Performance Enhancement — MCQs
Protein metabolism after trauma is characterized by the following except:
All of the following are side effects of growth hormone supplementation therapy except
Due to fear which of the following hormones increases rapidly?
Long-term use of which diuretic agent can result in gynaecomastia?
All of the following are increased in Acute stress except
During a 100 m sprint which of the following is used by the muscle for meeting energy demands?
Painful arc syndrome is characterized by pain during which movement?
Which of the following is NOT a component of O'Donoghue's unhappy triad?
Which is the primary clinical test for an anterior cruciate ligament (ACL) injury?
Which is the investigation of choice for a sports injury of the knee?
Performance Enhancement Indian Medical PG Practice Questions and MCQs
Question 1: Protein metabolism after trauma is characterized by the following except:
- A. Increased liver gluconeogenesis
- B. Increased urinary nitrogen loss
- C. Hepatic synthesis of acute phase reactants
- D. Inhibition of skeletal muscle breakdown by interleukin 1 and tumour necrosis factor (Correct Answer)
Explanation: ***Inhibition of skeletal muscle breakdown by interleukin 1 and tumour necrosis factor*** - After trauma, **interleukin 1 (IL-1)** and **tumor necrosis factor (TNF)** actually **promote** skeletal muscle breakdown (catabolism) to provide amino acids for gluconeogenesis and acute phase protein synthesis. - This statement is incorrect because these cytokines are **pro-catabolic**, not inhibitory, in their effect on muscle protein. *Increased liver gluconeogenesis* - Trauma leads to a significant increase in **liver gluconeogenesis**, primarily to maintain glucose supply for **immune cells** and wound healing, which rely heavily on glucose. - This process utilizes amino acids obtained from muscle breakdown as substrates. *Increased urinary nitrogen loss* - The breakdown of muscle protein releases amino acids, which are then deaminated. The nitrogen waste product, **urea**, is excreted in the urine, leading to **increased urinary nitrogen loss**. - This is a direct consequence of the catabolic state. *Hepatic synthesis of acute phase reactants* - The liver increases the synthesis of **acute phase reactants** (e.g., C-reactive protein, fibrinogen, haptoglobin) in response to inflammatory cytokines like IL-1, **IL-6**, and TNF. - These proteins play a crucial role in the inflammatory response and tissue repair.
Question 2: All of the following are side effects of growth hormone supplementation therapy except
- A. Slipped capital femoral epiphysis
- B. Pseudotumour cerebri
- C. Hypoglycemia (Correct Answer)
- D. Arthralgia
Explanation: ***Hypoglycemia*** - Growth hormone (GH) has an **anti-insulin effect**, increasing **insulin resistance** and hepatic glucose production, leading to **hyperglycemia** rather than hypoglycemia. - This diabetogenic effect contributes to a higher risk of developing **impaired glucose tolerance** and **type 2 diabetes mellitus** in individuals receiving long-term GH therapy. - GH is a **counter-regulatory hormone** that opposes insulin action. *Slipped capital femoral epiphysis* - Growth hormone supplementation can accelerate linear growth, which increases the risk of **mechanical stress** on the growth plate. - This rapid growth can lead to **weakening and displacement of the femoral capital epiphysis**, particularly in prepubertal and pubertal children. - This is a recognized orthopedic complication requiring monitoring during GH therapy. *Arthralgia* - Joint pain and stiffness are **common side effects** of GH therapy, affecting up to 25% of patients. - Related to **fluid retention** and **soft tissue swelling** caused by GH's effects on sodium and water retention. - May be accompanied by **myalgia** (muscle pain) and **carpal tunnel syndrome**. *Pseudotumour cerebri* - Also known as **benign intracranial hypertension**, this rare but serious side effect involves increased intracranial pressure without a tumor. - Presents with **headache, visual disturbances**, and **papilledema**. - Mechanism may involve alterations in **cerebrospinal fluid dynamics** and **increased CSF production** induced by GH.
Question 3: Due to fear which of the following hormones increases rapidly?
