Vascular Surgery Practice Questions

Q: What is the most common site of subclavian artery obstruction in subclavian steal syndrome?

First part. **Explanation:** **Subclavian Steal Syndrome (SSS)** occurs due to a high-grade stenosis or total occlusion of the subclavian artery **proximal** to the origin of the **vertebral artery**. 1. **Why the First Part is Correct:** The subclavian artery is divided into three parts by the scalenus anterior muscle. The **first part** (medial to the muscle) is the segment from which the vertebral artery originates. For "steal" to occur, the obstruction must be proximal to this takeoff. When the first part is blocked, the pressure in the distal subclavian artery drops. During exercise of the ipsilateral arm, blood is "stolen" from the contralateral vertebral artery; it flows retrogradely down the ipsilateral vertebral artery to supply the arm, leading to vertebrobasilar insufficiency (dizziness, syncope). 2. **Why Other Options are Incorrect:** * **Second Part:** This lies posterior to the scalenus anterior. Obstruction here is distal to the vertebral artery origin; therefore, it would cause limb ischemia but **not** retrograde vertebral flow (no "steal"). * **Third Part:** This lies lateral to the scalenus anterior. Similar to the second part, it is distal to the vertebral origin. * **Fourth Part:** Anatomically, the subclavian artery only has three parts. **Clinical Pearls for NEET-PG:** * **Most common side:** Left side (due to direct aortic origin and sharper angulation). * **Clinical Sign:** A significant difference in blood pressure between the two arms (usually >20 mmHg). * **Diagnosis:** Duplex Ultrasonography is the initial screening tool (shows retrograde flow); Digital Subtraction Angiography (DSA) is the gold standard. * **Association:** Often associated with atherosclerosis (elderly) or Takayasu arteritis (younger females).

Q: Trendelenburg's operation is indicated in the treatment of:

Varicose veins. **Explanation:** **Trendelenburg’s operation**, also known as **Juxta-femoral flush ligation**, is a classic surgical procedure for **Varicose Veins**. It is specifically indicated when there is **Saphenofemoral Junction (SFJ) incompetence**. The procedure involves ligating the Great Saphenous Vein (GSV) exactly at its confluence with the Common Femoral Vein. A critical step is the ligation of all proximal tributaries (e.g., superficial circumflex iliac, superficial epigastric, and pudendal veins) to prevent future recurrence via collateral circulation. **Analysis of Options:** * **Deep Vein Thrombosis (A):** Surgery is rarely the primary treatment. Management focuses on anticoagulation (heparin/warfarin). Trendelenburg’s operation is contraindicated in DVT because the superficial system acts as a vital collateral pathway when deep veins are occluded. * **Buerger’s Disease (B):** Also known as Thromboangiitis Obliterans (TAO), this is an occlusive arterial disease. Treatment involves smoking cessation and lumbar sympathectomy, not venous ligation. * **Obturator Hernia (D):** While the "Howship-Romberg sign" is associated with this hernia, the "Trendelenburg sign/test" refers to hip stability or venous assessment. There is no "Trendelenburg operation" for hernias. **High-Yield Clinical Pearls for NEET-PG:** * **Trendelenburg Test:** Used to differentiate between SFJ incompetence and perforator incompetence. * **Brodie-Trendelenburg Test:** Specifically assesses the valvular competency of the GSV and communicating veins. * **Modern Trend:** While the Trendelenburg operation is historically significant, it is now frequently replaced by minimally invasive endovenous thermal ablation (EVLA or RFA). * **Distinction:** Do not confuse the **Trendelenburg Operation** (vascular) with the **Trendelenburg Position** (head-down tilt) or the **Trendelenburg Sign** (gluteus medius palsy).

Q: Three days after undergoing an operation for an abdominal aortic aneurysm, a patient has moderate fever, abdominal pain, and rectal bleeding. What is the most helpful investigation?

