Endocrinology Practice Questions

Q: A 2-year-old child presented with drowsiness followed by unconsciousness and seizures after missing breakfast. On examination, the child was cold and clammy. What is the most likely diagnosis?

Hypoglycemic seizure. ***Hypoglycemic seizure*** - **Hypoglycemia** is a common cause of seizures and altered consciousness in young children due to their limited glycogen stores and high metabolic rate. - The symptoms of **drowsiness, unconsciousness, and seizures** after missing a meal, along with **cold and clammy skin** (sympathetic response), are classic presentations of severe hypoglycemia affecting brain function. - The acute onset following fasting and rapid progression suggest simple hypoglycemia rather than a chronic metabolic condition. *Inborn error of metabolism* - While inborn errors of metabolism can cause hypoglycemia and seizures, they typically present with recurrent episodes, failure to thrive, developmental delay, or specific metabolic acidosis patterns. - The acute presentation following a missed meal without prior episodes is more consistent with simple hypoglycemia. - IEMs would be considered if there were recurrent episodes or inadequate response to glucose administration. *Diabetic ketoacidosis (DKA)* - DKA typically presents with signs of **hyperglycemia**, such as polyuria, polydipsia, and dehydration, along with metabolic acidosis and ketosis. - While DKA can lead to altered consciousness, it presents with **hyperglycemia** not hypoglycemia, and the clinical picture would include Kussmaul breathing and dehydration. - The cold, clammy skin indicates hypoglycemia rather than the warm, dry skin of DKA. *Uremic encephalopathy due to renal failure* - Uremic encephalopathy is a neurological complication of **severe renal failure**, characterized by a gradual decline in mental status, asterixis, and myoclonus. - This condition would typically have other signs of chronic kidney disease, such as edema, hypertension, growth failure, or abnormal kidney function tests. - The acute presentation following a missed meal does not fit the chronic progressive nature of uremic encephalopathy.

Q: In pediatric endocrinology, for which condition is growth hormone therapy most commonly indicated?

Growth hormone deficiency. ***Growth hormone deficiency*** - **Growth hormone (GH) deficiency** is the primary and most direct indication for GH therapy, as it replaces the missing hormone essential for normal growth. - Diagnosis is made by **stimulation tests** which show insufficient GH secretion, leading to short stature. *Idiopathic short stature* - While GH therapy can be used for **idiopathic short stature** (ISS), it is typically reserved for severe cases where the child's height is significantly below the population norm and there are no identifiable medical causes. - The response to GH therapy in ISS is often less pronounced and more variable than in true GH deficiency. *Turner syndrome* - **Turner syndrome** is a chromosomal disorder (45,X) that causes short stature, for which GH therapy is an approved treatment. - However, the primary indication for GH is **GH deficiency** itself, making it a more fundamental and common reason for therapy. *Constitutional delay of growth and puberty* - **Constitutional delay of growth and puberty** is a variation of normal development where growth and puberty occur later than average. - GH therapy is generally not indicated for this condition, as children eventually reach their normal adult height without intervention, although sometimes **testosterone** or **estrogen** is used to induce puberty.

Q: What is the most effective initial treatment for a child with suspected diabetic ketoacidosis?

Intravenous fluids and insulin. ***Intravenous fluids and insulin*** - **Intravenous fluids** are crucial to correct dehydration and improve renal perfusion, while **insulin** is necessary to reverse the metabolic acidosis and hyperglycemia. - This combined approach rapidly addresses the life-threatening metabolic derangements of **DKA**. *Subcutaneous insulin* - **Subcutaneous insulin** has a slower absorption rate and is not appropriate for the acute management of **DKA**, where rapid action is needed. - It would not sufficiently address the severe **dehydration** and **acidosis** seen in DKA. *Oral rehydration* - Children with **DKA** are often nauseated or vomiting and have impaired consciousness, making **oral rehydration** unreliable and often impossible. - It would not be fast enough to correct severe **dehydration** and metabolic disturbances. *Dialysis* - **Dialysis** is an extreme measure used for severe complications like **renal failure** or certain intoxications, not for the initial management of **DKA**. - There is no indication for **dialysis** in this scenario unless severe **acute kidney injury** unmanageable by fluid resuscitation is present.

Q: A 6-year-old child with growth hormone deficiency is not responding adequately to therapy. Analyze the situation and determine the most likely cause.