- A. Growth hormones
- B. Thyroid hormone
- C. Corticosteroid
- D. Epinephrine (Correct Answer)
Explanation: ***Epinephrine*** - **Epinephrine**, also known as adrenaline, is a hormone and neurotransmitter involved in the **"fight or flight" response** to stress, fear, or excitement. - When faced with fear, the **adrenal medulla** releases epinephrine, leading to rapid physiological changes like increased heart rate, blood pressure, and energy availability to prepare the body for immediate action. *Growth hormones* - **Growth hormone (GH)** primarily regulates growth, metabolism, and body composition. - While stress can influence GH secretion, a rapid increase in direct response to acute fear is not its primary function. *Thyroid hormone* - **Thyroid hormones (T3 and T4)** regulate metabolism, energy balance, and body temperature over a longer term. - Their primary role is not in the immediate, rapid physiological response to acute fear. *Corticosteroid* - **Corticosteroids**, such as cortisol, are released in response to stress, but their increase is typically more prolonged than the instant surge of epinephrine. - They play a role in modulating immune response and metabolism during stress but are not responsible for the immediate "fight or flight" reactions.
Question 4: Long-term use of which diuretic agent can result in gynaecomastia?
- A. Amiloride
- B. Acetazolamide
- C. Spironolactone (Correct Answer)
- D. Triamterene
Explanation: ***Spironolactone*** - **Spironolactone** is an **aldosterone antagonist** with a chemical structure similar to steroid hormones, enabling it to also act as a weak **androgen receptor antagonist** and **progesterone receptor partial agonist**. - This anti-androgenic and progestogenic activity can lead to **gynaecomastia** (breast enlargement in males), **breast tenderness**, and menstrual irregularities as dose-dependent side effects. *Amiloride* - **Amiloride** is a **potassium-sparing diuretic** that directly blocks epithelial sodium channels (ENaC) in the collecting duct. - It does not interfere with hormone receptors and is **not associated with gynaecomastia**. *Acetazolamide* - **Acetazolamide** is a **carbonic anhydrase inhibitor** that primarily acts in the proximal tubule. - Its mechanism of action does not involve modulation of steroid hormones, and it is **not known to cause gynaecomastia**. *Triamterene* - **Triamterene** is another **potassium-sparing diuretic** that, like amiloride, directly blocks ENaC channels. - It lacks significant hormonal effects and is **not associated with gynaecomastia**.
Question 5: All of the following are increased in Acute stress except
- A. Growth hormone
- B. Epinephrine
- C. Glucagon
- D. Insulin (Correct Answer)
Explanation: ***Insulin*** - During acute stress, **insulin secretion is actively suppressed** by catecholamines (epinephrine and norepinephrine) acting on **alpha-2 adrenergic receptors** on pancreatic beta cells. - This suppression is crucial for the stress response, as it allows **unopposed action of counter-regulatory hormones** to mobilize glucose and raise blood glucose levels. - The body prioritizes **immediate energy availability** (high blood glucose) over storage, making insulin the hormone that is **decreased, not increased**, during acute stress. *Growth hormone* - **Growth hormone** is a counter-regulatory hormone that **increases during acute stress** to mobilize energy stores, particularly by promoting lipolysis and gluconeogenesis. - Its actions contribute to the stress-induced elevation of **blood glucose levels**. *Epinephrine* - **Epinephrine** (adrenaline) is a primary catecholamine released during acute stress, leading to a rapid **fight or flight response**. - It significantly **increases heart rate**, blood pressure, and **glucose mobilization** through glycogenolysis and gluconeogenesis. *Glucagon* - **Glucagon** is a key hormone involved in **maintaining glucose homeostasis** and is significantly **increased during acute stress**. - It primarily acts on the liver to **stimulate glycogenolysis** and **gluconeogenesis**, thereby raising blood glucose levels to provide energy.
Question 6: During a 100 m sprint which of the following is used by the muscle for meeting energy demands?
