Vascular Surgery Practice Questions

Q: Varicose vein surgery is contraindicated in which of the following conditions?

Deep vein thrombosis. **Explanation:** The primary contraindication for varicose vein surgery is **Deep Vein Thrombosis (DVT)**. In patients with DVT, the deep venous system is obstructed or incompetent. Consequently, the superficial venous system (Great and Short Saphenous veins) acts as the **essential collateral pathway** for venous return from the lower limb. If these superficial veins are surgically removed or ablated, venous outflow is severely compromised, leading to acute venous congestion, severe edema, and potential phlegmasia cerulea dolens. Before any surgery, a **Perthes’ Test** or Duplex Scan must be performed to ensure the patency of the deep veins. **Analysis of Incorrect Options:** * **Varicose Ulcers (A) & Pigmentation (C):** These are features of Chronic Venous Insufficiency (CEAP classes C4 and C6). Rather than being contraindications, they are actually **strong indications** for surgery to reduce venous hypertension and promote healing. * **Hemorrhoids (D):** While both involve dilated veins, they occur in different anatomical sites (rectal vs. lower limb). The presence of hemorrhoids has no bearing on the surgical management of lower limb varicosities. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications:** Active DVT, pregnancy (due to hormonal changes and pelvic pressure), and severe peripheral arterial disease (ABI < 0.5). * **Gold Standard Investigation:** Duplex Ultrasound (to assess reflux and deep system patency). * **Trendelenburg Test:** Used to differentiate between saphenofemoral incompetence and perforator incompetence. * **Brodie-Trendelenburg Formula:** "Singly positive" means SFJ incompetence only; "Doubly positive" means both SFJ and perforator incompetence.

Q: A 45-year-old man presents with progressive cervical lymph node enlargement for the past 3 months. Which is the most diagnostic investigation?

Lymph node biopsy. **Explanation:** In the evaluation of persistent cervical lymphadenopathy (lasting >3 weeks), the primary goal is to differentiate between reactive, infectious (e.g., Tuberculosis), and neoplastic (e.g., Lymphoma or Metastasis) etiologies. **Why Lymph Node Biopsy is the Correct Answer:** Excisional biopsy is considered the **Gold Standard** and the most diagnostic investigation. Unlike cytology, a biopsy preserves the **node architecture**, which is critical for diagnosing lymphomas (distinguishing Hodgkin’s vs. Non-Hodgkin’s) and performing Immunohistochemistry (IHC). It provides a larger tissue sample, ensuring higher sensitivity and specificity for definitive diagnosis. **Analysis of Incorrect Options:** * **Fine Needle Aspiration Cytology (FNAC):** While FNAC is often the *initial* investigation of choice due to its speed and low cost, it is not the most diagnostic. It only provides cellular detail (cytology) and cannot evaluate the tissue architecture. It has a high false-negative rate in lymphomas. * **X-ray of Soft Tissues:** This is a non-specific imaging modality. While it may show calcifications (suggestive of healed TB) or soft tissue shadows, it cannot provide a pathological diagnosis. * **None of the above:** Incorrect, as biopsy is the definitive diagnostic tool. **NEET-PG High-Yield Pearls:** * **Initial Investigation:** FNAC is usually done first. * **Gold Standard/Definitive Investigation:** Excisional Biopsy. * **Biopsy Technique:** Excisional biopsy (removing the whole node) is preferred over incisional biopsy to prevent sampling errors and tumor seeding. * **Most common cause of chronic cervical lymphadenopathy in India:** Tuberculosis. * **Supraclavicular nodes (Virchow’s node):** Always pathological; usually indicates an underlying malignancy (e.g., Gastric Cancer).

Q: Atrial myxoma commonly arises from?

Left atrium. **Explanation:** Atrial myxoma is the most common primary cardiac tumor in adults. It is a benign, mesenchymal tumor that typically presents with the "classic triad" of constitutional symptoms (fever, weight loss), embolic phenomena, and obstructive symptoms mimicking mitral stenosis. **Why the Left Atrium is Correct:** Approximately **75-80% of cardiac myxomas arise in the left atrium**. They most commonly originate from the **interatrial septum**, specifically at the border of the **fossa ovalis**. Their location allows them to frequently prolapse through the mitral valve during diastole, causing a characteristic "tumor plop" sound on auscultation. **Why the Other Options are Incorrect:** * **Right Atrium (Option D):** This is the second most common site, accounting for about 15-20% of cases. While significant, it is far less frequent than left atrial involvement. * **Ventricles (Options A & C):** Ventricular myxomas are rare, representing less than 5% of all cases. Primary tumors in the ventricles are more likely to be rhabdomyomas (especially in children) or fibromas. **High-Yield Clinical Pearls for NEET-PG:** * **Carney Complex:** An autosomal dominant syndrome (PRKAR1A gene mutation) characterized by atrial myxomas, spotty skin pigmentation (lentigines), and endocrine overactivity. * **Diagnosis:** Transthoracic Echocardiography (TTE) is the initial screening tool of choice; Transesophageal Echocardiography (TEE) provides better detail. * **Treatment:** Prompt surgical excision is the treatment of choice due to the high risk of systemic embolization or sudden cardiac death. * **Histology:** Features "myxoma cells" (stellate or spindle-shaped) embedded in a glycosaminoglycan-rich stroma.

