Vascular Surgery — MCQs

Vascular Surgery Indian Medical PG Practice Questions and MCQs

Question 211: Intermittent claudication is caused by?

A. Venous occlusion
B. Arterial insufficiency (Correct Answer)
C. Neural compression
D. Muscular dystrophy

Explanation: **Explanation:** **Intermittent Claudication** is the hallmark clinical symptom of Peripheral Arterial Disease (PAD). It is defined as a reproducible aching, cramping, or fatigue in a muscle group (most commonly the calf) that occurs during exercise and is relieved by rest. **1. Why Arterial Insufficiency is correct:** The underlying mechanism is a **mismatch between oxygen supply and demand**. Under resting conditions, the narrowed (atherosclerotic) arteries provide enough blood flow to meet metabolic needs. However, during exercise, the demand for oxygenated blood in the muscles increases significantly. Due to the arterial stenosis, the blood flow cannot increase sufficiently, leading to **muscle ischemia** and the accumulation of metabolic byproducts (like lactic acid), which triggers pain. **2. Why the other options are incorrect:** * **Venous occlusion:** Typically presents with "Venous Claudication," characterized by a bursting pain and cyanosis of the limb, usually following DVT. It is relieved by leg elevation rather than simple rest. * **Neural compression:** Causes "Pseudoclaudication" (often due to Spinal Canal Stenosis). Unlike arterial claudication, the pain is often triggered by standing or posture rather than just walking and is relieved by sitting or leaning forward (shopping cart sign). * **Muscular dystrophy:** This is a genetic primary muscle disorder causing progressive weakness, not exercise-induced ischemic pain. **Clinical Pearls for NEET-PG:** * **Most common site:** The **calf muscle** (due to Superficial Femoral Artery occlusion). * **Boyd’s Classification:** Used to grade the severity of intermittent claudication. * **Fontaine Classification:** Stage II represents intermittent claudication (IIa: >200m, IIb: <200m). * **Ankle-Brachial Index (ABI):** A value of **<0.9** is diagnostic of PAD; claudicants typically have an ABI between 0.5 and 0.9. * **Management:** Smoking cessation and supervised exercise therapy are the first-line treatments. Cilostazol is the drug of choice for symptom relief.

Question 212: Which of the following is NOT a bypass procedure used in the surgical management of lymphedema?

A. Homan's operation (Correct Answer)
B. Handley's operation
C. Kinmonth operation
D. Gillies operation

Explanation: **Explanation:** The surgical management of lymphedema is broadly classified into two categories: **Excisional (Reductive) procedures** and **Physiological (Reconstructive/Bypass) procedures**. **Why Option A is correct:** **Homan’s operation** is an **excisional procedure**. It is a modification of the Sistrunk procedure where skin flaps are raised, and the underlying diseased subcutaneous tissue and deep fascia are excised. Since it involves the physical removal of tissue rather than creating a new pathway for lymph flow, it is not a bypass procedure. **Why the other options are incorrect:** The other options represent historical or modern attempts at **Physiological/Bypass procedures**, which aim to improve lymph drainage: * **Handley’s operation (Lymphangioplasty):** An early bypass technique using silk threads or tubes buried in the subcutaneous tissue to act as conduits for lymph. * **Kinmonth operation (Enteromesenteric bridge):** Involves using a pedicled segment of ileal mucosa (with its mesenteric lymphatics) to bridge the gap between obstructed inguinal nodes and healthy iliac nodes. * **Gillies operation (Lymphatic wicking):** A procedure using a buried skin flap (bridge) to carry lymphatics across an obstructed area (e.g., from the arm to the trunk). **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Excisional Procedure:** **Charles Operation** (radical excision of all skin and subcutaneous tissue down to the deep fascia, followed by skin grafting). It is reserved for severe cases (Elephantiasis). * **Modern Gold Standard Physiological Procedure:** **Lymphaticovenular Anastomosis (LVA)**, performed using super-microsurgery. * **Staging:** Lymphedema is staged using the **Brunner classification** or the **International Society of Lymphology (ISL)** staging. * **Stemmer’s Sign:** Inability to pinch the skin on the dorsal surface of the base of the second toe; a pathognomonic clinical sign for lymphedema.

