Vascular Surgery Practice Questions

Q: Which of the following is true regarding arteriovenous fistula?

All of the above. An **Arteriovenous (AV) Fistula** is an abnormal communication between an artery and a vein, bypassing the capillary bed. This leads to significant hemodynamic and structural changes. **Explanation of Options:** * **A. Cardiac Failure:** AV fistulas decrease total peripheral resistance (TPR), leading to a compensatory increase in stroke volume and heart rate. This results in **high-output cardiac failure**. A classic sign is **Nicoladoni-Branham’s sign**, where manual compression of the fistula causes bradycardia and a rise in blood pressure. * **B. Local Gigantism:** If a congenital AV fistula occurs before the closure of the epiphyseal plates, the increased blood flow and venous congestion stimulate bone overgrowth, leading to limb lengthening or local gigantism (e.g., **Klippel-Trenaunay Syndrome**). * **C. Ulcers:** While it seems counterintuitive, AV fistulas cause **venous hypertension** and "steal" oxygenated blood away from the distal capillary beds. This leads to chronic venous insufficiency and distal ischemia, both of which manifest as skin pigmentation and non-healing ulcers. **High-Yield Clinical Pearls for NEET-PG:** * **Machinery Murmur:** A continuous thrill and bruit are heard over the site of the fistula. * **Proximal vs. Distal:** The artery proximal to the fistula becomes dilated and tortuous, while the distal part may show signs of ischemia. * **Diagnostic Gold Standard:** Digital Subtraction Angiography (DSA). * **Management:** Small asymptomatic fistulas are observed; symptomatic ones require surgical excision or endovascular embolization.

Q: Thoracic outlet syndrome is most commonly seen in which age group?

Middle-aged women. **Explanation:** Thoracic Outlet Syndrome (TOS) refers to the compression of the neurovascular bundle (brachial plexus, subclavian artery, or subclavian vein) as it passes through the superior thoracic aperture. **Why Middle-aged Women?** TOS is most commonly seen in **women (F:M ratio of approximately 3:1)**, typically between the ages of **20 and 50 years**. The higher prevalence in women is attributed to several factors: * **Anatomical Factors:** Women generally have narrower thoracic outlets and lower-set shoulders (drooping shoulders), which increases the likelihood of nerve or vessel entrapment. * **Muscular Development:** Less developed neck and shoulder girdle musculature compared to men can lead to poor posture, further narrowing the costoclavicular space. * **Hormonal/Structural:** The presence of a cervical rib (a common predisposing factor) is more frequently symptomatic in females. **Analysis of Incorrect Options:** * **Children:** TOS is extremely rare in children as the musculoskeletal structures are still developing and the thoracic outlet is relatively spacious. * **Elderly:** While degenerative changes can occur, the peak incidence is in the productive middle years. In the elderly, symptoms are more likely due to cervical spondylosis. * **Athletes:** While "Paget-Schroetter Syndrome" (effort thrombosis) is a form of venous TOS seen in young athletes, it represents a specific subset and is not the most common demographic for TOS overall. **Clinical Pearls for NEET-PG:** * **Most common type:** Neurogenic TOS (95%), involving the brachial plexus (usually lower trunk, C8-T1). * **Most common cause:** Presence of a **Cervical Rib** (though most cervical ribs are asymptomatic). * **Clinical Tests:** Adson’s test, Roos test (Elevated Arm Stress Test), and Wright’s test. * **First-line Treatment:** Physical therapy and postural correction (except for acute vascular TOS, which may require surgery).

Q: A 67-year-old man presents with sudden left leg pain, absence of pulses, and a cold limb. His past medical history is significant for coronary artery disease and a small aortic aneurysm. Which of the following is most likely responsible for the development of a cold limb in this patient?

