Endocrinology of Pregnancy Practice Questions

Q: Beta-hCG is secreted by:

Syncytiotrophoblast. ***Syncytiotrophoblast*** - The **syncytiotrophoblast** is the outer layer of the trophoblast that surrounds the blastocyst and later the chorionic villi. - It is responsible for the secretion of various hormones, including **beta-hCG**, which is crucial for maintaining the corpus luteum and pregnancy. *Yolk sac* - The **yolk sac** is involved in early nutrient transfer, hematopoiesis, and germ cell formation. - It does not produce **beta-hCG**. *Liver* - The **liver** is a major organ of metabolism, detoxification, and protein synthesis. - It does not produce **beta-hCG**, which is specific to pregnancy. *Umbilical cord* - The **umbilical cord** connects the fetus to the placenta, facilitating nutrient and oxygen exchange. - It does not have endocrine functions and does not secrete **beta-hCG**.

Q: Corpus luteum in pregnancy is maintained by which hormone?

hCG. ***hCG (Human Chorionic Gonadotropin)*** - **hCG** is produced by the **syncytiotrophoblast** of the developing embryo shortly after implantation - It acts as an **LH analog**, binding to LH receptors on the corpus luteum - hCG **rescues the corpus luteum** from degeneration, maintaining progesterone production throughout early pregnancy - The corpus luteum remains functional until approximately **10-12 weeks of gestation**, when the placenta takes over steroidogenesis - This is the **correct answer** for maintenance of corpus luteum **in pregnancy** *LH (Luteinizing Hormone)* - LH maintains the corpus luteum in **non-pregnant menstrual cycles** for approximately 14 days - In **pregnancy**, LH levels actually **decline** and hCG takes over this function - While LH is responsible for initial corpus luteum formation and function, it does **not** maintain the corpus luteum during pregnancy *FSH (Follicle-Stimulating Hormone)* - FSH primarily stimulates **follicular development and maturation** in the ovary - It has **no direct role** in corpus luteum maintenance in either pregnant or non-pregnant states *Progesterone* - Progesterone is the **product** secreted by the corpus luteum, not the hormone that maintains it - It is essential for maintaining the **decidualized endometrium** and supporting early pregnancy - Progesterone does not act to maintain the corpus luteum itself

Q: A pregnant woman comes to OPD for regular ANC checkup. She gives history of previous child diagnosed with congenital adrenal hyperplasia. What drug is given in this pregnancy to prevent development of CAH in this child?

Dexamethasone. ***Dexamethasone*** - **Dexamethasone** is given to pregnant women with a previous child affected by CAH to help prevent the development of **congenital adrenal hyperplasia** (specifically **21-hydroxylase deficiency**, the most common form) in the fetus. - Treatment must be started **early in pregnancy (ideally before 9 weeks gestation)** to be effective in preventing virilization in affected female fetuses. - **Dexamethasone** crosses the placenta efficiently and suppresses fetal adrenal androgen production, which can reduce or prevent **virilization** in affected female fetuses. - It is the preferred corticosteroid for prenatal treatment due to its ability to cross the placenta without being inactivated. *Hydrocortisone* - **Hydrocortisone** is a glucocorticoid that is often used to replace cortisol in individuals with CAH after birth, but it is not typically used for prenatal prevention. - Its shorter half-life and higher mineralocorticoid activity make it less suitable for transplacental suppression compared to dexamethasone. - Additionally, it does not cross the placenta as effectively as dexamethasone. *Betamethasone* - **Betamethasone** is primarily used in pregnancy to accelerate fetal lung maturation in cases of anticipated preterm birth. - While it is a long-acting corticosteroid that can cross the placenta, it does not have the specific indication or established efficacy for preventing CAH development prenatally. *Prednisolone* - **Prednisolone** is used for various inflammatory and autoimmune conditions, and while it's a corticosteroid, it is largely **inactivated by placental 11β-hydroxysteroid dehydrogenase type 2** before reaching the fetus. - This placental inactivation (approximately 90% is converted to inactive prednisolone) makes it ineffective for suppressing fetal adrenal androgen production to prevent CAH.

Q: In a pregnant woman with hyperemesis gravidarum and abnormal thyroid function tests showing hyperthyroidism, which hormone is likely elevated?

hCG. ***hCG*** - Elevated levels of **human chorionic gonadotropin (hCG)** are strongly associated with **hyperemesis gravidarum** due to its structural similarity to **TSH**. - High hCG can bind to TSH receptors in the thyroid gland, leading to transient but significant **hyperthyroidism**. *Estradiol* - Estrogen levels do increase throughout pregnancy, but elevated **estradiol** is not primarily implicated in the direct cause of hyperemesis gravidarum or the associated transient hyperthyroidism. - While it contributes to pregnancy physiology, there's no direct pathway linking high estradiol to thyroid dysfunction in this context. *Progesterone* - **Progesterone** levels rise steadily during pregnancy to maintain the uterine lining and prevent contractions. - However, progesterone does not directly cause hyperemesis gravidarum or the thyroid function test abnormalities seen in this condition. *TSH* - In a state of **hyperthyroidism**, as suggested by positive thyroid function tests, **TSH (thyroid-stimulating hormone)** levels would typically be **suppressed or low**, not elevated. - The high hCG acts as a TSH mimetic, stimulating the thyroid directly and hence reducing pituitary TSH secretion.