Question 213: Which among the following is not a feature of peripheral arterial occlusion?

A. Shock (Correct Answer)
B. Pallor
C. Pain
D. Pulselessness

Explanation: **Explanation:** Acute peripheral arterial occlusion is a surgical emergency characterized by the sudden cessation of blood flow to a limb. The diagnosis is primarily clinical, based on the classic **"6 Ps"** of acute limb ischemia. **1. Why "Shock" is the correct answer:** Shock is a systemic state of circulatory collapse leading to inadequate tissue perfusion across multiple organ systems. While peripheral arterial occlusion causes localized ischemia to a specific limb, it does not typically cause systemic hypotension or shock unless it is a secondary complication of a massive underlying event (like a large Myocardial Infarction causing a saddle embolus). Therefore, shock is not a diagnostic feature of the arterial occlusion itself. **2. Analysis of Incorrect Options (The 6 Ps):** * **Pain:** Usually the earliest and most common symptom. It is sudden, severe, and located distal to the site of occlusion. * **Pallor:** The affected limb appears "waxy white" due to the lack of erythrocyte-filled capillaries. * **Pulselessness:** A hallmark sign; pulses are absent distal to the level of the occlusion. * *Note: The remaining 3 Ps are Paresthesia (loss of sensory function), Paralysis (loss of motor function—a late sign), and Poikilothermia (limb takes on the ambient temperature).* **Clinical Pearls for NEET-PG:** * **Golden Period:** Revascularization should ideally be performed within **6 hours** to prevent irreversible muscle necrosis and "Rigor Mortis" of the limb. * **Most Common Site of Embolism:** The **Femoral artery bifurcation** is the most frequent site for peripheral embolic lodgment. * **Most Common Source:** The heart (Atrial Fibrillation) is the source of emboli in over 80% of cases. * **Management:** Immediate anticoagulation with **IV Heparin** is the first step to prevent clot propagation, followed by surgical embolectomy (using a **Fogarty catheter**).

Question 214: The following are true regarding intermittent claudication, except:

A. Cramping pain typically in calf muscles
B. Occurs usually after a similar degree of activity
C. Relieved by rest quickly
D. Affected by body position (Correct Answer)

Explanation: **Explanation:** Intermittent claudication is the hallmark symptom of **Peripheral Arterial Disease (PAD)**. It results from a "supply-demand mismatch" where atherosclerotic narrowing of arteries prevents adequate blood flow to muscles during exercise, leading to anaerobic metabolism and the accumulation of lactic acid. **Why Option D is the Correct Answer (The "Except"):** Intermittent claudication is **not affected by body position**. It is strictly induced by exercise and relieved by cessation of activity (rest). In contrast, **Neurogenic Claudication** (caused by spinal stenosis) is highly dependent on posture; it is often relieved by leaning forward (the "shopping cart sign") or sitting, rather than just stopping the activity. Additionally, pain that is relieved by hanging the legs over the side of the bed is characteristic of **Rest Pain** (Critical Limb Ischemia), not intermittent claudication. **Analysis of Incorrect Options:** * **Option A:** The most common site is the **calf muscles** (due to superficial femoral artery involvement), described as a dull ache, cramp, or fatigue. * **Option B:** It is highly **reproducible**. A patient will typically experience pain after walking a specific, consistent distance (the "claudication distance"). * **Option C:** Because the metabolic demand drops immediately upon stopping, the pain is typically **relieved within 2–5 minutes of rest**. **NEET-PG High-Yield Pearls:** * **Boyd’s Classification:** Used to grade the severity of intermittent claudication. * **Ankle-Brachial Index (ABI):** Claudicants usually have an ABI between **0.5 and 0.9**. * **Leriche Syndrome:** Triad of claudication (hip/buttock), impotence, and absent femoral pulses due to aortoiliac occlusion. * **Management:** The first-line treatment for stable claudication is **supervised exercise therapy** and smoking cessation. **Cilostazol** is the most effective pharmacological agent for increasing walking distance.

