Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy Indian Medical PG Practice Questions and MCQs

Question 141: While evaluating the heart of a 29-year old primigravida at term, you notice that there is an S2 and S3 which are easily audible and a systolic ejection murmur greater during inspiration. What do you recognize?

A. The presence of S3 is abnormal.
B. The systolic ejection murmur is unusual in a pregnant woman at term.
C. Wide pulse pressure is rare in pregnant women.
D. All findings recorded are normal changes in pregnancy. (Correct Answer)

Explanation: **Explanation:** During pregnancy, the cardiovascular system undergoes significant physiological adaptations to meet the metabolic demands of the fetus. These changes often mimic cardiac pathology in non-pregnant individuals but are considered normal in this context. **Why Option D is correct:** 1. **S3 Gallop:** Increased blood volume (up to 50%) and rapid ventricular filling lead to a physiological third heart sound (S3) in most pregnant women. 2. **Systolic Ejection Murmur (SEM):** Increased cardiac output and decreased blood viscosity create a "hyperdynamic state." This results in a functional SEM (Grade I or II), typically heard best at the left sternal border. 3. **Inspiratory Variation:** During inspiration, increased venous return to the right heart can accentuate these flow murmurs. 4. **S2 Changes:** Exaggerated splitting of the second heart sound (S2) is also common due to delayed closure of the pulmonary valve. **Analysis of Incorrect Options:** * **Option A:** S3 is a normal finding in pregnancy due to rapid ventricular filling; it is only considered pathological if accompanied by other signs of heart failure. * **Option B:** Up to 90% of pregnant women develop a systolic flow murmur. It is diastolic murmurs that are always considered pathological. * **Option C:** Pulse pressure actually **increases** during pregnancy because the diastolic blood pressure drops more significantly (due to progesterone-mediated vasodilation) than the systolic pressure. **NEET-PG High-Yield Pearls:** * **Normal findings:** S3, SEM, loud S1, and shifted apex beat (upward and to the left). * **Abnormal findings:** Any **Diastolic murmur**, S4 gallop, or Grade III/IV systolic murmur. * **ECG changes:** Left axis deviation is common due to the diaphragm being pushed upward by the gravid uterus. * **Plasma Volume:** Increases by 50%, while RBC mass increases by 20-30%, leading to **physiological anemia**.

Question 142: What is the target for fasting blood sugar and HbA1c in a patient with gestational diabetes mellitus?

A. <90 mg/dL, HbA1c <6%
B. <95 mg/dL, HbA1c <6%
C. <90 mg/dL, HbA1c <6.5%
D. <95 mg/dL, HbA1c <6.5% (Correct Answer)

Explanation: **Explanation:** The management of Gestational Diabetes Mellitus (GDM) focuses on strict glycemic control to prevent maternal and fetal complications such as macrosomia, preeclampsia, and neonatal hypoglycemia. **1. Why Option D is Correct:** According to the **ACOG (American College of Obstetricians and Gynecologists)** and **DIPSI (Diabetes in Pregnancy Study Group India)** guidelines, the glycemic targets for GDM are: * **Fasting Blood Sugar (FBS):** <95 mg/dL. * **1-hour Postprandial:** <140 mg/dL. * **2-hour Postprandial:** <120 mg/dL. * **HbA1c:** The target is **<6.5%** (some guidelines suggest <6% if achievable without significant hypoglycemia, but 6.5% is the standard threshold to reduce the risk of congenital anomalies and adverse outcomes). **2. Analysis of Incorrect Options:** * **Options A & C (<90 mg/dL):** While a target of <90 mg/dL is sometimes used in pre-gestational Type 1 or Type 2 Diabetes, the standard threshold for GDM diagnosis and management starts at <95 mg/dL. * **Options A & B (HbA1c <6%):** While <6% is ideal, <6.5% is the clinically accepted target in pregnancy to balance fetal safety with the risk of maternal hypoglycemia. **3. NEET-PG High-Yield Pearls:** * **Screening:** In India, the **DIPSI** criteria (75g glucose load regardless of last meal) is used. A 2-hour value **≥140 mg/dL** diagnoses GDM. * **First-line Management:** Medical Nutrition Therapy (MNT) and exercise for 1–2 weeks. * **Pharmacotherapy:** If MNT fails, **Insulin** is the gold standard. Among oral hypoglycemics, **Metformin** is commonly used, though it crosses the placenta. * **HbA1c Limitation:** HbA1c is less reliable in pregnancy due to increased red cell turnover; hence, daily self-monitoring of blood glucose (SMBG) is preferred.

