Vascular Surgery Practice Questions

Q: Klippel-Trenaunay syndrome is associated with all of the following except?

Fused vertebrae. **Explanation:** **Klippel-Trenaunay Syndrome (KTS)** is a rare congenital vascular disorder characterized by a classic triad of clinical features. The correct answer is **Fused vertebrae**, as it is not a component of this syndrome. Fused vertebrae (specifically cervical) are characteristic of **Klippel-Feil Syndrome**, a common distractor in exams due to the similar name. **Analysis of Options:** * **Port-wine stain (Capillary Malformation):** This is usually the first sign of KTS, present at birth. It is typically found on the affected limb and is caused by superficial capillary malformations. * **Varicose veins (Venous Malformations):** Patients develop extensive, often atypical, varicose veins. A classic finding is the **Vein of Servelle** (a persistent lateral embryonic vein). * **Limb hypertrophy (Soft tissue/Bony overgrowth):** The affected limb (usually the lower limb) undergoes hypertrophy due to increased vascularity and growth factor activity, leading to limb length discrepancy. **Clinical Pearls for NEET-PG:** 1. **Parkes-Weber Syndrome:** Often confused with KTS, it includes the same triad plus **clinically significant Arteriovenous (AV) fistulas**. KTS is primarily a low-flow malformation (no significant AV shunting). 2. **Kasabach-Merritt Syndrome:** A potential complication where large hemangiomas cause consumptive coagulopathy and thrombocytopenia. 3. **Diagnosis:** Primarily clinical; however, **Color Doppler** is the initial investigation of choice to assess venous anatomy and rule out AV fistulas. 4. **Management:** Mostly conservative (compression stockings). Surgery is reserved for severe complications.

Q: Maze operation is performed for which of the following conditions?

Atrial fibrillation. **Explanation:** The **Maze procedure** (specifically the Cox-Maze IV) is the gold-standard surgical treatment for **Atrial Fibrillation (AF)**. The underlying concept is to create a "maze" of scar tissue in the atria using incisions, radiofrequency ablation, or cryotherapy. Since scar tissue does not conduct electricity, these lines act as anatomical barriers that block the macro-reentrant circuits responsible for AF. This directs the sinus impulse along a single specified pathway to the AV node, restoring sinus rhythm and atrial transport function. **Analysis of Incorrect Options:** * **B. Complete Heart Block:** This condition involves a failure of conduction between the atria and ventricles. The standard treatment is the implantation of a **Permanent Pacemaker**, not a Maze procedure. * **C. Ebstein Anomaly:** This is a congenital malformation of the tricuspid valve and right ventricle. Surgical management involves the **Cone Procedure** (tricuspid valve repair) or valve replacement. * **D. Truncus Arteriosus:** This is a cyanotic congenital heart defect where a single vessel arises from both ventricles. The definitive treatment is the **Rastelli Procedure**, which involves closing the VSD and placing a conduit between the right ventricle and pulmonary arteries. **High-Yield Clinical Pearls for NEET-PG:** * The most common site for the origin of AF triggers is the **Pulmonary Veins**; hence, pulmonary vein isolation (PVI) is a key component of the Maze procedure. * A major benefit of the Maze procedure is the reduction of **thromboembolic risk** (stroke) by restoring atrial contraction and often involving the excision/ligation of the **Left Atrial Appendage (LAA)**. * It is frequently performed concomitantly with mitral valve surgery.

Q: Renal artery stenosis is not associated with which of the following conditions?

