Vascular Surgery Practice Questions

Q: Which vein is preferable for coronary bypass grafting?

Saphenous vein. The **Great Saphenous Vein (GSV)** remains the most commonly used conduit for Coronary Artery Bypass Grafting (CABG) due to its length, ease of harvest, and diameter, which matches coronary arteries well. ### Why the Saphenous Vein is Correct: The GSV is the "gold standard" venous conduit because it is superficial, easily accessible, and provides sufficient length for multiple grafts. It has a thick muscular wall compared to other veins, allowing it to withstand arterial pressures better (arterialization). While the **Internal Thoracic Artery (ITA)** is the overall best conduit for long-term patency, the GSV is the preferred *venous* choice. ### Why Other Options are Incorrect: * **Short Saphenous Vein:** It is shorter, thinner, and its anatomical position (posterior leg) makes harvesting difficult during simultaneous cardiac surgery. * **Epigastric Vessels:** The Inferior Epigastric Artery is sometimes used as an arterial graft, but it is technically challenging to harvest and lacks the length and reliability of the GSV. * **Radial Artery:** This is an **arterial** conduit, not a vein. While it has better patency rates than veins, it is prone to vasospasm and requires a preoperative Allen’s test to ensure adequate ulnar collateral flow. ### High-Yield Clinical Pearls for NEET-PG: * **Best Patency:** The **Left Internal Mammary Artery (LIMA)** to the LAD has the highest 10-year patency rate (>90%). * **Reversal:** When using the GSV, it must be **reversed** (or valves must be lysed) to prevent valves from obstructing blood flow. * **Harvesting:** Endoscopic Vein Harvesting (EVH) is now preferred over open harvesting to reduce wound complications. * **Site:** The GSV is located **anterior** to the medial malleolus at the ankle.

Q: Which of the following is NOT a consequence of chronic edema of the legs?

Varicose veins. **Explanation:** The core concept to understand here is the **direction of causality**. Chronic edema is a *result* of underlying pathology, not the cause of varicose veins. **1. Why Varicose Veins is the Correct Answer:** Varicose veins are a **cause** of chronic edema, not a consequence. In chronic venous insufficiency (CVI), valvular incompetence leads to venous hypertension. This increased hydrostatic pressure forces fluid into the interstitial space, resulting in edema. Therefore, while edema is a hallmark sign of varicose veins, the reverse is not true; chronic swelling from other causes (like lymphedema or heart failure) does not cause veins to become dilated and tortuous. **2. Analysis of Incorrect Options (Consequences of Edema):** * **Thickening of the skin:** Chronic edema leads to **lipodermatosclerosis**. Persistent fluid accumulation triggers fibroblast proliferation and collagen deposition, causing the skin to become thick, fibrotic, and "woody." * **Soft tissue infections:** Edema compromises local lymphatic drainage and skin integrity. This creates a protein-rich environment ideal for bacterial growth, making patients highly susceptible to recurrent **cellulitis** and lymphangitis. * **Marjolin’s ulcer:** This refers to a squamous cell carcinoma arising in areas of chronic inflammation or chronic wounds. Chronic venous edema leads to venous ulcers; if these ulcers remain unhealed for decades, they can undergo malignant transformation into a Marjolin’s ulcer. **Clinical Pearls for NEET-PG:** * **Stemmer’s Sign:** Inability to pinch the skin on the dorsal surface of the second toe; a pathognomonic sign of chronic lymphedema. * **Gaiter Zone:** The lower third of the leg (medial malleolus) where chronic edema most commonly leads to venous ulceration. * **Inverted Champagne Bottle Appearance:** A classic description of the leg in advanced lipodermatosclerosis due to chronic edema and fibrosis.

Q: Which of the following is a true statement regarding Buerger's disease?

