Menstrual Disorders — MCQs

Menstrual Disorders Indian Medical PG Practice Questions and MCQs

Question 61: A 25-year-old female developed secondary amenorrhea of 6 months' duration. Even after administration of estrogen and progesterone for two weeks, there was no vaginal bleeding. The underlying cause could be in the:

A. Pituitary gland
B. Hypothalamus
C. Uterus (Correct Answer)
D. Ovary

Explanation: This question tests your understanding of the **Step-wise Evaluation of Secondary Amenorrhea**. ### **Explanation** The diagnosis is based on the **Progesterone Challenge Test (PCT)** followed by the **Estrogen-Progesterone (E+P) Challenge Test**. 1. **Why Uterus is Correct:** When a patient with secondary amenorrhea fails to bleed after receiving combined Estrogen and Progesterone, it indicates an **end-organ failure**. For menstruation to occur, there must be a functional endometrium and a patent outflow tract. A negative E+P challenge (no withdrawal bleed) confirms that the endometrium is either absent, scarred, or unresponsive, or there is an anatomical obstruction. The most common cause in this scenario is **Asherman’s Syndrome** (intrauterine synechiae) or cervical stenosis. 2. **Why Other Options are Incorrect:** * **Hypothalamus (B) & Pituitary (A):** If the defect were at the level of the HPO axis (low GnRH or low FSH/LH), the endometrium would still be responsive. Providing exogenous E+P would prime the endometrium and cause a withdrawal bleed. * **Ovary (D):** In Premature Ovarian Failure, the endogenous estrogen is low, but the uterus remains functional. Administering exogenous E+P would result in a withdrawal bleed. ### **NEET-PG High-Yield Pearls** * **Step 1:** Rule out pregnancy (Urine Pregnancy Test). * **Step 2:** Check TSH and Prolactin levels. * **Step 3 (PCT):** Give Medroxyprogesterone acetate (10mg for 5–10 days). Bleeding = Anovulation (PCOS is the most common cause). * **Step 4 (E+P Challenge):** If PCT is negative, give Estrogen (21 days) + Progesterone (last 10 days). * **Bleeding:** Problem is in the HPO Axis (Hypothalamus/Pituitary) or Ovaries. * **No Bleeding:** Problem is in the **Outflow tract/Uterus** (e.g., Asherman’s Syndrome).

Question 62: What is the drug of choice in premenstrual syndrome?

A. Antipsychotics
B. SSRI (Selective Serotonin Reuptake Inhibitors) (Correct Answer)
C. OCP (Oral Contraceptive Pills)
D. Depo-progesterone

Explanation: ### Explanation **Premenstrual Syndrome (PMS)** and its more severe form, **Premenstrual Dysphoric Disorder (PMDD)**, are characterized by cyclic physical and emotional symptoms occurring during the luteal phase. The pathophysiology is linked to the interaction between fluctuating ovarian steroids and central neurotransmitters, particularly **Serotonin**. **1. Why SSRIs are the Drug of Choice (DOC):** Selective Serotonin Reuptake Inhibitors (SSRIs) like **Fluoxetine, Sertraline, and Paroxetine** are the first-line treatment because they directly address the underlying serotonergic deficiency. Unlike their use in major depression (which takes weeks to work), SSRIs in PMS/PMDD provide rapid symptom relief and can be administered either continuously or **luteal-phase only** (starting on day 14 and stopping at the onset of menses). **2. Analysis of Incorrect Options:** * **Antipsychotics:** These are not indicated for PMS. While PMS involves mood changes, it is not a psychotic disorder. * **OCPs:** These are second-line treatments. While they suppress ovulation (the trigger for PMS), they may sometimes worsen mood symptoms due to the progestogen component. However, OCPs containing **Drospirenone** are specifically effective for physical symptoms. * **Depo-progesterone:** Progestogens alone are generally not effective and can occasionally exacerbate the depressive symptoms of PMS. **3. High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Prospective charting of symptoms for at least **two consecutive cycles** (e.g., using the Daily Record of Severity of Problems). * **First-line Non-pharmacological:** Lifestyle modifications (exercise, complex carbohydrates, and reducing caffeine/alcohol). * **Definitive Treatment:** Surgical oophorectomy (only in extreme, refractory cases). * **Spironolactone:** The drug of choice specifically for **premenstrual bloating** and edema. * **Vitamin B6 (Pyridoxine):** Often used as a supplement to aid serotonin synthesis.