Marfan's syndrome. **Explanation:** Renal artery stenosis (RAS) is primarily caused by structural changes or inflammatory processes within the arterial wall. **1. Why Marfan’s Syndrome is the Correct Answer:** Marfan’s syndrome is a connective tissue disorder caused by a mutation in the **FBN1 gene (Fibrillin-1)**. Its primary vascular manifestations are **cystic medial necrosis**, leading to **aneurysms and dissections** (most commonly of the ascending aorta). While it causes arterial weakening and dilation, it is not a classic cause of luminal narrowing or stenosis of the renal arteries. **2. Analysis of Incorrect Options:** * **Atherosclerosis:** This is the **most common cause** of RAS (approx. 90%), typically involving the ostium and proximal third of the renal artery. It is most frequent in elderly males with risk factors like smoking and hypertension. * **Takayasu Arteritis:** Known as "pulseless disease," this is a large-vessel vasculitis that frequently involves the aorta and its main branches. It is a common cause of secondary hypertension in young females in Asia due to inflammatory stenosis of the renal artery. * **Polyarteritis Nodosa (PAN):** PAN is a necrotizing vasculitis of medium and small-sized arteries. It commonly affects the renal vessels, leading to microaneurysms, thrombosis, and subsequent stenosis or ischemia. **Clinical Pearls for NEET-PG:** * **Gold Standard Investigation:** Digital Subtraction Angiography (DSA). * **First-line Screening:** Duplex Doppler Ultrasound or CT Angiography. * **Fibromuscular Dysplasia (FMD):** The second most common cause of RAS overall, typically seen in young females, characterized by a **"string of beads"** appearance on angiography. * **Bruit:** A systolic-diastolic epigastric bruit is highly suggestive of RAS.

Q: A continuous murmur is found in which arterial disease?

Arteriovenous Fistula. ### Explanation **Correct Answer: C. Arteriovenous Fistula** **Mechanism:** A continuous murmur (often described as a **"machinery murmur"** or **bruit**) occurs in an **Arteriovenous (AV) Fistula** because there is a persistent pressure gradient between the high-pressure arterial system and the low-pressure venous system throughout the entire cardiac cycle. Since the pressure in the artery remains higher than in the vein during both systole and diastole, blood flows continuously through the abnormal communication, creating constant turbulence heard as a continuous murmur. **Analysis of Incorrect Options:** * **A. Atherosclerosis:** Typically produces a **systolic bruit** due to turbulent flow through a narrowed (stenosed) lumen. During diastole, the flow velocity usually drops below the threshold required to produce an audible sound. * **B. Dissecting Aortic Aneurysm:** This usually presents with a tearing chest pain. While it may cause an early diastolic murmur (due to secondary aortic regurgitation), it does not produce a continuous murmur. * **D. Thromboangiitis obliterans (Buerger’s Disease):** This is an inflammatory occlusive disease of small and medium-sized arteries. It leads to absent pulses rather than murmurs. **High-Yield Clinical Pearls for NEET-PG:** 1. **Nicoladoni-Branham Sign:** Bradycardia occurs when an AV fistula is compressed (due to a sudden increase in peripheral resistance and reflex vagal stimulation). 2. **Thrill:** A palpable vibration (thrill) is often present over an AV fistula, corresponding to the murmur. 3. **Congenital vs. Acquired:** Congenital AV fistulae are often multiple and small; acquired ones (e.g., trauma or iatrogenic for dialysis) are usually single and large. 4. **Differential Diagnosis:** Other causes of continuous murmurs include **Patent Ductus Arteriosus (PDA)** and **Venous Hum**.

Q: What is the most common cause of pseudaneurysm of the aorta?

Trauma. ### Explanation **Correct Answer: B. Trauma** A **pseudaneurysm** (false aneurysm) occurs when there is a breach in all three layers of the arterial wall (intima, media, and adventitia), leading to a contained hematoma surrounded by fibrous tissue rather than the vessel wall itself. In the aorta, the most common cause of a pseudaneurysm is **trauma**, specifically **blunt deceleration injuries** (e.g., motor vehicle accidents or falls from height). The injury typically occurs at the **aortic isthmus** (just distal to the origin of the left subclavian artery), where the mobile arch meets the fixed descending aorta. Chronic pseudaneurysms can also develop post-surgically at anastomotic sites. **Why other options are incorrect:** * **Smoking (A) and Age-related degeneration (D):** These are the primary risk factors for **true aneurysms** (e.g., Abdominal Aortic Aneurysm), where all three layers of the vessel wall remain intact but are dilated and weakened. * **Marfan’s Syndrome (C):** This is a genetic connective tissue disorder characterized by cystic medial necrosis. It typically leads to **true aneurysms** of the ascending aorta or **aortic dissection**, not primary pseudaneurysms. **High-Yield Clinical Pearls for NEET-PG:** * **True vs. False:** A true aneurysm involves all 3 layers; a false aneurysm is a pulsatile hematoma communicating with the lumen. * **Most common site of traumatic aortic rupture:** Aortic isthmus. * **Radiological Sign:** On a chest X-ray, look for a **widened mediastinum** (>8cm) as a sign of traumatic aortic injury. * **Iatrogenic causes:** Femoral artery pseudaneurysms are common after cardiac catheterization, but for the **aorta**, blunt trauma remains the classic etiology.

