Vascular Surgery Practice Questions

Q: Which of the following statements is NOT true regarding thoracic outlet syndrome?

The radial nerve is commonly affected.. Thoracic Outlet Syndrome (TOS) involves the compression of neurovascular structures as they pass through the superior thoracic aperture. **Why Option A is the Correct Answer (The False Statement):** In neurogenic TOS, the **lower trunk of the brachial plexus (C8-T1)** is the structure most frequently compressed. This primarily affects the **ulnar nerve** distribution, leading to wasting of the intrinsic muscles of the hand (Gilliatt-Sumner hand) and numbness in the medial forearm/hand. The radial nerve (derived from C5-T1, but primarily associated with the posterior cord) is rarely involved in isolation. **Analysis of Other Options:** * **Option B:** Neurological features are indeed the most common presentation (95% of cases), characterized by pain, paresthesia, and weakness. Venous (Paget-Schroetter syndrome) and arterial involvements are much rarer. * **Option C:** Resection of the first rib (often via a transaxillary approach) is the definitive surgical treatment. It decompresses the space between the clavicle and the first rib, relieving pressure on the plexus and vessels. * **Option D:** Adson’s test is a classic clinical maneuver where the patient’s arm is abducted and the head is turned toward the affected side while taking a deep breath. A disappearance or weakening of the radial pulse suggests compression, supporting the diagnosis. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Cervical rib (found in <1% of the population, but a frequent culprit in TOS). * **Scalene Triangle:** The most common site of compression (between the anterior and middle scalene muscles). * **Differential Diagnosis:** Must be distinguished from Pancoast tumor or Carpal Tunnel Syndrome. * **Imaging:** Chest X-ray is the initial investigation to look for a cervical rib or elongated C7 transverse process.

Q: Which of the following is NOT an indication for sympathectomy?

Intermittent claudication. ### Explanation **Concept Overview:** Lumbar sympathectomy involves the destruction of the sympathetic chain (L2-L4) to eliminate vasoconstrictor tone. This results in **vasodilation of the skin vessels** rather than the muscle vessels. **Why Intermittent Claudication is NOT an indication:** Intermittent claudication is pain caused by ischemia in the **skeletal muscles** during exercise. Sympathectomy primarily increases blood flow to the **skin and subcutaneous tissues**, not the deep muscles. In fact, sympathectomy can theoretically worsen claudication via a "steal phenomenon," where blood is diverted away from the ischemic muscle toward the dilated cutaneous vascular bed. Therefore, it is ineffective and contraindicated for claudication. **Analysis of Other Options:** * **Ischemic Pain & Rest Pain:** These represent advanced peripheral arterial disease (Critical Limb Ischemia). Sympathectomy helps by increasing cutaneous collateral circulation, which can alleviate rest pain and promote the healing of small ischemic ulcers. * **Buerger’s Disease (Thromboangiitis Obliterans):** This is the **most common indication** for sympathectomy. Since it primarily affects distal small and medium-sized arteries, sympathectomy helps reduce vasospasm and improve distal skin perfusion, providing symptomatic relief. **High-Yield Clinical Pearls for NEET-PG:** * **Primary Effect:** Increases skin blood flow; has no effect on muscle blood flow. * **Ideal Candidate:** A patient with distal arterial occlusion (e.g., Buerger's) where reconstructive surgery is not possible. * **Level of Block:** For the lower limb, the **L2, L3, and L4** ganglia are targeted. L1 is preserved in males to prevent loss of ejaculation. * **Success Predictor:** A positive response to a temporary chemical sympathetic block (using Phenol or Alcohol) suggests a good surgical outcome.

Q: All statements are true about Paget-Schroetter syndrome except?