Q: A G1 P0 woman at 36 weeks presents with newly diagnosed gestational diabetes. What is the most appropriate initial management?

Diet control. ***Diet control (Medical Nutrition Therapy)*** - For newly diagnosed gestational diabetes, **lifestyle modifications**, primarily **dietary changes**, are the **first-line treatment** per ACOG and ADA guidelines - Medical nutrition therapy (MNT) aims to control blood glucose levels through proper nutrition and should be attempted for **1-2 weeks** before considering pharmacologic interventions - Target goals: Fasting glucose 4000-4500g), **poor glycemic control despite treatment**, or other maternal-fetal complications - Generally considered at **39-40 weeks** in well-controlled GDM or earlier with complications - Not the initial management for a new diagnosis at 36 weeks without additional concerning features *Oral hypoglycemics* - **Metformin** or **glyburide** may be used as second-line agents when **dietary management fails** to achieve adequate glycemic control after 1-2 weeks - Metformin is increasingly preferred as it does not cross the placenta as readily as glyburide - They are **not the initial step** in management *Insulin* - **Insulin therapy** is indicated when **dietary modifications alone** are insufficient in maintaining target blood glucose levels - Also preferred if oral agents are contraindicated or fail to achieve glycemic targets - Represents a **secondary intervention** when primary non-pharmacological methods are inadequate

Q: In a patient with gestational diabetes, what is the primary goal of dietary management?

Maintain normal blood glucose levels. ***Maintain normal blood glucose levels*** - The primary goal of dietary management in **gestational diabetes** is to achieve and maintain **euglycemia**, thereby preventing adverse maternal and fetal outcomes. - This involves careful monitoring of **carbohydrate intake** and ensuring appropriate timing and distribution of meals to prevent postprandial hyperglycemia. *Weight loss* - While maintaining a healthy weight is beneficial, **weight loss** is generally not recommended during pregnancy, even in gestational diabetes, as it can be detrimental to fetal growth. - The focus is on **weight management** and preventing excessive weight gain, rather than active weight reduction. *Increase protein intake* - While adequate protein intake is crucial for fetal development, an **excessive increase** in protein intake is not the primary dietary goal for managing gestational diabetes. - The focus is on balancing all macronutrients to control **blood glucose**. *Reduce carbohydrate intake* - While **carbohydrate moderation** is critical for blood glucose control, drastically reducing carbohydrate intake can lead to ketosis and may not provide sufficient energy for the mother and fetus. - The goal is to choose **complex carbohydrates** and distribute them appropriately throughout the day, rather than simply reducing them.

Q: Which of the following statements about the placenta is correct?

The placenta produces estrogen.. ***The placenta produces estrogen.*** - The **placenta** is an important endocrine organ, producing various hormones including **estrogen** (specifically estriol) and progesterone. - These hormones are crucial for maintaining the pregnancy and supporting fetal development. *The placental artery carries deoxygenated blood from the fetus to the placenta.* - This statement is incorrect as the **umbilical arteries** (not placental arteries) carry **deoxygenated blood and waste products** from the fetus to the placenta. - The **umbilical vein** carries **oxygenated blood and nutrients** from the placenta to the fetus. *The placenta has 2 arteries and 1 vein.* - This describes the typical composition of the **umbilical cord**, not the placenta itself. - The **placenta** is a distinct organ that connects the mother and fetus, facilitating nutrient and gas exchange. *Wharton's jelly is found in the umbilical cord.* - This statement is correct, but the question asks about the **placenta**, not the umbilical cord. - **Wharton's jelly** is a gelatinous substance that protects and supports the blood vessels within the umbilical cord.

Q: What percentage of cases of complete vesicular mole is associated with theca lutein cysts?

20-40%. ***20-40%*** - **Theca lutein cysts** are benign ovarian cysts that commonly develop in response to excessively high levels of **human chorionic gonadotropin (hCG)**. - In cases of **complete hydatidiform mole**, hCG levels are often very elevated, leading to the development of these cysts in approximately **20-40% of affected women**. *<5%* - This percentage is too low for the incidence of **theca lutein cysts** associated with a complete vesicular mole. - Significant **hCG stimulation** characteristic of molar pregnancies leads to a higher frequency of these ovarian changes compared to normal pregnancies. *5-15%* - While **theca lutein cysts** can occur in pregnancies with high hCG, this range underestimates the prevalence in **complete hydatidiform moles**. - The massive syncytial tissue proliferation in molar pregnancies produces such substantial hCG that the incidence of these cysts is typically considerably higher. *60-70%* - This percentage is too high for the typical incidence of **theca lutein cysts** in complete vesicular moles. - Although the association is significant, it does not occur in the majority of cases; many women with complete moles do not develop clinically relevant theca lutein cysts.

