An established 37-year-old patient visits the outpatient clinic requesting a new birth con… — USMLE Step 2 CK

An established $37$ -year-old patient visits the outpatient clinic requesting a new birth control strategy. Over the last $9$ months, she has experienced increasingly heavy menstrual bleeding, often soaking through her clothes and requiring her to take days off work. She previously relied on condoms but desires a highly effective, long-acting method. Her medical background is significant for recurrent right-sided headaches that are preceded by visual bright spots, for which she occasionally takes sumatriptan. She currently consumes one pack of cigarettes per day. Vital signs include a blood pressure of $122/78$ mm Hg, a heart rate of $76$ /min, and a body mass index (BMI) of $23$ kg/m $^2$ . General physical and pelvic examinations are unremarkable. A urine human chorionic gonadotropin test is negative.

Laboratory studies reveal:
Hemoglobin: $10.5$ g/dL
Thyroid-stimulating hormone: $2.1$ mIU/L
Prolactin: $14$ ng/mL

The patient firmly declines any permanent surgical interventions. Which of the following is the most appropriate next step in the management of this patient?

A
Recommend a copper-bearing intrauterine device
B
Provide an ethinyl estradiol and etonogestrel vaginal ring
C
Perform an outpatient endometrial tissue biopsy
D
Assess serum free testosterone and dehydroepiandrosterone sulfate
Insert a levonorgestrel-eluting intrauterine systemAnswer

Answer

The most appropriate next step is to insert a levonorgestrel-eluting intrauterine system, as it provides safe contraception without estrogen and effectively treats heavy menstrual bleeding.

The correct management is the insertion of a levonorgestrel-eluting intrauterine system (LNG-IUS). This patient requires highly effective contraception but possesses two absolute contraindications (WHO MEC category 4) to estrogen-containing methods: a history of migraine with aura (high ischemic stroke risk) and being a smoker aged 35 or older (high myocardial infarction and venous thromboembolism risk). Thus, combined oral pills, patches, and vaginal rings are strictly contraindicated. She also requires treatment for heavy menstrual bleeding. The LNG-IUS is a progestin-only method that is safe for her risk profile (MEC category 1 and 2). It releases levonorgestrel locally, which profoundly thins the endometrial lining, making it an excellent first-line medical therapy for heavy menstrual bleeding.

Step-by-Step Solution

Evaluate the patient's medical history for contraceptive contraindications using WHO Medical Eligibility Criteria.

The patient has migraine with aura and is a smoker over the age of

35

Both of these conditions are WHO MEC category 4 (absolute contraindications) for any combined hormonal contraceptives (CHCs) due to an unacceptably high risk of ischemic stroke and myocardial infarction.

Analyze the nature of the patient's primary gynecologic complaint.

The patient suffers from heavy menstrual bleeding resulting in mild anemia (Hemoglobin

10.5

g/dL).

Identifying the bleeding pattern is crucial because certain non-hormonal methods, specifically the copper intrauterine device, can exacerbate endometrial blood loss.

Determine if structural or malignant evaluation is immediately required.

Endometrial biopsy is deferred.

The patient is under

45

years old, has a normal BMI (

23

kg/m

^2

), and lacks risk factors for unopposed estrogen exposure (like PCOS), making an endometrial biopsy unnecessary prior to initiating medical management.

Select the optimal therapeutic method that addresses both family planning and symptom management.

The levonorgestrel-eluting intrauterine system (LNG-IUS) is selected.

The LNG-IUS provides highly effective, long-acting contraception, is estrogen-free (safe for her cardiovascular risk profile), and acts locally to thin the endometrium, directly treating her heavy menstrual bleeding.

Key Concept

WHO Medical Eligibility Criteria (MEC) for contraception and the dual management of family planning and heavy menstrual bleeding in high-risk cardiovascular patients.

Estimated Time:1m 30s

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