Arterial thromboembolism. ### Explanation **Correct Answer: B. Arterial thromboembolism** The patient presents with the classic **"6 Ps" of Acute Limb Ischemia (ALI)**: Pain, Pallor, Pulselessness, Paresthesia, Paralysis, and Perishingly cold (Poikilothermia). In a patient with a history of coronary artery disease and an aortic aneurysm, the most likely cause is an **arterial thromboembolism**. Emboli typically originate from the heart (often due to atrial fibrillation or post-MI mural thrombi) or from proximal aneurysms (where stagnant flow leads to thrombus formation). These emboli lodge at arterial bifurcations (most commonly the femoral artery bifurcation), leading to sudden vascular occlusion and a cold, pulseless limb. **Why incorrect options are wrong:** * **A. Acute myocardial infarction:** While an MI can lead to a mural thrombus that eventually embolizes, the MI itself causes chest pain and hemodynamic instability, not isolated limb ischemia. * **C. Cardiogenic shock:** This would present with systemic hypotension, global hypoperfusion, and bilateral cool extremities, rather than an isolated, pulseless single limb. * **D. Deep venous thrombosis (DVT):** DVT typically presents with a **warm**, swollen, and tender limb (e.g., Phlegmasia cerulea dolens in extreme cases). It does not cause an immediate loss of arterial pulses or a cold limb unless secondary arterial compromise occurs. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of arterial embolism:** Femoral artery bifurcation (followed by the iliacs and popliteal artery). * **Gold Standard Investigation:** Digital Subtraction Angiography (DSA). * **Immediate Management:** IV Unfractionated Heparin to prevent clot propagation. * **Surgical Management:** Emergency embolectomy using a **Fogarty catheter**. * **Time Window:** Irreversible tissue damage (muscle necrosis) typically begins after **6 hours** of complete ischemia.

Q: Which instrument is shown in the image?

Fogarty's catheter. ***Fogarty's catheter*** - Features a distinctive **inflatable balloon tip** that can be inflated to remove emboli or block bronchi during procedures. - Commonly used in **arterial embolectomy** procedures and as a **bronchial blocker** in anesthesia for lung isolation. *Judkins catheter* - A **preformed coronary catheter** with specific curves designed for **cardiac catheterization** procedures. - Does not have an **inflatable balloon tip** and is specifically shaped for accessing coronary arteries. *Pigtailed catheter* - Characterized by a **coiled or curled tip** that prevents perforation of vessel walls during insertion. - Primarily used for **drainage procedures** and **angiography**, lacking the balloon feature of Fogarty catheters. *Simmons catheter* - A **sidewinder catheter** with a specific curved configuration used for **selective catheterization**. - Designed for accessing **visceral arteries** and does not possess an inflatable balloon mechanism.

Q: A 65-year-old female presents for a routine examination and is found to have a pulsatile abdominal mass. She has a history of hypertension but is otherwise healthy. Her father died from a ruptured abdominal aortic aneurysm. What are the acceptable reasons to operate on a 5-cm infrarenal abdominal aortic aneurysm in this patient?

Asymptomatic aneurysm measuring 5.5 cm. **Explanation:** The management of an Abdominal Aortic Aneurysm (AAA) is primarily dictated by the risk of rupture versus the risk of surgical intervention. The threshold for elective repair is based on the diameter where the annual risk of rupture exceeds the risk of perioperative mortality. **Why Option C is correct:** In asymptomatic patients, the standard threshold for elective surgical repair (Open or EVAR) is a diameter of **≥5.5 cm in men** and **≥5.0 cm to 5.5 cm in women**. Since this patient has a 5-cm aneurysm, it does not yet meet the absolute size criteria for surgery; however, reaching the 5.5 cm mark (as stated in the option) is a definitive indication for intervention. **Why the other options are incorrect:** * **Option A:** The mere presence of an aneurysm is not an indication for surgery. Small aneurysms (<5.0 cm) are managed with surveillance (ultrasound) and risk factor modification (smoking cessation, statins, and BP control). * **Option B:** Intramural thrombus is a common finding in AAA and does not independently necessitate surgery unless it causes distal embolization ("Blue Toe Syndrome"). * **Option C:** An isolated iliac artery aneurysm generally requires repair only when it reaches **≥3.5 cm**. A 2-cm iliac aneurysm is managed conservatively. **High-Yield Clinical Pearls for NEET-PG:** 1. **Indications for AAA Repair:** * Diameter ≥5.5 cm (Men) or ≥5.0 cm (Women). * Rapid expansion: >0.5 cm in 6 months or >1 cm in 1 year. * Symptomatic aneurysm (tenderness, back pain, or distal emboli). 2. **Risk Factors:** Smoking is the strongest risk factor for development/expansion; Family history is a significant predictor. 3. **Screening:** A one-time USG is recommended for men aged 65–75 who have ever smoked. 4. **Most common site:** Infrarenal (between renal arteries and aortic bifurcation).

