuria—meets the diagnostic criteria for severe preeclampsia. In this clinical scenario, the immediate threat to both maternal and fetal well-being is the progression from severe preeclampsia to eclampsia, which is characterized by the onset of generalized tonic-clonic seizures. Therefore, the highest priority nursing intervention is one that directly reduces the risk of seizure activity by controlling the central nervous system (CNS) environment.

Why CNS Protection is the First Priority

The pathophysiology of eclampsia is related to cerebral vasospasm, endothelial dysfunction, and increased CNS irritability, rather than simply the degree of hypertension alone. While the blood pressure of 160/110 mmHg requires urgent management to prevent maternal end-organ damage such as intracranial hemorrhage, the immediate risk of a seizure can be triggered by sensory stimuli. Placing the client in a quiet, dimly lit room is a critical non-pharmacologic intervention that minimizes external stimuli (e.g., loud noises, bright lights, excessive handling), thereby decreasing neuronal excitability. This environmental control is a cornerstone of seizure prophylaxis and is the one intervention the nurse can implement instantly and independently without a provider's order.

Analyzing the Other Options

- Option 1: Administer antihypertensive medication as ordered. While controlling blood pressure is a core component of managing severe preeclampsia, as highlighted by the principles in the 2024 Thai Guidelines on the treatment of hypertension which define the risk thresholds for end-organ damage, this is not the first action. The nurse must first ensure the environment is safe to prevent a seizure, which could be provoked during the administration of the medication. Furthermore, the primary goal of acute antihypertensive therapy is to prevent maternal stroke over hours, whereas a seizure can occur in moments.
- Option 3: Prepare for immediate cesarean delivery. Delivery is the only definitive cure for preeclampsia. However, at 32 weeks gestation, unless there is an immediate life-threatening indication that cannot be stabilized (such as a placental abruption or a non-reassuring fetal status that is not mentioned here), the priority is to stabilize the mother first. This includes initiating seizure prophylaxis and controlling blood pressure. Performing a cesarean delivery on an unstable, hyper-reflexic patient dramatically increases the risk of intraoperative eclampsia.
- Option 4: Insert an indwelling urinary catheter. Monitoring urine output is essential for assessing renal function and fluid balance in severe preeclampsia, as proteinuria indicates glomerular endotheliosis. However, the procedure of catheter insertion is a tactile and potentially painful stimulus that can provoke a seizure in a patient with severe CNS irritability. This intervention should be performed after the patient is sedated, calm, and ideally after seizure prophylaxis (e.g., magnesium sulfate) has been initiated and the environment is controlled.

The nurse's immediate action is to create a neuroprotective environment. This intervention directly addresses the most imminent danger—eclamptic seizure—by reducing the sensory input that can trigger it, making it the correct first step in the nursing management cascade.