Involves small and medium-sized vessels. **Explanation:** **Buerger’s Disease**, also known as **Thromboangiitis Obliterans (TAO)**, is a non-atherosclerotic, segmental, inflammatory disease that primarily affects the **small and medium-sized arteries and veins** of the distal extremities (hands and feet). 1. **Why Option A is correct:** The hallmark of TAO is a highly cellular, "soft" inflammatory thrombus that occludes the lumen of small and medium-sized vessels (e.g., radial, ulnar, tibial, and peroneal arteries). Unlike atherosclerosis, the internal elastic lamina remains intact. 2. **Why Options B, C, and D are incorrect:** * **Distribution (B):** While the upper limbs are frequently involved (a key diagnostic differentiator from atherosclerosis), the **lower limbs** are still more commonly affected first. * **Gender (C & D):** Historically, Buerger’s disease is overwhelmingly **more common in males** (typically <45 years old) who are heavy smokers. While the incidence in females is rising due to increased smoking habits, it remains a predominantly male-centric disease. **High-Yield Clinical Pearls for NEET-PG:** * **Strongest Risk Factor:** Heavy tobacco use (smoking or chewing) is essential for diagnosis and progression. * **Triad of TAO:** Distal ischemia (claudication/ulcers), Raynaud’s phenomenon, and **Migratory Superficial Thrombophlebitis**. * **Angiographic Sign:** "Corkscrew collaterals" (Martorell’s sign) due to recanalization of the occluded segments. * **Allen’s Test:** Often positive, indicating distal ulnar or radial artery occlusion. * **Treatment:** The only definitive treatment is **absolute smoking cessation**. Sympathectomy may be used for symptomatic relief in vasospastic cases.

Q: Sympathectomy is indicated in which of the following conditions?

All of the above. **Explanation:** The primary objective of a **sympathectomy** is to eliminate sympathetic vasoconstrictor tone, thereby inducing vasodilation and increasing skin blood flow. This procedure is indicated in conditions where vasospasm or chronic arterial occlusion limits peripheral perfusion, particularly in the upper and lower limbs. * **Buerger’s Disease (Thromboangiitis Obliterans):** In this non-atherosclerotic inflammatory disease, sympathectomy is used as a palliative measure. While it does not cure the underlying arterial inflammation, it helps improve collateral circulation, aids in the healing of small ischemic ulcers, and provides relief from rest pain. * **Atherosclerosis producing ischemia:** In patients with peripheral arterial disease (PAD) who are not candidates for reconstructive surgery (distal disease), lumbar sympathectomy can improve cutaneous blood flow. It is specifically beneficial for "rest pain" and superficial ischemic ulcers, though it rarely improves intermittent claudication (as muscle blood flow is regulated by metabolites rather than the sympathetic system). * **Raynaud’s Disease:** This is a vasospastic disorder. Cervicothoracic sympathectomy is indicated when medical management fails and there is a risk of digital gangrene. **Clinical Pearls for NEET-PG:** 1. **Level of Sympathectomy:** For the lower limb, the **L2-L4 ganglia** are removed (L1 is preserved in males to prevent loss of ejaculation). For the upper limb, the **T2-T3 ganglia** are targeted. 2. **Stellate Ganglion:** Removal of the T1 ganglion (Stellate) is usually avoided to prevent **Horner’s Syndrome**. 3. **Key Limitation:** Sympathectomy increases **skin** blood flow but has **no effect on muscle blood flow**; therefore, it is NOT effective for treating intermittent claudication.

Q: Thrombophlebitis extending from the thigh to involve the iliofemoral vein causes which of the following conditions?

