Endocrinology Practice Questions

Q: For FITTER, what is the shortest needle length in mm that should be used?

4. The **FITTER (Forum for Injection Technique and Therapy Expert Recommendations)** guidelines emphasize that the primary goal of insulin injection is to deliver the drug into the **subcutaneous (SC) space** while avoiding accidental **intramuscular (IM)** injection. **1. Why 4 mm is the correct answer:** The human skin (epidermis and dermis) thickness at injection sites rarely exceeds 2.5 mm, regardless of BMI, age, or ethnicity. A **4 mm needle** is the shortest available length and is considered the **gold standard** for all patients (including obese individuals). It is long enough to pass through the skin into the SC tissue but short enough to significantly reduce the risk of painful IM injections, which can cause unpredictable glucose fluctuations and hypoglycemia. **2. Why the other options are incorrect:** * **5 mm & 6 mm:** While these were previously common, they increase the risk of IM injection, especially in children, thin adults, or when injecting into the limbs. * **8 mm:** This length is now largely discouraged for routine insulin therapy. Using an 8 mm needle often requires a skin fold (pinch-up) technique to avoid the muscle, increasing the complexity of the injection and the risk of needle-stick injuries. **High-Yield Clinical Pearls for NEET-PG:** * **Site Rotation:** Essential to prevent **Lipohypertrophy**, which can delay insulin absorption. * **No Pinch Technique:** With a 4 mm needle, a 90-degree insertion without a skin fold is recommended for most adults. * **IM Injection Risk:** Insulin absorbed from muscle acts much faster than SC insulin, leading to severe, unexplained hypoglycemia. * **Single Use:** Needles should not be reused as it causes microscopic "barbing," leading to tissue trauma and lipohypertrophy.

Q: Which of the following is NOT a feature of primary hyperaldosteronism?

Pedal edema. Primary hyperaldosteronism (Conn’s syndrome) is characterized by the autonomous overproduction of aldosterone, leading to sodium retention and potassium excretion [1]. **Why Pedal Edema is NOT a feature (The "Aldosterone Escape" Phenomenon):** Despite significant sodium and water retention, patients with primary hyperaldosteronism **do not** typically develop pedal edema. This is due to the **"Aldosterone Escape"** mechanism [1]. As intravascular volume expands, the body compensates by increasing the secretion of **Atrial Natriuretic Peptide (ANP)** and increasing the pressure natriuresis in the kidneys. This results in the excretion of excess sodium and water, preventing the formation of overt edema and limiting the severity of hypernatremia [1]. **Analysis of Incorrect Options:** * **Diastolic Hypertension:** Aldosterone increases sodium reabsorption in the distal tubules, leading to volume expansion and increased peripheral resistance, which characteristically raises diastolic blood pressure. * **Polyuria:** Chronic hypokalemia causes **nephrogenic diabetes insipidus** (resistance to ADH), leading to the inability to concentrate urine, resulting in polyuria and nocturia. * **Hypokalemia:** Aldosterone promotes potassium secretion in the cortical collecting duct [1]. While 20-40% of patients may be normokalemic, hypokalemia remains a classic hallmark, often exacerbated by thiazide diuretics [1]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Screening Test:** Plasma Aldosterone Concentration (PAC) to Plasma Renin Activity (PRA) ratio. A **PAC:PRA ratio > 20-30** is highly suggestive. 2. **Confirmatory Test:** Saline infusion test or Oral salt loading test. 3. **Metabolic State:** Patients typically exhibit **Hypokalemic Metabolic Alkalosis** [1]. 4. **Treatment:** Surgical excision for unilateral adenoma; **Spironolactone** or Eplerenone (Aldosterone antagonists) for bilateral adrenal hyperplasia.

Q: Common neurological manifestations of thyrotoxicosis include all except?

