What is the recommended time frame for completing a blood transfusion after initiation?
What is the recommended rate of correction for sodium deficit in patients with chronic hyponatremia?
Which of the following is not a feature of distal renal tubular acidosis
Hyperkalemia aciduria is seen in
Graham Steell murmur is associated with which of the following conditions?
Calciphylaxis is a severe life-threatening condition. Which of the following is most commonly associated with it?
What is the primary clinical feature of Henoch-Schonlein purpura?
Interstitial nephritis is common with
A diabetic patient presents with hyperkalemia and urinary pH < 5.5. What is the MOST likely underlying cause?
Deep vein thrombosis most commonly occurs at which site?
NEET-PG 2013 - Internal Medicine NEET-PG Practice Questions and MCQs
Question 111: What is the recommended time frame for completing a blood transfusion after initiation?
- A. 1-4 hours (Correct Answer)
- B. 3-6 hours
- C. 4-8 hours
- D. 8-12 hours
Explanation: ***1-4 hours*** - This timeframe is recommended to **minimize the risk of bacterial growth** in the blood product, as bacteria can multiply quickly at room temperature. - Completing the transfusion within 4 hours also reduces the likelihood of **red blood cell degeneration** and loss of efficacy. *3-6 hours* - This period extends beyond the recommended maximum of 4 hours, increasing the risk of **bacterial proliferation** in the blood product. - Prolonged infusion times can also lead to a **decrease in the viability and function** of transfused cells. *4-8 hours* - Transfusing over 4-8 hours significantly elevates the risk of **bacterial contamination** and potential septic reactions. - The extended duration compromises the **quality and safety** of the blood product. *8-12 hours* - This timeframe is unacceptably long for a blood transfusion, posing a **critical risk of severe bacterial growth** and infection. - Blood products should not be administered beyond 4 hours due to the rapid decline in **cell integrity and increased adverse reaction potential**.
Question 112: What is the recommended rate of correction for sodium deficit in patients with chronic hyponatremia?
- A. 0.5 mmol/hour (Correct Answer)
- B. 1 mmol/hour
- C. 1.5 mmol/hour
- D. 2.0 mmol/hour
Explanation: ***0.5 mmol/hour*** [1] - This rate of correction is recommended to avoid **osmotic demyelination syndrome (ODS)**, also known as central pontine myelinolysis [1]. - The aim is to correct the sodium deficit gradually, with a maximum increase not exceeding **8-10 mmol/L in any 24-hour period** [1]. *1 mmol/hour* - This rate is generally considered too rapid for chronic hyponatremia and increases the risk of **osmotic demyelination syndrome**. - While acceptable in some acute severe cases, it is typically avoided in chronic settings where the brain has adapted to lower osmolality. *1.5 mmol/hour* - This rate would lead to an even faster correction of sodium, significantly elevating the risk of **osmotic demyelination syndrome**. - It would result in a correction of 36 mmol/L over 24 hours, far exceeding the recommended daily limit of 8-10 mmol/L. *2.0 mmol/hour* - Such a rapid correction rate is highly dangerous and almost guarantees the development of **osmotic demyelination syndrome**. - This aggressive correction would lead to severe brain injury due to rapid osmotic shifts.
Question 113: Which of the following is not a feature of distal renal tubular acidosis
- A. Renal hypercalciuria
- B. Normal anion gap
- C. Hyperkalemia (Correct Answer)
- D. Alkaline urine
Explanation: ***Hyperkalemia*** - **Distal renal tubular acidosis (dRTA)** is characterized by impaired acid excretion, leading to metabolic acidosis. The impaired excretion of acid is often accompanied by impaired potassium secretion, resulting in **hypokalemia**, not hyperkalemia. - While hyperkalemia is a feature of **type 4 RTA**, which is characterized by hypoaldosteronism or renal tubular unresponsiveness to aldosterone, it is not a feature of **distal RTA (type 1)**. [1] *Normal anion gap* - **Distal RTA** is a form of **normal anion gap metabolic acidosis**, also known as **hyperchloremic metabolic acidosis**. [1] - The anion gap is calculated as [Na+] - ([Cl-] + [HCO3-]), and in dRTA, the bicarbonate loss is compensated by an increase in chloride, maintaining a normal anion gap. *Renal hypercalciuria* - **Distal RTA** is associated with **impaired acid excretion**, which leads to chronic metabolic acidosis. - This **acidosis** promotes the dissolution of bone, releasing calcium, and decreases tubular reabsorption of calcium, resulting in **hypercalciuria**. *Alkaline urine* - In **distal RTA**, the distal tubule is unable to acidify the urine due to a defect in hydrogen ion secretion. - This leads to a persistent **urine pH > 5.5** (typically alkaline or inappropriately normal) despite systemic acidosis, making it a key diagnostic feature. [1]
Question 114: Hyperkalemia aciduria is seen in
- A. Type I Renal Tubular Acidosis
- B. Type IV Renal Tubular Acidosis (Correct Answer)
- C. Sigmoidocolostomy procedure
- D. Type II Renal Tubular Acidosis
Explanation: Type IV Renal Tubular Acidosis - This condition is characterized by **hyperkalemia** and **aciduria**, often due to a deficiency in aldosterone or a renal tubular insensitivity to aldosterone [1]. - The impaired aldosterone action leads to reduced potassium excretion and decreased ammonium production, both contributing to **hyperkalemia** and metabolic acidosis [1]. *Type I Renal Tubular Acidosis* - Type I RTA (distal RTA) is characterized by a defect in acid secretion in the distal tubule, leading to **hypokalemia** and metabolic acidosis with persistently high urine pH [2]. - Patients typically excrete an alkaline urine despite systemic acidosis, contrasting with the aciduria seen with hyperkalemia [2]. *Sigmoidocolostomy procedure* - A sigmoidocolostomy can lead to **hyperchloremic metabolic acidosis** due to the reabsorption of chloride and excretion of bicarbonate by the colonic mucosa. - However, it typically causes **hypokalemia** as potassium is secreted into the colonic lumen from the blood. *Type II Renal Tubular Acidosis* - Type II RTA (proximal RTA) involves a defect in bicarbonate reabsorption in the proximal tubule, resulting in **hypokalemia** and metabolic acidosis. - The kidney's ability to acidify urine is still largely intact in the distal nephron once the bicarbonate buffer system is overwhelmed.