Q: What is the maximum recommended tourniquet time for the upper limb?

120 minutes. ### Explanation The use of a pneumatic tourniquet is a standard procedure in orthopedic and vascular surgeries to create a bloodless surgical field. The correct answer is **120 minutes (2 hours)**. **1. Why 120 minutes is correct:** The primary concern with tourniquet use is ischemia-reperfusion injury and nerve compression. Research indicates that skeletal muscle can tolerate up to 2 hours of ischemia without significant permanent damage. Beyond this "golden period," the risk of metabolic acidosis, rhabdomyolysis, and permanent nerve palsy (tourniquet paralysis) increases significantly. If the surgery exceeds this duration, a "breathing period" (deflation for 10–20 minutes) is required to allow for tissue reperfusion and washout of metabolic waste before re-inflation. **2. Why the other options are incorrect:** * **30 & 60 minutes:** These durations are well within the safety margin. While safe, they do not represent the *maximum* recommended threshold for the upper limb. * **90 minutes:** While some surgeons prefer a 90-minute limit for the upper limb to be extra cautious, the standard consensus in major surgical textbooks (like Sabiston or Bailey & Love) and orthopedic guidelines (Campbell’s) defines the safe upper limit as 120 minutes. **3. Clinical Pearls for NEET-PG:** * **Pressure Settings:** For the upper limb, the cuff should be inflated to **50–100 mmHg above the systolic blood pressure**. (Lower limb requires higher pressure: 100–150 mmHg above systolic). * **Nerve Vulnerability:** The **Radial nerve** is the most common nerve injured by tourniquet compression in the upper limb. * **Post-Tourniquet Syndrome:** Characterized by edema, pallor, and stiffness after deflation; it is usually related to the duration of ischemia rather than the pressure applied. * **Contraindications:** Avoid in patients with Sickle Cell Anemia (risk of crisis) or severe peripheral vascular disease.

Q: Pressure on an artery proximal to a fistula leading to diminished swelling is known as which sign?

Branham sign. ### Explanation **Branham’s Sign (also known as Nicoladoni-Branham sign)** is a classic clinical finding in patients with a large, chronic **Arteriovenous (AV) Fistula**. When digital pressure is applied to the artery proximal to the fistula, the shunting of blood from the high-pressure arterial system to the low-pressure venous system is suddenly halted. This leads to: 1. **Diminished swelling and thrill** over the fistula site. 2. **Reflex Bradycardia** (slowing of the heart rate) and a rise in systemic blood pressure. * **Mechanism:** Closing the shunt increases total peripheral resistance and effective circulating volume, stimulating baroreceptors which trigger a vagal response to slow the heart rate. #### Analysis of Incorrect Options: * **A. Murray Sign:** This is not a standard vascular sign. It is sometimes associated with the "Murray’s Law" regarding vessel branching but has no clinical relevance to AV fistula compression. * **B. Frei Sign:** This is not a recognized vascular sign. (Note: *Frey's Syndrome* refers to gustatory sweating after parotid surgery). * **C. Darrier Sign:** This is a **dermatological sign** where rubbing a lesion (mastocytoma) leads to localized urticaria/wheal formation due to histamine release from mast cells. #### High-Yield Clinical Pearls for NEET-PG: * **Machinery Murmur:** AV fistulas are characterized by a continuous "bruit" or machinery-like murmur heard throughout systole and diastole. * **Proximal vs. Distal:** Proximal to the fistula, the artery dilates (due to increased flow); distal to the fistula, there may be signs of ischemia (Steal Syndrome). * **Complication:** Large AV fistulas can lead to **High-Output Cardiac Failure** due to the persistent decrease in systemic vascular resistance.

Q: What is the most common cause of abdominal aortic aneurysm?

