Extracorporeal Removal Techniques Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Extracorporeal Removal Techniques. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Extracorporeal Removal Techniques Indian Medical PG Question 1: Protective level of Tetanus anti-toxin is:
- A. >0.01 IU/mL (Correct Answer)
- B. >0.5 IU/mL
- C. >5 IU/mL
- D. >1.0 IU/mL
Extracorporeal Removal Techniques Explanation: ***>0.01 IU/mL***
- A serum level of antibodies **greater than 0.01 IU/mL** is generally considered the **minimum protective level** against tetanus.
- This threshold indicates sufficient immunity to prevent clinical tetanus, though higher levels offer an increased margin of protection.
*>0.5 IU/mL*
- While levels **above 0.5 IU/mL** indicate strong, long-lasting protection, they are not the minimum protective threshold.
- This level is often considered indicative of **excellent immunity** that may last for many years.
*>5 IU/mL*
- A level of **5 IU/mL** or higher signifies a very high antibody titer, far exceeding the basic protective level.
- This level is not the standard for basic protection and often seen after **recent vaccination** or booster.
*>1.0 IU/mL*
- Levels **above 1.0 IU/mL** indicate very good protection, but this is a higher threshold than the minimal protective level.
- It suggests a robust immune response, but not the absolute lowest concentration required for immunity.
Extracorporeal Removal Techniques Indian Medical PG Question 2: Following are used in treatment of digitalis toxicity except-
- A. Fab fragments
- B. Lignocaine
- C. Hemodialysis (Correct Answer)
- D. Potassium
Extracorporeal Removal Techniques Explanation: ***Hemodialysis***\n - **Digoxin** has a **large volume of distribution (5-7 L/kg)** and is extensively bound to tissue proteins throughout the body.\n - Only a small fraction of digoxin remains in the plasma, making hemodialysis **ineffective** for removing significant amounts of the drug.\n - Hemodialysis is **not recommended** and **not used** as a treatment for digitalis toxicity.\n\n*Fab fragments*\n - **Digoxin-specific antibody fragments** (Digibind/DigiFab) directly bind to and neutralize free digoxin molecules.\n - This is the **gold standard treatment** for severe digitalis toxicity, especially with life-threatening arrhythmias or significant hyperkalemia.\n - Works rapidly to reverse toxic effects by binding digoxin in the serum.\n\n*Lignocaine*\n - **Lignocaine** (lidocaine) is a class IB antiarrhythmic used to treat **ventricular arrhythmias** caused by digitalis toxicity [1].\n - Suppresses ectopic ventricular activity without further depressing AV conduction.\n - Preferred over other antiarrhythmics like phenytoin for digoxin-induced ventricular tachyarrhythmias.\n\n*Potassium*\n - **Context-dependent use**: Potassium is used in digitalis toxicity **only when hypokalemia is present**.\n - **Hypokalemia** increases myocardial sensitivity to digoxin and worsens toxicity, so correction with potassium is therapeutic.\n - **Important contraindication**: Potassium is **contraindicated in acute digoxin overdose with hyperkalemia**, which commonly occurs due to Na-K-ATPase pump inhibition.\n - When appropriately indicated (hypokalemic state), potassium IS used in management of digitalis toxicity.
Extracorporeal Removal Techniques Indian Medical PG Question 3: According to ATLS classification of hemorrhagic shock, a patient with decreased blood pressure, decreased urine output and decreased circulatory volume of 30-40% is managed by?
- A. blood transfusion alone
- B. crystalloids infusion
- C. crystalloids+blood transfusion (Correct Answer)
- D. plasma therapy
Extracorporeal Removal Techniques Explanation: ***Correct: crystalloids+blood transfusion***
- A 30-40% blood volume loss, indicated by **decreased blood pressure** and **decreased urine output**, corresponds to ATLS **Class III hemorrhagic shock**.
- Management for Class III shock requires both **intravenous crystalloids** to restore circulatory volume and **blood transfusion** to replace lost red blood cells and improve oxygen-carrying capacity.
- The initial approach follows the **3:1 crystalloid replacement rule**, followed by or concurrent with **packed red blood cells** to address ongoing hemorrhage and maintain oxygen delivery.
