Endocrinology Practice Questions

Q: What is the best indicator for assessing short-term control of blood glucose levels over a period of 2-3 weeks?

Serum fructosamine. ***Serum fructosamine*** - **Fructosamine** reflects the glycation of serum proteins, primarily albumin, which has a shorter half-life (around 17-20 days) compared to hemoglobin. - This allows it to assess average blood glucose control over the preceding **2-3 weeks**, making it suitable for short-term monitoring. *HbA1c* - **HbA1c** (glycated hemoglobin) reflects average blood glucose levels over the lifespan of red blood cells, typically **2-3 months** [1]. - While an excellent long-term indicator, its longer time frame makes it less suitable for assessing short-term changes over just 2-3 weeks [1]. *Blood sugar* - A single **blood sugar** measurement (fasting or random) provides an instantaneous snapshot of glucose levels at that specific moment [2]. - It does not reflect average glucose control over a period of 2-3 weeks and is highly influenced by recent food intake and activity [2]. *Urine sugar* - **Urine sugar** levels indicate that the kidney's reabsorption capacity for glucose has been exceeded, resulting in glucose spilling into the urine [3]. - This is a qualitative or semi-quantitative measure that primarily reflects very high blood glucose levels and is not a reliable indicator of averaged glucose control over any specific time frame [3].

Q: Female with blood sugar of 600 mg% and sodium of 110 mEq. Insulin was given, what will happen to serum sodium levels ?

Sodium levels may appear to increase. ***Sodium levels may appear to increase*** - The patient's initial presentation with severe hyperglycemia (600 mg%) and hyponatremia (110 mEq/L) suggests **hyperglycemia-induced pseudohyponatremia**. - **Insulin administration** will lower blood glucose, causing water to shift back into the cells from the extracellular space, thereby correcting the dilutional effect and leading to an **apparent increase in serum sodium levels**. *Sodium levels decrease* - This is incorrect because the hyponatremia in this scenario is largely **dilutional** due to hyperglycemia. - As glucose levels decrease with insulin, the osmotic drive for water movement out of cells diminishes, leading to **normalization**, not further decrease, of sodium concentration. *Sodium levels remain unchanged* - This is incorrect because the underlying cause of the initial low sodium is dilution from high glucose. - Once **hyperglycemia is treated**, the osmotic gradient changes, and water shifts, directly impacting and changing the serum sodium concentration. *Relative sodium deficiency may occur* - This option is incorrect because the initial hyponatremia is not primarily due to an absolute lack of sodium in the body but rather a **dilutional effect** caused by the osmotic pull of glucose. - As hyperglycemia resolves, the extracellular fluid becomes less diluted, and the measured sodium concentration will **rise**, not indicate a deficiency.

Q: Most common cause of Addison's Disease in India is:

Tuberculosis. ***Tuberculosis*** - In India, **tuberculosis** is the most common cause of **Addison's disease** due to the high prevalence of TB infections. - Adrenal involvement in TB can lead to gradual destruction of the adrenal cortex, resulting in **adrenal insufficiency**. *Autoimmune* - **Autoimmune adrenalitis** is the leading cause of Addison's disease in developed Western countries. - It involves the destruction of adrenal cortical cells by the body's own immune system, often associated with other autoimmune conditions. *Malignancy* - **Malignancy**, particularly metastatic cancer to the adrenals, can cause adrenal insufficiency but is a less common primary cause of Addison's disease overall. - While possible, it is not the most prevalent cause in India compared to infectious etiologies. *HIV* - **HIV infection** can lead to adrenal dysfunction, but it's typically through opportunistic infections like CMV, cryptococcosis, or direct HIV effects, rather than being the direct cause of widespread adrenal destruction. - It increases the risk of adrenal insufficiency but is not the most common etiology in India for Addison's disease.

Q: What is the recommended postprandial capillary glucose level (in mg/dl) for adequate diabetes control?