Associated with jugular-subclavian venous thrombosis. **Explanation:** **Paget-Schroetter Syndrome (PSS)**, also known as **"Effort Thrombosis,"** is a specific type of primary upper extremity deep vein thrombosis (UEDVT). **Why Option B is the Correct Answer (The False Statement):** While PSS involves the **subclavian and axillary veins**, it is specifically characterized by thrombosis at the level of the **costoclavicular space** (between the first rib and the clavicle). It is **not** typically associated with jugular vein involvement. The term "jugular-subclavian venous thrombosis" is more characteristic of secondary causes, such as central venous catheterization or malignancy (Trousseau’s syndrome), rather than the mechanical "effort-induced" etiology of PSS. **Analysis of Other Options:** * **Option A:** PSS is indeed the vascular manifestation of **Venous Thoracic Outlet Syndrome (vTOS)**, where the vein is compressed by anatomical structures (first rib, clavicle, or scalene muscles). * **Option C:** It typically occurs in young, healthy athletes (e.g., swimmers, pitchers, weightlifters) following **vigorous or repetitive overhead activities** that lead to microtrauma of the vessel wall. * **Option D:** Repetitive compression results in **intimal damage** to the subclavian vein, triggering the coagulation cascade and subsequent thrombus formation. **NEET-PG High-Yield Pearls:** * **Clinical Presentation:** Sudden onset of "blue-arm" (cyanosis), swelling, and prominent collateral veins over the shoulder (Urschel’s sign). * **Diagnosis:** Duplex Ultrasound is the initial investigation; **Catheter-directed Venography** is the gold standard. * **Treatment Triad:** 1. Catheter-directed thrombolysis, 2. Anticoagulation, and 3. **Surgical decompression** (First rib resection) to prevent recurrence.

Q: Which of the following statements is NOT true regarding Buerger's disease?

Cigarette cessation is the definitive treatment.. **Explanation:** Buerger’s disease, also known as **Thromboangiitis Obliterans (TAO)**, is a non-atherosclerotic, segmental, inflammatory disease that most commonly affects small and medium-sized arteries and veins of the extremities. **Why Option C is the correct answer (The "Not True" statement):** While smoking cessation is the **most critical step** and the only way to halt the progression of the disease, it is technically not a "definitive treatment" in the surgical sense. Once critical limb ischemia or gangrene has set in, smoking cessation alone cannot reverse the established vascular damage or tissue loss. There is no definitive "cure" or surgical gold standard; management is supportive and focused on prevention. **Analysis of Incorrect Options:** * **Option A:** True. Buerger’s disease characteristically involves the distal arteries of the **lower extremities** (e.g., tibial and dorsalis pedis) and the upper extremities. * **Option B:** True. **Migratory superficial thrombophlebitis** is a hallmark clinical feature, occurring in approximately 40-50% of patients. * **Option C:** True. The disease typically affects **young male smokers**, usually presenting before the age of 40-45, with many cases starting **below 30 years of age**. **NEET-PG High-Yield Pearls:** * **Angiographic Finding:** Classic **"Corkscrew collaterals"** (Martorell’s sign) are seen due to the occlusion of distal vessels. * **Pathology:** Unlike atherosclerosis, the **Internal Elastic Lamina is preserved**. A highly characteristic feature is the "microabscess" within the thrombus. * **Allen’s Test:** Often positive, indicating involvement of the radial or ulnar arteries. * **Treatment:** Absolute cessation of tobacco (including smokeless tobacco and nicotine replacements) is mandatory. Sympathectomy may be used for pain relief, but revascularization is rarely possible due to the distal nature of the disease.

Q: Obstruction at the bifurcation of the aorta leads to which of the following?

