Mesenteric Vascular Disease — MCQs
Tumour of the uncinate process of the pancreas will compress which artery
Inferior pancreaticoduodenal artery is a branch of which of the following arteries?
Gangrene of the intestine is seen in all the following conditions, except:
Identify the artery labeled as 'X' in the provided angiography anatomy image.
Which of the following is the best management for radiation induced occlusive disease of carotid artery?
In which condition is the Adson test positive?
In which one of the following is Branham's sign positive?
What is the significance of the term 'Corona mortis' in human anatomy?
Pseudoclaudication is caused by:
Which of the following statements about Alzheimer's disease is true?
Mesenteric Vascular Disease Indian Medical PG Practice Questions and MCQs
Question 1: Tumour of the uncinate process of the pancreas will compress which artery
- A. Superior mesenteric artery (Correct Answer)
- B. Inferior mesenteric artery
- C. Common hepatic artery
- D. Splenic artery
Explanation: ***Superior mesenteric artery*** - The **uncinate process** forms the lower and medial part of the head of the pancreas, hooking around and behind the **superior mesenteric vessels**. - A tumor in this region would therefore almost immediately compress the **superior mesenteric artery** and vein due to its close anatomical relationship. *Splenic artery* - The **splenic artery** runs along the superior border of the pancreas, primarily associated with the body and tail. - A tumor in the **uncinate process** (part of the head) would be anatomically distant from the splenic artery, making compression unlikely. *Inferior mesenteric artery* - The **inferior mesenteric artery** arises from the aorta much lower than the pancreas, typically at the L3 vertebral level. - Its anatomical position makes it spatially separated from the uncinate process of the pancreas, so compression is not expected. *Common hepatic artery* - The **common hepatic artery** runs anterior to the portal vein and to the left of the bile duct, supplying the liver. - It is located superior to the head of the pancreas and away from the uncinate process, hence not typically affected by tumors in that specific pancreatic region.
Question 2: Inferior pancreaticoduodenal artery is a branch of which of the following arteries?
- A. Splenic artery
- B. Left gastric artery
- C. Gastroduodenal artery
- D. Superior mesenteric artery (Correct Answer)
Explanation: ***Superior mesenteric artery*** - The **inferior pancreaticoduodenal artery** is a direct branch of the **superior mesenteric artery (SMA)**. - It supplies the **head of the pancreas** and the **duodenum**, anastomosing with branches from the gastroduodenal artery. *Splenic artery* - The splenic artery is a branch of the **celiac trunk** and primarily supplies the **spleen**, stomach, and pancreas (via pancreatic branches). - It does not give rise to the inferior pancreaticoduodenal artery. *Left gastric artery* - The left gastric artery is a branch of the **celiac trunk** and supplies the **lesser curvature of the stomach** and distal esophagus. - It has no direct connection to the inferior pancreaticoduodenal artery. *Gastroduodenal artery* - The gastroduodenal artery is a branch of the **common hepatic artery** (from the celiac trunk) and gives off the **anterior and posterior superior pancreaticoduodenal arteries**. - While it supplies the head of the pancreas and duodenum, it is not the origin of the inferior pancreaticoduodenal artery, which arises from the SMA.
Question 3: Gangrene of the intestine is seen in all the following conditions, except:
- A. Shock
- B. Mesenteric artery thrombosis
- C. Tricuspid Valve Endocarditis (Correct Answer)
- D. Volvulus
Explanation: ***Tricuspid Valve Endocarditis*** - While vegetations from **tricuspid valve endocarditis** can embolize, they typically affect the **pulmonary circulation** (e.g., pulmonary embolism, septic pulmonary infarcts) due to the venous drainage pattern. - Embolization from the right side of the heart to the systemic circulation (like the mesenteric arteries) is rare unless there's a **patent foramen ovale** or similar intracardiac shunt. - Therefore, tricuspid endocarditis does **NOT** typically cause intestinal gangrene. *Shock* - **Hypoperfusion** during shock leads to a severe reduction in blood flow to the intestines, causing **ischemia**. - Prolonged or severe ischemia can result in **intestinal gangrene** due to tissue death. - This is known as **non-occlusive mesenteric ischemia (NOMI)**. *Mesenteric artery thrombosis* - A **thrombus** in the mesenteric artery directly blocks blood supply to a segment of the intestine. - This abrupt cessation of blood flow leads rapidly to **ischemia and infarction**, resulting in gangrene. - Accounts for approximately 25-30% of acute mesenteric ischemia cases. *Volvulus* - **Volvulus** involves the twisting of a loop of intestine around its mesentery, which constricts and obstructs the mesenteric blood vessels. - This vascular compromise quickly leads to **ischemia and gangrene** of the twisted bowel segment. - Common sites include sigmoid colon and cecum.
