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Difficulty: MediumPreventive Care and Screening

A 31-year-old woman, gravida 1, para 0, presents to the clinic for a routine prenatal visit at 13 weeks of gestation. She has a medical history of chronic hypertension that is currently well controlled. She has never smoked and consumes no alcohol. Her daily medication is nifedipine. Vital signs today demonstrate a blood pressure of 126/82 mm Hg126/82 \text{ mm Hg}, a heart rate of 78/min, and a body mass index of 28 kg/m228 \text{ kg/m}^2. A urine dipstick is negative for protein. Fetal heart tones are audible via Doppler ultrasound. Which of the following is the most appropriate preventive intervention to add to this patient's management plan at this time?

  1. Initiate low-dose aspirin therapyAnswer
  2. B
    Initiate prophylactic low-molecular-weight heparin
  3. C
    Switch nifedipine to lisinopril
  4. D
    Recommend strict bed rest
  5. E
    Initiate high-dose vitamin C and E supplementation

Answer

Initiate low-dose aspirin therapy
The correct intervention is to initiate low-dose aspirin therapy. This patient has chronic hypertension, which places her at high risk for developing preeclampsia during pregnancy. The United States Preventive Services Task Force (USPSTF) and the American College of Obstetricians and Gynecologists (ACOG) strongly recommend low-dose aspirin (81 mg/day) prophylaxis starting between 12 and 28 weeks of gestation (optimally before 16 weeks) for women with one or more high-risk factors for preeclampsia. High-risk factors include a history of preeclampsia, multifetal gestation, chronic hypertension, type 1 or 2 diabetes mellitus, renal disease, and autoimmune diseases (such as systemic lupus erythematosus or antiphospholipid syndrome).

Step-by-Step Solution

1
Identify the patient's existing risk factors for obstetric complications.
The patient is nulliparous and has a history of chronic hypertension.
Accurate risk stratification is necessary to determine if targeted preventive measures are indicated during pregnancy.
2
Determine the appropriate preventive guideline for this specific risk profile.
According to the USPSTF, chronic hypertension is designated as a high-risk factor for the development of preeclampsia.
High-risk patients require evidence-based pharmacologic prophylaxis to reduce maternal and fetal morbidity associated with preeclampsia.
3
Select the correct intervention and its appropriate timing.
Low-dose aspirin is recommended to be started after 12 weeks of gestation.
Clinical evidence demonstrates that aspirin safely reduces the incidence of preeclampsia and adverse perinatal outcomes in high-risk populations.

Key Concept

The USPSTF recommends prescribing low-dose aspirin (81 mg/day) as preventive medication after 12 weeks of gestation in pregnant individuals who are at high risk for preeclampsia (e.g., those with chronic hypertension, type 1 or 2 diabetes, or prior preeclampsia).

Alternative Method

Risk assessment for aspirin prophylaxis can also be performed by reviewing moderate risk factors (e.g., nulliparity, obesity with BMI > 30, advanced maternal age > 35, family history of preeclampsia). The presence of multiple moderate risk factors also warrants low-dose aspirin prophylaxis.
Estimated Time:1m 0s
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Topics

Preventive Care and Screening

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