*Incorrect: blood transfusion alone*
- While blood transfusion is crucial for Class III hemorrhagic shock, administering it **alone** without initial crystalloid resuscitation may not adequately address the immediate need for **intravascular volume expansion**.
- **Crystalloids** are typically administered first or concurrently to rapidly restore circulating volume and support perfusion before packed red blood cells can be prepared and transfused.
*Incorrect: crystalloids infusion*
- **Crystalloids alone** would be insufficient for Class III hemorrhage as the patient has experienced significant **red blood cell loss** (30-40% circulating volume) which requires direct replacement to improve oxygen delivery.
- While initial crystalloid resuscitation is vital, continuing with crystalloids alone will lead to **dilutional coagulopathy** and failure to correct oxygen-carrying capacity.
*Incorrect: plasma therapy*
- **Plasma therapy** (e.g., fresh frozen plasma) is primarily used for the correction of **coagulopathy** in actively bleeding patients or those with anticipated massive transfusion.
- Although it may be part of a massive transfusion protocol for severe hemorrhage, it is not the primary or sole initial treatment strategy for volume resuscitation and red blood cell replacement in Class III shock.
Extracorporeal Removal Techniques Indian Medical PG Question 4: What is the cause of intracorpuscular defects in hemolysis?
- A. PNH (Correct Answer)
- B. Portal hypertension
- C. Paroxysmal cold hemoglobinuria (PCH)
- D. Uremic syndrome
Extracorporeal Removal Techniques Explanation: ***PNH***
- Paroxysmal nocturnal hemoglobinuria (PNH) is caused by a defect in the **GPI anchor**, leading to increased susceptibility of red blood cells to lysis by complement [1].
- The condition is characterized by **intracorpuscular defects**, resulting in hemolysis due to the inability to protect red blood cells from complement-mediated destruction [1].
*Portal hypertension*
- This condition primarily affects the **portal venous system** and is not directly related to **intracorpuscular defects** in red blood cells.
- It commonly leads to complications like **variceal bleeding** and ascites, rather than hemolysis.
*PCH*
- Paroxysmal cold hemoglobinuria (PCH) involves **cold agglutinins** and triggers hemolysis upon exposure to cold, unrelated to **intracorpuscular defects**.
- PCH has a different mechanism involving **IgG antibodies**, resulting in hemolysis when exposed to low temperatures.
*Uremic syndrome*
- Uremic syndrome is a complication of **chronic kidney disease**, leading to hemolysis but due to **extracorpuscular factors** like toxic metabolites rather than intrinsic defects in red blood cells.
- It does not specifically cause **intracorpuscular defects** in hemolysis as seen in PNH.
**References:**
[1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 650-651.
Extracorporeal Removal Techniques Indian Medical PG Question 5: Drug X has an affinity for albumin, while drug Y has 150 times greater affinity. Which of the following statements is MOST accurate?
- A. Drug X will be more available in tissues
- B. Drug Y will be less available in tissues
- C. Toxicity of drug Y may be influenced by multiple factors, not just its binding.
- D. The free concentration of drug X in blood is higher, facilitating tissue distribution. (Correct Answer)
Extracorporeal Removal Techniques Explanation: ***Correct: The free concentration of drug X in blood is higher, facilitating tissue distribution.***
- This is the **MOST accurate and complete** answer because it directly addresses the pharmacokinetic mechanism
- Drug X has **lower affinity for albumin** → larger proportion remains **unbound (free)** in plasma
- Only **free (unbound) drug** can cross capillary membranes to distribute into tissues
- This statement precisely explains both the **cause** (higher free concentration) and **effect** (facilitating tissue distribution)
*Drug X will be more available in tissues*
- This statement is **factually true** and follows logically from drug X's lower protein binding
- However, it's **less precise** than the correct answer because it doesn't explicitly explain the **mechanism** (higher free concentration)
- The term "available" is less specific than "free concentration," which is the key pharmacokinetic parameter
*Drug Y will be less available in tissues*
- This statement is also **factually true** - drug Y's **150× higher albumin affinity** means more drug is bound
- Higher protein binding → **smaller free fraction** → less tissue distribution
- However, like option 1, this doesn't explicitly state the **mechanistic principle** involving free drug concentration
- The question asks for the MOST accurate statement, and this focuses on drug Y rather than explaining the core concept
*Toxicity of drug Y may be influenced by multiple factors, not just its binding*
- While this is a **true general principle**, it's **not directly relevant** to the specific question
- This statement doesn't address the **pharmacokinetic implications** of differential albumin binding
- It's too vague and doesn't demonstrate understanding of the relationship between protein binding and tissue distribution
- The question specifically asks about the affinity differences and their consequences
Extracorporeal Removal Techniques Indian Medical PG Question 6: For toxicological analysis, which preservative is most appropriate for viscera?
