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: What is the best surgical approach for repairing an injury to the abdominal aorta above the level of the renal arteries, involving the superior mesenteric artery, celiac trunk, and the suprarenal branch?

Left medial visceral rotation. **Explanation:** The surgical management of retroperitoneal vascular injuries depends on the specific zone and vessels involved. **1. Why Left Medial Visceral Rotation (Mattox Maneuver) is correct:** The **Mattox maneuver** is the gold standard for exposing the entire length of the **descending thoracic and abdominal aorta**, including the **celiac trunk, superior mesenteric artery (SMA), and left renal artery**. It involves incising the lateral peritoneal reflection (White line of Toldt) on the left and rotating the colon, spleen, tail of the pancreas, and stomach medially. This provides the necessary exposure for suprarenal aortic injuries and their major branches. **2. Why the other options are incorrect:** * **Right Medial Visceral Rotation (Cattell-Braasch Maneuver):** This involves mobilizing the right colon, hepatic flexure, and the entire small bowel mesentery. It is used to expose the **infrarenal aorta, inferior vena cava (IVC)**, and the right iliac vessels. It does not provide access to the suprarenal aorta or the celiac/SMA origins. * **Right/Left Lateral Visceral Rotation:** These are not standard surgical terms for these maneuvers. The rotation is always described as "medial" because the viscera are moved toward the midline to expose the retroperitoneal structures located laterally or posteriorly. **Clinical Pearls for NEET-PG:** * **Mattox Maneuver:** Left-sided rotation; exposes the **entire abdominal aorta**. * **Cattell-Braasch Maneuver:** Right-sided rotation; exposes the **entire IVC**. * **Kocher Maneuver:** Specifically used to mobilize the duodenum and head of the pancreas to expose the **retropancreatic IVC** and the **renal hila**. * **Zone I Retroperitoneal Hematoma:** Central/Midline (contains aorta/IVC). These always require surgical exploration in blunt and penetrating trauma.

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: Critical limb ischemia results from which of the following?

Severe arterial occlusive disease. **Explanation:** **Critical Limb Ischemia (CLI)** represents the most advanced and severe stage of Peripheral Arterial Disease (PAD). It occurs when **severe arterial occlusive disease** reduces blood flow to such an extent that the resting metabolic demands of the distal tissues can no longer be met. Unlike intermittent claudication, which occurs during exercise, CLI signifies that the perfusion pressure has fallen below the threshold required to maintain tissue viability at rest. * **Why Option C is correct:** CLI is clinically defined by the presence of **ischemic rest pain** (typically requiring narcotics for >2 weeks) or **tissue loss** (ulceration or gangrene). This state only occurs when there is multilevel or high-grade arterial obstruction, leading to an Ankle-Brachial Index (ABI) typically below 0.4 and a toe pressure below 30 mmHg. * **Why Options A and B are incorrect:** Mild to moderate arterial disease usually presents as either asymptomatic disease or **intermittent claudication**. In these stages, the collateral circulation is sufficient to maintain tissue integrity at rest, but cannot meet the increased oxygen demand during exertion. **Clinical Pearls for NEET-PG:** 1. **Fontaine Classification:** CLI corresponds to Stage III (Rest pain) and Stage IV (Ulceration/Gangrene). 2. **Rutherford Classification:** CLI corresponds to Categories 4, 5, and 6. 3. **The "6 Ps":** While CLI is a chronic process, the "6 Ps" (Pain, Pallor, Pulselessness, Paresthesia, Paralysis, Poikilothermia) are used to identify *Acute* Limb Ischemia, which is a surgical emergency. 4. **Management:** The primary goal in CLI is urgent revascularization (endovascular or bypass) to prevent major limb amputation.

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.

Question 1

A 52-year-old, nonsmoking man complains of pain and paresthesias in his right hand, particularly at night. Examination reveals a diminished radial pulse when he abducts his arm with his head turned to either side. A bruit is audible over the upper right anterior chest. His neurologic examination is unremarkable. What is the suspected diagnosis?

Accepted Answer

A cervical rib

Answer

A Pancoast tumor

Answer

Cervical disc disease

Answer

Subclavian steal syndrome

Question 2

Which vein is preferable for coronary bypass grafting?

Accepted Answer

Saphenous vein

Answer

Short saphenous vein

Answer

Epigastric vessels

Answer

Radial artery

Question 3

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 4

What is the best surgical approach for repairing an injury to the abdominal aorta above the level of the renal arteries, involving the superior mesenteric artery, celiac trunk, and the suprarenal branch?

Accepted Answer

Left medial visceral rotation

Answer

Right medial visceral rotation

Answer

Right lateral visceral rotation

Answer

Left lateral visceral rotation

Question 5

'SEPS' is a surgical procedure used in the treatment of which of the following conditions?

Accepted Answer

Venous incompetence

Answer

Aerial obstruction

Answer

Lymphatic obstruction

Answer

AV fistula

Question 6

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 7

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 8

Critical limb ischemia results from which of the following?

Accepted Answer

Severe arterial occlusive disease

Answer

Mild arterial occlusive disease

Answer

Moderate arterial occlusive disease

Answer

All of the above

Question 9

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 10

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

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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