Vascular Surgery Practice Questions

Q: All of the following are true about lymphedema EXCEPT:

Primary lymphedema typically sets in by age of 2. **Explanation:** Lymphedema is a chronic condition characterized by the accumulation of protein-rich **interstitial fluid** due to impaired lymphatic drainage. **Why Option D is the Correct Answer (The False Statement):** Primary lymphedema is classified based on the age of onset, and it rarely sets in by age 2. The most common form is **Lymphedema Praecox**, which typically appears during puberty or adolescence (up to age 35) and accounts for 80% of primary cases. Only *Lymphedema Congenita* (e.g., Milroy’s disease) is present at birth or within the first two years of life, making the statement that it "typically" sets in by age 2 incorrect. **Analysis of Other Options:** * **Option A:** The global prevalence of lymphedema is estimated to be between **0.1% and 2%**, making it a significant clinical entity. * **Option B:** The fundamental pathophysiology involves the failure of the lymphatic system to remove high-molecular-weight proteins, leading to increased oncotic pressure and **interstitial fluid accumulation**. * **Option C:** Lymphedema severity is often graded by limb volume increase: Mild ( 40%)**. **NEET-PG High-Yield Pearls:** * **Most common cause worldwide:** Filariasis (*Wuchereria bancrofti*). * **Most common cause in developed countries:** Secondary to malignancy or its treatment (e.g., post-mastectomy axillary lymph node dissection). * **Stemmer’s Sign:** Inability to pinch the skin on the dorsal surface of the base of the second toe; a pathognomonic clinical finding. * **Stewart-Treves Syndrome:** A rare, dreaded complication where lymphangiosarcoma develops in a limb with long-standing chronic lymphedema.

Q: Thromboangiitis obliterans (Buerger's disease) primarily involves which of the following vessels?

Anterior and posterior tibial arteries. **Explanation:** **Thromboangiitis obliterans (Buerger’s disease)** is a non-atherosclerotic, segmental, inflammatory vasculitis that predominantly affects **small and medium-sized arteries and veins** of the distal upper and lower extremities. 1. **Why Option A is Correct:** Buerger’s disease characteristically involves distal vessels. The **anterior and posterior tibial arteries** (along with the radial and ulnar arteries) are the classic medium-sized vessels targeted. The disease typically starts distally and progresses proximally, leading to digital ischemia, rest pain, and gangrene. Pathologically, it features a highly cellular "tobacco-associated" thrombus with relative sparing of the vessel wall. 2. **Why Other Options are Incorrect:** * **Options B, C, and D:** The femoral, aortoiliac, and popliteal arteries are **large-sized elastic/muscular arteries**. These vessels are the primary sites for **Atherosclerosis Obliterans (ASO)**. Buerger’s disease is distinguished from ASO by its predilection for distal vessels and the absence of traditional atherosclerotic risk factors (except smoking). **High-Yield Clinical Pearls for NEET-PG:** * **Patient Profile:** Young male smokers (usually <45 years). * **Triad:** Distal arterial ischemia, Raynaud’s phenomenon, and **Migratory Superficial Thrombophlebitis**. * **Angiographic Finding:** "Corkscrew collaterals" (Martorell’s sign) due to recanalization of the thrombus. * **Diagnosis:** Allen’s test is often positive (indicating distal ulnar/radial involvement). * **Management:** Absolute **smoking cessation** is the only definitive treatment to prevent amputation. Sympathectomy may be used for symptomatic relief in vasospastic cases.

Q: Ischaemia is characterized by all except?

Thickening of skin. In chronic limb-threatening ischemia (CLTI), the fundamental pathophysiology is a **reduction in blood flow and nutrient delivery** to the distal tissues. This leads to **atrophic changes**, not hypertrophic ones. ### Why "Thickening of skin" is the correct answer: Ischemia causes the skin to become **thin, shiny, and atrophic** (parchment-like) due to the loss of dermal collagen and reduced cell turnover. Thickening of the skin (hyperkeratosis or lipodermatosclerosis) is typically a feature of **chronic venous insufficiency** or chronic lymphatic obstruction, rather than arterial ischemia. ### Analysis of Incorrect Options: * **Brittle nails:** Reduced blood supply to the nail matrix leads to trophic changes, causing the nails to become brittle, ridged, and slow-growing. (In some cases, they may appear thickened/hypertrophic due to fungal infections secondary to poor tissue health, but brittleness is a classic ischemic sign). * **Muscle wasting:** Chronic oxygen deprivation leads to myocyte atrophy and replacement of muscle fibers with fibrous tissue, clinically manifesting as a reduction in calf or thigh circumference. * **Loss of subcutaneous fat:** Ischemia leads to the depletion of the subcutaneous layer, contributing to the "skeletal" appearance of a chronically ischemic limb. ### NEET-PG High-Yield Pearls: * **Trophic Changes of Ischemia:** Remember the "4 Loses": Loss of hair, Loss of fat (subcutaneous), Loss of muscle (wasting), and Loss of skin thickness (atrophy). * **Buerger’s Test:** A positive test (pallor on elevation, rubor on dependency) is a hallmark of significant arterial ischemia. * **Critical Limb Ischemia (CLI) Definition:** Characterized by rest pain for >2 weeks, ulceration, or gangrene, corresponding to Fontaine stages III/IV or Rutherford categories 4-6.