Question 215: What is the most common site for venous thrombosis?

A. Popliteal vein
B. Soleal vein (Correct Answer)
C. Femoral vein
D. Internal iliac vein

Explanation: **Explanation:** The **soleal veins** (located within the soleus muscle in the calf) are the most common site for the initiation of venous thrombosis. These veins are large, thin-walled, valveless sinusoids that act as a reservoir for blood. During periods of immobility, the "calf muscle pump" fails, leading to significant stasis in these sinuses. According to Virchow’s Triad, stasis is a primary driver of thrombus formation, making the soleal veins the most frequent nidus for Deep Vein Thrombosis (DVT). **Analysis of Options:** * **B. Soleal vein (Correct):** Most DVTs originate here. While many remain asymptomatic and undergo spontaneous lysis, they can propagate proximally to involve the popliteal and femoral veins. * **A. Popliteal vein:** This is a common site for *extension* of a calf thrombus, but it is not the most common site of primary origin. * **C. Femoral vein:** Though clinically significant due to a higher risk of pulmonary embolism (PE) when involved, primary thrombosis here is less common than in the calf sinuses. * **D. Internal iliac vein:** Thrombosis here is rare compared to the lower limb and is usually associated with pelvic surgery, trauma, or malignancy. **NEET-PG High-Yield Pearls:** * **Most common site for DVT:** Soleal veins (Calf sinusoids). * **Most common source of clinically significant Pulmonary Embolism:** Iliofemoral veins (proximal DVT). * **Gold Standard Investigation for DVT:** Contrast Venography (rarely used now). * **Investigation of Choice (IOC):** Color Doppler (Duplex) Ultrasonography. * **Homan’s Sign:** Pain in the calf on dorsiflexion of the foot (low sensitivity and specificity).

Question 216: Which of the following is a contraindication for surgical intervention in varicose veins?

A. Symptoms refractory to conservative therapy
B. Bleeding from a varix
C. Venous stasis ulcer
D. Deep venous thrombosis (Correct Answer)

Explanation: **Explanation:** The primary goal of surgical intervention in varicose veins (such as high ligation and stripping or endovenous ablation) is to eliminate refluxing superficial veins. However, this is only safe if the **deep venous system is patent and functional.** **Why D is the Correct Answer:** In patients with **Deep Venous Thrombosis (DVT)** or chronic deep venous occlusion, the superficial varicose veins often act as essential **collateral pathways** for venous return from the lower limb. If these superficial veins are surgically removed or ablated in the presence of DVT, venous outflow is severely compromised, leading to massive limb swelling, venous hypertension, and potentially phlegmasia cerulea dolens. Therefore, DVT is an absolute contraindication for varicose vein surgery. **Why Other Options are Incorrect:** * **A. Symptoms refractory to conservative therapy:** This is a primary **indication** for surgery. If compression stockings and lifestyle modifications fail to relieve pain or heaviness, intervention is warranted. * **B. Bleeding from a varix:** This is an **urgent indication** for surgery. Rupture of a superficial varix can lead to significant blood loss; once the acute bleed is controlled, definitive surgery is required to prevent recurrence. * **C. Venous stasis ulcer:** This represents CEAP Class 5 or 6 disease. Surgery is **indicated** here to reduce venous hypertension and promote ulcer healing. **High-Yield Clinical Pearls for NEET-PG:** * **Brodie-Trendelenburg Test:** Used to differentiate between saphenofemoral incompetence and deep venous insufficiency. * **Perthes Test:** Specifically used to assess the patency of the deep venous system. A positive Perthes test (increased pain/distension on walking with a tourniquet) indicates deep vein occlusion and contraindicates surgery. * **Gold Standard Investigation:** Duplex Ultrasound is the investigation of choice to confirm reflux and rule out DVT before any procedure.

Question 217: Which of the following is used for the prophylaxis of deep vein thrombosis?