Question 143: Which of the following are characteristic congenital anomalies in the fetus of a diabetic mother?

A. Sacral agenesis (Correct Answer)
B. Hypoplastic lung
C. Cardiac anomalies
D. Anencephaly

Explanation: **Explanation:** In pregnancies complicated by pre-gestational diabetes, the risk of congenital malformations is 3–4 times higher than in the general population, primarily due to poor glycemic control during organogenesis (the first trimester). **Why Sacral Agenesis is the Correct Answer:** While cardiac defects are numerically the most common anomalies, **Sacral agenesis (Caudal Regression Syndrome)** is the most **pathognomonic** or characteristic anomaly associated with diabetic embryopathy. It involves the incomplete development of the lower spine and sacrum. Although rare in the general population, its relative risk is increased over 200-fold in infants of diabetic mothers, making it a classic "hallmark" finding for exams. **Analysis of Incorrect Options:** * **B. Hypoplastic lung:** This is typically associated with oligohydramnios (e.g., Potter sequence) or congenital diaphragmatic hernia, not specifically with maternal diabetes. * **C. Cardiac anomalies:** These are the **most common** malformations (e.g., Transposition of Great Arteries, VSD, and Hypertrophic Cardiomyopathy), but they are not as "characteristic" or specific as sacral agenesis. * **D. Anencephaly:** Neural tube defects (NTDs) are significantly increased in diabetic pregnancies, but they are seen in many other conditions (like folate deficiency) and lack the high specificity of caudal regression. **High-Yield Clinical Pearls for NEET-PG:** * **Most common anomaly overall:** Cardiac defects (specifically VSD). * **Most specific/characteristic anomaly:** Sacral agenesis (Caudal Regression Syndrome). * **Most common CNS anomaly:** Neural tube defects (Anencephaly/Spina Bifida). * **HbA1c Correlation:** The risk of malformations increases significantly if the periconceptional HbA1c is >8.5%. * **Gestational Diabetes (GDM):** Usually does not cause these anomalies because the hyperglycemia typically develops after the period of organogenesis.

Question 144: Which of the following is responsible for ligament laxity during pregnancy?

A. Estrogen
B. Prolactin
C. Progesterone (Correct Answer)
D. hCG

Explanation: ### Explanation **Correct Option: C. Progesterone** Progesterone is the primary hormone responsible for the generalized relaxation of smooth muscles and connective tissues during pregnancy. It induces **ligamentous laxity** by increasing the water content and decreasing the collagen density within the ligaments. This physiological change is most prominent in the pelvic joints (symphysis pubis and sacroiliac joints), facilitating the expansion of the birth canal during labor. However, this systemic effect also leads to common pregnancy complaints such as backache and increased risk of joint sprains. **Analysis of Incorrect Options:** * **A. Estrogen:** While estrogen promotes the growth of the uterine musculature and increases vascularity, its primary role in connective tissue is stimulatory (hypertrophy) rather than relaxant. * **B. Prolactin:** This hormone is primarily responsible for lactogenesis (milk production) and the preparation of mammary glands; it has no significant effect on ligamentous tension. * **D. hCG:** Human Chorionic Gonadotropin is essential for maintaining the corpus luteum in early pregnancy to ensure progesterone production, but it does not directly act on ligaments. **High-Yield Clinical Pearls for NEET-PG:** * **Relaxin vs. Progesterone:** While **Relaxin** (produced by the corpus luteum and placenta) specifically targets the softening of the cervix and the symphysis pubis, **Progesterone** is the broader mediator of systemic ligamentous laxity and smooth muscle relaxation (leading to GERD and hydroureter of pregnancy). * **Lordosis:** The combination of ligament laxity and a shifting center of gravity leads to **progressive lordosis**, the most common cause of lower back pain in pregnancy. * **Relaxin Peak:** Relaxin levels are highest in the first trimester and at the time of delivery.

Question 145: In a patient with gestational diabetes mellitus, which of the following conditions is NOT typically seen in the mother or the newborn?