Chorea. Thyrotoxicosis (excess thyroid hormone) significantly impacts the neuromuscular system by increasing metabolic rate and enhancing beta-adrenergic sensitivity. [2] **Why Chorea is the Correct Answer (The Exception):** While thyrotoxicosis can cause various movement disorders, **Chorea is a rare manifestation**, not a "common" one. It is typically seen in specific cases like Graves' disease (possibly due to autoimmune mechanisms or hypersensitivity of dopamine receptors in the basal ganglia) but is not a routine clinical finding compared to the other options. **Analysis of Other Options:** * **A. Hyperreflexia:** This is a hallmark sign. Excess thyroid hormone shortens the contraction and relaxation phases of deep tendon reflexes, leading to "brisk" reflexes. * **B. Muscle Wasting:** Chronic thyrotoxicosis leads to a catabolic state where protein breakdown exceeds synthesis, resulting in visible muscle wasting, particularly in the shoulder and pelvic girdles. [1] * **D. Proximal Myopathy without Fasciculations:** Thyrotoxic myopathy characteristically affects proximal muscles (difficulty climbing stairs or combing hair). [1] Crucially, unlike lower motor neuron diseases (e.g., ALS), it occurs **without fasciculations**, making this a classic clinical description. **High-Yield Clinical Pearls for NEET-PG:** * **Thyroid Storm:** Look for extreme hyperthermia, tachycardia, and altered mental status (delirium/coma). * **Hypokalemic Periodic Paralysis:** A rare but high-yield neurological complication of thyrotoxicosis, more common in Asian males, characterized by sudden muscle weakness after high-carb meals or exercise. * **Tremors:** The tremor in thyrotoxicosis is typically high-frequency, low-amplitude, and fine (best seen by placing a sheet of paper on outstretched hands). [2]

Q: Which of the following is associated with secondary hyperparathyroidism?

Chronic renal failure. **Explanation:** **1. Why Chronic Renal Failure (CRF) is correct:** Secondary hyperparathyroidism is a compensatory hypersecretion of Parathyroid Hormone (PTH) in response to prolonged **hypocalcemia** [1]. In Chronic Renal Failure, two main mechanisms trigger this [2]: * **Hyperphosphatemia:** Failing kidneys cannot excrete phosphate. High phosphate levels directly stimulate PTH and bind ionized calcium [3]. * **Vitamin D Deficiency:** The kidneys fail to convert 25-OH Vitamin D into its active form, **1,25-(OH)₂ Vitamin D (Calcitriol)**. This leads to decreased intestinal calcium absorption [1], [5]. The parathyroid glands undergo diffuse hyperplasia to secrete more PTH in an attempt to normalize serum calcium levels [2]. **2. Why the other options are incorrect:** * **A. Parathyroid Adenoma:** This is the most common cause of **Primary** hyperparathyroidism, where the gland autonomously overproduces PTH regardless of calcium levels [1], [4]. * **B. Marked Hypercalcemia:** Secondary hyperparathyroidism is characterized by **low or low-normal calcium** [3]. If calcium becomes high in a patient with long-standing secondary hyperparathyroidism, it suggests progression to **Tertiary hyperparathyroidism** (autonomous secretion) [2]. * **D. Parathyroidectomy:** This is the definitive treatment for Primary or Tertiary hyperparathyroidism [4]. In Secondary hyperparathyroidism, the management focuses on treating the underlying cause (e.g., phosphate binders, Vitamin D analogues, or cinacalcet). **3. High-Yield Clinical Pearls for NEET-PG:** * **Primary Hyperparathyroidism:** High PTH, High Calcium, Low Phosphate [1]. * **Secondary Hyperparathyroidism:** High PTH, **Low/Normal Calcium**, High Phosphate (in CRF) [3]. * **Tertiary Hyperparathyroidism:** Very High PTH, **High Calcium** (seen after long-term CRF or post-renal transplant) [2]. * **Radiological Hallmark:** Subperiosteal bone resorption (most common in the phalanges).

Q: Ocular Graves disease is associated with which of the following thyroid states?

All of the above. Graves' Ophthalmopathy (Thyroid-Associated Ophthalmopathy) is an autoimmune inflammatory disorder where antibodies (primarily TSH-receptor antibodies or TRAb) react against antigens in the retro-orbital tissues [1]. This leads to inflammation of extraocular muscles and increased orbital fat [3]. While Graves' ophthalmopathy is most commonly associated with **Hyperthyroidism** (approx. 80-90% of cases), it is an independent autoimmune process. Therefore, the clinical manifestation of eye disease does not always mirror the metabolic state of the thyroid gland: * **Hyperthyroidism:** Most patients have overt thyrotoxicosis at the time of eye symptom onset [3]. * **Euthyroid State:** Known as "Euthyroid Graves' Disease," some patients have significant ocular involvement without any biochemical evidence of thyroid dysfunction [1]. * **Hypothyroidism:** It can occur in patients with primary hypothyroidism (Hashimoto’s thyroiditis) who possess TSH-receptor stimulating antibodies. Options A, B, and C are incorrect only because they are incomplete. Selecting only "Hyperthyroidism" ignores the significant subset of patients who present with ocular symptoms while being euthyroid or hypothyroid. * **Most common cause** of both bilateral and unilateral proptosis in adults is Graves' Disease [3]. * **Smoking** is the strongest modifiable risk factor for the progression of ophthalmopathy. * **Radioactive Iodine (RAI) therapy** can potentially worsen the ophthalmopathy; steroids are often co-administered to prevent this. * **Order of muscle involvement (Mnemonic: I'M SLow):** Inferior rectus > Medial rectus > Superior rectus > Lateral rectus. * **Treatment:** Selenium (mild cases), IV Glucocorticoids (moderate-to-severe), and Orbital decompression (sight-threatening/dysthyroid optic neuropathy) [2].