White leg. **Explanation:** The correct answer is **White leg**, clinically known as **Phlegmasia Alba Dolens**. **1. Why "White Leg" is Correct:** Phlegmasia Alba Dolens (White leg) occurs when extensive deep vein thrombosis (DVT) involves the **iliofemoral segment**. The massive clot causes significant obstruction to venous outflow. This leads to a rapid increase in interstitial pressure, which eventually compresses the **capillary beds and small arterioles**. The resulting ischemia and lack of arterial blood flow give the limb a characteristic pale, milky-white appearance. It is classically associated with pregnancy (traditionally called "milk leg"). **2. Analysis of Incorrect Options:** * **Blue leg (Phlegmasia Cerulea Dolens):** This is a more severe progression of the condition. It involves total or near-total occlusion of all venous tributaries (including collaterals). This leads to profound venous congestion, cyanosis, and severe pain. It often progresses to venous gangrene. * **Red leg:** This is typically associated with **Cellulitis** or superficial thrombophlebitis, where localized inflammation and vasodilation cause erythema. * **Purple leg:** This is not a standard clinical term in vascular surgery but may be seen in the transition phase between Alba and Cerulea dolens as cyanosis sets in. **3. NEET-PG Clinical Pearls:** * **Phlegmasia Alba Dolens:** "Alba" = White. Key features: Pain, Edema, Pallor. Arterial pulses may be weak but are usually present. * **Phlegmasia Cerulea Dolens:** "Cerulea" = Blue. Key features: Severe pain, Cyanosis, and risk of Gangrene. This is a surgical emergency. * **Most common site for DVT:** Left iliac vein (due to compression by the right common iliac artery, known as **May-Thurner Syndrome**). * **Investigation of choice:** Duplex Ultrasonography. Gold standard is Contrast Venography.

Q: Lower leg perforators are named after which of the following?

Cockett. **Explanation:** Perforating veins are crucial vessels that connect the superficial venous system to the deep venous system by piercing the deep fascia. In the lower limb, these are categorized based on their anatomical location. **1. Why Cockett is Correct:** **Cockett’s perforators** are specifically located in the **lower leg** (posterior arch vein). They connect the Great Saphenous vein (GSV) territory to the deep posterior tibial veins. They are clinically significant as they are frequently involved in the development of venous ulcers (Gaiter zone). They are divided into Upper, Middle, and Lower Cockett perforators, located approximately 13.5 cm, 8.5 cm, and 5 cm above the medial malleolus, respectively. **2. Analysis of Incorrect Options:** * **Boyd’s Perforators:** These are located in the **upper medial calf** (just below the knee), connecting the GSV to the posterior tibial veins. * **Dodd’s Perforators:** These are located in the **lower thigh** (distal third), connecting the GSV to the femoral vein within the adductor (Hunterian) canal. * **May or Kuster Perforators:** These are located in the **ankle** region, specifically connecting the GSV to the deep veins at the level of the medial malleolus. **Clinical Pearls for NEET-PG:** * **Direction of Flow:** In healthy individuals, blood flows from the superficial to the deep system. Valvular incompetence in perforators leads to "outward" flow, causing superficial varicosities and skin changes. * **Hunterian Perforator:** Located in the mid-thigh. * **Gaiter Zone:** The area of the lower leg (medial aspect) most prone to venous stasis and ulceration, primarily due to Cockett’s perforator incompetence. * **Trendelenburg Test:** Used clinically to differentiate between saphenofemoral incompetence and perforator incompetence.

Q: What is the term for fan-shaped patterns of small intradermal veins on the medial or lateral aspect of the ankle?

Corona phlebectasia. **Explanation:** **Corona phlebectasia** (also known as *Corona phlebectatica paraplantaris*) is the correct term for the fan-shaped pattern of small, dilated intradermal veins found on the medial or lateral aspects of the ankle and foot. It is a clinical sign of chronic venous insufficiency (CVI) and is classified as **C1** in the CEAP classification. It typically results from the incompetence of the perforating veins and the saphenous system, leading to high pressure in the dermal venous plexus. **Analysis of Incorrect Options:** * **Saphena varix:** This is a saccular aneurysm or localized dilation of the Great Saphenous Vein at its junction with the femoral vein (Saphenofemoral junction). It presents as a soft swelling in the groin that disappears on lying down and exhibits a cough impulse. * **Hyphen webs:** This is an older, less specific term sometimes used to describe telangiectasias or spider veins, but it does not specifically refer to the fan-shaped ankle distribution characteristic of Corona phlebectasia. * **Dermal flare:** While "flare" is often used colloquially to describe redness or telangiectasias, it is not the formal anatomical term for this specific ankle venous pattern. **High-Yield Clinical Pearls for NEET-PG:** * **CEAP Classification:** Remember that Corona phlebectasia is a strong clinical predictor of advanced venous disease (often progressing to C4-C6, i.e., skin changes and ulcers). * **Location:** It is most commonly seen on the **medial** aspect of the ankle. * **Significance:** Its presence indicates significant underlying venous hypertension, even if large varicose veins are not visible.