Gangrene of the foot. ### Explanation **Concept:** Obstruction at the bifurcation of the aorta is most commonly associated with **Leriche Syndrome** (Aortoiliac Occlusive Disease). This condition is characterized by a triad of: 1. **Intermittent claudication** of the buttocks and thighs. 2. **Erectile dysfunction** (impotence) due to decreased blood flow to the internal iliac arteries. 3. **Absent or diminished femoral pulses.** **Why Gangrene of the Foot is the Correct Answer:** Chronic, high-grade obstruction at the aortic bifurcation leads to **Critical Limb Ischemia (CLI)**. When collateral circulation fails to compensate for the lack of distal perfusion, it results in rest pain, non-healing ulcers, and eventually **gangrene of the foot**. While other symptoms occur, gangrene is a definitive clinical consequence of the severe, end-stage ischemia caused by such a proximal obstruction. **Analysis of Incorrect Options:** * **A & D (Rubor and Pallor):** These are signs of peripheral vascular disease (Buerger’s test), but they are transient postural changes rather than the definitive "end-result" of a major bifurcation obstruction. * **B (Retrograde Ejaculation):** This is typically a complication of **aortic surgery** (due to damage to the superior hypogastric plexus) or diabetes, rather than the obstructive process itself. The obstruction causes *impotence* (failure of erection), not retrograde ejaculation. **High-Yield Clinical Pearls for NEET-PG:** * **Leriche Syndrome Triad:** Claudication + Impotence + Absent Femoral Pulses. * **Most common site of atherosclerotic occlusion:** Superficial Femoral Artery (within the Adductor/Hunter’s canal). * **Investigation of Choice:** Digital Subtraction Angiography (DSA) is the gold standard, but CT Angiography is the initial diagnostic modality. * **Management:** Aortobifemoral bypass is the classic surgical treatment for extensive aortoiliac disease.

Q: Which of the following agents is NOT used for sclerotherapy in varicose veins?

Mannitol. **Explanation:** Sclerotherapy is a minimally invasive procedure used to treat varicose veins and telangiectasias. It involves injecting a **sclerosant** agent into the vein, which causes endothelial damage, localized thrombosis, and eventual fibrosis (obliteration) of the vessel. **Why Mannitol is the Correct Answer:** **Mannitol** is an osmotic diuretic used to reduce intracranial pressure or intraocular pressure. It does not possess the detergent or chemical properties required to induce endothelial injury and venous fibrosis. Therefore, it has no role in sclerotherapy. **Analysis of Incorrect Options (Common Sclerosants):** * **Sodium Tetradecyl Sulfate (STS):** A detergent-based sclerosant and the most commonly used agent. it works by macerating the vascular endothelium. * **Polidocanol:** A non-ionic detergent sclerosant. It is popular because it has a lower risk of skin necrosis if extravasated and possesses local anesthetic properties, making the injection less painful. * **Ethanolamine Oleate:** A synthetic fatty acid often used for sclerotherapy of esophageal varices and occasionally for peripheral varicose veins. **High-Yield Clinical Pearls for NEET-PG:** 1. **Mechanism:** Sclerosants are classified into **Detergents** (STS, Polidocanol), **Osmotic agents** (Hypertonic saline), and **Chemical irritants** (Chromated glycerin). 2. **Complications:** The most common side effects include hyperpigmentation (hemosiderin staining), superficial thrombophlebitis, and rarely, deep vein thrombosis (DVT) or tissue necrosis. 3. **Foam Sclerotherapy (Tessari Technique):** Mixing the sclerosant with air to create a foam increases the surface area of contact with the endothelium, allowing for lower concentrations to be used effectively. 4. **Contraindications:** Pregnancy, acute DVT, and severe systemic illness.

Q: The Hunterian Ligature operation is performed for what condition?