Sigmoidoscopy. **Explanation:** The clinical presentation of fever, abdominal pain, and rectal bleeding following an abdominal aortic aneurysm (AAA) repair is highly suggestive of **Ischemic Colitis**. This is a known complication occurring in 1–2% of elective cases and up to 10% of emergency repairs for ruptured aneurysms. **Why Sigmoidoscopy is the Correct Answer:** The most common site affected is the **sigmoid colon** because the **Inferior Mesenteric Artery (IMA)** is frequently ligated during AAA repair. While collateral circulation usually suffices, inadequate flow leads to ischemia. **Sigmoidoscopy** (flexible or rigid) is the investigation of choice because it allows direct visualization of the colonic mucosa to identify signs of ischemia, such as cyanosis, friability, or ulceration. It is performed without bowel preparation to avoid increasing intraluminal pressure. **Why Other Options are Incorrect:** * **Angiography (A):** Ischemic colitis is usually a low-flow state or due to ligation, not necessarily an acute arterial occlusion that requires mapping. It is invasive and delays diagnosis. * **Upper GI Endoscopy (B):** Rectal bleeding and lower abdominal pain point toward a pathology distal to the ligament of Treitz; UGI endoscopy would not reach the site of ischemia. * **Abdominal Ultrasound (C):** It is non-specific and cannot reliably evaluate mucosal integrity or diagnose early bowel ischemia. **NEET-PG High-Yield Pearls:** * **Watershed Areas:** The most vulnerable areas for colonic ischemia are **Griffith’s point** (splenic flexure) and **Sudek’s point** (rectosigmoid junction). * **IMA Ligation:** The risk of ischemia increases if the Internal Iliac arteries are also compromised. * **Management:** Mild cases are managed conservatively (NPO, antibiotics); full-thickness gangrene requires laparotomy and resection (Hartmann’s procedure).

Q: What is true about lymphangioma?

It is a congenital sequestration of lymphatic channels.. **Explanation:** **Lymphangiomas** are benign malformations of the lymphatic system, rather than true neoplasms. 1. **Why Option B is correct:** Lymphangiomas arise due to the **congenital sequestration of lymphatic channels**. During embryonic development, certain lymphatic buds fail to establish a connection with the main lymphatic system. These sequestered primitive lymphatic sacs continue to produce lymph but lack drainage, leading to the formation of cystic or cavernous spaces. They are most commonly found in the neck (Cystic Hygroma). 2. **Why other options are incorrect:** * **Option A:** Lymphangiomas are strictly **benign** lesions. They do not metastasize, though they can be locally infiltrative and cross anatomical planes. * **Option C:** While lasers (like CO2 or Nd:YAG) are sometimes used for superficial mucosal lymphangiomas, **surgical excision** (complete removal) remains the gold standard for definitive treatment. Laser is not the primary "excision" modality for deep-seated cystic hygromas. * **Option D:** While sclerotherapy (using agents like OK-432, Bleomycin, or Doxycycline) is an emerging treatment, it is primarily effective for **macrocystic** types. However, in the context of standard surgical teaching and classical MCQ patterns, the **pathological definition** (Option B) is considered the "most true" fundamental fact about the disease. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Posterior triangle of the neck (Cystic Hygroma). * **Clinical Sign:** They are brilliantly **transilluminant** because they contain clear lymph. * **Classification:** Capillary (simple), Cavernous, and Cystic (Cystic Hygroma). * **Complications:** Sudden increase in size usually indicates hemorrhage into the cyst or secondary infection. * **Association:** Often associated with chromosomal abnormalities like **Turner syndrome** and Down syndrome.

Q: Critical limb ischemia occurs when the ankle brachial index falls to below?

0.3. **Explanation:** **Ankle-Brachial Index (ABI)** is the ratio of the systolic blood pressure at the ankle to the systolic blood pressure in the arm. It is the primary non-invasive screening tool for Peripheral Arterial Disease (PAD). 1. **Why 0.3 is correct:** Critical Limb Ischemia (CLI) represents the end-stage of PAD, characterized by rest pain, ulceration, or gangrene. It is clinically defined by an **ABI < 0.3** (or an absolute ankle pressure < 50 mmHg). At this level, the perfusion pressure is insufficient to maintain tissue viability even at rest, leading to a high risk of limb loss. 2. **Analysis of Incorrect Options:** * **0.5:** An ABI between **0.4 and 0.9** typically correlates with **Intermittent Claudication**. While 0.5 indicates significant disease, it does not meet the threshold for "critical" ischemia unless tissue loss is present. * **0.9:** This is the **cutoff for diagnosing PAD**. An ABI of 0.91–1.30 is considered normal/borderline. Any value ≤ 0.90 is diagnostic of PAD. * **1.0:** This is a **normal** value. A normal ABI range is generally 1.0–1.3. **High-Yield Clinical Pearls for NEET-PG:** * **ABI > 1.3:** Suggests **calcified, non-compressible vessels** (commonly seen in Diabetics and Chronic Kidney Disease). In such cases, **Toe-Brachial Index (TBI)** is more reliable. * **CLI Definition:** Requires symptoms for >2 weeks plus hemodynamic evidence (ABI < 0.4, Ankle pressure < 50 mmHg, or Toe pressure < 30 mmHg). * **TASC II Classification:** Used to guide management (Endovascular vs. Surgical) based on lesion length and location. * **Leriche Syndrome Triad:** Claudication (buttock/thigh), Impotence, and absent femoral pulses (Aortoiliac occlusion).