Question 63: The presentation of Asherman syndrome typically involves which of the following?

A. Hypomenorrhea (Correct Answer)
B. Oligomenorrhea
C. Menorrhagia
D. Metrorrhagia

Explanation: **Explanation:** **Asherman Syndrome** is characterized by the formation of intrauterine adhesions (synechiae) following trauma to the basal layer of the endometrium, most commonly due to over-zealous curettage (D&C) after a miscarriage or postpartum hemorrhage. **Why Hypomenorrhea is Correct:** The primary pathology is the partial or complete obliteration of the uterine cavity by fibrous bands. This reduces the functional surface area of the endometrium available for hormonal response and shedding. Consequently, patients present with **hypomenorrhea** (scanty menses) or **amenorrhea** (absence of menses). Since the ovaries remain functional, the hormonal profile is normal, but the "end-organ" (uterus) cannot respond. **Analysis of Incorrect Options:** * **B. Oligomenorrhea:** This refers to infrequent cycles (>35 days apart), usually caused by hypothalamic-pituitary-ovarian axis dysfunction (e.g., PCOS). In Asherman syndrome, the cycle frequency is often regular, but the flow volume is reduced. * **C. Menorrhagia & D. Metrorrhagia:** These involve heavy or irregular bleeding, typically associated with structural lesions like fibroids, polyps, or hormonal imbalances. Asherman syndrome involves a *loss* of tissue, making heavy bleeding clinically impossible. **NEET-PG High-Yield Pearls:** * **Gold Standard Investigation:** Hysteroscopy (it is both diagnostic and therapeutic). * **HSG Finding:** Shows characteristic "filling defects" or a "honeycomb appearance." * **Treatment:** Hysteroscopic adhesiolysis followed by an IUCD or Foley catheter insertion and high-dose estrogen therapy to promote endometrial regrowth. * **Netter’s Syndrome:** A specific form of Asherman syndrome caused by genital tuberculosis.

Question 64: Amenorrhea for three months in a female may indicate the following EXCEPT:

A. Pregnancy
B. Tuberculosis of the genital tract
C. Endometriosis (Correct Answer)
D. Sheehan's syndrome

Explanation: **Explanation:** The core concept tested here is the etiology of **secondary amenorrhea** (the absence of menses for 3 months in a woman with previously normal cycles). **Why Endometriosis is the Correct Answer:** Endometriosis is defined as the presence of functioning endometrial tissue outside the uterine cavity. Clinically, it is characterized by **cyclical pelvic pain (dysmenorrhea)**, dyspareunia, and infertility. Crucially, endometriosis **does not cause amenorrhea**; in fact, it is often associated with regular cycles or even menorrhagia (heavy bleeding). Therefore, it is the "except" in this list. **Analysis of Incorrect Options:** * **Pregnancy:** This is the **most common cause** of secondary amenorrhea in women of reproductive age. It must always be ruled out first via a urine pregnancy test (hCG). * **Genital Tuberculosis:** In developing countries, TB is a major cause of secondary amenorrhea. It causes chronic endometritis leading to intrauterine synechiae (**Asherman’s Syndrome**) or destruction of the ovaries, resulting in permanent cessation of menses. * **Sheehan’s Syndrome:** This is post-partum pituitary necrosis due to severe obstetric hemorrhage. The resulting panhypopituitarism leads to a failure of gonadotropin (FSH/LH) secretion, causing secondary amenorrhea and failure of lactation. **High-Yield NEET-PG Pearls:** * **First investigation for secondary amenorrhea:** Urine Pregnancy Test. * **Most common cause of primary amenorrhea:** Turner Syndrome (45,XO). * **Asherman’s Syndrome:** Diagnosis is best made via Hysteroscopy (Gold Standard) or HSG (shows "honeycomb" appearance). * **Sheehan’s Syndrome:** The earliest clinical sign is the failure of lactation (prolactin deficiency).

Question 65: Which of the following is the definition of primary amenorrhea?