Concomitant hypothyroidism. ***Concomitant hypothyroidism*** - **Thyroid hormones** are essential for normal growth and the action of **growth hormone (GH)**. If untreated, **hypothyroidism** can significantly impair growth, even in the presence of adequate GH replacement. - Therefore, in a child with **growth hormone deficiency (GHD)** not responding to therapy, concurrent **hypothyroidism** should always be ruled out and treated. *Poor adherence to treatment* - While a common cause of treatment failure in chronic conditions, the question states the child "is not responding adequately to therapy," implying the therapy is being administered. - This would typically manifest as a lack of response over time, but other physiological causes should be investigated first. *Insufficient dosing* - This is a plausible cause of suboptimal response and would be considered during dose adjustments. - However, **endocrine conditions** like **hypothyroidism** can block the effectiveness of GH even with sufficient dosing. *Incorrect diagnosis* - The question states the child has "growth hormone deficiency," implying this diagnosis has already been established. - While a re-evaluation of the diagnosis may be necessary if other causes are ruled out, it is not the most likely initial cause for lack of response when therapy is being given.

Q: A 10-year-old with growth hormone deficiency on recombinant human growth hormone for one year shows no increase in growth velocity, with compliance confirmed. What is the next best step?

Measure serum IGF-1. ***Measure serum IGF-1*** - Measuring **serum IGF-1 (Insulin-like Growth Factor 1)** is crucial to assess the body's response to recombinant human growth hormone (rhGH) and determine if the current dosage is sufficient. Growth velocity is primarily mediated by IGF-1. - If **IGF-1 levels are low** despite rhGH administration, it suggests either an inadequate dose or a problem with IGF-1 production or action, requiring further investigation or dose adjustment. *Increase rhGH dose* - Increasing the rhGH dose without knowing the **current IGF-1 levels** or growth velocity response could lead to over-treatment or may not address underlying issues if IGF-1 production is already maximal. - While dose adjustment might be needed, it should be guided by **biochemical markers** and clinical response, not done blindly. *Perform insulin tolerance test* - An **insulin tolerance test (ITT)** is a gold standard for diagnosing growth hormone deficiency by stimulating GH release, but the patient is already diagnosed and on treatment. - Performing an ITT in a patient already on rhGH would be **redundant** and potentially dangerous given the risk of hypoglycemia. *Test for anti-GH neutralizing Ab* - **Antibody formation against rhGH** is a rare phenomenon that can lead to treatment failure but is not typically the first step when assessing a lack of growth response. - This test is usually considered in cases of **absolute non-response to escalating doses** of rhGH, after optimizing the dose based on IGF-1 levels.

Q: A child presents with accelerated linear growth and advanced skeletal maturity (bone age). Which underlying condition should be considered?

Hyperthyroidism. ***Hyperthyroidism*** - **Hyperthyroidism** is associated with accelerated metabolism, leading to **advanced skeletal maturation** (bone age ahead of chronological age) due to enhanced bone turnover and increased osteoblastic activity. - Excess thyroid hormone accelerates linear growth velocity and epiphyseal maturation, though this may paradoxically lead to reduced final adult height due to premature growth plate fusion. - Other clinical features include tachycardia, weight loss despite increased appetite, tremors, and behavioral changes. *Congenital hypothyroidism* - **Congenital hypothyroidism** causes the opposite picture: delayed skeletal maturation with bone age significantly behind chronological age. - Reduced thyroid hormone levels lead to generalized slowing of metabolic processes, delayed tooth eruption, and growth retardation. - Classic features include prolonged jaundice, large fontanelles, umbilical hernia, and developmental delay. *Rickets* - **Rickets** results from vitamin D, calcium, or phosphate deficiency, causing defective bone mineralization and softened bones. - It manifests with bone deformities (bowing, rachitic rosary), delayed skeletal maturation, and growth retardation—not advanced bone age. - Biochemical findings include elevated alkaline phosphatase and low serum calcium/phosphate levels. *Growth hormone deficiency* - **Growth hormone deficiency** causes reduced growth velocity and significantly delayed skeletal maturation. - Children present with short stature, delayed bone age, and proportionate body habitus. - It does not cause advanced skeletal maturity; rather, bone age is typically delayed by 2 or more years.

Q: A 6-year-old girl presents with weight loss, excessive hunger, and irritability. A blood test reveals elevated blood glucose levels. What is the most likely diagnosis?