< 180 mg/dl. ***< 180 mg/dl*** - This is the **recommended target** for postprandial (1-2 hours after a meal) capillary glucose levels in most non-pregnant adults with diabetes to achieve **adequate glycemic control** [1], [2]. - Maintaining levels below 180 mg/dl helps to minimize the risk of **long-term microvascular and macrovascular complications**. *< 100 mg/dl* - While this is an ideal fasting glucose level, it is generally **too low for postprandial glucose**, and attempting to maintain such levels might increase the risk of **hypoglycemia** in many patients with diabetes [1]. - This target is more appropriate for **fasting or pre-meal glucose** goals. *< 140 mg/dl* - This is a **more stringent target** that may be appropriate for some individuals with diabetes, particularly those who are carefully managed and at low risk of hypoglycemia. - However, for the general population with diabetes, **< 180 mg/dl is the more commonly accepted and achievable goal** for postprandial readings [2]. *< 200 mg/dl* - A postprandial glucose level of < 200 mg/dl is considered **good control** in some contexts, but it's often a **less strict target** than < 180 mg/dl for optimal long-term management. - While better than uncontrolled high levels, consistently approaching 200 mg/dl may still contribute to **increased risk of complications** over time compared to tighter control.

Q: Which type of thyroid cancer is associated with primary hyperparathyroidism and phaeochromocytoma?

Medullary carcinoma of the thyroid. ***Medullary carcinoma of the thyroid*** - Associated with **multiple endocrine neoplasia (MEN) syndrome type 2**, which includes primary hyperparathyroidism and phaeochromocytoma [1]. - Medullary carcinoma arises from **C cells** (parafollicular cells) and is linked with **elevated calcitonin** levels. *Papillary carcinoma of the thyroid* - The most common type of thyroid cancer, but **not associated** with MEN syndromes. - Typically presents as a solitary **nodule** and is linked with **radiation exposure** rather than endocrine syndromes. *Anaplastic carcinoma of the thyroid* - A highly aggressive and undifferentiated form of thyroid cancer, often associated with **poor prognosis**. - Usually arises in older adults and does not have associations with **hyperparathyroidism** or phaeochromocytoma. *Follicular carcinoma of the thyroid* - Characterized by **thyroid follicle formation** and can be associated with **iodine deficiency**, but not with MEN syndromes. - It usually presents as a **solitary thyroid nodule** and lacks connection with **primary hyperparathyroidism**.

Q: What is the primary effect of beta blockers in the management of thyroid storm?

Provides rapid relief of symptoms. Detailed management of thyrotoxic crisis (thyroid storm) is a medical emergency where patients should be given propranolol, either oral or intravenous, to manage life-threatening symptoms [1]. ***Provides rapid relief of symptoms*** - Beta blockers primarily address the **adrenergic manifestations** of thyroid storm, such as **tachycardia**, **tremors**, anxiety, and palpitations [1]. - By blocking **beta-adrenergic receptors**, they provide rapid symptomatic relief and reduce cardiovascular stress, without affecting hormone levels [2]. Thyroid hormones normally increase the expression of genes for beta-adrenergic receptors and G-proteins, leading to increased heart rate and force of contraction [2]. *Increases metabolism of thyroxine* - Beta blockers do not increase the **metabolism** or breakdown of thyroxine; their action is primarily on the **peripheral effects** of thyroid hormones. - While some beta blockers like **propranolol** can inhibit the peripheral conversion of T4 to T3, this is a secondary effect and not their primary role in providing rapid symptomatic relief [1]. *Blocks thyroxine receptors* - Beta blockers do not block **thyroxine receptors**; thyroid hormones exert their effects by binding to intracellular receptors, not adrenergic receptors [2]. - Their action is on the **adrenergic system**, which is overstimulated by the high levels of thyroid hormones. *Decreases synthesis of thyroxine* - Beta blockers do not directly decrease the **synthesis of thyroxine** by the thyroid gland. - That action is performed by **antithyroid drugs** like methimazole and propylthiouracil, which inhibit hormone production [1].

Q: What condition is characterized by a short fourth metacarpal?