A. Absence of menses by the age of 12 years, irrespective of the presence of normal growth and development of secondary sexual characteristics.
B. Absence of menses by the age of 13 years, irrespective of the presence of normal growth and development of secondary sexual characteristics.
C. Absence of menses by the age of 14 years, irrespective of the presence of normal growth and development of secondary sexual characteristics.
D. Absence of menses by the age of 15 years, irrespective of the presence of normal growth and development of secondary sexual characteristics. (Correct Answer)

Explanation: Primary amenorrhea is defined based on the failure of menarche to occur within a specific developmental timeline. According to the current guidelines (ACOG), the diagnosis is made if there is an **absence of menses by age 15 years** in the presence of normal growth and secondary sexual characteristics. ### Why Option D is Correct: The medical rationale is based on the statistical distribution of menarche. By age 15, approximately 98% of girls have started their periods. If menses have not occurred by this age, even with normal breast development (thelarche) and pubic hair (adrenarche), a clinical evaluation for outflow tract obstructions (e.g., imperforate hymen) or genetic/endocrine disorders is warranted. ### Why Other Options are Incorrect: * **Options A & B (12 and 13 years):** These are too early. While the average age of menarche is approximately 12.4 years, many healthy girls start later. * **Option C (14 years):** Previously, 14 years was the cutoff if secondary sexual characteristics were absent. However, for a girl with **normal** secondary sexual characteristics, the threshold is 15 years. ### NEET-PG High-Yield Pearls: * **The "Rule of 13 & 15":** Primary amenorrhea is also diagnosed if there is no menses **and** no secondary sexual characteristics by **age 13**. * **Most Common Cause:** The most common cause of primary amenorrhea is **Genetic/Gonadal dysgenesis (Turner Syndrome, 45,XO)**. * **Second Most Common Cause:** Müllerian agenesis (Mayer-Rokitansky-Küster-Hauser syndrome). * **Initial Step in Evaluation:** A thorough physical exam (to check for secondary sexual characteristics) followed by a pregnancy test (to rule out the most common cause of any amenorrhea) and an ultrasound to confirm the presence of a uterus.

Question 66: What is the most common cause of menorrhagia during puberty?

A. Anovulation (Correct Answer)
B. Malignancy
C. Endometriosis
D. Bleeding disorder

Explanation: **Explanation:** **1. Why Anovulation is Correct:** In the first few years following menarche, the Hypothalamic-Pituitary-Ovarian (HPO) axis is immature. This leads to **anovulatory cycles**, which are the most common cause of Abnormal Uterine Bleeding (AUB) in adolescents. In the absence of ovulation, no corpus luteum is formed, leading to a lack of progesterone. The endometrium remains under the continuous, unopposed influence of estrogen, causing it to become hyperplastic and vascular. Eventually, this thickened lining outgrows its blood supply, leading to irregular, heavy, and prolonged shedding (estrogen breakthrough bleeding). **2. Why Other Options are Incorrect:** * **Malignancy:** While a concern in postmenopausal women, genital tract malignancies (like endometrial cancer) are extremely rare in the pubertal age group. * **Endometriosis:** This typically presents with chronic pelvic pain and secondary dysmenorrhea rather than heavy menstrual bleeding (menorrhagia). * **Bleeding Disorders:** Conditions like Von Willebrand Disease (vWD) are the most common *organic* or *systemic* cause of adolescent menorrhagia (found in up to 20% of severe cases), but they are statistically less common than physiological anovulation. **Clinical Pearls for NEET-PG:** * **First-line investigation** for AUB in adolescents: Pelvic Ultrasound (usually shows a thick endometrium). * **First-line management** for mild/moderate anovulatory AUB: Combined Oral Contraceptive Pills (OCPs) or cyclic progestins to stabilize the endometrium. * **High-Yield Fact:** If an adolescent presents with menorrhagia requiring hospitalization or blood transfusion at the time of **menarche**, always screen for **Von Willebrand Disease**.

Question 67: Which of the following is NOT a cause of amenorrhea?

