Examkin

Question

Difficulty: EasyReproductive Endocrinology and Infertility

A 29-year-old nulligravid woman with a BMI of 34 kg/m² comes to the clinic seeking evaluation for an inability to conceive over the past 14 months. She has a history of irregular menstrual cycles occurring every 45 to 60 days. Physical examination reveals moderate facial acne and terminal hair growth on her chin. Semen analysis of her partner is within normal limits, and a hysterosalpingogram demonstrates patent fallopian tubes bilaterally. Arrange the following management steps in the correct chronological sequence for this patient's anovulatory infertility, progressing from the most appropriate initial therapy to the most advanced intervention.

  1. 1Implementation of a diet and exercise program for weight reduction
  2. 2Oral administration of letrozole
  3. 3Daily injections of exogenous gonadotropins
  4. 4In vitro fertilization (IVF)

Answer

The correct sequence of treatment for anovulatory infertility in an obese patient with PCOS begins with weight loss, followed by letrozole, then exogenous gonadotropins, and finally in vitro fertilization.
The patient's presentation of infrequent menses, clinical hyperandrogenism (hirsutism, acne), and infertility in the setting of obesity is diagnostic of polycystic ovary syndrome (PCOS). Since her partner's semen analysis and her fallopian tubes are normal, the primary issue is anovulation. The treatment of PCOS-related infertility follows a strict stepwise escalation. The initial step for overweight or obese patients is lifestyle modification and weight loss, which decreases peripheral estrone conversion and insulin resistance, often restoring spontaneous ovulation. If this is unsuccessful, the first-line pharmacologic agent is letrozole, an aromatase inhibitor. If ovulation or pregnancy is not achieved after multiple cycles of letrozole, exogenous gonadotropins (FSH/LH) are utilized to directly stimulate the ovaries. In vitro fertilization (IVF) is the final, most invasive step if all other conservative and pharmacological methods fail.

Step-by-Step Solution

1
Identify the underlying cause of the patient's infertility.
The patient has oligomenorrhea and clinical hyperandrogenism in the setting of obesity, which is consistent with polycystic ovary syndrome (PCOS).
Establishing the etiology of infertility directs the specific stepwise treatment algorithm.
2
Determine the initial, least invasive therapeutic intervention.
Implementation of a diet and exercise program for weight reduction.
In obese patients with PCOS, weight loss is considered first-line management because it decreases insulin resistance and can independently restore ovulatory cycles.
3
Select the first-line pharmacologic therapy if lifestyle modifications fail.
Oral administration of letrozole.
Current guidelines recommend letrozole (an aromatase inhibitor) as the preferred first-line ovulation induction agent for PCOS due to higher live birth rates compared to clomiphene.
4
Identify subsequent steps for treatment resistance.
Exogenous gonadotropins, followed by in vitro fertilization (IVF).
Therapy logically escalates from oral agents to injectable medications (gonadotropins), and ultimately to assisted reproductive technologies (IVF) as a last resort.

Key Concept

Stepwise management of infertility in polycystic ovary syndrome (PCOS)
Estimated Time:1m 0s
Rate this question

Topics

Reproductive Endocrinology and Infertility

More questions from this topic