Q: Which statement is NOT true regarding carotid body tumors?

None of the above. **Explanation:** The correct answer is **D (None of the above)** because all the statements provided (A, B, and C) are clinically accurate descriptions of carotid body tumors (CBTs). 1. **Statement A (Unilateral):** While CBTs can be bilateral (especially in familial cases associated with SDH mutations), the **vast majority (approx. 90%) are sporadic and unilateral**. Therefore, describing them as unilateral is a true general characteristic. 2. **Statement B (Surgical resection is the treatment):** Surgical excision is the definitive treatment of choice. For larger tumors, preoperative embolization may be used to reduce vascularity. 3. **Statement C (Non-chromaffin paraganglioma):** CBTs arise from the extra-adrenal neural crest cells. Unlike the adrenal medulla, these cells do not stain with chromium salts (non-chromaffin) and usually do not secrete catecholamines. Since all statements are true, "None of the above" is the only logical choice for a "NOT true" question. **Clinical Pearls for NEET-PG:** * **Fontaine’s Sign:** The tumor is mobile horizontally but fixed vertically (due to its location within the carotid sheath). * **Lyre Sign:** On angiography, the tumor causes widening/splaying of the carotid bifurcation (displacement of internal and external carotid arteries). * **Origin:** It arises from the **chemoreceptors** located at the carotid bulb (sensitive to hypoxia and hypercapnia). * **Shamblin Classification:** Used to grade the tumor based on its involvement/encasement of the carotid vessels, which predicts surgical difficulty. * **Malignancy:** Only about 10% are malignant; malignancy is defined by lymph node or distant metastasis, not histology.

Q: Which of the following is a cause of peripheral arterial occlusive disease?

All of the above. **Explanation:** Peripheral Arterial Occlusive Disease (PAOD) refers to the narrowing or occlusion of arteries supplying the limbs, leading to reduced blood flow. While atherosclerosis is the most common cause, various inflammatory and autoimmune conditions can lead to arterial occlusion. * **Buerger’s Disease (Thromboangiitis Obliterans):** This is a non-atherosclerotic, segmental inflammatory disease strongly associated with tobacco use. It primarily affects small and medium-sized arteries and veins of the distal extremities, leading to ischemia, gangrene, and eventual occlusion. * **Systemic Lupus Erythematosus (SLE):** SLE can cause PAOD through multiple mechanisms, including premature atherosclerosis, vasculitis (inflammation of the vessel wall), and a prothrombotic state (often associated with Anti-Phospholipid Antibody Syndrome), all of which can result in arterial blockage. * **Takayasu Arteritis:** Known as "pulseless disease," this is a large-vessel vasculitis that primarily affects the aorta and its main branches. The resulting granulomatous inflammation leads to stenosis, occlusion, or aneurysms, frequently presenting as absent peripheral pulses. **Conclusion:** Since all three conditions involve mechanisms that lead to the narrowing or blockage of peripheral arteries, **Option D** is the correct answer. **High-Yield Clinical Pearls for NEET-PG:** * **Buerger’s Disease:** Characterized by the "corkscrew collaterals" on angiography and the classic triad of claudication, Raynaud’s phenomenon, and migratory superficial thrombophlebitis. * **Takayasu Arteritis:** Most common in young females; involves the subclavian artery most frequently, leading to blood pressure discrepancy between arms. * **Leriche Syndrome:** A specific form of PAOD involving aortoiliac occlusion, presenting with the triad of claudication (buttock/thigh), impotence, and absent femoral pulses.

Q: Which of the following is NOT used in the treatment of superficial venous thrombosis?