Aneurysm. **Explanation:** The **Hunterian Ligature** (proximal ligation) is a classic surgical technique historically used for the treatment of **aneurysms**, specifically popliteal aneurysms. **1. Why Aneurysm is correct:** Introduced by John Hunter in 1785, the procedure involves ligating the artery (the superficial femoral artery in the adductor/Hunter’s canal) at a site **proximal** to the aneurysm. The physiological principle is to reduce the high-pressure pulsatile flow into the aneurysmal sac without completely cutting off circulation. This encourages gradual thrombosis of the aneurysm while allowing collateral circulation to maintain limb viability, thereby preventing the high risk of gangrene associated with ligation immediately above the sac (Anel’s ligation). **2. Why other options are incorrect:** * **Varicose veins:** These are treated with Trendelenburg ligation (juxtafemoral ligation) or stripping, not Hunterian ligation. * **Arteriovenous fistulas:** These require excision or repair of the communication (e.g., Nicoladoni-Branham sign assessment), as proximal ligation alone can worsen ischemia via "steal phenomenon." * **Acute arterial ischemia:** This is an emergency requiring embolectomy (Fogarty catheter) or thrombolysis; ligation would worsen the ischemia. **3. High-Yield Clinical Pearls for NEET-PG:** * **Hunter’s Canal (Adductor Canal):** Located in the middle third of the thigh; contains the femoral artery, femoral vein, and saphenous nerve. * **Evolution of Aneurysm Surgery:** * *Antyllus:* Proximal and distal ligation with evacuation. * *Anel’s:* Ligation immediately proximal to the sac. * *Hunter’s:* Ligation well proximal to the sac (in healthy tissue). * *Matas (Endoaneurysmorrhaphy):* Internal repair of the sac. * **Modern Standard:** Today, aneurysms are typically managed with **interposition grafts** or **endovascular stenting (EVAR)**.

Question 1

The Allen test is used for what purpose?

Accepted Answer

Radial or ulnar artery patency

Answer

Thoracic outlet syndrome

Answer

Varicose veins

Answer

Ulnar nerve injury

Question 2

Which of the following statements is NOT true regarding thoracic outlet syndrome?

Accepted Answer

The radial nerve is commonly affected.

Answer

Neurological features are most common.

Answer

Resection of the first rib relieves symptoms.

Answer

A positive Adson's test is indicative of the condition.

Question 3

Which of the following is NOT an indication for sympathectomy?

Accepted Answer

Intermittent claudication

Answer

Ischemic pain

Answer

Rest pain

Answer

Buerger disease

Question 4

All statements are true about Paget-Schroetter syndrome except?

Accepted Answer

Associated with jugular-subclavian venous thrombosis

Answer

Also known as venous thoracic outlet syndrome

Answer

History of performing prolonged activities

Answer

Results in damage to the subclavian vein

Question 5

Which of the following venous abnormalities is indicated for surgery?

Accepted Answer

Deep vein incompetence with DVT

Answer

Deep vein incompetence without DVT

Answer

Varicosity > 3 mm in diameter

Answer

Varicosity < 3 mm in diameter

Question 6

Lumbar sympathectomy can be recommended in all of the following conditions except?

Accepted Answer

Erectile dysfunction

Answer

Hyperhydrosis

Answer

Causalgia

Answer

Buerger's disease

Question 7

Which of the following statements is NOT true regarding Buerger's disease?

Accepted Answer

Cigarette cessation is the definitive treatment.

Answer

It is common in the lower extremities.

Answer

Superficial thrombophlebitis is common.

Answer

It usually affects individuals below 30 years of age.

Question 8

Obstruction at the bifurcation of the aorta leads to which of the following?

Accepted Answer

Gangrene of the foot

Answer

Rubor on putting the leg in a dependent position

Answer

Retrograde ejaculation

Answer

Pallor of the lower limb

Question 9

Which of the following agents is NOT used for sclerotherapy in varicose veins?

Accepted Answer

Mannitol

Answer

Ethanolamine oleate

Answer

Sodium tetradecyl sulfate

Answer

Polidocanol

Question 10

The Hunterian Ligature operation is performed for what condition?

Accepted Answer

Aneurysm

Answer

Varicose veins

Answer

Arteriovenous fistulas

Answer

Acute arterial ischemia

Vascular Surgery — MCQs

Vascular Surgery — MCQs

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