Q: Which of the following drugs does NOT induce diabetes mellitus?

Beta blockers. **Explanation:** The correct answer is **Beta-blockers**. While beta-blockers (especially non-selective ones like Propranolol) are known to cause **dysglycemia** and can mask the symptoms of hypoglycemia, they are generally considered to have a "neutral" or slightly negative effect on glucose metabolism compared to the other options. Crucially, in the context of NEET-PG questions, they are often the "least likely" to *induce* de novo Diabetes Mellitus compared to potent diabetogenic drugs like Thiazides or Protease Inhibitors. *Note: While some studies link older beta-blockers to increased insulin resistance, newer vasodilatory beta-blockers (e.g., Carvedilol, Nebivolol) are metabolic-neutral.* **Why the other options are wrong:** * **Protease Inhibitors (e.g., Ritonavir, Indinavir):** These are notorious for causing **metabolic syndrome**, including lipodystrophy, dyslipidemia, and significant insulin resistance leading to New-Onset Diabetes After Transplantation (NODAT) or HIV-associated diabetes [1]. * **Antipsychotics (Atypical/Second Generation):** Drugs like **Clozapine and Olanzapine** cause profound weight gain and metabolic derangements, directly increasing the risk of Type 2 Diabetes. * **Thiazide Diuretics:** These induce hyperglycemia by causing **hypokalemia**, which inhibits the release of insulin from pancreatic beta cells. **High-Yield Clinical Pearls for NEET-PG:** 1. **Drug-Induced Diabetes Mnemonic (S-P-A-T):** **S**teroids (most common), **P**rotease inhibitors, **A**typical antipsychotics, **T**hiazides. 2. **Steroids:** Increase gluconeogenesis and cause peripheral insulin resistance. 3. **Phenytoin:** Can also cause hyperglycemia by inhibiting insulin release. 4. **Cyclosporine/Tacrolimus:** Common causes of post-transplant diabetes mellitus.

Question 1

In which of the following conditions is intensive management of diabetes mellitus NOT needed?

Accepted Answer

Diabetes mellitus with acute myocardial infarction

Answer

Autonomic neuropathy causing postural hypotension

Answer

Pregnancy

Answer

Post kidney transplant in a diabetic patient with nephropathy

Question 2

For FITTER, what is the shortest needle length in mm that should be used?

Accepted Answer

4

Answer

5

Answer

6

Answer

8

Question 3

Which of the following is NOT a feature of primary hyperaldosteronism?

Accepted Answer

Pedal edema

Answer

Diastolic hypertension

Answer

Polyuria

Answer

Hypokalemia

Question 4

Common neurological manifestations of thyrotoxicosis include all except?

Accepted Answer

Chorea

Answer

Hyperreflexia

Answer

Muscle wasting

Answer

Proximal myopathy without fasciculations

Question 5

Which of the following statements is true about hypercalcemia?

Accepted Answer

Amidronate is not effective

Answer

Treatment of the primary cause

Answer

Malignancy does not produce hypercalcemia

Answer

IV fluids with furosemide are given

Question 6

Which of the following is associated with secondary hyperparathyroidism?

Accepted Answer

Chronic renal failure

Answer

Parathyroid adenoma

Answer

Marked hypercalcemia

Answer

Parathyroidectomy relieves the symptoms

Question 7

Ocular Graves disease is associated with which of the following thyroid states?

Accepted Answer

All of the above

Answer

Hyperthyroidism

Answer

Hypothyroidism

Answer

Euthyroid state

Question 8

Which of the following drugs does NOT induce diabetes mellitus?

Accepted Answer

Beta blockers

Answer

Protease inhibitors

Answer

Antipsychotics

Answer

Thiazide diuretics

Question 9

All are symptoms of hyperglycemia in a diabetic patient except?

Accepted Answer

Weight gain

Answer

Polyuria

Answer

Fatigue

Answer

Recurrent skin infections

Question 10

Which of the following is a feature of metabolic syndrome?

Accepted Answer

Hyperinsulinemia

Answer

Hypoinsulinemia

Answer

High HDL cholesterol

Answer

Type 1 diabetes mellitus

Endocrinology — MCQs

Endocrinology — MCQs

On this page

Practice by Chapter

Want unlimited practice?