A. Polyhydramnios in the mother
B. Congenital malformations of the fetus (Correct Answer)
C. Macrosomia of the newborn
D. Hypocalcemia in the newborn

Explanation: **Explanation:** The key to answering this question lies in distinguishing between **Pre-gestational Diabetes (Type 1 or 2)** and **Gestational Diabetes Mellitus (GDM)**. **Why Option B is the Correct Answer:** Congenital malformations occur during **organogenesis**, which takes place in the first 8 weeks of pregnancy. In GDM, hyperglycemia typically develops in the second or third trimester (after 24 weeks) due to increased insulin resistance from placental hormones (like hPL). Since the glycemic insult occurs *after* organs have formed, GDM is **not** associated with an increased risk of congenital anomalies. In contrast, pre-gestational diabetes with poor periconceptional glycemic control is strongly linked to malformations like Caudal Regression Syndrome and Cardiac defects. **Analysis of Incorrect Options:** * **A. Polyhydramnios:** Fetal hyperglycemia leads to osmotic diuresis, causing fetal polyuria, which increases the amniotic fluid volume. * **C. Macrosomia:** Maternal glucose crosses the placenta, but insulin does not. The fetal pancreas responds with hyperinsulinemia. Insulin acts as a potent growth hormone, leading to excessive fat deposition and macrosomia. * **D. Hypocalcemia:** Neonatal hypocalcemia is common in diabetic pregnancies, often linked to functional hypoparathyroidism caused by maternal-fetal magnesium loss. **NEET-PG High-Yield Pearls:** * **Most common malformation in Pre-gestational DM:** Ventricular Septal Defect (VSD). * **Most specific malformation in Pre-gestational DM:** Caudal Regression Syndrome (Sacral Agenesis). * **GDM Screening:** Best done at 24–28 weeks using the 75g OGTT (DIPSI or IADPSG criteria). * **Neonatal Complications:** Hypoglycemia, Hypocalcemia, Hyperbilirubinemia, and Polycythemia.

Question 146: Under which of the following conditions does the uterus show both hypertrophy and hyperplasia simultaneously?

A. Pregnancy (Correct Answer)
B. Multiparity
C. Nulliparity
D. Puberty

Explanation: **Explanation:** The correct answer is **Pregnancy**. During pregnancy, the uterus undergoes a massive increase in size and weight (from ~70g to ~1100g) to accommodate the growing fetus. This enlargement is driven by two distinct cellular processes: 1. **Hypertrophy:** An increase in the size of individual myometrial cells (fibers). This is the dominant process, especially after the first trimester, driven by mechanical stretch. 2. **Hyperplasia:** An increase in the total number of myometrial cells. This occurs primarily in the early stages of pregnancy under the influence of estrogen. **Why other options are incorrect:** * **Multiparity:** This refers to a woman who has given birth multiple times. While the uterus may remain slightly larger than a nulliparous uterus (permanent structural changes), active hypertrophy and hyperplasia are features of the *gestational state*, not the state of having previously given birth. * **Nulliparity:** This refers to a woman who has never given birth. The uterus remains in its baseline, non-pregnant state. * **Puberty:** While the uterus grows during puberty due to hormonal stimulation (estrogen), the simultaneous, massive, and rapid combination of both hypertrophy and hyperplasia is the hallmark physiological response unique to **pregnancy**. **High-Yield Clinical Pearls for NEET-PG:** * **Hormonal Influence:** Early uterine growth is due to **Estrogen** (hormone-dependent); later growth is due to **Mechanical Stretch** (pressure-dependent). * **Muscle Arrangement:** The myometrium develops an "interlacing figure-of-eight" pattern, which acts as "living ligatures" to prevent postpartum hemorrhage. * **Uterine Blood Flow:** Increases from 50 mL/min in the non-pregnant state to approximately **500–750 mL/min** at term.

Question 147: Which of the following biochemical changes is NOT typically seen in established cases of Stein-Leventhal syndrome?