A. Pituitary adenoma
B. Chronic nephritis
C. Tubercular endometritis
D. Adenomyosis (Correct Answer)

Explanation: **Explanation:** The correct answer is **Adenomyosis**. To understand why, we must look at the pathophysiology of the menstrual cycle. Amenorrhea (absence of menses) occurs when there is a disruption in the Hypothalamic-Pituitary-Ovarian (HPO) axis or an anatomical defect in the outflow tract. **Why Adenomyosis is the correct answer:** Adenomyosis is characterized by the presence of endometrial glands and stroma within the myometrium. This leads to an enlarged, globular uterus and increased surface area of the endometrium. Clinically, it presents with **menorrhagia** (heavy menstrual bleeding) and **dysmenorrhea** (painful periods), rather than the absence of periods. It is a cause of Abnormal Uterine Bleeding (AUB-A), not amenorrhea. **Analysis of Incorrect Options:** * **Pituitary Adenoma:** Prolactin-secreting tumors (prolactinomas) inhibit the pulsatile release of GnRH, leading to hypogonadotropic hypogonadism and **secondary amenorrhea**. * **Chronic Nephritis:** Chronic systemic illnesses (like renal failure or severe anemia) act as metabolic stressors that suppress the HPO axis, leading to **functional hypothalamic amenorrhea**. * **Tubercular Endometritis:** In developing countries, TB is a leading cause of **Asherman-like syndrome**. Chronic infection leads to the destruction of the basal layer of the endometrium and subsequent intrauterine adhesions (synechiae), causing permanent amenorrhea. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of Primary Amenorrhea:** Turner Syndrome (45, XO). * **Most common cause of Secondary Amenorrhea:** Pregnancy (always rule this out first!). * **Asherman Syndrome:** Diagnosis is confirmed via Hysterosalpingography (HSG) or Hysteroscopy (Gold Standard). * **Adenomyosis Triad:** Menorrhagia, Dysmenorrhea, and a symmetrically enlarged "bulky" uterus.

Question 68: All of the following are true about pubertal menorrhagia EXCEPT:

A. Associated with anovulatory bleeding
B. Endometrial biopsy confirms diagnosis (Correct Answer)
C. Routine screening for bleeding disorder is done
D. Hematinics and hormone therapy is the treatment of choice

Explanation: **Explanation:** Pubertal menorrhagia refers to excessive menstrual bleeding occurring between menarche and 19 years of age. Understanding its pathophysiology is crucial for NEET-PG. **Why Option B is the Correct Answer (The "Except"):** Endometrial biopsy is **contraindicated** and unnecessary in adolescents. The primary cause of pubertal menorrhagia is an immature Hypothalamic-Pituitary-Ovarian (HPO) axis, not malignancy. In this age group, the risk of endometrial cancer is near zero; therefore, invasive procedures like biopsy or D&C are avoided unless there is a high suspicion of rare pathology or failure of medical management in older patients. **Analysis of Other Options:** * **Option A:** Most cases (up to 80%) are due to **anovulatory cycles**. The immature HPO axis fails to trigger a LH surge, leading to persistent estrogen stimulation without progesterone. This results in an unstable, thickened endometrium that sheds irregularly and heavily. * **Option C:** Up to 20% of adolescents presenting with severe menorrhagia have an underlying **bleeding disorder**, most commonly **von Willebrand Disease (vWD)**. Routine screening (CBC, PT, APTT, Bleeding time) is mandatory. * **Option D:** Management is primarily medical. **Hematinics** (Iron supplements) treat the resulting anemia, while **hormonal therapy** (OCPs or cyclic progestins) stabilizes the endometrium and regulates the cycle. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Anovulatory DUB (due to HPO axis immaturity). * **Most common systemic cause:** von Willebrand Disease. * **First-line investigation:** Pelvic Ultrasound (USG) to rule out structural causes and blood work for coagulopathy. * **Drug of choice for acute heavy bleeding:** High-dose Estrogen or OCPs to "seal" the bleeding vessels.

Question 69: Which of the following is NOT a cause of abnormal uterine bleeding prior to menarche?