- A. Phosphofructokinase
- B. Phosphocreatine (Correct Answer)
- C. Glucose 1 - phosphate
- D. Creatine phosphokinase
Explanation: ***Phosphocreatine*** - **Phosphocreatine (PCr)** is the primary energy source for a **100m sprint** (lasting 10-20 seconds). - The **ATP-PC (phosphagen) system** provides **immediate energy** by rapidly regenerating **ATP** from ADP through the transfer of a high-energy phosphate group. - This system is crucial for **short bursts of maximal intensity exercise** where energy demand exceeds the capacity of glycolysis and oxidative phosphorylation to respond quickly enough. - Phosphocreatine stores can fuel maximum effort for approximately **10-15 seconds**, making it ideal for sprint activities. *Phosphofructokinase* - **Phosphofructokinase (PFK)** is a key regulatory enzyme in **glycolysis**, not an energy substrate. - While PFK-catalyzed glycolysis contributes ATP during intense exercise, it cannot provide energy as rapidly as the phosphocreatine system. - Glycolysis becomes more prominent after the first 10-15 seconds of maximal effort. *Glucose 1-phosphate* - **Glucose 1-phosphate** is an intermediate in **glycogenolysis** (breakdown of glycogen to glucose-6-phosphate). - It is part of the pathway leading to glucose availability for glycolysis, but is not a **direct, immediate energy source** for muscle contraction. - Unlike phosphocreatine, it cannot directly regenerate ATP. *Creatine phosphokinase* - **Creatine phosphokinase (CPK)**, also known as **creatine kinase (CK)**, is the **enzyme** that catalyzes the reversible transfer of phosphate from phosphocreatine to ADP. - It facilitates the energy transfer reaction but is **not an energy substrate** itself. - The enzyme enables the phosphocreatine system to function, but the actual energy comes from phosphocreatine.
Question 7: Painful arc syndrome is characterized by pain during which movement?
- A. Initial abduction
- B. Terminal abduction
- C. Mid-range abduction (Correct Answer)
- D. Full range of abduction
Explanation: **Explanation:** **Painful Arc Syndrome** is a clinical sign typically associated with **Subacromial Impingement Syndrome**. It occurs when the structures within the subacromial space (most commonly the Supraspinatus tendon or the subacromial bursa) become compressed between the greater tuberosity of the humerus and the acromion process. 1. **Why Mid-range Abduction is Correct:** During abduction, the subacromial space is at its narrowest between **60° and 120°**. In this range, the inflamed or degenerated tendon is pinched against the acromial arch, eliciting sharp pain. This is the "mid-range" of motion. 2. **Analysis of Incorrect Options:** * **Initial Abduction (0°–15°):** Pain here usually indicates a complete Supraspinatus tear (inability to initiate) or severe tendonitis, but the subacromial space is not yet maximally compromised. * **Terminal Abduction (120°–180°):** Pain at the very end of abduction is characteristic of **Acromioclavicular (AC) joint arthritis**, not impingement. * **Full Range:** Pain throughout the entire range is more suggestive of adhesive capsulitis (Frozen Shoulder) or acute calcific tendonitis rather than a classic "arc." **Clinical Pearls for NEET-PG:** * **Neer’s Test and Hawkins-Kennedy Test:** These are the specific clinical provocative tests used to confirm subacromial impingement. * **The "Critical Zone":** The area of the Supraspinatus tendon roughly 1 cm proximal to its insertion is relatively avascular and is the most common site for pathology in this syndrome. * **Management:** Initial treatment is conservative (NSAIDs, PT, subacromial steroid injection). Surgical decompression (Acromioplasty) is reserved for refractory cases.
Question 8: Which of the following is NOT a component of O'Donoghue's unhappy triad?
- A. Anterior cruciate ligament (ACL) injury
- B. Medial meniscus injury
- C. Medial collateral ligament (MCL) injury
- D. Fibular collateral ligament (FCL) injury (Correct Answer)
Explanation: **Explanation:** O’Donoghue’s Unhappy Triad (also known as the "blown knee") is a classic clinical triad involving a severe injury to three specific structures of the knee joint. It typically occurs when a lateral (valgus) force is applied to the knee while the foot is fixed on the ground. **1. Why Option D is Correct:** The **Fibular Collateral Ligament (FCL)**, also known as the Lateral Collateral Ligament (LCL), is **not** part of the triad. The triad specifically involves structures on the medial side of the knee. An LCL injury usually results from a varus force, which is the opposite of the mechanism that causes the Unhappy Triad. **2. Why the Other Options are Incorrect:** The traditional O’Donoghue’s Triad consists of: * **Anterior Cruciate Ligament (ACL) injury (Option A):** The most common ligamentous component of the triad, providing anterior stability. * **Medial Collateral Ligament (MCL) injury (Option C):** Occurs due to the valgus stress that opens the medial joint compartment. * **Medial Meniscus injury (Option B):** Classically described by O'Donoghue. However, modern sports medicine (via MRI studies) has shown that in acute non-contact injuries, **Lateral Meniscus** tears are actually more frequent. Despite this, for exam purposes and the classic definition, the Medial Meniscus remains the standard answer. **Clinical Pearls for NEET-PG:** * **Mechanism of Injury:** Valgus stress with external rotation of the tibia. * **Pivot Shift Test:** Most specific clinical test for ACL deficiency. * **McMurray Test:** Used to identify meniscal tears. * **High-Yield Note:** If a question asks for the "most common" meniscus injured in an acute ACL tear, the answer is often the **Lateral Meniscus**. If it asks for the components of "O'Donoghue's Triad," the answer is the **Medial Meniscus**.