A. Marked elevation of LH in contrast to FSH
B. Insulin resistance
C. Elevation of plasma testosterone
D. Elevation of sex hormone-binding globulin (SHBG) level (Correct Answer)

Explanation: **Explanation:** Stein-Leventhal syndrome, commonly known as **Polycystic Ovary Syndrome (PCOS)**, is characterized by a state of hyperandrogenism and insulin resistance. **Why Option D is correct:** In PCOS, **Sex Hormone-Binding Globulin (SHBG) levels are typically decreased**, not elevated. This reduction is primarily driven by hyperinsulinemia and obesity, which suppress hepatic production of SHBG. Lower SHBG levels result in an increase in the **Free Androgen Index (FAI)**, meaning more testosterone is biologically active (unbound) in the circulation, contributing to hirsutism and acne. **Why the other options are incorrect:** * **Option A:** A classic biochemical hallmark is an **elevated LH:FSH ratio** (often >2:1 or 3:1). High-frequency GnRH pulses favor LH secretion, while FSH is relatively suppressed, leading to follicular arrest. * **Option B:** **Insulin resistance** is a core pathophysiological feature of PCOS, occurring in both obese and lean phenotypes. It leads to compensatory hyperinsulinemia, which stimulates ovarian theca cells to produce more androgens. * **Option C:** **Hyperandrogenism** is a diagnostic criterion. Elevated plasma testosterone (produced by theca cells) and androstenedione are typically seen. **High-Yield Clinical Pearls for NEET-PG:** * **Rotterdam Criteria:** Diagnosis requires 2 out of 3: (1) Clinical/biochemical hyperandrogenism, (2) Oligo/anovulation, (3) Polycystic ovaries on ultrasound ("String of pearls" appearance). * **Gold Standard for Insulin Resistance:** Hyperinsulinemic-euglycemic clamp (though rarely used clinically). * **First-line for Ovulation Induction:** Letrozole (now preferred over Clomiphene citrate). * **Long-term Risks:** Endometrial carcinoma (due to unopposed estrogen), Type 2 Diabetes, and Metabolic Syndrome.

Question 148: What are the threshold values for the diagnosis of Gestational Diabetes Mellitus using a 75g Oral Glucose Tolerance Test?

A. Fasting: 92 mg/dL, 1-hour: 180 mg/dL, 2-hour: 153 mg/dL (Correct Answer)
B. Fasting: 92 mg/dL, 1-hour: 180 mg/dL, 2-hour: 155 mg/dL
C. Fasting: 95 mg/dL, 1-hour: 180 mg/dL, 2-hour: 153 mg/dL
D. Fasting: 95 mg/dL, 1-hour: 180 mg/dL, 2-hour: 155 mg/dL

Explanation: The diagnosis of Gestational Diabetes Mellitus (GDM) has been standardized globally by the **IADPSG (International Association of Diabetes and Pregnancy Study Groups)** and adopted by the **WHO**. ### 1. Why Option A is Correct The IADPSG criteria utilize a **one-step 75g Oral Glucose Tolerance Test (OGTT)** performed between 24–28 weeks of gestation. GDM is diagnosed if **one or more** of the following plasma glucose values are met or exceeded: * **Fasting:** 92 mg/dL * **1-hour:** 180 mg/dL * **2-hour:** 153 mg/dL These thresholds were derived from the HAPO study, which identified these specific levels as the points where the risk for adverse neonatal outcomes (like macrosomia) significantly increases. ### 2. Analysis of Incorrect Options * **Option B & D (155 mg/dL):** The 155 mg/dL value for the 2-hour mark is part of the older **Carpenter-Coustan criteria** (which uses a 100g, 3-hour OGTT). It is not used in the modern 75g IADPSG/WHO protocol. * **Option C & D (95 mg/dL):** The fasting value of 95 mg/dL is also associated with the Carpenter-Coustan or NDDG criteria. The IADPSG criteria use a stricter fasting cutoff of **92 mg/dL**. ### 3. NEET-PG High-Yield Pearls * **DIPSI Guidelines (India):** In the Indian context, the DIPSI (Diabetes in Pregnancy Study Group India) recommends a "single-step" 75g test regardless of the last meal. A **2-hour value ≥ 140 mg/dL** is diagnostic. * **Screening Time:** Routine screening is done at **24–28 weeks**. High-risk patients should be screened at the first prenatal visit. * **Overt Diabetes:** If Fasting is ≥ 126 mg/dL or HbA1c is ≥ 6.5% at the first visit, it is classified as "Overt/Pre-gestational Diabetes," not GDM.

Question 149: Which of the following statements regarding hormonal changes during pregnancy is FALSE?

A. The level of progesterone is higher in the third trimester compared to the first trimester.
B. The level of hCG is higher in the third trimester compared to the first trimester. (Correct Answer)
C. The level of estriol is lower in the first trimester compared to the third trimester.
D. The level of human placental lactogen is lower in the first trimester compared to the third trimester.

