Vascular Surgery Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Vascular Surgery. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Vascular Surgery Indian Medical PG Question 1: Bullet wounds near major blood vessels should be explored only if -
- A. The wound is in close proximity to a major blood vessel
- B. There is any suspicion of possible vascular involvement
- C. Routine exploration is indicated for all penetrating wounds near vessels
- D. There are hard signs of vascular injury (active hemorrhage, expanding hematoma, absent distal pulses, palpable thrill/bruit) (Correct Answer)
Vascular Surgery Explanation: ***There are hard signs of vascular injury (active hemorrhage, expanding hematoma, absent distal pulses, palpable thrill/bruit)***
- **Hard signs** indicate a high likelihood of significant vascular trauma requiring immediate surgical exploration to prevent severe complications such as limb ischemia or exsanguination.
- These signs include **active pulsatile hemorrhage**, rapidly **expanding hematoma**, **absent or diminished distal pulses**, presence of a **thrill or bruit**, and **signs of distal ischemia**.
*The wound is in close proximity to a major blood vessel*
- Proximity alone is a **soft sign** of vascular injury and warrants further investigation, but not immediate routine surgical exploration.
- Many wounds near major vessels do not result in vascular injury; direct exploration without other indications would lead to unnecessary surgeries.
*There is any suspicion of possible vascular involvement*
- **Suspicion** would prompt diagnostic imaging (e.g., CT angiography) or observation, but not an immediate surgical exploration unless hard signs are present.
- Suspicions can be based on soft signs such as a stable hematoma, history of significant bleeding at the scene, or bony injury near a vessel.
*Routine exploration is indicated for all penetrating wounds near vessels*
- **Routine exploration** of all penetrating wounds near vessels is not recommended as it carries risks of iatrogenic injury and surgical complications, and many such wounds do not involve vascular damage.
- Clinical guidelines emphasize selective management based on signs and symptoms, differentiating between hard and soft signs of injury to guide intervention.
Vascular Surgery Indian Medical PG Question 2: Which of the following is the best in-vivo screening choice for carotid artery stenosis?
- A. Digital Subtraction Angiography (DSA)
- B. CT
- C. MRI
- D. USG (Correct Answer)
Vascular Surgery Explanation: ***USG***
- **Ultrasound** (USG), specifically **carotid duplex ultrasonography**, is the **safest**, most cost-effective, and readily available initial screening tool for carotid artery stenosis due to its non-invasive nature and ability to visualize blood flow and vessel morphology.
- It combines **B-mode imaging** with **Doppler flow analysis** to provide real-time images and flow velocity measurements, allowing for assessment of the degree of **stenosis** and plaque characteristics without radiation or contrast agents.
- Sensitivity and specificity exceed 85-90% for detecting significant stenosis, making it the preferred first-line screening modality.
*Digital Subtraction Angiography (DSA)*
- **DSA** is the **gold standard** for anatomical detail and remains the most accurate method for quantifying carotid stenosis, but it is **invasive** and requires arterial catheterization.
- It involves **ionizing radiation** and **iodinated contrast agents**, carrying risks of stroke (0.5-1%), arterial dissection, nephrotoxicity, and contrast allergic reactions.
- Due to its invasive nature and associated risks, DSA is reserved for **pre-surgical planning** or when non-invasive imaging is inconclusive, not for initial screening.
*CT*
- **Computed tomography angiography (CTA)** involves **ionizing radiation** and typically requires an **iodinated contrast agent**, which carries risks of allergy and nephrotoxicity.
- Though CTA provides excellent anatomical detail and can visualize vessel wall calcification, it is generally reserved for confirmation or surgical planning rather than initial screening due to its higher cost, radiation exposure, and contrast-related risks.
*MRI*
- **Magnetic resonance angiography (MRA)** can visualize carotid arteries well but is more expensive, less accessible than ultrasound, and may require a **gadolinium-based contrast agent**, which can have adverse effects (nephrogenic systemic fibrosis in renal impairment).
- It is often used when ultrasound findings are equivocal or in cases where CTA is contraindicated, but it's not the preferred initial screening method due to its complexity, cost, longer examination time, and contraindications (pacemakers, metallic implants).
Vascular Surgery Indian Medical PG Question 3: Assertion: ACE inhibitors are contraindicated in bilateral renal artery stenosis. Reason: They cause acute kidney injury by reducing efferent arteriolar tone.