Q: What is the most common type of primary lymphedema?

Lymphedema precox. **Explanation:** Primary lymphedema is a developmental abnormality of the lymphatic system, classified based on the age of onset. **Lymphedema Precox (Option B)** is the most common type of primary lymphedema, accounting for approximately **65–80% of cases**. It is defined by an onset between the ages of 1 and 35 years. It typically manifests during puberty or pregnancy, suggesting a hormonal influence on lymphatic demand. It is more common in females and usually presents as unilateral swelling of the lower limbs. **Why other options are incorrect:** * **Lymphedema Congenita (Option A):** This accounts for about 10–15% of cases. It is present at birth or manifests within the first year of life. When it is familial (autosomal dominant), it is known as **Milroy’s disease**. * **Lymphedema Tarda (Option C):** This is the rarest form (approx. 10%), occurring after the age of 35. It is often associated with a defect in the lymphatic valves. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of lymphedema worldwide:** Filariasis (*Wuchereria bancrofti*). * **Most common cause of lymphedema in developed countries:** Secondary to malignancy or its treatment (e.g., Axillary lymph node dissection for Breast Cancer). * **Stemmer’s Sign:** Inability to pinch the skin on the dorsal surface of the base of the second toe; a pathognomonic clinical sign of lymphedema. * **Stewart-Treves Syndrome:** A rare, highly aggressive angiosarcoma arising in a limb with chronic long-standing lymphedema.

Question 1

Which vein is preferable for coronary bypass grafting?

Accepted Answer

Saphenous vein

Answer

Short saphenous vein

Answer

Epigastric vessels

Answer

Radial artery

Question 2

Intestinal angina is a symptom complex of which of the following?

Accepted Answer

Postprandial abdominal pain, weight loss, chronic mesenteric vessel occlusion

Answer

Postprandial abdominal pain, weight loss, acute mesenteric vessel occlusion

Answer

Preprandial abdominal pain, weight loss, chronic mesenteric vessel occlusion

Answer

Postprandial abdominal pain, weight gain, acute mesenteric vessel occlusion

Question 3

Which of the following is NOT a consequence of chronic edema of the legs?

Accepted Answer

Varicose veins

Answer

Marjolin's ulcer

Answer

Thickening of the skin

Answer

Soft tissue infections

Question 4

Which of the following is a true statement regarding Buerger's disease?

Accepted Answer

Involves small and medium-sized vessels

Answer

More commonly involves the upper limbs than the lower limbs

Answer

Common in males

Answer

Common in females

Question 5

Sympathectomy is indicated in which of the following conditions?

Accepted Answer

All of the above

Answer

Buerger’s disease

Answer

Atherosclerosis producing ischemia of limbs

Answer

Raynaud’s disease

Question 6

Thrombophlebitis extending from the thigh to involve the iliofemoral vein causes which of the following conditions?

Accepted Answer

White leg

Answer

Red leg

Answer

Blue leg

Answer

Purple leg

Question 7

Lower leg perforators are named after which of the following?

Accepted Answer

Cockett

Answer

Boyd

Answer

Dodd

Answer

May or Kuster

Question 8

What is the term for fan-shaped patterns of small intradermal veins on the medial or lateral aspect of the ankle?

Accepted Answer

Corona phlebectasia

Answer

Saphena varix

Answer

Hyphen webs

Answer

Dermal flare

Question 9

What is the most common type of primary lymphedema?

Accepted Answer

Lymphedema precox

Answer

Lymphedema congenital

Answer

Lymphedema tarda

Answer

None of the above

Question 10

What is the primary surgical procedure for managing varicose veins?

Accepted Answer

Stripping

Answer

Multiple subcutaneous ligatures

Answer

Subfascial ligatures

Answer

Division and ligation of the superficial venous system

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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