Explanation: **Explanation:** The correct answer is **B**. Human Chorionic Gonadotropin (hCG) is unique among pregnancy hormones because its levels do not increase linearly throughout gestation. hCG is produced by the syncytiotrophoblast and peaks at approximately **8–10 weeks** (first trimester), reaching levels of about 100,000 mIU/mL. After this peak, levels decline significantly and reach a lower plateau by 20 weeks, which is maintained until term. Therefore, hCG levels are much higher in the first trimester than in the third. **Analysis of other options:** * **Option A (Progesterone):** Progesterone levels rise steadily throughout pregnancy. Initially produced by the corpus luteum, the placenta takes over production (luteal-placental shift) by 7–9 weeks, with levels peaking in the third trimester to maintain uterine quiescence. * **Option C (Estriol):** Estrogens (Estrone, Estradiol, and Estriol) increase progressively. Estriol (E3), specifically, is the dominant estrogen of pregnancy and serves as a marker of feto-placental well-being. Its levels are significantly higher in the third trimester. * **Option D (hPL):** Human Placental Lactogen (hPL) is secreted by the placenta in direct proportion to placental mass. Since the placenta grows throughout pregnancy, hPL levels are lowest in the first trimester and peak near term. **High-Yield NEET-PG Pearls:** * **hCG Doubling Time:** In early normal pregnancy, hCG levels double every 48 hours. * **hPL Function:** It is the primary hormone responsible for the **diabetogenic state** of pregnancy (insulin resistance). * **Estriol (E3):** Synthesis requires the fetal adrenal gland and liver; hence, it is a marker of fetal health. * **Progesterone:** Essential for maintaining the "progesterone block," preventing premature uterine contractions.

Question 150: Gestational diabetes mellitus (GDM) is associated with an increased risk of maternal and fetal/neonatal complications. Which of the following statements about congenital anomalies in diabetes mellitus is FALSE?

A. Results due to free radical injury
B. 6-10% of cases are associated with major congenital abnormality
C. Single umbilical artery is only seen in gestational diabetes (Correct Answer)
D. Insulin can be given

Explanation: **Explanation:** The correct answer is **C**. The statement "Single umbilical artery is only seen in gestational diabetes" is false because a single umbilical artery (SUA) is a non-specific finding. While it is more common in diabetic pregnancies (both pre-gestational and GDM), it is also associated with other chromosomal abnormalities (like Trisomy 18), renal anomalies, and can occur in up to 1% of normal singleton pregnancies. **Analysis of Options:** * **Option A (True):** The pathogenesis of diabetic embryopathy involves maternal hyperglycemia leading to fetal hyperglycemia. This triggers the production of **reactive oxygen species (ROS)** and free radical injury, which causes oxidative stress and inhibits key developmental genes (like *Pax-3*), leading to malformations. * **Option B (True):** In women with pre-gestational diabetes (Type 1 or 2), the risk of major congenital malformations is **6–10%**, which is 2–3 times higher than the general population. * **Option D (True):** Insulin is the **gold standard** for managing diabetes in pregnancy as it does not cross the placenta and effectively controls glycemic levels to reduce the risk of macrosomia and other complications. **NEET-PG High-Yield Pearls:** 1. **Most Common Anomaly:** Cardiac anomalies (specifically Ventricular Septal Defect - VSD). 2. **Most Specific Anomaly:** **Caudal Regression Syndrome** (Sacral Agenesis). Although rare, it is highly suggestive of maternal diabetes. 3. **Timing:** Congenital anomalies occur during **organogenesis** (first 8 weeks). Therefore, they are primarily associated with **pre-gestational diabetes** (poorly controlled at conception) rather than GDM, which typically develops after 24 weeks. 4. **HbA1c Correlation:** A periconceptional HbA1c >8.5% significantly increases the risk of congenital malformations.

Practice by Chapter

Endocrine Changes in Normal Pregnancy

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Thyroid Disorders in Pregnancy

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Diabetes in Pregnancy

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Adrenal Disorders in Pregnancy

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Pituitary Disorders in Pregnancy

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Hyperemesis Gravidarum

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Hormonal Regulation of Labor

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Pharmacokinetics of Hormones in Pregnancy

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Fetal Endocrine Development

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Placental Hormones

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