Question 115: Graham Steell murmur is associated with which of the following conditions?
- A. Pulmonary Regurgitation (PR) (Correct Answer)
- B. Tricuspid Regurgitation (TR)
- C. Tricuspid Stenosis (TS)
- D. Pulmonary Stenosis (PS)
Explanation: ***Pulmonary Regurgitation (PR)*** - The **Graham Steell murmur** is a high-pitched, decrescendo early diastolic murmur heard best at the left sternal border associated with **pulmonary hypertension**. [1] - It results from dilation of the pulmonary artery due to **elevated pulmonary pressures**, leading to functional pulmonary valve regurgitation. [1] *Tricuspid Regurgitation (TR)* - TR typically presents as a **holosystolic murmur** best heard at the left lower sternal border, often increasing with inspiration (Carvallo's sign). - It is caused by improper coaptation of the tricuspid valve leaflets, often due to **right ventricular dilation**. *Tricuspid Stenosis (TS)* - TS is characterized by a **diastolic rumble** heard best at the lower left sternal border, often with an opening snap. [2] - It is relatively rare and often associated with **rheumatic heart disease**. *Pulmonary Stenosis (PS)* - PS typically produces a **systolic ejection murmur** heard at the upper left sternal border, often radiating to the back. - It is caused by **obstruction to blood flow** from the right ventricle to the pulmonary artery.
Question 116: Calciphylaxis is a severe life-threatening condition. Which of the following is most commonly associated with it?
- A. Parathyroidectomy
- B. Medullary carcinoma thyroid
- C. Hyperthyroidism
- D. End stage Renal disease (Correct Answer)
Explanation: ***End stage Renal disease*** - Calciphylaxis frequently occurs in patients with **end-stage renal disease**, primarily associated with **secondary hyperparathyroidism** [1] and **calcium-phosphate imbalance**. - It leads to **cutaneous ischemia** and necrosis, often requiring aggressive management due to its high **mortality rate**. *Parathyroidectomy* - While parathyroidectomy may affect calcium levels, it is not directly linked to calciphylaxis. - Calciphylaxis more commonly develops due to underlying **chronic renal failure** [1] rather than surgical interventions. *Hyperthyroidism* - Hyperthyroidism primarily causes symptoms related to metabolism, **thyroid hormone excess**, and does not lead to calciphylaxis. - There is no direct correlation between hyperthyroid states and the pathophysiology of calciphylaxis. *Medullary carcinoma thyroid* - This condition involves **medullary thyroid carcinoma**, associated with calcitonin production and does not cause calciphylaxis. - Patients typically experience **thyroid-related symptoms** rather than the vascular complications seen in calciphylaxis.
Question 117: What is the primary clinical feature of Henoch-Schonlein purpura?
- A. Abdominal pain due to vasculitis
- B. Joint pain associated with the condition
- C. Kidney involvement in the disease
- D. Skin rash characterized by palpable purpura (Correct Answer)
Explanation: ***Skin rash characterized by palpable purpura*** - **Palpable purpura** is the hallmark cutaneous manifestation of **Henoch-Schonlein purpura (HSP)**, a small-vessel vasculitis [1]. - This rash typically appears on the **lower extremities and buttocks**, reflecting the deposition of IgA in vessel walls [1]. *Abdominal pain due to vasculitis* - While **abdominal pain** is a common feature of HSP due to gastrointestinal vasculitis, it is not considered the primary clinical feature [1]. - Gastrointestinal involvement can manifest with pain, bleeding, and intussusception, but the **skin rash** is more consistently present and diagnostic. *Joint pain associated with the condition* - **Arthralgia** or **arthritis** (joint pain) is seen in a significant number of HSP patients, particularly in the knees and ankles. - However, it is a secondary manifestation, and not the **defining primary sign** of the disease. *Kidney involvement in the disease* - **Renal involvement**, presenting as hematuria and proteinuria, occurs in about one-third of HSP cases and can lead to serious long-term complications. - Despite its significance for prognosis, **kidney disease** is a later and not universally present feature, making the rash the most critical initial diagnostic clue.