Q: Which of the following is NOT a feature of acute arterial occlusion?

Cyanosis. In acute arterial occlusion, the hallmark clinical presentation is defined by the **"6 Ps"**: Pain, Pallor, Pulselessness, Paresthesia, Paralysis, and Poikilothermia (coldness). ### Why Cyanosis is the Correct Answer **Cyanosis** is typically a sign of venous congestion or chronic deoxygenation, not acute arterial blockage. In an acute arterial event, there is a sudden and complete cessation of blood flow to the distal limb. Because no blood (oxygenated or deoxygenated) is reaching the capillaries, the skin becomes **waxy white (Pallor)** rather than blue. Cyanosis may only appear in the very late stages of tissue death (gangrene), but it is not a primary feature of the acute occlusion phase. ### Explanation of Incorrect Options * **Pallor (Option B):** This is the earliest sign. The lack of erythrocyte inflow leads to an empty capillary bed, resulting in a characteristic "cadaveric" white appearance. * **Paralysis (Option C):** This is a late and ominous sign indicating profound muscle ischemia. It suggests that the limb is potentially non-viable and requires immediate surgical intervention. * **Paresthesia (Option D):** Nerve fibers are highly sensitive to hypoxia. "Pins and needles" sensations or loss of light touch are often the first neurological deficits to appear. ### High-Yield Clinical Pearls for NEET-PG * **The Golden Period:** Revascularization should ideally occur within **6 hours** to prevent irreversible muscle necrosis and "crush syndrome" upon reperfusion. * **Most Common Cause:** Embolism (usually originating from the heart due to Atrial Fibrillation). * **Most Common Site of Embolism:** The **Femoral artery bifurcation**. * **Muscle Sensitivity:** Nerve tissue is the most sensitive to ischemia, followed by muscle (which can survive roughly 4 hours of total ischemia). Skin and bone are the most resistant.

Q: What is the gold standard for the diagnosis of carotid body tumors?

MRI. **Explanation:** Carotid body tumors (CBTs), also known as chemodectomas or paragangliomas, are highly vascular tumors located at the carotid bifurcation. **Why MRI is the Gold Standard:** MRI is considered the gold standard for diagnosis because it provides superior soft-tissue contrast and anatomical detail. On T2-weighted images, CBTs classically exhibit a **"salt and pepper" appearance**—the "salt" represents areas of high-signal hemorrhage or slow flow, while the "pepper" represents flow voids from high-velocity tumor vessels. Magnetic Resonance Angiography (MRA) further helps in assessing the relationship of the tumor with the carotid vessels without the need for ionizing radiation or nephrotoxic contrast. **Analysis of Other Options:** * **Duplex Scanning:** Usually the initial screening tool. It shows a hypervascular mass at the bifurcation but lacks the anatomical detail required for surgical planning. * **Computed Tomography (CT):** Useful for showing a contrast-enhancing mass that splayed the internal and external carotid arteries, but it is inferior to MRI in characterizing the tumor's internal matrix. * **Cerebral Angiography:** Historically the gold standard, it is now reserved for preoperative **embolization** of large tumors. It demonstrates the classic **"Lyre Sign"** (widening of the carotid bifurcation). **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Sign:** **Fontaine’s Sign**—The tumor is mobile horizontally but fixed vertically (due to its attachment to the carotid artery). * **Classification:** **Shamblin Classification** (Groups I, II, and III) is used to predict surgical morbidity based on the degree of vessel encirclement. * **Origin:** Arises from the **Type 1 (Chief) cells** of the carotid body. * **Rule of 10s:** Approximately 10% are bilateral, 10% are familial, and 10% are malignant.

Q: For aortic grafts, what is the best available material?