Q: At what weeks of gestation does insulin production begin in a fetus?

8-12 weeks. ***8-12 weeks*** - The **fetal pancreas** begins to develop and differentiate during this period - **Beta cells** differentiate and begin insulin secretion around **9-11 weeks** - While insulin production starts during this timeframe, its levels remain relatively low until later in gestation - This marks the **initiation** of fetal insulin production *4-6 weeks* - This stage is too early for **insulin production**; the pancreas itself is only beginning to form during early organogenesis - The focus during this period is on basic **body plan formation** and early organ development - Beta cell differentiation has not yet begun *14-18 weeks* - By this point, insulin production is **well established** and ongoing - **Fetal insulin** is playing a more significant role in metabolic regulation - Insulin levels are higher than in earlier stages, but the **initiation** of production occurred earlier (8-12 weeks) *24-28 weeks* - At this gestational age, the **fetal pancreas** is well-developed with robust and mature insulin production - Insulin secretion is responsive to glucose levels and plays a key role in **fetal growth** and **fat deposition** - This represents mature regulatory function, not the initiation of insulin production

Q: Up to what gestational age is the corpus luteum essential for pregnancy maintenance, such that its surgical excision would result in miscarriage?

8-10 weeks. ***8-10 weeks*** - The corpus luteum produces **progesterone** that is essential for maintaining early pregnancy until the **luteal-placental shift** occurs. - This shift, where the **placenta takes over progesterone production**, typically completes between **7-9 weeks** of gestation. - However, to ensure safety and account for individual variation, the corpus luteum should be considered essential **up to 10 weeks**. - Surgical excision of the corpus luteum **before 10 weeks** carries significant risk of miscarriage, while removal **after 10 weeks** is generally safe as the placenta has established autonomous progesterone production. *Before 6 weeks* - While removal before 6 weeks would certainly cause miscarriage, this is not the **maximum gestational age** at which the corpus luteum remains essential. - The critical dependency extends well beyond 6 weeks. *6-8 weeks* - During this period, the corpus luteum is still **absolutely essential** for progesterone production. - The luteal-placental shift is typically **incomplete** during this timeframe. - Removal would result in miscarriage, but this is still not the maximum safe window. *10-12 weeks* - By 10-12 weeks, the **placenta has fully taken over** progesterone production. - At this stage, the corpus luteum is no longer functionally necessary, and its removal does **not increase miscarriage risk**.

Question 1

Beta-hCG is secreted by:

Accepted Answer

Syncytiotrophoblast

Answer

Yolk sac

Answer

Liver

Answer

Umbilical cord

Question 2

Corpus luteum in pregnancy is maintained by which hormone?

Accepted Answer

hCG

Answer

LH

Answer

FSH

Answer

Progesterone

Question 3

A pregnant woman comes to OPD for regular ANC checkup. She gives history of previous child diagnosed with congenital adrenal hyperplasia. What drug is given in this pregnancy to prevent development of CAH in this child?

Accepted Answer

Dexamethasone

Answer

Hydrocortisone

Answer

Betamethasone

Answer

Prednisolone

Question 4

In a pregnant woman with hyperemesis gravidarum and abnormal thyroid function tests showing hyperthyroidism, which hormone is likely elevated?

Accepted Answer

hCG

Answer

Estradiol

Answer

Progesterone

Answer

TSH

Question 5

A G1 P0 woman at 36 weeks presents with newly diagnosed gestational diabetes. What is the most appropriate initial management?

Accepted Answer

Diet control

Answer

Induction of labor

Answer

Oral hypoglycemics

Answer

Insulin

Question 6

In a patient with gestational diabetes, what is the primary goal of dietary management?

Accepted Answer

Maintain normal blood glucose levels

Answer

Weight loss

Answer

Increase protein intake

Answer

Reduce carbohydrate intake

Question 7

Which of the following statements about the placenta is correct?

Accepted Answer

The placenta produces estrogen.

Answer

The placenta has 2 arteries and 1 vein.

Answer

The placental artery carries deoxygenated blood from the fetus to the placenta.

Answer

Wharton's jelly is found in the umbilical cord.

Question 8

What percentage of cases of complete vesicular mole is associated with theca lutein cysts?

Accepted Answer

20-40%

Answer

<5%

Answer

5-15%

Answer

60-70%

Question 9

At what weeks of gestation does insulin production begin in a fetus?

Accepted Answer

8-12 weeks

Answer

4-6 weeks

Answer

14-18 weeks

Answer

24-28 weeks

Question 10

Up to what gestational age is the corpus luteum essential for pregnancy maintenance, such that its surgical excision would result in miscarriage?

Accepted Answer

8-10 weeks

Answer

Before 6 weeks

Answer

6-8 weeks

Answer

10-12 weeks

Endocrinology of Pregnancy — MCQs

Endocrinology of Pregnancy — MCQs

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