Question 118: Interstitial nephritis is common with
- A. Black water fever
- B. Rhabdomyolysis
- C. Tumor lysis syndrome
- D. Nonsteroidal anti-inflammatory drugs (NSAIDs) (Correct Answer)
Explanation: ***Nonsteroidal anti-inflammatory drugs (NSAIDs)*** - **NSAIDs** are a known cause of **acute interstitial nephritis** (AIN), an inflammatory condition affecting the tubules and interstitium of the kidney [1]. - This adverse reaction often manifests as **fever**, **rash**, **eosinophilia**, and **acute kidney injury**, typically 7-10 days after drug exposure. *Black water fever* - **Blackwater fever** is a severe complication of **malaria**, characterized by massive hemolysis leading to **hemoglobinuria**, which darkens the urine. - It primarily causes **acute kidney injury** through **acute tubular necrosis** due to hemoglobin precipitation in the renal tubules, not interstitial nephritis. *Rhabdomyolysis* - **Rhabdomyolysis** involves the breakdown of muscle tissue, releasing myoglobin into the bloodstream, which is toxic to the kidneys. [1] - This condition leads to **acute kidney injury** predominantly through **acute tubular necrosis** due to myoglobin casts obstructing tubules and direct toxicity, not interstitial inflammation. *Tumor lysis syndrome* - **Tumor lysis syndrome** occurs when large numbers of cancer cells are rapidly destroyed, releasing intracellular contents like potassium, phosphate, and nucleic acids. - The high concentration of **uric acid** and **phosphate** in the renal tubules leads to crystal formation, causing **acute kidney injury** primarily through **acute uric acid nephropathy** and **phosphate nephropathy**, rather than interstitial nephritis [1].
Question 119: A diabetic patient presents with hyperkalemia and urinary pH < 5.5. What is the MOST likely underlying cause?
- A. Uremia
- B. Primary hyperaldosteronism
- C. Type IV RTA (Correct Answer)
- D. Type I Renal tubular acidosis
Explanation: ***Type IV RTA*** - Patients with **diabetes mellitus** frequently develop **hyporeninemic hypoaldosteronism**, leading to Type IV RTA [1]. - This condition is characterized by **hyperkalemia** and **acidosis** with a paradoxically low urinary pH (typically < 5.5). *Uremia* - **Uremia** can cause hyperkalemia and acidosis, but it is a broader term for severe kidney failure and not the most specific underlying cause for the given urinary findings. - While patients with uremia can have aciduria, the combination of **diabetic hyperkalemia** and acid urine points more directly to a specific tubular defect. *Primary hyperaldosteronism* - **Primary hyperaldosteronism** is characterized by **hypertension**, **hypokalemia**, and metabolic alkalosis, which is the opposite of the patient's presentation [1]. - This condition involves excessive aldosterone production, leading to increased potassium excretion [1]. *Type I Renal tubular acidosis* - **Type I RTA** (distal RTA) is characterized by the inability to acidify urine, resulting in a **urinary pH > 5.5** despite systemic acidosis [1]. - While it can cause hypokalemia (due to increased distal K+ secretion) and acidosis, the elevated urinary pH is a key differentiating factor from this patient's presentation [1].
Question 120: Deep vein thrombosis most commonly occurs at which site?
- A. Femoral vein (Correct Answer)
- B. Subclavian vein
- C. External jugular vein
- D. Internal jugular vein
Explanation: ***Femoral vein*** - The **femoral vein**, along with the **popliteal** and **iliac veins**, are the most common sites for **deep vein thrombosis (DVT)** in the lower extremities [1]. - Due to their size and the dynamics of blood flow in these regions, they are prone to clot formation, especially in the presence of **Virchow's triad**. *Subclavian vein* - While DVT can occur in the subclavian vein (an **upper extremity DVT**), it is less common than in the lower extremities [1]. - Upper extremity DVTs are often associated with **central venous catheters** or **thoracic outlet syndrome**. *External jugular vein* - **External jugular vein thrombosis** is rare and usually associated with local trauma, infection, or central line placement, not typically primary DVT [1]. - It is a superficial vein and not considered a common site for typical deep vein thrombosis. *Internal jugular vein* - **Internal jugular vein thrombosis** is also uncommon as a primary DVT and often secondary to neck infections, malignancies, or indwelling catheters [1]. - Like the subclavian vein, it's considered an upper extremity DVT site, but less frequent than lower extremity sites.