Osler Round 2 - 25/F at 32 weeks of gestation with severe headache: Case Discussion

This case discussion focuses on the rapid identification, risk stratification, and emergency management of preeclampsia with severe features (PECSF) complicated by suspected placental abruption in a preterm gestation. Learners will master the clinical decision thresholds for seizure prophylaxis, acute antihypertensive therapy, and the indications for expedited delivery in low-resource settings.

The primary pathophysiology of preeclampsia involves abnormal cytotrophoblast invasion of the uterine spiral arteries, leading to failed vascular remodeling, placental ischemia, and the systemic release of anti-angiogenic factors (such as sFlt-1) [R4, R5]. This results in widespread maternal endothelial dysfunction and intense vasospasm. End-organ manifestations in this patient include: glomerular endotheliosis causing significant proteinuria (2+); hepatic sinusoidal fibrin deposition and edema stretching Glisson's capsule, presenting as epigastric pain; and cerebral vasospasm or microvascular edema causing severe headache and blurred vision [R4, R8].

Key positive findings include severe neurological symptoms (headache, blurred vision), epigastric pain, mild vaginal bleeding, abdominal tenderness, severe hypertension (160/100 mmHg), maternal tachycardia (110 bpm), and tachypnea (24 breaths per minute). Key negatives include the absence of tonic-clonic seizures (ruling out eclampsia at presentation) and the absence of chest pain or dyspnea (lowering the likelihood of acute pulmonary edema or pulmonary embolism [L10]). Red flags include the combination of vaginal bleeding and abdominal tenderness (highly suggestive of placental abruption) and severe epigastric pain (warning of impending hepatic rupture or HELLP syndrome) [R4, R8]. Critical missing safety data includes a coagulation profile (INR, PTT, fibrinogen) to assess for disseminated intravascular coagulation (DIC) secondary to abruption, and continuous cardiotocography (CTG) to fully characterize fetal status.

Bedside evaluation must include an immediate urinalysis to confirm significant proteinuria (2+) and a bedside obstetric ultrasound to assess fetal viability, presentation, amniotic fluid volume, and to rule out a retroplacental hematoma (noting that ultrasound has low sensitivity for abruption) [R4]. Laboratory investigations must include a Complete Blood Count (patient had anemia with Hb 10.5 g/dL and thrombocytopenia with platelets 100,000/μL), Liver Function Tests (revealing transaminitis with AST 50 U/L and ALT 60 U/L), and renal function tests (creatinine, uric acid). Fetal heart rate monitoring is essential; while the noted baseline of 140 bpm is normal, continuous or frequent monitoring is required to detect late decelerations, bradycardia, or loss of variability, which signify fetal distress in the context of placental abruption [R4].

The definitive treatment for preeclampsia with severe features is delivery [R4]. At 32 weeks gestation, in the presence of severe features and suspected placental abruption (vaginal bleeding and uterine tenderness), delivery should not be delayed once the mother is stabilized [R4, R6]. Delivery should be expedited via induction of labor if vaginal delivery is imminent and fetal status is reassuring, or via emergency Caesarean section if there is fetal distress, severe abruption, or unfavorable cervix [R4]. Continue maintenance Magnesium sulfate (5g IM every 4 hours in alternating buttocks, or 1g/hour IV infusion) for 24 hours postpartum or 24 hours after the last seizure [R1]. Transition to oral antihypertensives such as oral Nifedipine (calcium channel blocker) 10-20mg 8-12 hourly or Methyldopa [R1]. Avoid ACE inhibitors like enalapril due to severe fetal renal toxicity [R4]. Restrict total fluid intake to 80 mL/hour (or 1 mL/kg/hour) to prevent fluid overload and pulmonary edema [R1, R4].

- Preeclampsia with severe features (PECSF) is diagnosed in a pregnant patient (>20 weeks) with hypertension and any severe end-organ feature, regardless of the presence or absence of proteinuria [R4, R6].
- Epigastric or right upper quadrant pain in preeclampsia is a critical warning sign reflecting hepatic swelling and stretching of Glisson's capsule, which can precede hepatic rupture or HELLP syndrome [R4, R8].
- Magnesium sulfate is the superior agent for both preventing eclamptic seizures in PECSF and controlling seizures in established eclampsia [R1, R7].
- Severe acute hypertension (BP ≥160/110 mmHg) in pregnancy is an obstetric emergency that requires prompt, controlled reduction with IV hydralazine or labetalol to prevent maternal hemorrhagic stroke [R1, R4].
- A history of early pregnancy loss (miscarriage) is associated with an increased risk of subsequent preeclampsia, highlighting shared underlying vascular and placental etiologies [R5].