Endocrinology Practice Questions

Q: Which of the following is NOT a cause of fasting hypoglycemia?

Chronic pancreatitis. ***Chronic pancreatitis*** - This condition primarily affects the **exocrine function of the pancreas**, leading to malabsorption and, in later stages, often **diabetes mellitus** due to islet cell destruction [1]. - While it can lead to **pancreatic insufficiency**, it is not typically a cause of **fasting hypoglycemia**; rather, it often causes hyperglycemia [1]. *Alcohol intake* - **Ethanol metabolism** can inhibit gluconeogenesis in the liver, especially when **glycogen stores are depleted**, leading to **hypoglycemia**. - This is a common cause of **fasting hypoglycemia**, particularly in individuals with poor nutrition. *Pentamidine therapy* - **Pentamidine**, used to treat *Pneumocystis jiroveci* pneumonia, can cause **direct toxicity to pancreatic beta cells**, leading to acute **insulin release** and subsequent hypoglycemia. - While long-term use can lead to **beta-cell destruction** and diabetes, its acute effect is often **severe hypoglycemia**. *Renal insufficiency* - **Kidney failure** can lead to hypoglycemia through several mechanisms, including **reduced renal gluconeogenesis** and decreased insulin clearance. - The kidneys play a significant role in **insulin degradation** and glucose production, so impaired function can result in **prolonged insulin levels** and lower blood glucose.

Q: Which of the following is a common presentation of acute adrenal insufficiency?

Abdominal pain, fatigue, and hypotension. ***Abdominal pain, fatigue, and hypotension*** - **Acute adrenal insufficiency** often presents with a constellation of symptoms including **severe abdominal pain**, profound **fatigue**, and **hypotension** due to the sudden lack of cortisol and aldosterone [1]. - The abdominal pain can be mimic an **acute abdomen**, while profound fatigue and **hypotension** are directly linked to the body's inability to maintain vascular tone and electrolyte balance without proper adrenal hormones [1]. *Severe fatigue and weakness* - While **severe fatigue** and **weakness** are prominent symptoms of adrenal insufficiency, this option is incomplete as it misses other critical clinical signs like **hypotension** and **GI symptoms** that characterize the acute presentation. - These symptoms alone could be indicative of numerous other conditions, making them not specific enough for **acute adrenal insufficiency** compared to the more comprehensive answer choice. *Hypotension and shock* - **Hypotension** and progression to **shock** are indeed critical and life-threatening features of **acute adrenal insufficiency** [1]. - However, this option does not include other key clinical manifestations such as **abdominal pain** and **fatigue**, which are commonly present and help in diagnosis before full shock develops [1]. *None of the options* - This option is incorrect because the first option accurately describes the **common and critical presentation** of acute adrenal insufficiency by including the most salient symptoms. - The combination of **abdominal pain**, **fatigue**, and **hypotension** is highly characteristic of this medical emergency [1].

Q: Metabolic syndrome diagnosis in men based on NCEP ATP III criteria includes the following except:

HDL 40 inches* - **Abdominal obesity**, defined as a **waist circumference > 40 inches (102 cm)** in men, is indeed one of the NCEP ATP III criteria for metabolic syndrome. - This criterion reflects **visceral adiposity**, which is strongly associated with insulin resistance and cardiovascular risk. *BP >/= 130/85 mm Hg* - This **blood pressure** threshold is a correct criterion for diagnosing metabolic syndrome in both men and women by NCEP ATP III. - It signifies **elevated blood pressure**, a key component of the syndrome contributing to cardiovascular risk. *Fasting glucose > 110 mg/dL* - An **elevated fasting plasma glucose** of **≥ 110 mg/dL** is a correct NCEP ATP III criterion for metabolic syndrome. - This indicates **impaired fasting glucose** or **insulin resistance**, a core feature of metabolic syndrome.

Q: What is the HbA1C criteria for a patient to be diagnosed with diabetes mellitus?

6.5%. ***6.5%*** - An HbA1C level of **6.5% or higher** is the diagnostic threshold for **diabetes mellitus** according to major international guidelines [1]. - This value reflects an average blood glucose level over the preceding **two to three months**, indicating chronic hyperglycemia [1]. *5.5%* - An HbA1C of 5.5% falls within the **normal range** for individuals without diabetes or prediabetes [1]. - It does not indicate impaired glucose regulation or diabetes. *4.5%* - An HbA1C of 4.5% is considered a **very good** or **low-normal** value, indicating excellent blood glucose control. - This level is far below the threshold for diagnosing diabetes. *7.5%* - While 7.5% is indicative of diabetes, it is **higher** than the diagnostic cutoff. - An HbA1C of 7.5% or more would suggest **poorly controlled diabetes** rather than just meeting the diagnostic criteria.

Q: In which condition is a hypotonic solution administered for correction?