- A. A true R false
- B. Both A & R true, R explains A (Correct Answer)
- C. Both A & R true, R doesn't explain A
- D. A false R true
Vascular Surgery Explanation: ***Correct: Both A & R true, R explains A***
- **Assertion is TRUE**: ACE inhibitors are absolutely contraindicated in bilateral renal artery stenosis due to risk of acute kidney injury
- **Reason is TRUE**: In bilateral renal artery stenosis, the kidneys depend on **angiotensin II** to maintain GFR by constricting the efferent arteriole
- **R explains A**: ACE inhibitors block angiotensin II production → **efferent arteriolar dilation** → drastically reduced GFR → **acute kidney injury (AKI)**
- This direct mechanistic link makes the reason a complete explanation of the assertion
*Incorrect: A true R false*
- While the assertion is true, the reason is also **true** (not false)
- ACE inhibitors do reduce efferent arteriolar tone by blocking angiotensin II
- This is the precise mechanism causing AKI in these patients
*Incorrect: Both A & R true, R doesn't explain A*
- Both statements are indeed true, but this option is incorrect because the reason **does explain** the assertion
- The mechanism (reduced efferent arteriolar tone → decreased GFR) directly explains why ACE inhibitors are contraindicated
- The causal relationship is clear and direct
*Incorrect: A false R true*
- The assertion is **true**, not false
- ACE inhibitors are definitively contraindicated in bilateral renal artery stenosis
- This is a well-established clinical contraindication to prevent renal failure
Vascular Surgery Indian Medical PG Question 4: Which imaging and Doppler techniques are combined in duplex ultrasonography?
- A. B-mode imaging and pulse-wave Doppler examination (Correct Answer)
- B. M-mode imaging and power Doppler examination
- C. M-mode imaging and waveform analysis
- D. A-mode imaging and pulse-wave Doppler examination
Vascular Surgery Explanation: ***B-mode imaging and pulse-wave Doppler examination***
- **B-mode imaging** provides a real-time, two-dimensional grayscale image of the vessel structure.
- **Pulse-wave Doppler** assesses blood flow direction, velocity, and characteristics within the visualized vessel.
*M-mode imaging and power Doppler examination*
- **M-mode imaging** is primarily used for visualizing moving structures over time (e.g., cardiac valves), not for detailed vessel anatomy.
- **Power Doppler** is sensitive to the presence of blood flow but does not provide information on flow direction or velocity, which is crucial for full duplex ultrasound.
*M-mode imaging and waveform analysis*
- **M-mode imaging** is not the primary imaging modality for evaluating vascular structures in duplex ultrasonography.
- While waveform analysis is part of Doppler interpretation, combining it with M-mode imaging does not constitute duplex ultrasonography.
*A-mode imaging and pulse-wave Doppler examination*
- **A-mode imaging** represents echoes as spikes on a single line, providing limited anatomical information and is not used for vascular assessment.
- Although pulse-wave Doppler is a component, the primary imaging mode is incorrect for duplex ultrasonography.
Vascular Surgery Indian Medical PG Question 5: Which of the following is the best management for radiation induced occlusive disease of carotid artery?
- A. Carotid endarterectomy
- B. Low dose aspirin
- C. Carotid bypass procedure
- D. Carotid angioplasty and stenting (Correct Answer)
Vascular Surgery Explanation: ***Carotid angioplasty and stenting***
- **Radiation-induced carotid artery disease** often involves the distal part of the carotid artery, making it less amenable to surgical endarterectomy.
- **Angioplasty and stenting** offer a less invasive approach with good technical success in these challenging cases, especially given the increased fragility and fibrosis of radiated tissues.
*Carotid endarterectomy*
- **Carotid endarterectomy** in previously radiated fields is associated with a significantly higher risk of complications, including **cranial nerve injury**, **wound infection**, and **carotid artery rupture**, due to tissue fibrosis and scarring.
- The disease often extends beyond the easily accessible segment for endarterectomy in radiation-induced cases.
*Low dose aspirin*
- **Low-dose aspirin** is an important component of medical therapy for **atherosclerotic disease** and **stroke prevention**, but it is insufficient as a sole treatment for symptomatic or high-grade occlusive disease of the carotid artery.
- It helps manage the underlying **atherosclerotic process** but does not directly address the severe stenosis or occlusion.
*Carotid bypass procedure*
- **Carotid bypass procedures** are complex surgical interventions usually reserved for cases of **carotid artery occlusion** or **recurrent stenosis** after previous interventions where endarterectomy or stenting is not feasible.
- While an option, it is more invasive and technically demanding than angioplasty and stenting, particularly in already radiated tissues with compromised vascular integrity.
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