Question 9: Which is the primary clinical test for an anterior cruciate ligament (ACL) injury?
- A. Lachman test (Correct Answer)
- B. Bryant's test
- C. Jobe's test
- D. Hamilton's test
Explanation: **Explanation:** The **Lachman test** is considered the most sensitive and reliable clinical test for diagnosing an acute **Anterior Cruciate Ligament (ACL)** injury. It is performed with the knee in 20–30° of flexion. The examiner stabilizes the femur with one hand and applies an anterior force to the proximal tibia with the other. A positive result is indicated by increased anterior translation of the tibia or a "soft/mushy" end-point. It is superior to the Anterior Drawer test because, at 30° flexion, the secondary stabilizers (like the posterior horn of the medial meniscus) are less likely to provide a false sense of stability. **Analysis of Incorrect Options:** * **Bryant’s test:** Used to assess **Developmental Dysplasia of the Hip (DDH)** or proximal femoral shortening. It involves measuring the vertical distance between the anterior superior iliac spine (ASIS) and the tip of the greater trochanter. * **Jobe’s test (Empty Can test):** A clinical test for the shoulder used to evaluate the **Supraspinatus tendon** for impingement or tears. * **Hamilton’s test (Ruler test):** Used in **Shoulder Dislocation**. In a normal shoulder, a straight edge cannot touch the acromion and the lateral epicondyle simultaneously; in a dislocation, it can. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** MRI is the investigation of choice for ACL tears. * **Pivot Shift Test:** This is the most **specific** clinical test for ACL insufficiency (indicates anterolateral rotatory instability). * **Segond Fracture:** An avulsion fracture of the lateral tibial condyle; it is pathognomonic for an ACL tear. * **Unhappy Triad (O'Donoghue):** Injury involving the ACL, Medial Collateral Ligament (MCL), and Medial Meniscus (though recent studies suggest the Lateral Meniscus is more commonly injured in acute cases).
Question 10: Which is the investigation of choice for a sports injury of the knee?
- A. Ultrasonography
- B. Plain radiography
- C. Arthrography
- D. Arthroscopy (Correct Answer)
Explanation: **Explanation:** The knee is the most common site of sports-related injuries, frequently involving the anterior cruciate ligament (ACL), menisci, and articular cartilage. **Arthroscopy** is considered the "Gold Standard" and investigation of choice because it serves a dual purpose: it allows for direct visualization of intra-articular structures (diagnostic) and enables immediate surgical repair or debridement (therapeutic). While non-invasive imaging is common, arthroscopy provides 100% accuracy in identifying pathology that might be missed on scans. **Analysis of Options:** * **A. Ultrasonography:** Useful for superficial soft tissue injuries (e.g., patellar tendonitis) but cannot visualize deep intra-articular structures like the cruciate ligaments or posterior horns of the menisci effectively. * **B. Plain Radiography:** This is the initial investigation to rule out fractures (e.g., Segond fracture) or bony avulsions, but it cannot visualize soft tissue injuries, which constitute the majority of sports knee trauma. * **C. Arthrography:** An invasive procedure involving dye injection; it has been largely rendered obsolete by the advent of MRI and diagnostic arthroscopy. **Clinical Pearls for NEET-PG:** * **MRI** is the investigation of choice for **screening** and the most accurate **non-invasive** modality for soft tissue injuries of the knee. * **Arthroscopy** is the **Gold Standard** and the definitive investigation of choice. * **Segond Fracture:** A cortical avulsion of the lateral tibial condyle, which is pathognomonic for an ACL tear. * **O’Donoghue’s Triad:** Injury involving the ACL, Medial Collateral Ligament (MCL), and Medial Meniscus (though recent studies suggest the Lateral Meniscus is more commonly injured in acute ACL tears).
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