Type 1 Diabetes Mellitus. ***Type 1 Diabetes Mellitus*** - The classic triad of **polyphagia** (excessive hunger), **weight loss**, and elevated blood glucose in a child is highly characteristic of **Type 1 Diabetes Mellitus**. - **Irritability** is a common non-specific symptom associated with uncontrolled hyperglycemia in children. *Type 2 Diabetes Mellitus* - While it involves elevated blood glucose, **Type 2 Diabetes Mellitus** typically occurs in older individuals, often associated with **obesity** and **insulin resistance**. - It usually presents with a more gradual onset and is less commonly associated with significant **weight loss** in children. *Hyperthyroidism* - **Hyperthyroidism** can cause weight loss and increased appetite, but it also presents with other symptoms like **tachycardia**, **tremors**, and **goiter**, which are not mentioned here. - The primary metabolic derangement in hyperthyroidism is **increased metabolism**, not elevated blood glucose due to insulin deficiency. *Cushing Syndrome* - **Cushing Syndrome** is characterized by elevated cortisol levels, leading to **weight gain** (especially truncal obesity), **moon facies**, and **striae**. - While it can cause **hyperglycemia**, the overall clinical picture, particularly the prominent **weight loss**, is inconsistent with Cushing Syndrome.

Question 1

A 14-year-old female presents with polyuria, fatigue, and fruity breath, having lost 5 kg. Her blood glucose is 450 mg/dL, pH is 7.1, bicarbonate is 12 mEq/L, and potassium is 5.8 mEq/L. The ECG shows peaked T waves and a wide QRS complex. Urine ketones are positive. What is the next step in management?

Accepted Answer

Potassium-free fluids + insulin drip

Answer

Sodium bicarbonate infusion

Answer

IV regular insulin bolus

Answer

Calcium gluconate IV push

Question 2

A 2-year-old child presented with drowsiness followed by unconsciousness and seizures after missing breakfast. On examination, the child was cold and clammy. What is the most likely diagnosis?

Accepted Answer

Hypoglycemic seizure

Answer

Inborn error of metabolism

Answer

Diabetic ketoacidosis (DKA)

Answer

Uremic encephalopathy due to renal failure

Question 3

In pediatric endocrinology, for which condition is growth hormone therapy most commonly indicated?

Accepted Answer

Growth hormone deficiency

Answer

Idiopathic short stature

Answer

Turner syndrome

Answer

Constitutional delay of growth and puberty

Question 4

A 9-year-old boy with type 1 diabetes mellitus presents with nausea, vomiting, and abdominal pain. Physical examination reveals fruity breath and Kussmaul breathing. Laboratory results show glucose at 450 mg/dL, decreased bicarbonate, increased anion gap, and elevated ketones. What is the most appropriate immediate management?

Accepted Answer

IV insulin, IV fluids, electrolyte management

Answer

Subcutaneous insulin, oral hydration

Answer

Bicarbonate therapy, IV fluids, ICU admission

Answer

Close monitoring, oral hydration

Question 5

What is the most effective initial treatment for a child with suspected diabetic ketoacidosis?

Accepted Answer

Intravenous fluids and insulin

Answer

Subcutaneous insulin

Answer

Oral rehydration

Answer

Dialysis

Question 6

A 6-year-old child with growth hormone deficiency is not responding adequately to therapy. Analyze the situation and determine the most likely cause.

Accepted Answer

Concomitant hypothyroidism

Answer

Incorrect diagnosis

Answer

Poor adherence to treatment

Answer

Insufficient dosing

Question 7

A 12-year-old boy presents with polyuria, polydipsia, and significant weight loss. His laboratory results reveal a glucose level of 380 mg/dL, increased osmolality, and normal pH. What is the best initial management for this patient with new-onset diabetes and severe hyperglycemia?

Accepted Answer

Subcutaneous insulin + close monitoring for acidosis

Answer

IV insulin + fluids

Answer

Oral antidiabetic agents with lifestyle modification

Answer

IV fluids and subcutaneous insulin

Question 8

A 10-year-old with growth hormone deficiency on recombinant human growth hormone for one year shows no increase in growth velocity, with compliance confirmed. What is the next best step?

Accepted Answer

Measure serum IGF-1

Answer

Increase rhGH dose

Answer

Perform insulin tolerance test

Answer

Test for anti-GH neutralizing Ab

Question 9

A child presents with accelerated linear growth and advanced skeletal maturity (bone age). Which underlying condition should be considered?

Accepted Answer

Hyperthyroidism

Answer

Congenital hypothyroidism

Answer

Rickets

Answer

Growth hormone deficiency

Question 10

A 6-year-old girl presents with weight loss, excessive hunger, and irritability. A blood test reveals elevated blood glucose levels. What is the most likely diagnosis?

Accepted Answer

Type 1 Diabetes Mellitus

Answer

Type 2 Diabetes Mellitus

Answer

Hyperthyroidism

Answer

Cushing Syndrome

Endocrinology — MCQs

Endocrinology — MCQs

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