Pseudohypoparathyroidism. Pseudohypoparathyroidism - **Pseudohypoparathyroidism** is characterized by end-organ resistance to parathyroid hormone (PTH), leading to hypocalcemia and hyperphosphatemia [2, 4]. - Patients often present with **Albright's hereditary osteodystrophy**, which includes characteristic features like a **shortened fourth metacarpal**, short stature, rounded face, and obesity [2, 4]. *Primary Hyperparathyroidism* - **Primary hyperparathyroidism** involves excessive PTH production from an adenoma or hyperplasia of the parathyroid glands [1, 3, 5]. - This typically leads to **hypercalcemia** and **hypophosphatemia**, and does not involve a short fourth metacarpal as a characteristic feature [1, 3, 5]. *Secondary Hyperparathyroidism* - **Secondary hyperparathyroidism** occurs as a compensatory response to hypocalcemia, often due to chronic kidney disease or vitamin D deficiency [1]. - It’s characterized by elevated PTH levels alongside the underlying cause of hypocalcemia, without the classic skeletal deformities seen in pseudohypoparathyroidism [1, 4]. *Scleroderma* - **Scleroderma** is a chronic autoimmune disease characterized by thickening and hardening of the skin and connective tissues. - It can lead to various complications like Raynaud phenomenon and internal organ fibrosis, but a **short fourth metacarpal is not a feature** of this condition.

Q: A female patient presents with hirsutism, amenorrhea, and obesity. What is the most likely diagnosis?

Polycystic Ovary Syndrome (PCOS). ***Polycystic Ovary Syndrome (PCOS)*** - **Hirsutism**, **amenorrhea** (or oligomenorrhea), and **obesity** are classic clinical features of PCOS, reflecting hyperandrogenism and insulin resistance [2]. - PCOS is a diagnosis of exclusion and involves chronic anovulation and polycystic ovaries on ultrasound [3], though these are not explicitly mentioned, the constellation of symptoms strongly points to it. *Androgen-secreting ovarian tumor* - While it can cause **hirsutism** and **amenorrhea**, the onset is typically **rapid** and severe, with very high androgen levels, and obesity is not a primary feature. - Ovarian tumors are generally less common than PCOS and may present with a palpable mass or specific imaging findings. *Congenital adrenal hyperplasia* - This genetic condition often presents in childhood or adolescence with varying degrees of **virilization** and menstrual irregularities due to enzyme deficiencies in cortisol synthesis [1]. - While it causes **hirsutism** and potentially **amenorrhea**, obesity is not a direct consequence, and the patient's age of presentation and specific symptom pattern are less typical for adult-onset CAH in this context. *Cushing's syndrome* - Characterized by **central obesity**, **moon facies**, **buffalo hump**, **striae**, and proximal muscle weakness due to chronic glucocorticoid excess. - Although it can cause **menstrual irregularities** and mild **hirsutism** [2], the overall clinical picture including the absence of other specific Cushingoid features makes it less likely than PCOS.

Q: Which of the following is not a treatment option for hypercalcemia?

Strontium. ***Strontium*** - **Strontium ranelate** is primarily used in the treatment of **osteoporosis** to promote bone formation and inhibit bone resorption. - It does not have a recognized role in the acute or long-term management of **hypercalcemia** and could potentially worsen it due to its bone-targeting effects if not carefully managed. *Steroids* - **Glucocorticoids** are effective in treating hypercalcemia associated with **granulomatous diseases** (e.g., sarcoidosis) and certain malignancies (e.g., multiple myeloma) by reducing calcitriol production or tumor burden. - They decrease intestinal calcium absorption and increase renal calcium excretion in conditions where 1,25-dihydroxyvitamin D is elevated. *Bisphosphonates* - **Bisphosphonates** (e.g., zoledronic acid, pamidronate) are potent inhibitors of **osteoclast-mediated bone resorption** and are a cornerstone in the treatment of moderate to severe hypercalcemia, especially due to malignancy. [1] - They are administered intravenously and act by inducing osteoclast apoptosis, thereby reducing the release of calcium from bone. [1] *Phosphate* - **Intravenous phosphate** can be used in severe, resistant hypercalcemia, as it promotes calcium deposition into bone and soft tissues, and forms insoluble calcium-phosphate complexes, thus lowering serum calcium. - Its use is limited due to risks of **ectopic calcification**, renal failure, and hypotension, and it is usually reserved for life-threatening situations where other treatments have failed.