Dacron. **Explanation:** The choice of material for vascular reconstruction depends primarily on the diameter of the vessel and the flow rate. For **large-diameter, high-flow vessels** like the aorta, **Dacron (knitted or woven polyester)** is the gold standard and the best available material. **1. Why Dacron is the Correct Answer:** Dacron is a synthetic polyester material favored for aortic surgery because of its excellent long-term durability and high tensile strength, which is essential to withstand the high pressures of the aorta. It acts as a scaffold that promotes **pseudointima formation** (incorporation into host tissue). Knitted Dacron is porous, allowing for better tissue ingrowth, while woven Dacron is less porous and often used in emergency ruptured aneurysms to minimize blood loss through the graft wall. **2. Why other options are incorrect:** * **Gore-Tex (ePTFE):** While widely used, it is generally preferred for **medium-sized vessels** (like the femoropopliteal artery) or as an arteriovenous shunt for dialysis. It is less compliant than Dacron for large-bore aortic reconstruction. * **Vein (Autologous):** Autologous veins (like the Great Saphenous Vein) are the "gold standard" for **small-vessel bypass** (e.g., coronary arteries or below-the-knee bypass) because they resist infection and thrombosis better. However, they are unsuitable for the aorta due to size mismatch and the risk of aneurysmal dilation under high aortic pressure. **High-Yield Clinical Pearls for NEET-PG:** * **Aorta/Large Vessels:** Dacron is the material of choice. * **Small Vessels (<6mm):** Autologous vein is the material of choice. * **Infection Resistance:** Autologous tissue (vein) is superior to all synthetic grafts in an infected field. * **Pre-clotting:** Older non-coated Dacron grafts required "pre-clotting" with the patient's blood to prevent leaking; modern grafts are often impregnated with **collagen or albumin** to eliminate this need.

Q: What is the typical sequence of color changes observed in Raynaud's disease?

White, blue, red. **Explanation:** Raynaud’s phenomenon is a vasospastic disorder characterized by episodic digital ischemia in response to cold or emotional stress. The classic sequence of color changes follows a specific pathophysiological progression: 1. **White (Pallor):** This is the initial phase caused by intense **vasoconstriction** of the digital arteries and arterioles, leading to a lack of blood flow to the capillaries. 2. **Blue (Cyanosis):** As the ischemia persists, the stagnant blood in the capillaries becomes deoxygenated, resulting in a dusky blue appearance. 3. **Red (Rubor):** Once the stimulus (cold) is removed, **reactive hyperemia** occurs. The vessels dilate, and oxygenated blood rushes back into the digits, often accompanied by pain or tingling. **Analysis of Incorrect Options:** * **Options A, C, and D** are incorrect because they do not follow the physiological order of ischemia (pallor) followed by stasis (cyanosis) and finally reperfusion (rubor). **High-Yield Clinical Pearls for NEET-PG:** * **Primary Raynaud’s (Raynaud’s Disease):** Idiopathic, usually bilateral, symmetrical, and occurs in young women without an underlying systemic disease. * **Secondary Raynaud’s (Raynaud’s Phenomenon):** Associated with connective tissue disorders, most commonly **Scleroderma** (CREST syndrome) or SLE. It is often asymmetrical and can lead to digital ulceration or gangrene. * **Diagnosis:** Primarily clinical; Nailfold capillaroscopy is used to differentiate primary from secondary causes. * **Management:** * *First-line:* Lifestyle modification (avoiding cold, smoking cessation). * *Drug of Choice:* **Calcium Channel Blockers** (e.g., Nifedipine). * *Surgical:* Cervicodorsal sympathectomy (reserved for refractory cases).

Q: A middle-aged woman presents with non-pitting edema of the right leg and foot, accompanied by dermatitis and hyperpigmentation. The diagnosis of chronic venous insufficiency is established. What is the primary treatment?

Pressure-gradient stockings. **Explanation:** The clinical presentation of non-pitting edema, dermatitis, and hyperpigmentation (lipodermatosclerosis) in a middle-aged woman is classic for **Chronic Venous Insufficiency (CVI)**. **Why Pressure-gradient Stockings are the Correct Answer:** The primary treatment for CVI is **conservative medical management**, specifically **compression therapy**. Pressure-gradient stockings (30-40 mmHg) counteract the elevated venous hydrostatic pressure. They reduce edema, improve venous return by compressing superficial veins, and enhance the efficiency of the calf muscle pump. This remains the "Gold Standard" and first-line treatment for managing symptoms and preventing the progression to venous ulcers. **Why Other Options are Incorrect:** * **Vein Stripping (A):** This is a surgical treatment for superficial varicose veins. While it may be used in CVI if superficial reflux is the primary cause, it is not the *initial* or primary treatment, especially when skin changes are present. * **Skin Grafting (C):** This is reserved for large, refractory venous ulcers that fail to heal with compression. It does not address the underlying venous hypertension. * **Perforator Vein Ligation (D):** Procedures like SEPS (Subfascial Endoscopic Perforator Surgery) are indicated only when conservative management fails and there is documented incompetent perforator flow contributing to ulceration. **Clinical Pearls for NEET-PG:** * **CEAP Classification:** Used to grade CVI (C0-C6). This patient is likely **C4** (Skin changes). * **Gaiter Zone:** The area between the mid-calf and malleolus where CVI changes (hyperpigmentation/ulcers) are most common. * **Champagne Bottle Leg:** A high-yield sign where the lower leg is narrowed due to lipodermatosclerosis while the calf remains swollen. * **Contraindication:** Always check the **Ankle-Brachial Index (ABI)** before applying compression; stockings are contraindicated if ABI < 0.5.