A. Warfarin
B. Heparin (Correct Answer)
C. Pneumatic compression devices
D. Graded compression stockings

Explanation: **Explanation:** The prophylaxis of Deep Vein Thrombosis (DVT) is categorized into **Pharmacological** and **Mechanical** methods. While options B, C, and D are all used for prophylaxis, **Heparin** (specifically Low Dose Unfractionated Heparin or Low Molecular Weight Heparin) is considered the gold standard pharmacological agent for high-risk surgical patients. **Why Heparin is the correct answer:** Heparin acts by activating Antithrombin III, which inactivates Thrombin (Factor IIa) and Factor Xa. In the context of NEET-PG, when a question asks "which is used" and includes both drugs and devices, pharmacological prophylaxis is generally prioritized as the primary systemic intervention for preventing clot formation in high-risk scenarios. Low Molecular Weight Heparin (LMWH), such as Enoxaparin, is currently the preferred agent due to its predictable bioavailability and lower risk of Heparin-Induced Thrombocytopenia (HIT). **Analysis of Incorrect Options:** * **Warfarin (A):** It is a Vitamin K antagonist. Due to its slow onset of action (3–5 days) and the initial transient pro-coagulant state (due to Protein C and S depletion), it is **not** used for acute prophylaxis. It is primarily used for long-term maintenance therapy. * **Pneumatic Compression & Compression Stockings (C & D):** These are **mechanical prophylaxis** methods. They are used in patients with a high risk of bleeding where anticoagulants are contraindicated, or as an adjunct to heparin. They are less effective than heparin when used as monotherapy in high-risk surgical cases. **High-Yield Clinical Pearls for NEET-PG:** * **Virchow’s Triad:** Stasis, Endothelial injury, and Hypercoagulability are the three factors leading to DVT. * **Gold Standard Investigation:** Contrast Venography (rarely used now); **Duplex Ultrasound** is the initial investigation of choice. * **LMWH vs. UFH:** LMWH is preferred because it does not require routine PT/INR or aPTT monitoring. * **Treatment of Choice:** For established DVT, the treatment is therapeutic anticoagulation (Heparin bridge to Warfarin or DOACs).

Question 218: What is the most common cause of an abdominal aneurysm?

A. Atherosclerosis (Correct Answer)
B. Trauma
C. Marfan's syndrome
D. Congenital

Explanation: **Explanation:** **1. Why Atherosclerosis is Correct:** Atherosclerosis is the leading cause of Abdominal Aortic Aneurysms (AAA). The pathophysiology involves the chronic inflammation of the arterial wall, leading to the degradation of elastin and collagen by matrix metalloproteinases (MMPs). This weakens the tunica media, causing the vessel to dilate under arterial pressure. Risk factors like smoking, hypertension, and male gender further accelerate this atherosclerotic degeneration. **2. Why Other Options are Incorrect:** * **Trauma:** While trauma can cause "pseudoaneurysms" (false aneurysms) due to arterial wall injury, it is a rare cause of true abdominal aneurysms. * **Marfan’s Syndrome:** This is a connective tissue disorder (fibrillin-1 mutation) that typically leads to **cystic medial necrosis**. While it causes aneurysms, it most commonly affects the **ascending thoracic aorta**, not the abdominal aorta. * **Congenital:** Congenital aneurysms are extremely rare in the abdominal aorta; they are more commonly associated with cerebral circulation (e.g., Berry aneurysms in the Circle of Willis). **3. High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most AAAs are **infra-renal** (90%), occurring between the renal arteries and the aortic bifurcation. * **Screening:** Ultrasonography is the investigation of choice for screening. * **Surgical Threshold:** Surgery (EVAR or Open Repair) is generally indicated when the diameter is **>5.5 cm in men** or **>5.0 cm in women**, or if it grows >0.5 cm in 6 months. * **Triad of Rupture:** Hypotension, pulsatile abdominal mass, and back/abdominal pain. * **Syphilis:** Classically causes aneurysms of the **ascending aorta/arch** (Tree-bark appearance), not the abdominal aorta.

Question 219: Visceral aneurysm is most commonly seen in which of the following locations?