Q: Which of the following is a common finding in patients with Syndrome of Inappropriate Antidiuretic Hormone Secretion (SIADH)?

Normal BP. ***Normal BP*** - In SIADH, patients are typically **euvolemic** due to the primary issue being water retention rather than salt retention or frank dehydration [2]. - While hyponatremia occurs, the body's compensatory mechanisms usually prevent significant changes in blood pressure, maintaining it within the **normal range**. *Generalized edema* - Generalized edema is uncommon in SIADH because the excessive water retention is initially within the **intravascular compartment**, and the body attempts to excrete the additional volume of water [1]. - Although the patient is effectively retaining water, the osmolality is low, leading to fluid shifts rather than overt edema unless severe, protracted fluid overload occurs. *Ascites* - **Ascites**, which is the accumulation of fluid in the peritoneal cavity, is not a characteristic feature of SIADH [2]. - Ascites is more commonly associated with conditions like **liver cirrhosis**, heart failure, or malignancy. *Dry mucous membrane* - **Dry mucous membranes** are a sign of dehydration and fluid volume deficit. - In contrast, SIADH involves **fluid overload** (though euvolemic), making dry mucous membranes an unlikely finding [2].

Question 1

What is the best indicator for assessing short-term control of blood glucose levels over a period of 2-3 weeks?

Accepted Answer

Serum fructosamine

Answer

Blood sugar

Answer

Urine sugar

Answer

HbA1c

Question 2

Female with blood sugar of 600 mg% and sodium of 110 mEq. Insulin was given, what will happen to serum sodium levels ?

Accepted Answer

Sodium levels may appear to increase

Answer

Sodium levels decrease

Answer

Sodium levels remain unchanged

Answer

Relative sodium deficiency may occur

Question 3

Most common cause of Addison's Disease in India is:

Accepted Answer

Tuberculosis

Answer

Autoimmune

Answer

HIV

Answer

Malignancy

Question 4

What is the recommended postprandial capillary glucose level (in mg/dl) for adequate diabetes control?

Accepted Answer

< 180 mg/dl

Answer

< 200 mg/dl

Answer

< 100 mg/dl

Answer

< 140 mg/dl

Question 5

Which type of thyroid cancer is associated with primary hyperparathyroidism and phaeochromocytoma?

Accepted Answer

Medullary carcinoma of the thyroid

Answer

Papillary carcinoma of the thyroid

Answer

Anaplastic carcinoma of the thyroid

Answer

Follicular carcinoma of the thyroid

Question 6

What is the primary effect of beta blockers in the management of thyroid storm?

Accepted Answer

Provides rapid relief of symptoms

Answer

Increases metabolism of thyroxine

Answer

Blocks thyroxine receptors

Answer

Decreases synthesis of thyroxine

Question 7

What condition is characterized by a short fourth metacarpal?

Accepted Answer

Pseudohypoparathyroidism

Answer

Primary Hyperparathyroidism

Answer

Secondary Hyperparathyroidism

Answer

Scleroderma

Question 8

A female patient presents with hirsutism, amenorrhea, and obesity. What is the most likely diagnosis?

Accepted Answer

Polycystic Ovary Syndrome (PCOS)

Answer

Androgen-secreting ovarian tumor

Answer

Congenital adrenal hyperplasia

Answer

Cushing's syndrome

Question 9

Which of the following is not a treatment option for hypercalcemia?

Accepted Answer

Strontium

Answer

Bisphosphonates

Answer

Steroids

Answer

Phosphate

Question 10

Which of the following is a common finding in patients with Syndrome of Inappropriate Antidiuretic Hormone Secretion (SIADH)?

Accepted Answer

Normal BP

Answer

Ascites

Answer

Generalized edema

Answer

Dry mucous membrane

Endocrinology — MCQs

Endocrinology — MCQs

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