Vascular Surgery Practice Questions

Q: Lymphovenous anastomosis is done for:

Filarial lymphedema. **Explanation:** **Lymphovenous Anastomosis (LVA)** is a specialized super-microsurgical procedure used to treat obstructive lymphedema. The underlying concept involves bypassing the lymphatic obstruction by creating a shunt between the congested lymphatic vessels and the nearby subdermal venules. This allows the trapped lymph fluid to drain directly into the venous system, reducing limb girth and the frequency of cellulitis. * **Why Option D is Correct:** In **Filarial Lymphedema**, the *Wuchereria bancrofti* parasite causes chronic inflammation and fibrosis of the lymph nodes and vessels, leading to mechanical obstruction. LVA is most effective in early-stage (Stage I-III) lymphedema where lymphatic vessels are still functional and not yet completely obliterated by extensive fibrosis. **Why the other options are incorrect:** * **A. Ascites:** This is the accumulation of fluid in the peritoneal cavity, usually due to portal hypertension or malignancy. It is managed with diuretics, paracentesis, or a TIPS procedure, not peripheral lymphovenous shunts. * **B. Varicose Veins:** This is a venous pathology caused by valvular incompetence. Treatment involves compression, sclerotherapy, or venous ablation (EVLA/RFA), not lymphatic surgery. * **C. Leprosy:** While leprosy can cause trophic ulcers and nerve palsies, it does not primarily cause the type of lymphatic obstruction treated by LVA. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Lymphoscintigraphy is the investigation of choice to confirm lymphatic obstruction before LVA. * **Indication:** LVA is best suited for **Secondary Lymphedema** (post-filarial or post-mastectomy). * **Charles Operation:** A radical surgery (excision of skin and subcutaneous tissue down to the fascia) used for late-stage, "woody" lymphedema where LVA is no longer feasible. * **Drug of Choice for Filariasis:** Diethylcarbamazine (DEC).

Q: Following aortic reconstruction, the viability of the sigmoid colon can most reliably be evaluated by?

Postoperative sigmoidoscopy. **Explanation:** Ischemic colitis is a significant complication following abdominal aortic aneurysm (AAA) repair, occurring in approximately 1–7% of cases due to the ligation of the Inferior Mesenteric Artery (IMA). **Why Postoperative Sigmoidoscopy is Correct:** Postoperative fiberoptic sigmoidoscopy is the **gold standard** and most reliable method for evaluating sigmoid viability. It allows for direct visualization of the mucosa, which is the layer most sensitive to ischemia. Clinical signs are often masked by postoperative analgesia, and intraoperative assessments can be deceptive. Sigmoidoscopy can identify various grades of ischemia—from mucosal hyperemia and submucosal hemorrhage to frank gangrene—allowing for timely surgical intervention (resection) if transmural necrosis is present. **Why Other Options are Incorrect:** * **IMA Stump Pressure (A):** While a mean pressure >40 mmHg suggests adequate collateral flow from the SMA (via the marginal artery of Drummond), it is a physiological measurement, not a direct assessment of tissue viability. * **Doppler Arterial Signal (B):** The presence of a Doppler signal indicates blood flow in the mesentery but does not guarantee adequate microvascular perfusion to the bowel wall itself. * **Observation of Peristalsis (C):** Peristalsis and bowel color are notoriously unreliable intraoperative indicators. A bowel may appear pink and peristaltic initially but still undergo delayed ischemic necrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of ischemia:** The **Griffith’s point** (splenic flexure) and **Sudek’s point** (rectosigmoid junction) are the most vulnerable watershed areas. * **Early Sign:** Bloody diarrhea in the early postoperative period is a classic warning sign of ischemic colitis. * **Management:** Mucosal ischemia is managed conservatively; transmural gangrene requires immediate laparotomy and Hartmann’s procedure.

Q: What is the characteristic angiographic finding in Buerger's disease?

Corkscrew arteries. **Explanation:** **Buerger’s Disease (Thromboangiitis Obliterans)** 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 "Corkscrew Arteries" is correct:** In Buerger’s disease, chronic inflammation leads to segmental occlusions of the distal vessels. To bypass these obstructions, the body develops **tortuous, spiral-shaped collateral vessels**. On angiography, these characteristic collaterals are described as **"corkscrew" or "root-like"** appearances (Martorell’s sign). These are not the original arteries but rather the compensatory collateral circulation. **Analysis of Incorrect Options:** * **B. Beaded arteries:** This is the classic angiographic finding in **Fibromuscular Dysplasia (FMD)**, caused by alternating areas of stenosis and aneurysmal dilatation (the "string of beads" appearance). * **C. Stenosed arteries:** While stenosis occurs in Buerger’s, it is a non-specific finding seen in Atherosclerosis and various vasculitides. It is not the "characteristic" diagnostic sign. * **D. Arterial dissection:** This refers to a tear in the tunica intima (e.g., Aortic dissection) and is not a feature of the inflammatory pathology of Buerger’s disease. **NEET-PG High-Yield Pearls:** * **Patient Profile:** Young male smokers (<45 years). * **Clinical Triad:** Claudication (often involving the arch of the foot), Raynaud’s phenomenon, and Migratory Superficial Thrombophlebitis. * **Pathology:** Characterized by a **highly cellular "inflammatory thrombus"** with relative sparing of the blood vessel wall. * **Management:** Absolute **smoking cessation** is the only way to halt disease progression and prevent amputation. Sympathectomy may be used for symptomatic relief.