Atherosclerosis. **Explanation:** An **Abdominal Aortic Aneurysm (AAA)** is defined as a permanent pathological dilation of the abdominal aorta with a diameter >3 cm or >50% of its normal size. **Why Atherosclerosis is the Correct Answer:** Atherosclerosis is the most common underlying etiology for AAA. The process involves the formation of atherosclerotic plaques which lead to chronic inflammation and the recruitment of macrophages. These cells release **Matrix Metalloproteinases (MMPs)**, specifically MMP-2 and MMP-9, which degrade elastin and collagen in the tunica media. This weakens the aortic wall, causing it to bulge under arterial pressure. **Analysis of Incorrect Options:** * **Trauma:** While trauma can cause "pseudoaneurysms" or acute aortic dissections, it is a rare cause of true chronic abdominal aneurysms. * **Vasculitis:** Conditions like Takayasu arteritis or Giant Cell Arteritis can affect the aorta, but they more commonly involve the aortic arch and its branches rather than the infrarenal abdominal aorta. * **Syphilis:** Tertiary syphilis (endarteritis obliterans of vasa vasorum) classically causes aneurysms of the **ascending thoracic aorta**, not the abdominal aorta. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Most AAAs are **infrarenal** (90%), located between the renal arteries and the aortic bifurcation. * **Risk Factors:** Smoking is the strongest modifiable risk factor; others include male gender, age >65, and family history. * **Screening:** USG is the investigation of choice for screening; CT Angiography is the gold standard for surgical planning. * **Surgical Threshold:** Repair is generally indicated if the diameter is **>5.5 cm in men** or **>5.0 cm in women**, or if it grows >0.5 cm in 6 months.

Q: Dacron is a type of graft. What is its classification?

Textile synthetic. **Explanation:** Vascular grafts are categorized based on their material (synthetic vs. biologic) and their construction method (textile vs. nontextile). **1. Why "Textile Synthetic" is correct:** **Dacron** is the brand name for **polyethylene terephthalate (PET)**, a synthetic polyester. It is classified as a **textile** graft because it is constructed by interlacing yarns through either **knitting or weaving**. * **Knitted Dacron:** More flexible and porous; requires "pre-clotting" to prevent blood leakage through the interstices (though modern versions are often collagen-coated). * **Woven Dacron:** Stronger with smaller pores; used primarily for high-pressure areas like the thoracic aorta as it does not require pre-clotting. **2. Why other options are incorrect:** * **Nontextile synthetic:** This refers to **ePTFE (Expanded Polytetrafluoroethylene)**, commonly known as Gore-Tex. Unlike Dacron, ePTFE is manufactured by stretching a solid sheet of polymer to create a microporous structure, not by weaving fibers. * **Biologic grafts (Textile/Nontextile):** These are derived from living tissues. Examples include **Autografts** (Great Saphenous Vein), **Allografts** (cadaveric veins), or **Xenografts** (bovine pericardium). These are naturally occurring structures, not manufactured textiles. **High-Yield Clinical Pearls for NEET-PG:** * **Dacron** is the gold standard for **large-vessel** reconstruction (e.g., Aortic Aneurysms). * **ePTFE** is preferred for **smaller-diameter** peripheral bypasses when a suitable vein is unavailable. * **Infection Risk:** Synthetic grafts are highly susceptible to infection; in an infected field, autologous vein grafts are the preferred choice. * **Porosity:** Knitted grafts have higher porosity, promoting better "neointima" formation compared to woven grafts.

Question 1

Varicose vein surgery is contraindicated in which of the following conditions?

Accepted Answer

Deep vein thrombosis

Answer

Varicose ulcers

Answer

Pigmentation over the limb

Answer

Hemorrhoids

Question 2

A 45-year-old man presents with progressive cervical lymph node enlargement for the past 3 months. Which is the most diagnostic investigation?

Accepted Answer

Lymph node biopsy

Answer

X-ray of soft tissues

Answer

Fine Needle Aspiration Cytology (FNAC)

Answer

None of the above

Question 3

Atrial myxoma commonly arises from?

Accepted Answer

Left atrium

Answer

Left ventricle

Answer

Right ventricle

Answer

Right atrium

Question 4

What is the maximum recommended tourniquet time for the upper limb?

Accepted Answer

120 minutes

Answer

30 minutes

Answer

60 minutes

Answer

90 minutes

Question 5

Pressure on an artery proximal to a fistula leading to diminished swelling is known as which sign?

Accepted Answer

Branham sign

Answer

Murray sign

Answer

Frei sign

Answer

Darrier sign

Question 6

In the immediate post-operative period, an increase in D-dimer levels is most commonly noticed due to which of the following?

Accepted Answer

Deep vein thrombosis

Answer

Pulmonary embolism

Answer

Disseminated intravascular coagulation

Answer

Normal physiological response

Question 7

Injection sclerotherapy for varicose veins uses which agent?

Accepted Answer

Phenol

Answer

Absolute alcohol

Answer

70% alcohol

Answer

All of the above

Question 8

What is the most common cause of abdominal aortic aneurysm?

Accepted Answer

Atherosclerosis

Answer

Trauma

Answer

Vasculitis

Answer

Syphilis

Question 9

Lumbar sympathectomy is indicated in:

Accepted Answer

Raynaud's disease

Answer

Intermittent claudication

Answer

Thromboangiitis obliterans (TAO) with skin changes

Answer

Buerger's disease

Question 10

Dacron is a type of graft. What is its classification?

Accepted Answer

Textile synthetic

Answer

Nontextile synthetic

Answer

Nontextile biologic

Answer

Textile biologic

Vascular Surgery — MCQs

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