A. Splenic (Correct Answer)
B. Renal
C. Hepatic
D. Coronary

Explanation: **Explanation:** Visceral artery aneurysms (VAAs) are rare but clinically significant due to their risk of rupture. Among all visceral locations, the **Splenic artery** is the most common site, accounting for approximately **60%** of all visceral aneurysms. **1. Why Splenic Artery is Correct:** The splenic artery is the most frequent site for VAAs. They are more common in females (4:1 ratio) and are strongly associated with conditions that increase splenic blood flow or weaken the arterial wall, such as **pregnancy** (due to hormonal changes and portal congestion) and **portal hypertension/cirrhosis**. Most are saccular and located in the distal third of the artery. **2. Analysis of Incorrect Options:** * **Renal Artery (B):** This is the second most common site (approx. 20-25%). They are often associated with fibromuscular dysplasia and hypertension. * **Hepatic Artery (C):** These account for about 20% of VAAs. They are more common in males and are often associated with trauma, infection, or vasculitis. * **Coronary Artery (D):** While serious, coronary aneurysms are not classified as "visceral" aneurysms in the standard surgical context and are significantly rarer than splenic aneurysms. **Clinical Pearls for NEET-PG:** * **The "Double Rupture" Phenomenon:** Splenic aneurysms can rupture first into the lesser sac (contained) and then into the general peritoneal cavity (free rupture). * **Indications for Surgery:** Treatment is generally indicated if the aneurysm is **>2 cm**, in **pregnant women**, or in women of childbearing age (due to high mortality risk during pregnancy). * **Most common cause:** Medial degeneration/atherosclerosis.

Question 220: Which test is NOT used to demonstrate the presence of collateral circulation of the hand?

A. Kety Schmidt test
B. Allen's test (Correct Answer)
C. Sellick's test
D. Swan Ganz test

Explanation: The question asks which test is **NOT** used to demonstrate collateral circulation of the hand. However, there is a discrepancy in the provided key: **Allen’s test is the gold standard for assessing collateral circulation in the hand.** The correct answer to "Which is NOT used" should be any option *except* Allen's test. Based on standard surgical definitions: ### 1. The Correct Assessment: Allen’s Test **Allen’s test** is specifically designed to evaluate the patency of the radial and ulnar arteries and the adequacy of the palmar arch (collateral circulation). It is mandatory before radial artery harvesting or arterial blood gas (ABG) sampling to ensure the hand remains perfused if one artery is occluded. ### 2. Explanation of Other Options (Why they are NOT for hand collaterals): * **Kety-Schmidt Test:** This is a technique used to measure **global cerebral blood flow** and metabolic rate using nitrous oxide inhalation. It has no application in vascular surgery of the hand. * **Sellick’s Maneuver:** This refers to **cricoid pressure** used during rapid sequence induction in anesthesia to prevent gastric regurgitation. It is an airway management technique. * **Swan-Ganz Catheterization:** This involves a pulmonary artery catheter used to monitor **hemodynamic parameters** (like PCWP, cardiac output, and central venous pressure). While it involves vascular access, it does not assess hand collaterals. ### 3. High-Yield Clinical Pearls for NEET-PG: * **Modified Allen’s Test:** The most common clinical version. A refill time of **<7 seconds** is considered normal; **7–15 seconds** is equivocal; **>15 seconds** is abnormal (insufficient collateral circulation). * **Adson’s Test:** Used to diagnose **Thoracic Outlet Syndrome** (obliteration of radial pulse upon neck extension and rotation). * **Buerger’s Test:** Used to assess lower limb arterial sufficiency (Postural color change). * **Finkelshtein’s Test:** Used for **De Quervain’s tenosynovitis** (often confused with vascular tests of the wrist).

Practice by Chapter

Atherosclerotic Disease

Practice Questions

Aortic Aneurysms

Practice Questions

Peripheral Arterial Disease

Practice Questions

Carotid Artery Disease

Practice Questions

Venous Thromboembolism

Practice Questions

Chronic Venous Insufficiency

Practice Questions

Mesenteric Vascular Disease

Practice Questions

Vascular Trauma

Practice Questions

Vascular Access for Hemodialysis

Practice Questions

Endovascular Techniques

Practice Questions

Diabetic Foot Vascular Disease

Practice Questions

Vasculitis

Practice Questions

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