- A. 10% sodium chloride (Correct Answer)
- B. 20% alcohol
- C. 10% formalin
- D. Common bile salt
Extracorporeal Removal Techniques Explanation: ***10% sodium chloride***
- **Sodium chloride solution** (common salt) is the **standard preservative** for viscera in toxicological analysis in forensic medicine.
- A **saturated solution of sodium chloride** (approximately 26-36%) is ideal, but even 10% solution provides **antimicrobial properties** that prevent putrefaction.
- It does **not interfere with chemical tests** for poisons, drugs, or toxins, making it superior for toxicological analysis.
- Preserves tissue integrity while allowing accurate detection of volatile and non-volatile poisons.
*20% alcohol*
- While **rectified spirit (90-95% alcohol)** is used for preserving **blood and urine** samples, dilute alcohol (20%) is **not recommended for viscera**.
- Dilute alcohol lacks sufficient antimicrobial strength and may cause tissue shrinkage.
- Not the standard choice in forensic toxicology protocols for visceral organs.
*10% formalin*
- **Formalin** is excellent for **histopathological preservation** but is **contraindicated in toxicological analysis**.
- It can **destroy or alter poisons** and interfere with chemical detection methods.
- Cross-linking of proteins makes toxin extraction difficult.
*Common bile salt*
- **Bile salts** are biological detergents with no preservative properties.
- Not used in forensic medicine for sample preservation.
- No antimicrobial or tissue-stabilizing properties.
Extracorporeal Removal Techniques Indian Medical PG Question 7: After IV drug administration, elimination of a drug depends on:
- A. Lipid solubility
- B. Volume of distribution
- C. Clearance (Correct Answer)
- D. All of the options
Extracorporeal Removal Techniques Explanation: ***Clearance***
- **Clearance (CL)** is the primary and direct determinant of drug elimination after IV administration.
- It represents the **volume of plasma cleared of drug per unit time** (e.g., mL/min or L/hr).
- The **rate of elimination** is directly calculated as: Rate = CL × Plasma concentration
- Clearance integrates the efficiency of all eliminating organs (liver, kidneys) and is the key parameter determining how fast a drug is removed from the body.
- Formula: **CL = Rate of elimination / Plasma concentration**
*Lipid solubility*
- Lipid solubility affects drug **distribution** and **renal reabsorption** but does not directly determine the rate of elimination.
- Highly lipid-soluble drugs may be reabsorbed in renal tubules, but the elimination rate is still governed by clearance.
- Lipid solubility is more relevant to drug distribution and metabolism pathways than to the rate of elimination itself.
*Volume of distribution*
- Volume of distribution (Vd) describes how extensively a drug distributes into tissues versus plasma.
- While Vd affects the **half-life** (t½ = 0.693 × Vd/CL), it does NOT directly determine the elimination rate.
- A large Vd means more drug in tissues, which affects how long elimination takes, but the actual rate of elimination is still determined by clearance.
- Vd is a distribution parameter, not an elimination parameter.
*All of the options*
- This is incorrect because only **clearance** directly determines the rate of drug elimination.
- While lipid solubility and volume of distribution can indirectly influence how long a drug remains in the body, they do not determine the elimination rate itself—clearance does.
Extracorporeal Removal Techniques Indian Medical PG Question 8: Which of the following is not typically performed during septoplasty?
- A. Surgical removal of nasal polyps (Correct Answer)
- B. Throat pack
- C. Nasal packing at the end of surgery
- D. Submucosal resection of deviated cartilage
Extracorporeal Removal Techniques Explanation: ***Surgical removal of nasal polyps***
- Septoplasty is a surgical procedure specifically designed to correct a **deviated nasal septum** by repositioning or removing obstructing cartilage and bone.