A. Vulvovaginitis
B. Foreign body and abuse
C. Anovulation (Correct Answer)
D. Precocious puberty

Explanation: **Explanation:** The key to answering this question lies in understanding the physiological state of the female reproductive system **prior to menarche**. **1. Why Anovulation is the Correct Answer:** Anovulation refers to the absence of ovulation during a menstrual cycle. For anovulation to be a cause of abnormal uterine bleeding (AUB), the **Hypothalamic-Pituitary-Ovarian (HPO) axis** must already be active and the endometrium must be primed by estrogen. Since menarche marks the first occurrence of menstruation (signaling the start of HPO activity), anovulation cannot occur *prior* to menarche. It is, however, the most common cause of AUB in the post-menarchal adolescent period. **2. Analysis of Incorrect Options:** * **Vulvovaginitis (A):** This is the most common cause of prepubertal vaginal bleeding/discharge. The thin, hypoestrogenic vaginal mucosa in children is highly susceptible to infection and irritation. * **Foreign Body and Abuse (B):** These are critical differential diagnoses in children. Foreign bodies (like toilet paper) cause foul-smelling bloody discharge, while sexual abuse must always be ruled out in cases of unexplained genital bleeding. * **Precocious Puberty (D):** This involves the premature activation of the HPO axis (before age 8). It leads to early endometrial stimulation and subsequent withdrawal bleeding, making it a recognized cause of pre-menarchal bleeding. **Clinical Pearls for NEET-PG:** * **Most common cause of prepubertal bleeding:** Vulvovaginitis. * **Most common cause of adolescent AUB:** Anovulation (due to immature HPO axis). * **Most common cause of postmenopausal bleeding:** Atrophic endometritis/vaginitis (though malignancy must be ruled out). * **Red Flag:** Any vaginal bleeding before the development of secondary sexual characteristics (Thelarche) requires immediate investigation for trauma, foreign bodies, or tumors (e.g., Sarcoma botryoides).

Question 70: Spasmodic pain during dysmenorrhea is attributed to:

A. PGE1
B. PGE2
C. PGI2
D. PGF2-$\alpha$ (Correct Answer)

Explanation: **Explanation:** The correct answer is **PGF2-$\alpha$**. **1. Why PGF2-$\alpha$ is correct:** Primary dysmenorrhea is characterized by spasmodic pain caused by increased production of prostaglandins in the secretory endometrium. Under the influence of progesterone, the enzyme **cyclooxygenase (COX)** is activated during menstruation. This leads to high levels of **PGF2-$\alpha$**, which is a potent **vasoconstrictor and myometrial stimulant**. It causes high-frequency, uncoordinated uterine contractions and reduces uterine blood flow (ischemia), leading to the classic "crampy" spasmodic pain. **2. Why the other options are incorrect:** * **PGE1:** This is a synthetic prostaglandin (e.g., Misoprostol) used for cervical ripening and induction of labor, but it is not the primary endogenous mediator of dysmenorrhea. * **PGE2:** While PGE2 is present in the menstrual fluid and contributes to pain by sensitizing nerve endings, it is primarily a **vasodilator**. PGF2-$\alpha$ is the dominant factor responsible for the intense spasmodic contractions. * **PGI2 (Prostacyclin):** This is a potent vasodilator and inhibitor of platelet aggregation. It actually counteracts the effects of PGF2-$\alpha$; a deficiency in PGI2 relative to PGF2-$\alpha$ is often noted in women with severe dysmenorrhea. **3. Clinical Pearls for NEET-PG:** * **First-line treatment:** NSAIDs (e.g., Mefenamic acid) are the drug of choice because they inhibit the COX enzyme, directly reducing PGF2-$\alpha$ synthesis. * **Timing:** Prostaglandin levels are highest during the first 48 hours of menstruation, which correlates with the peak intensity of symptoms. * **Secondary Dysmenorrhea:** If pain does not respond to NSAIDs or OCPs, clinicians should investigate for secondary causes like **Endometriosis** (most common) or Adenomyosis.

Practice by Chapter

Normal Menstrual Physiology

Practice Questions

Primary Dysmenorrhea

Practice Questions

Secondary Dysmenorrhea

Practice Questions

Premenstrual Syndrome and PMDD

Practice Questions

Primary Amenorrhea

Practice Questions

Secondary Amenorrhea

Practice Questions

Polycystic Ovary Syndrome

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Abnormal Uterine Bleeding: Classification

Practice Questions

Evaluation of Menstrual Disorders

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Management Approaches to Menstrual Disorders

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