Hyperosmolar hyperglycemic state (HHS). ***Hyperosmolar hyperglycemic state (HHS)*** - In **HHS**, patients have severe **hyperglycemia** and **hyperosmolality**, leading to significant dehydration and intracellular fluid shifts. - Administering a **hypotonic solution** (e.g., 0.45% saline) helps to gradually lower serum osmolality and **rehydrate cells**, correcting both the fluid deficit and the hypertonic state [2], [4]. *Dehydration secondary to diuretic therapy* - This typically involves **isotonic or hypotonic fluid loss**, and administering a hypotonic solution could exacerbate **hyponatremia** or fluid overload. - Treatment usually focuses on replacing lost volume with **isotonic fluids** and addressing the underlying electrolyte imbalances. *Diabetic ketoacidosis (DKA)* - Initial fluid resuscitation in **DKA** typically involves **isotonic saline** (e.g., 0.9% NaCl) to expand the extracellular volume and restore perfusion [1], [2]. - While DKA eventually requires free water, a hypotonic solution is not the initial or primary fluid for correction of the acute phase due to significant fluid and electrolyte deficits [1]. *Hypotonic dehydration* - In **hypotonic dehydration**, there's a greater loss of sodium than water, leading to **hyponatremia** [3]. - Administering a **hypotonic solution** would worsen the already low serum sodium concentration, which can be dangerous [3].

Q: Which of the following causes of hypercalcemia is not associated with high bone turnover?

Thiazides. ***Thiazides*** - Thiazide diuretics cause hypercalcemia by increasing **renal reabsorption of calcium** in the distal tubule [1], not by stimulating bone breakdown. - This effect leads to a higher serum calcium concentration without an increase in **bone turnover markers**. *Hyperthyroidism* - Excessive thyroid hormone can directly stimulate **osteoclast activity**, leading to increased bone resorption and high bone turnover. - This results in a net release of calcium from the bone into the bloodstream, contributing to hypercalcemia. *Vitamin D intoxication* - Excess vitamin D drastically increases intestinal absorption of calcium and phosphate [1], as well as stimulating **osteoclastic bone resorption** [3], thereby increasing bone turnover. - This leads to significant elevation of serum calcium levels [3]. *Vitamin A intoxication* - Chronic excessive intake of Vitamin A can lead to bone toxicity, promoting **osteoclastogenesis** and osteoclastic bone resorption [2]. - This process directly contributes to increased bone turnover and subsequent hypercalcemia [2].

Q: Which drug is used for the medical management of acromegaly due to small pituitary tumors?

Octreotide. ***Octreotide*** - **Octreotide** is a **somatostatin analog** and the **first-line medical therapy** for acromegaly. - It effectively suppresses **growth hormone (GH)** and **IGF-1** secretion by binding to somatostatin receptors (especially SSTR2 and SSTR5) on pituitary adenomas. - Normalizes IGF-1 levels in **50-70%** of patients and can reduce tumor size. - Used for small or large tumors when surgery is not feasible, has failed, or as primary medical management. *Cabergoline* - **Cabergoline** is a **dopamine agonist** with limited efficacy in acromegaly. - Controls GH/IGF-1 in only **10-20%** of patients, primarily those with **co-secretion of prolactin** (mixed GH-PRL adenomas). - May be used as **adjunctive therapy** with somatostatin analogs but is not first-line treatment. *Pegvisomant* - **Pegvisomant** is a **GH receptor antagonist** that blocks GH action at the tissue level. - Highly effective at normalizing **IGF-1** levels (**>90%** of patients). - Used as **second-line therapy** when somatostatin analogs fail or are insufficient. - Does not reduce tumor size or GH secretion directly. *Vigabatrin* - **Vigabatrin** is an **antiepileptic drug** that inhibits GABA transaminase. - Has no role in the treatment of acromegaly or pituitary tumors.

Q: Patchy hair loss with velvety skin points to the diagnosis of which of the following conditions?

Cushing's syndrome. Cushing's syndrome - Patchy hair loss (alopecia) and velvety skin (acanthosis nigricans) are characteristic cutaneous manifestations seen in Cushing's syndrome due to excess glucocorticoids [2]. - Hyperandrogenism, often associated with Cushing's, can contribute to hair thinning in affected areas [2]. Alopecia areata - Characterized by well-demarcated, smooth patches of hair loss on the scalp or body [1], but typically does not present with velvety skin. - It is an autoimmune condition where the immune system attacks hair follicles. Trichotillomania - Involves compulsive hair pulling, leading to irregular patches of hair loss with hairs of varying lengths [1]. - The skin beneath the affected areas is typically normal and does not exhibit a velvety texture. Adenoma sebaceum - These are angiofibromas (small, red bumps) primarily found on the face, particularly around the nose and cheeks, and are associated with tuberous sclerosis. - They do not typically cause widespread patchy hair loss or generalized velvety skin.

Q: The Z score measures bone mineral density compared to the average of which group of individuals?