Q: Which drug is used for Buerger's disease?

Xanthinol nicotinate. **Explanation:** **Buerger’s Disease (Thromboangiitis Obliterans - TAO)** is a non-atherosclerotic, segmental, inflammatory disease that primarily affects small and medium-sized arteries and veins of the extremities. It is strongly associated with heavy tobacco use. **Why Xanthinol Nicotinate is correct:** Xanthinol nicotinate is a peripheral vasodilator. It acts by causing direct relaxation of the vascular smooth muscles and improving peripheral blood flow. In Buerger’s disease, where there is significant ischemia due to vessel narrowing, vasodilators are used as adjuvant therapy to improve distal perfusion and relieve rest pain. Other drugs used in TAO include **Iloprost** (a prostacyclin analogue) and **Cilostazol** (a PDE3 inhibitor). **Why the other options are incorrect:** * **Propranolol:** This is a non-selective beta-blocker. It is generally **contraindicated** in peripheral vascular diseases like Buerger’s because blocking beta-2 receptors leads to unopposed alpha-adrenergic activity, causing further vasoconstriction and worsening ischemia. * **Glyceryl Trinitrate (GTN):** While GTN is a potent vasodilator, it acts primarily on the venous system and coronary arteries. It is not a standard or effective treatment for the chronic, segmental arterial inflammation seen in Buerger’s disease. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Treatment:** The only definitive way to stop disease progression is **absolute smoking cessation**. * **Classic Presentation:** Young male smoker with a triad of distal ischemia (claudication/ulcers), Raynaud’s phenomenon, and **migratory superficial thrombophlebitis**. * **Angiographic Finding:** "Corkscrew collaterals" (Martorell’s sign). * **Surgical Option:** Lumbar Sympathectomy (to relieve pain and improve skin perfusion) or Omental Transposition.

Question 1

A drug abuser developed a pseudoaneurysm. Which of the following should be included in the treatment modalities?

Accepted Answer

Ligation of the involved vessel and wide surgical debridement

Answer

Exposure and ligation with subsequent revascularization

Answer

Direct interposition graft with synthetic material in the groin for revascularization

Answer

Direct interposition graft with autogenous graft

Question 2

In Buerger disease, which is the site of pain?

Accepted Answer

Calf pain

Answer

Foot pain

Answer

Hand pain

Answer

Thigh pain

Question 3

What is the most common site of subclavian artery obstruction in subclavian steal syndrome?

Accepted Answer

First part

Answer

Second part

Answer

Third part

Answer

Fourth part

Question 4

Trendelenburg's operation is indicated in the treatment of:

Accepted Answer

Varicose veins

Answer

Deep vein thrombosis

Answer

Buerger's disease

Answer

Obturator hernia

Question 5

Three days after undergoing an operation for an abdominal aortic aneurysm, a patient has moderate fever, abdominal pain, and rectal bleeding. What is the most helpful investigation?

Accepted Answer

Sigmoidoscopy

Answer

Angiography

Answer

Upper GI endoscopy

Answer

Abdominal ultrasound

Question 6

What is true about lymphangioma?

Accepted Answer

It is a congenital sequestration of lymphatic channels.

Answer

It is a malignant tumor.

Answer

Laser excision is a treatment modality.

Answer

Sclerotherapy is a commonly employed treatment.

Question 7

Critical limb ischemia occurs when the ankle brachial index falls to below?

Accepted Answer

0.3

Answer

0.5

Answer

0.9

Answer

1.0

Question 8

What is the suture of choice for vascular anastomosis?

Accepted Answer

Polypropylene

Answer

Chromic catgut

Answer

Silk

Answer

Nylon

Question 9

Which drug is used for Buerger's disease?

Accepted Answer

Xanthinol nicotinate

Answer

Propranolol

Answer

Glyceryl trinitrate

Answer

All the above

Question 10

Pain in varicose veins is due to all EXCEPT:

Accepted Answer

Increased capillary permeability

Answer

Increased venous wall tension

Answer

Hyperviscosity of RBCs

Answer

Hypoxia of tunica media of venous wall

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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