Rest and elevation. **Explanation:** Superficial Venous Thrombosis (SVT) is often considered a benign condition, but modern management focuses on preventing its progression to Deep Vein Thrombosis (DVT) or Pulmonary Embolism (PE). **Why "Rest and Elevation" is the correct answer (as the NOT used treatment):** Historically, SVT was treated with rest and elevation. However, current surgical guidelines (including ESVS and CHEST) emphasize **early mobilization** rather than rest. Prolonged immobilization (rest) is a major risk factor for Virchow’s triad, increasing the likelihood of thrombus propagation into the deep venous system via the saphenofemoral or saphenopopliteal junctions. Therefore, bed rest is now contraindicated. **Analysis of Incorrect Options:** * **Immediate Anticoagulation:** This is now a standard of care for SVT, especially if the thrombus is >5 cm in length or within 3 cm of the deep venous junction. Low Molecular Weight Heparin (LMWH) or Fondaparinux (the drug of choice based on the SURPRISE trial) are used to prevent thromboembolic complications. * **Analgesics:** NSAIDs are a cornerstone of symptomatic management to reduce pain and local inflammation associated with the thrombophlebitis. * **Treat associated malignancy:** Migratory superficial thrombophlebitis (**Trousseau sign**) is a classic paraneoplastic manifestation often associated with visceral cancers (e.g., pancreatic cancer). Identifying and treating the underlying malignancy is essential for definitive management. **NEET-PG High-Yield Pearls:** * **Drug of Choice:** Fondaparinux (2.5 mg subcutaneous daily for 45 days) is the preferred anticoagulant for SVT. * **Trousseau Sign:** Recurrent, migratory SVT at unusual sites; strongly suggests occult malignancy. * **Gold Standard Investigation:** Venous Duplex Ultrasound (to rule out concomitant DVT).

Question 1

Which of the following is true regarding arteriovenous fistula?

Accepted Answer

All of the above

Answer

Leads to cardiac failure

Answer

Causes local gigantism

Answer

Can cause ulcers

Question 2

Thoracic outlet syndrome is most commonly seen in which age group?

Accepted Answer

Middle-aged women

Answer

Children

Answer

Elderly

Answer

Athletes

Question 3

A 67-year-old man presents with sudden left leg pain, absence of pulses, and a cold limb. His past medical history is significant for coronary artery disease and a small aortic aneurysm. Which of the following is most likely responsible for the development of a cold limb in this patient?

Accepted Answer

Arterial thromboembolism

Answer

Acute myocardial infarction

Answer

Cardiogenic shock

Answer

Deep venous thrombosis

Question 4

Regarding abdominal aortic aneurysm, all are true except?

Accepted Answer

Splenic artery aneurysm is the most common type of visceral artery aneurysm

Answer

More common in males

Answer

Transverse diameter of the aorta in an aneurysm should be 3cm or more

Answer

Common in smokers

Question 5

Which instrument is shown in the image?

Accepted Answer

Fogarty's catheter

Answer

Judkins catheter

Answer

Pigtailed catheter

Answer

Simmons catheter

Question 6

A 65-year-old female presents for a routine examination and is found to have a pulsatile abdominal mass. She has a history of hypertension but is otherwise healthy. Her father died from a ruptured abdominal aortic aneurysm. What are the acceptable reasons to operate on a 5-cm infrarenal abdominal aortic aneurysm in this patient?

Accepted Answer

Asymptomatic aneurysm measuring 5.5 cm

Answer

Presence of the aneurysm

Answer

Aneurysm with intramural thrombus

Answer

Associated 2-cm iliac aneurysm

Question 7

Which statement is NOT true regarding carotid body tumors?

Accepted Answer

None of the above

Answer

Unilateral

Answer

Surgical resection is the treatment

Answer

Non-chromaffin paraganglioma

Question 8

What is true about mesenteric vein thrombosis?

Accepted Answer

Surgery can lead to short-bowel syndrome.

Answer

Peritoneal signs are always present.

Answer

It invariably involves a long length of bowel.

Answer

Intravenous heparin is the treatment of choice.

Question 9

Which of the following is a cause of peripheral arterial occlusive disease?

Accepted Answer

All of the above

Answer

Buerger’s disease

Answer

SLE

Answer

Takayasu arteritis

Question 10

Which of the following is NOT used in the treatment of superficial venous thrombosis?

Accepted Answer

Rest and elevation

Answer

Immediate anticoagulation

Answer

Analgesics

Answer

Treat associated malignancy

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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