Q: Diabetic gangrene is caused by:

Atherosclerosis. **Explanation:** The primary underlying mechanism for diabetic gangrene is **macrovascular disease**, specifically **Atherosclerosis**. In diabetic patients, atherosclerosis occurs at an earlier age, progresses more rapidly, and is often multisegmental. It typically involves the infra-popliteal vessels (tibial and peroneal arteries). Chronic hyperglycemia leads to endothelial dysfunction and the formation of advanced glycation end-products (AGEs), which accelerate plaque formation. This results in arterial narrowing, ischemia, and eventually tissue necrosis (gangrene). **Analysis of Options:** * **A. Vasospasm:** This is a functional narrowing of vessels (e.g., Raynaud’s phenomenon) rather than a structural blockage. While microvascular dysfunction exists in diabetes, vasospasm is not the primary cause of the frank tissue death seen in diabetic gangrene. * **B. Peripheral Neuritis:** While diabetic neuropathy is a major *predisposing* factor for foot ulcers (due to loss of protective sensation and foot deformities), it does not directly cause gangrene. Neuropathy leads to the "Neuropathic Foot," but it is the ischemia from atherosclerosis that leads to the "Ischemic/Gangrenous Foot." **NEET-PG High-Yield Pearls:** * **The Diabetic Foot Triad:** Consists of **Ischemia** (Atherosclerosis), **Neuropathy** (Sensory/Motor/Autonomic), and **Infection**. * **Vessel Involvement:** Unlike smokers (who often have aorto-iliac disease), diabetics characteristically show **distal involvement** (vessels below the knee). * **Monckeberg’s Sclerosis:** Diabetics often have medial calcific sclerosis, which can lead to falsely elevated Ankle-Brachial Index (ABI) readings. * **Gas Gangrene vs. Diabetic Gangrene:** Diabetic gangrene is often a "wet gangrene" due to secondary polymicrobial infection, whereas gas gangrene is specifically caused by *Clostridium perfringens*.

Q: What is the best graft for an infrainguinal bypass approach?

Autologous vein. **Explanation:** The gold standard for infrainguinal bypass (such as femoro-popliteal or femoro-distal bypass) is the **autologous vein**, specifically the **Great Saphenous Vein (GSV)**. **Why Autologous Vein is Correct:** The primary factor determining the success of a peripheral bypass is **patency**. Autologous veins possess a viable endothelial lining that produces nitric oxide and prostacyclin, providing natural thromboresistance. They also exhibit superior compliance, matching the native artery better than synthetic materials. This leads to significantly higher long-term primary patency rates, especially when crossing the knee joint or when the distal target vessel is small. **Why Other Options are Incorrect:** * **Dacron (A) & Polyester (C):** Polyester (Dacron) is excellent for high-flow, large-diameter vessels like the aorta (e.g., AAA repair). However, in the smaller vessels of the leg, they have a high failure rate due to pseudointimal hyperplasia and increased thrombogenicity. * **PTFE (B):** Polytetrafluoroethylene is the second choice if a suitable vein is unavailable. While acceptable for bypasses *above* the knee, its patency rates are significantly inferior to veins for *below-the-knee* procedures due to the lack of an endothelial lining and increased risk of kinking. **NEET-PG High-Yield Pearls:** * **Best Conduit:** Great Saphenous Vein (GSV) is #1. If unavailable, the Small Saphenous Vein or arm veins (Cephalic/Basilic) are used. * **Techniques:** GSV can be used **"In-situ"** (valves must be lysed with a valvulotome) or **"Reversed"** (valves don't need lysis, but the caliber mismatch is greater). * **Infection:** Synthetic grafts (PTFE/Dacron) are contraindicated in an infected field; autologous veins are mandatory in such cases.

Q: Which artery is most commonly responsible for bleeding in massive hemoptysis?