Q: What is the most common cause of pseudoaneurysm?

Trauma. ### Explanation A **pseudoaneurysm** (false aneurysm) occurs when there is a breach in the arterial wall, leading to blood leaking out and being contained by the surrounding fibrous tissue or adventitia, rather than all three layers of the arterial wall (intima, media, and adventitia). **Why Trauma is the Correct Answer:** Trauma is the most common cause of pseudoaneurysms. This includes both **accidental trauma** (penetrating injuries like stabbings or gunshots) and, increasingly, **iatrogenic trauma**. In modern clinical practice, iatrogenic injury during percutaneous arterial procedures (e.g., femoral artery catheterization for coronary angiography) is the single most frequent specific cause of pseudoaneurysms. **Analysis of Incorrect Options:** * **Intravenous drug abuse (IVDA):** While a significant cause of "infected" or mycotic pseudoaneurysms (due to repeated needle trauma and local infection), it is less common than general traumatic or iatrogenic causes in the overall population. * **Congenital anomaly:** These typically lead to "true" aneurysms (involving all three layers), such as Berry aneurysms in the Circle of Willis, rather than pseudoaneurysms. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** Characterized by a **pulsatile mass** with a **systolic bruit**. * **Diagnosis:** The investigation of choice is **Duplex Ultrasonography**, which shows the classic **"Yin-Yang sign"** (turbulent blood flow within the sac). * **Management:** Small iatrogenic pseudoaneurysms may resolve spontaneously. Active management includes **Ultrasound-guided Thrombin Injection (UGTI)**—the current gold standard—or surgical repair if the patient is unstable or the neck is wide. * **Distinction:** Unlike true aneurysms, pseudoaneurysms have a high risk of rupture because they lack a true structural wall.

Q: In traumatic transection of the femoral artery and vein, which among the following should be done?

Repair of artery and vein. In vascular trauma involving both the artery and the vein, the modern surgical principle is to **repair both vessels** whenever hemodynamically feasible. ### Why Option B is Correct Restoring arterial flow is critical to prevent limb ischemia and gangrene. However, repairing the concomitant venous injury is equally vital. If the femoral vein is ligated, the resulting venous hypertension leads to massive limb edema, which increases compartmental pressure. This can compromise the newly repaired arterial graft (venous outflow obstruction leads to arterial inflow failure) and significantly increases the risk of **Compartment Syndrome**. ### Why Other Options are Incorrect * **Option A:** Ligation of the femoral vein was common in wartime (e.g., WWII), but it leads to chronic venous insufficiency and high rates of secondary amputation due to swelling and compartment syndrome. * **Option C:** Ligation of the femoral artery is contraindicated as it leads to a very high risk of limb loss (approximately 80% amputation rate for common femoral injuries). * **Option D:** Amputation is a "last resort" procedure, reserved only for unsalvageable limbs with extensive tissue necrosis or life-threatening sepsis. ### High-Yield Clinical Pearls for NEET-PG * **Sequence of Repair:** In a mangled extremity, the sequence is typically: **Bone (Stabilization/Shunt) → Vein → Artery → Nerve**. However, if ischemia time is high, a temporary vascular shunt is placed first. * **Conduit of Choice:** The **Autologous Great Saphenous Vein (GSV)** from the contralateral limb is the gold standard for arterial repair. * **Hard Signs of Vascular Injury:** Pulsatile bleeding, expanding hematoma, thrill/bruit, and the 5 P’s (Pulselessness, Pallor, Paresthesia, Pain, Paralysis). Presence of hard signs warrants immediate surgical exploration.

Q: Which of the following spinal nerve roots is spared in lumbar sympathectomy?

L1. The lumbar sympathetic chain consists of ganglia and intervening cords located on the anterolateral aspect of the lumbar vertebrae. In a lumbar sympathectomy, the goal is to denervate the lower limbs to improve blood flow (vasodilation) or manage chronic pain. Why L1 is spared: The L1 sympathetic ganglion is intentionally spared during a bilateral lumbar sympathectomy to prevent ejaculatory dysfunction (retrograde ejaculation) in males. The L1 ganglion provides sympathetic innervation to the internal urethral sphincter; its preservation ensures the sphincter closes during ejaculation, directing semen through the urethra rather than into the bladder. Additionally, the preganglionic sympathetic outflow for the lower limb typically begins from T11 to L2, but the surgical target for lower limb ischemia is usually the L2-L4 chain. Analysis of Incorrect Options: * L2 & L3: These ganglia are the primary targets for excision. They provide the majority of the sympathetic supply to the vessels of the lower limb. Removing them effectively reduces vasomotor tone. * L4: This is also frequently removed or disconnected. The standard surgical procedure involves the removal of the L2, L3, and L4 sympathetic ganglia to ensure complete sympathetic denervation of the leg and foot. Clinical Pearls for NEET-PG: * Anatomical Landmark: The lumbar sympathetic chain lies in the retroperitoneal space, along the medial border of the Psoas major muscle. * Right vs. Left: The right chain is covered by the Inferior Vena Cava (IVC), while the left chain is lateral to the Abdominal Aorta. * Key Indication: Buerger’s disease (Thromboangiitis obliterans) and peripheral arterial disease (PAD) with rest pain. * High-Yield Fact: The most common complication of bilateral L1 resection is failure of ejaculation, not impotence (which is parasympathetic/S2-S4 mediated).

