Drug of choice for induction of ovulation?

ESIC Nursing Officer 2016 (Shift -2)

Obstetrics & Gynaecology

Easy

Appeared in: ESIC Nursing Officer 2016 (Shift -2)

Explanation

Clomiphene citrate is the initial and most common treatment for anovulatory infertility.
It acts as a Selective Estrogen Receptor Modulator (SERM), blocking estrogen receptors in the hypothalamus.
This action disrupts the normal negative feedback, causing an increase in GnRH, which in turn boosts FSH and LH secretion.
The elevated FSH levels stimulate ovarian follicular growth, leading to ovulation.

Option B: Administering estrogen would suppress FSH secretion from the pituitary gland through negative feedback, thereby inhibiting rather than inducing ovulation.
Option C: Metformin is an insulin-sensitizing agent, not a primary ovulation induction drug. Its main role is to manage insulin resistance in conditions like PCOS.
Option D: Progesterone's primary role is to prepare the endometrium for implantation after ovulation and to support the luteal phase. It does not trigger ovulation.

Visual 1: Diagram - An illustration of the Hypothalamic-Pituitary-Ovarian (HPO) axis, highlighting how Clomiphene blocks estrogen receptors at the hypothalamus, leading to increased FSH/LH release and subsequent ovulation.
Visual 2: Flowchart - A step-by-step flowchart showing the process of a Clomiphene cycle, from initial dosing on day 2-5, to expected ovulation 5-10 days after the last dose, and the window for timed intercourse.

Clinical Relevance

Nursing practice connection: Knowing Pharmacological Induction of Ovulation helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses play a key role in educating patients about Clomiphene therapy, including the correct administration schedule, potential side effects, and the importance of timed intercourse.
A critical patient safety instruction is to report any visual disturbances (blurred vision, spots, flashing lights) immediately, as this can be a rare but serious side effect requiring discontinuation of the drug.
Patient counseling must include the increased risk of multiple gestation (twins, triplets), which occurs in about 5-10% of pregnancies conceived with Clomiphene.

How to Approach the Question

Identify the core question: The question asks for the 'drug of choice' for a specific purpose, 'induction of ovulation'.
This is a factual recall question based on standard pharmacological treatment protocols in reproductive endocrinology.
Analyze the options based on their primary mechanism of action in the female reproductive cycle.
Recall that Clomiphene is a SERM specifically designed to stimulate the HPO axis to trigger ovulation.
Eliminate other hormones based on their known roles: Estrogen (suppresses ovulation), Progesterone (supports pregnancy post-ovulation), and Metformin (an adjuvant for metabolic issues in PCOS).

Concept Tested & Keywords

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