Bronchial. **Explanation:** **1. Why Bronchial Artery is Correct:** Massive hemoptysis is defined as the expectoration of a large amount of blood (typically >300–600 mL in 24 hours). In approximately **90% of cases**, the source of bleeding is the **Bronchial Arteries**. Although these arteries carry only about 5% of the blood flow to the lungs, they arise directly from the systemic circulation (Aorta). Consequently, they operate under **high systemic pressure**, making any rupture or vascular erosion (often due to chronic inflammation in conditions like Bronchiectasis or TB) result in profuse, high-pressure bleeding. **2. Why Other Options are Incorrect:** * **Pulmonary Artery:** While the pulmonary circulation handles 95% of the lung's blood flow, it is a **low-pressure system**. It accounts for only about 5% of massive hemoptysis cases (e.g., Rasmussen’s aneurysm in TB). * **Intercostal Artery:** These are systemic arteries that may provide collateral circulation to the lungs in chronic inflammatory states, but they are rarely the primary source of bleeding. * **Intersegmental Artery:** These are small branches within the lung parenchyma and are not a recognized primary source for massive hemoptysis in clinical practice. **Clinical Pearls for NEET-PG:** * **Most common cause of massive hemoptysis (Worldwide):** Tuberculosis. * **Most common cause (Developed countries):** Bronchiectasis/Cystic Fibrosis. * **Investigation of choice (Initial):** CXR followed by MDCT Angiography to localize the site. * **Gold Standard Treatment:** **Bronchial Artery Embolization (BAE)** is the first-line intervention to stabilize the patient. * **Immediate Management:** Position the patient with the **bleeding side down** to protect the non-bleeding lung from aspiration.

Question 1

Klippel-Trenaunay syndrome is associated with all of the following except?

Accepted Answer

Fused vertebrae

Answer

Port wine stain

Answer

Varicose veins

Answer

Limb hypertrophy

Question 2

Maze operation is performed for which of the following conditions?

Accepted Answer

Atrial fibrillation

Answer

Complete heart block

Answer

Ebstein anomaly

Answer

Truncus arteriosus

Question 3

Renal artery stenosis is not associated with which of the following conditions?

Accepted Answer

Marfan's syndrome

Answer

atherosclerosis

Answer

polyarteritis nodosa

Answer

Takayasu arteritis

Question 4

A continuous murmur is found in which arterial disease?

Accepted Answer

Arteriovenous Fistula

Answer

Atherosclerosis

Answer

Dissecting aortic aneurysm

Answer

Thromboangiitis obliterans

Question 5

What is the most common cause of pseudaneurysm of the aorta?

Accepted Answer

Trauma

Answer

Smoking

Answer

Marfan's Syndrome

Answer

Age-related degeneration

Question 6

The "subclavian steal syndrome" occurs due to?

Accepted Answer

Occlusion of the subclavian artery proximal to the origin of the vertebral artery

Answer

Occlusion or stenosis of the vertebral artery

Answer

Occlusion or stenosis of the carotid artery

Answer

Occlusion of the subclavian artery distal to the origin of the vertebral artery

Question 7

Diabetic gangrene is caused by:

Accepted Answer

Atherosclerosis

Answer

Vasospasm

Answer

Peripheral neuritis

Answer

None of the above

Question 8

A 49-year-old man seeks a prescription for erectile dysfunction. He is 168 cm (5 feet 6 inches) tall and weighs 93 kg (body mass index 33). On physical examination, there are bilateral carotid bruits and a midline palpable abdominal pulsatile mass. Decreased hair is noted over the lower extremities, and a 1-cm shallow ulceration is present in the skin over the right first metatarsal head. He has decreased sensation to light touch and pinprick in the lower extremities. Laboratory findings include hemoglobin, 12.9 g/dL; hematocrit, 42%; WBC count, 8950/ mm3; and creatinine, 1.7 mg/dL. Which of the following laboratory findings is most likely to be present in this man?

Accepted Answer

Hemoglobin A1c, 8.8%

Answer

Oligoclonal IgG bands in CSF

Answer

Plasma ACTH, 119 pg/mL

Answer

Plasma homocysteine, 23 mmol/L

Question 9

What is the best graft for an infrainguinal bypass approach?

Accepted Answer

Autologous vein

Answer

Dacron

Answer

PTFE

Answer

Polyester

Question 10

Which artery is most commonly responsible for bleeding in massive hemoptysis?

Accepted Answer

Bronchial

Answer

Pulmonary

Answer

Intercostal

Answer

Intersegmental

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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