Q: Adson's test is used to assess vascular compression. It is useful in identifying which of the following conditions?

Cervical rib. **Explanation:** **Adson’s Test** is a clinical maneuver used to identify compression of the **subclavian artery** as it passes through the interscalene triangle. This compression is a hallmark of **Thoracic Outlet Syndrome (TOS)**, which is most commonly caused by a **Cervical Rib** or hypertrophied scalene muscles. 1. **Why Cervical Rib is correct:** A cervical rib is a supernumerary rib arising from the C7 vertebra. It narrows the space between the scalenus anterior and medius muscles. During Adson’s test, the patient’s arm is abducted, the neck is extended, and the head is rotated toward the affected side while taking a deep breath. This maneuver further tightens the scalene muscles; if a cervical rib is present, it compresses the subclavian artery, leading to a **diminution or obliteration of the radial pulse**. 2. **Why other options are incorrect:** * **Peripheral Vascular Disease (PVD):** This involves systemic atherosclerosis of the lower limbs and is assessed using the Ankle-Brachial Index (ABI) or Buerger’s test. * **Varicose Veins:** This is a venous pathology of the lower limbs, assessed using Trendelenburg’s test or the Perthes test. * **Arteriovenous (AV) Fistula:** This is an abnormal communication between an artery and a vein, typically identified by a "machinery murmur" or thrill, and assessed via Nicoladoni-Branham’s sign. **Clinical Pearls for NEET-PG:** * **Halsted’s Maneuver:** Similar to Adson’s but involves downward traction on the arm and moving the head *away* from the affected side. * **Roos Test (Elevated Arm Stress Test):** Considered the most sensitive clinical test for Thoracic Outlet Syndrome. * **Neurological TOS:** More common than vascular TOS; patients present with wasting of the small muscles of the hand (T1 distribution).

Question 1

All of the following are true about lymphedema EXCEPT:

Accepted Answer

Primary lymphedema typically sets in by age of 2

Answer

Prevalence of 0.1-2%

Answer

Interstitial fluid accumulation

Answer

Severe lymphedema if limb volume increases by more than 40%

Question 2

Thromboangiitis obliterans (Buerger's disease) primarily involves which of the following vessels?

Accepted Answer

Anterior and posterior tibial arteries

Answer

Femoral arteries

Answer

Aortoiliac arteries

Answer

Popliteal arteries

Question 3

Ischaemia is characterized by all except?

Accepted Answer

Thickening of skin

Answer

Brittle nails

Answer

Muscle wasting

Answer

Loss of subcutaneous fat

Question 4

Which of the following is NOT a feature of acute arterial occlusion?

Accepted Answer

Cyanosis

Answer

Pallor

Answer

Paralysis

Answer

Paresthesia

Question 5

The triad of revascularization injury includes all of the following except:

Accepted Answer

Gangrene

Answer

Myoglobinuria

Answer

Acute renal failure

Answer

Muscle infarction

Question 6

What is the gold standard for the diagnosis of carotid body tumors?

Accepted Answer

MRI

Answer

Duplex scanning

Answer

Computed Tomography

Answer

Cerebral angiography

Question 7

For aortic grafts, what is the best available material?

Accepted Answer

Dacron

Answer

Gore-Tex

Answer

Vein

Answer

None of the above

Question 8

What is the typical sequence of color changes observed in Raynaud's disease?

Accepted Answer

White, blue, red

Answer

Red, blue, white

Answer

Blue, red, white

Answer

White, red, blue

Question 9

A middle-aged woman presents with non-pitting edema of the right leg and foot, accompanied by dermatitis and hyperpigmentation. The diagnosis of chronic venous insufficiency is established. What is the primary treatment?

Accepted Answer

Pressure-gradient stockings

Answer

Vein stripping

Answer

Skin grafting

Answer

Perforator vein ligation

Question 10

Adson's test is used to assess vascular compression. It is useful in identifying which of the following conditions?

Accepted Answer

Cervical rib

Answer

Peripheral vascular disease

Answer

Varicose veins

Answer

Arteriovenous fistula

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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