Individuals matched for age, race, and sex. ***Individuals matched for age, race, and sex*** - A **Z-score** compares a patient's **bone mineral density (BMD)** to the average BMD of a healthy, age-matched, sex-matched, and race-matched population. - It is particularly useful in premenopausal women, men under 50 years of age, and children to help diagnose **secondary osteoporosis**. *Individuals matched for race and sex* - This definition is incomplete as it omits matching for **age**, which is a crucial demographic factor influencing bone density. - Without age-matching, the comparison would not accurately reflect expected bone density for the patient's specific life stage. *Individuals matched for sex* - This is an insufficient comparison for **bone mineral density**, as it excludes critical demographic factors like **age** and **race**. - Bone density naturally varies significantly with age and can also differ across racial groups. *None of the options* - This option is incorrect because the first option accurately describes the reference population for a **Z-score**. - The **Z-score** is a clearly defined metric in bone densitometry with a specific reference group.

Q: Poorly controlled diabetes with blood sugar of 450 mg% is associated with:

Hypokalemia. **Hypokalemia** - **Insulin deficiency** in uncontrolled diabetes leads to an **extracellular shift of potassium** because insulin facilitates potassium entry into cells [1]. - **Diabetic ketoacidosis (DKA)**, a common complication of uncontrolled diabetes, causes significant **renal potassium loss** due to osmotic diuresis and vomiting, even if serum potassium appears normal or high initially [1], [2]. *Hyponatremia* - **Hyperglycemia** can cause **pseudohyponatremia** due to the osmotic effect of high glucose drawing water from cells into the extracellular space, diluting serum sodium [1]. - In severe cases, the true sodium might be low, but the initial effect is dilutional, not a deficit of sodium [1]. *Hypernatremia* - Mild hypernatremia can occur due to **osmotic diuresis** causing significant water loss, but this is less common than dilutional hyponatremia or normal sodium levels. - The primary effect of hyperglycemia on sodium is usually related to dilution rather than an absolute increase in sodium concentration. *Hypomagnesemia* - While diabetic patients can develop **hypomagnesemia** over time due to increased urinary excretion, it is not the most immediate or direct metabolic derangement associated with acute, poorly controlled hyperglycemia (blood sugar 450 mg/dL). - **Hypomagnesemia** is often a chronic complication due to long-term renal losses rather than an acute consequence of severe hyperglycemia.

Question 1

Which of the following is NOT a cause of fasting hypoglycemia?

Accepted Answer

Chronic pancreatitis

Answer

Pentamidine therapy

Answer

Renal insufficiency

Answer

Alcohol intake

Question 2

Which of the following is a common presentation of acute adrenal insufficiency?

Accepted Answer

Abdominal pain, fatigue, and hypotension

Answer

Severe fatigue and weakness

Answer

Hypotension and shock

Answer

None of the options

Question 3

Metabolic syndrome diagnosis in men based on NCEP ATP III criteria includes the following except:

Accepted Answer

HDL < 50 mg / dL

Answer

Fasting glucose > 110 mg/dL

Answer

Abdominal obesity > 40 inches

Answer

BP >/= 130/85 mm Hg

Question 4

What is the HbA1C criteria for a patient to be diagnosed with diabetes mellitus?

Accepted Answer

6.5%

Answer

5.5%

Answer

4.5%

Answer

7.5%

Question 5

In which condition is a hypotonic solution administered for correction?

Accepted Answer

Hyperosmolar hyperglycemic state (HHS)

Answer

Dehydration secondary to diuretic therapy

Answer

Hypotonic dehydration

Answer

Diabetic ketoacidosis

Question 6

Which of the following causes of hypercalcemia is not associated with high bone turnover?

Accepted Answer

Thiazides

Answer

Hyperthyroidism

Answer

Vitamin D intoxication

Answer

Vitamin A intoxication

Question 7

Which drug is used for the medical management of acromegaly due to small pituitary tumors?

Accepted Answer

Octreotide

Answer

Vigabatrin

Answer

Pegvisomant

Answer

Cabergoline

Question 8

Patchy hair loss with velvety skin points to the diagnosis of which of the following conditions?

Accepted Answer

Cushing's syndrome

Answer

Trichotillomania

Answer

Adenoma sebaceum

Answer

Alopecia areata

Question 9

The Z score measures bone mineral density compared to the average of which group of individuals?

Accepted Answer

Individuals matched for age, race, and sex

Answer

Individuals matched for race and sex

Answer

Individuals matched for sex

Answer

None of the options

Question 10

Poorly controlled diabetes with blood sugar of 450 mg% is associated with:

Accepted Answer

Hypokalemia

Answer

Hyponatremia

Answer

Hypernatremia

Answer

Hypomagnesemia

Endocrinology — MCQs

Endocrinology — MCQs

On this page

Practice by Chapter

Want unlimited practice?