ATI/ OB | Hypertensive Complications

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Hypertensive disorders are a leading cause of maternal and fetal morbidity and mortality worldwide. The underlying pathophysiology of these conditions stems from poor placental trophoblast invasion and inadequate uterine spiral artery remodeling during early pregnancy. This structural failure causes placental hypoxia, which triggers a systemic inflammatory cascade leading to widespread maternal endothelial dysfunction, vasoconstriction, and subsequent end-organ damage.

• Chronic Hypertension: Blood pressure (BP) greater than or equal to 140/90 mm Hg identified prior to 20 weeks of gestation.
• Gestational Hypertension: New-onset BP greater than or equal to 140/90 mm Hg occurring after 20 weeks of gestation, without the presence of proteinuria.
• Preeclampsia: Diagnosed when hypertension occurs after 20 weeks alongside systemic end-organ damage, with or without proteinuria. It is subdivided into preeclampsia without severe features and preeclampsia with severe features (BP ≥ 160/110 mm Hg, central nervous system dysfunction, pulmonary edema, or altered liver function).
• Eclampsia: A severe obstetrical emergency characterized by new-onset tonic-clonic seizures that can rapidly cause maternal hypoxia, placental abruption, and fetal or maternal death.
• HELLP Syndrome: A life-threatening variant involving Hemolysis, Elevated Liver enzymes, and Low Platelets.

Key Clinical Manifestations and Monitoring Because these disorders can deteriorate rapidly, recognizing the warning signs is the most vital nursing intervention. Manifestations of worsening disease include severe and unresolved headaches, visual disturbances, right upper quadrant or epigastric abdominal pain, pulmonary edema, and sudden weight gain. Accurate BP measurement using the correct cuff size with the client seated for 10 minutes is critical. Diagnostic laboratory monitoring focuses on falling platelet counts (< 100,000/mm3), rising AST/ALT liver enzymes, elevated serum creatinine (≥ 1.1 mg/dL), and proteinuria (≥ 300 mg in a 24-hour urine test).

Core Treatments and Therapies

• Antihypertensives: First-line oral medications for maintenance include methyldopa, labetalol, and nifedipine. For acute severe hypertension (BP ≥ 160/110), IV labetalol or IV hydralazine is rapidly administered. ACE inhibitors and ARBs are strictly contraindicated in pregnancy due to the high risk of fetal anomalies. Low-dose aspirin (81 mg) is highly recommended as a preventative measure for at-risk clients.
• Seizure Prophylaxis: Intravenous Magnesium Sulfate is the gold standard medication for preventing and treating eclamptic seizures. Because it is a potent central nervous system depressant, nurses must vigilantly monitor for magnesium toxicity, marked by loss of deep tendon reflexes, respiratory depression, and oliguria. Calcium gluconate must be readily available as the antidote. A low-stimulation environment and an indwelling catheter for strict intake/output are required.
• Fetal Protection: Antenatal corticosteroids, such as betamethasone, are administered to accelerate fetal lung surfactant production if a premature birth is anticipated. Fetal status is closely monitored via frequent ultrasounds and nonstress tests due to the high risk of fetal growth restriction and hypoxia.