Q: What is the primary cause of varicose veins?

Incompetent valve perforators. **Explanation:** Varicose veins are dilated, tortuous, and elongated superficial veins, most commonly occurring in the lower limbs. **Why Option A is Correct:** The physiological movement of blood in the lower limbs depends on the flow from the superficial system to the deep system via **perforating veins**. These perforators contain valves that prevent backflow. The **primary cause** (pathophysiology) of varicose veins is **valvular incompetence** at the saphenofemoral junction, saphenopopliteal junction, or within the perforators themselves. When these valves fail, high-pressure blood from the deep venous system leaks into the low-pressure superficial system (venous reflux), leading to dilation and varicosity. **Analysis of Incorrect Options:** * **Option B & D:** While intrinsic structural abnormalities and changes in the collagen/elastin ratio (Type III vs. Type I collagen) are observed in the vein walls of affected patients, these are generally considered **contributory factors** or secondary changes rather than the primary mechanical trigger for the disease. * **Option C:** **Venous hypertension** is the *result* of valvular incompetence and the *mechanism* by which skin changes (like lipodermatosclerosis) occur, but it is not the primary cause of the varicosities themselves. **Clinical Pearls for NEET-PG:** * **Trendelenburg Test:** Used to differentiate between saphenofemoral incompetence and perforator incompetence. * **Perthes Test:** Used to assess the patency of the **deep venous system** (crucial before surgery). * **Gold Standard Investigation:** Duplex Ultrasound (Color Doppler) is the investigation of choice. * **CEAP Classification:** Used for clinical grading (C0 to C6), where C2 represents varicose veins and C6 represents active venous ulcers.

Question 1

Lymphovenous anastomosis is done for:

Accepted Answer

Filarial lymphedema

Answer

Ascites

Answer

Varicose veins

Answer

Leprosy

Question 2

Buerger's disease is primarily caused by:

Accepted Answer

Cigarette smoking

Answer

Asbestosis

Answer

Alcohol consumption

Answer

Drug abuse

Question 3

A 67-year-old man with an 18-year history of type 2 diabetes mellitus presents for a routine physical examination. His temperature is 98.5 F, his blood pressure is 158/98 mm Hg and his pulse is 82/minute and regular. On examination, the physician notes a non-tender, pulsatile, mass in the mid-abdomen. A plain abdominal x-ray film with the patient in the lateral position reveals spotty calcification of a markedly dilated aortic wall. The patient is taken to surgery and the abdominal aorta and proximal common iliac arteries are replaced with a graft. Which of the following aneurysm diameters is usually considered the threshold above which elective surgery is recommended, unless contraindicated by other disease?

Accepted Answer

6 cm

Answer

1 cm

Answer

2 cm

Answer

10 cm

Question 4

Following aortic reconstruction, the viability of the sigmoid colon can most reliably be evaluated by?

Accepted Answer

Postoperative sigmoidoscopy

Answer

Intraoperative measurement of inferior mesenteric artery stump pressure

Answer

Intraoperative Doppler arterial signal in the sigmoid mesentery

Answer

Intraoperative observation of bowel peristalsis

Question 5

What is the most common cause of acute superior mesenteric arterial obstruction?

Accepted Answer

Embolism

Answer

Thrombosis

Answer

Non-occlusive ischemia

Answer

Atherosclerosis

Question 6

What is the characteristic angiographic finding in Buerger's disease?

Accepted Answer

Corkscrew arteries

Answer

Beaded arteries

Answer

Stenosed arteries

Answer

Arterial dissection

Question 7

What is the most common cause of pseudoaneurysm?

Accepted Answer

Trauma

Answer

Intravenous drug abuse

Answer

Congenital anomaly

Answer

None of the above

Question 8

In traumatic transection of the femoral artery and vein, which among the following should be done?

Accepted Answer

Repair of artery and vein

Answer

Femoral artery repair with vein ligation

Answer

Ligation of femoral artery

Answer

Below knee amputation

Question 9

Which of the following spinal nerve roots is spared in lumbar sympathectomy?

Accepted Answer

L1

Answer

L2

Answer

L3

Answer

L4

Question 10

What is the primary cause of varicose veins?

Accepted Answer

Incompetent valve perforators

Answer

Intrinsic abnormality of the venous wall

Answer

Venous hypertension

Answer

Decrease in collagen in the venous wall

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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