- **Nasal polyps** arise from the mucosa of the nasal cavity or sinuses and require a separate procedure, typically **functional endoscopic sinus surgery (FESS)** or polypectomy.
- While septoplasty and polypectomy may sometimes be performed together, polyp removal is **not part of standard septoplasty**.
*Submucosal resection of deviated cartilage*
- This is the **core component of septoplasty** - removing or repositioning deviated septal cartilage while preserving the mucosal lining.
- The submucosal approach maintains structural support while correcting the deviation.
*Throat pack*
- A **throat pack** is routinely placed during septoplasty to **prevent aspiration of blood and secretions** into the pharynx and esophagus.
- It protects the airway and is removed at the end of the procedure.
*Nasal packing at the end of surgery*
- **Nasal packing** (splints or packs) is commonly placed after septoplasty to **control bleeding, support the septum, and prevent hematoma formation**.
- Modern techniques may use absorbable or non-absorbable packing materials.
Extracorporeal Removal Techniques Indian Medical PG Question 9: Which electrolyte imbalance causes prolonged QT interval?
- A. Hypernatremia
- B. Hyperkalemia
- C. Hypocalcemia (Correct Answer)
- D. Hyponatremia
Extracorporeal Removal Techniques Explanation: ***Hypocalcemia***
- **Hypocalcemia** prolongs the **repolarization phase** of the action potential in cardiac myocytes, leading to a lengthened **QT interval** on an electrocardiogram.
- This increased duration of repolarization places the heart at higher risk for **Torsades de Pointes** and other life-threatening arrhythmias [2], [3].
*Hypernatremia*
- **Hypernatremia** primarily affects neurological function and can cause symptoms like **confusion** and **seizures**.
- It does not typically lead to a **prolonged QT interval**; instead, it can sometimes be associated with a shortened QT interval or other non-specific ECG changes.
*Hyperkalemia*
- **Hyperkalemia** primarily causes peaked T waves, a widened QRS complex, and eventually **bradycardia** and **asystole** [1].
- While it drastically alters cardiac conduction, it typically **shortens** rather than prolongs the QT interval.
*Hyponatremia*
- **Hyponatremia** is associated with cerebral edema and neurological symptoms such as **headaches**, **nausea**, and **altered mental status**.
- It generally does not cause a **prolonged QT interval**; significant hyponatremia can sometimes be associated with non-specific ECG changes [1] but not a specific lengthening of the QT interval.
Extracorporeal Removal Techniques Indian Medical PG Question 10: A common finding in osteomalacia is
- A. Low serum phosphate
- B. Normal hydroxy proline levels in urine
- C. Normal level of 1, 25 di-hydroxy vit D3
- D. Low serum calcium (Correct Answer)
Extracorporeal Removal Techniques Explanation: ***Low serum calcium***
- **Osteomalacia** is characterized by defective **bone mineralization**, often due to vitamin D deficiency, which leads to impaired calcium absorption and subsequent **hypocalcemia** [1].
- To compensate for low serum calcium, **parathyroid hormone (PTH)** levels increase, further contributing to altered bone metabolism [1].
*Low serum phosphate*
- While osteomalacia often features **hypophosphatemia**, it is not always the primary or most consistent finding, as **calcium** dysregulation is central to the disease [1].
- **Secondary hyperparathyroidism** in some cases of osteomalacia can lead to increased phosphate excretion, causing low phosphate, but **hypocalcemia** is more directly related to the mineralization defect [1].
*Normal level of 1, 25 di-hydroxy vit D3*
- **1,25-dihydroxyvitami n D3** (calcitriol) levels are typically **low** in nutritional osteomalacia, as this is the active form crucial for calcium absorption and bone mineralization [1].
- Normal levels would contradict the underlying pathology of vitamin D deficiency that causes the condition.
*Normal hydroxy proline levels in urine*
- **Hydroxyproline** is an amino acid found in collagen, and its urinary excretion reflects **bone turnover**; in osteomalacia, due to defective mineralization and sometimes increased bone resorption, hydroxyproline levels can be elevated or altered.
- Normal levels would not be expected given the significant bone metabolic disturbances in osteomalacia.
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