Question 4: Identify the artery labeled as 'X' in the provided angiography anatomy image.
- A. Superior mesenteric artery (Correct Answer)
- B. Subclavian artery
- C. Celiac trunk
- D. Brachiocephalic trunk
Explanation: ***Superior mesenteric artery*** - The image displays a selective angiogram highlighting an artery branching off the **aorta** in the abdominal region and supplying multiple loops of bowel, characteristic of the superior mesenteric artery. - The location and extensive branching pattern supplying various abdominal structures confirm its identity as the **superior mesenteric artery**, which typically arises below the celiac trunk. *Subclavian artery* - The **subclavian artery** is located in the chest and shoulder region, supplying the upper limbs and parts of the head and neck. - Its anatomical location and distribution are distinctly different from the abdominal artery shown in the image. *Celiac trunk* - The **celiac trunk** is an earlier branch off the aorta, typically arising just below the diaphragm, and it branches into the splenic, left gastric, and common hepatic arteries. - The artery labeled 'X' arises lower than where the celiac trunk would typically originate and demonstrates a different branching pattern. *Brachiocephalic trunk* - The **brachiocephalic trunk** (also known as the innominate artery) is a major artery in the upper chest, typically the first branch off the aortic arch. - It supplies blood to the right arm and head, not abdominal organs, making it anatomically incorrect for the artery labeled 'X'.
Question 5: Which of the following is the best management for radiation induced occlusive disease of carotid artery?
- A. Carotid endarterectomy
- B. Low dose aspirin
- C. Carotid bypass procedure
- D. Carotid angioplasty and stenting (Correct Answer)
Explanation: ***Carotid angioplasty and stenting*** - **Radiation-induced carotid artery disease** often involves the distal part of the carotid artery, making it less amenable to surgical endarterectomy. - **Angioplasty and stenting** offer a less invasive approach with good technical success in these challenging cases, especially given the increased fragility and fibrosis of radiated tissues. *Carotid endarterectomy* - **Carotid endarterectomy** in previously radiated fields is associated with a significantly higher risk of complications, including **cranial nerve injury**, **wound infection**, and **carotid artery rupture**, due to tissue fibrosis and scarring. - The disease often extends beyond the easily accessible segment for endarterectomy in radiation-induced cases. *Low dose aspirin* - **Low-dose aspirin** is an important component of medical therapy for **atherosclerotic disease** and **stroke prevention**, but it is insufficient as a sole treatment for symptomatic or high-grade occlusive disease of the carotid artery. - It helps manage the underlying **atherosclerotic process** but does not directly address the severe stenosis or occlusion. *Carotid bypass procedure* - **Carotid bypass procedures** are complex surgical interventions usually reserved for cases of **carotid artery occlusion** or **recurrent stenosis** after previous interventions where endarterectomy or stenting is not feasible. - While an option, it is more invasive and technically demanding than angioplasty and stenting, particularly in already radiated tissues with compromised vascular integrity.
Question 6: In which condition is the Adson test positive?
- A. Cervical rib (Correct Answer)
- B. Cervical vertebra fracture
- C. Superior vena cava syndrome
- D. Cervical spondylosis
Explanation: ***Cervical rib*** - A **cervical rib** is an extra rib that arises from the seventh cervical vertebra, which can compress neurovascular structures in the **thoracic outlet**. - The **Adson test** assesses for **thoracic outlet syndrome** by checking for a diminished radial pulse during specific arm movements, indicating vascular compression often caused by a cervical rib. *Cervical vertebra fracture* - A **cervical vertebra fracture** is an injury to one of the bones in the neck and is primarily diagnosed with **imaging studies** like X-rays or CT scans. - While it can cause pain and neurological symptoms, the **Adson test** is not used for its diagnosis, as it does not typically involve neurovascular compression in the same manner as thoracic outlet syndrome. *Superior vena cava syndrome* - **Superior vena cava syndrome** involves obstruction of the **superior vena cava**, leading to swelling of the face, neck, and upper extremities. - It is diagnosed based on clinical presentation and **imaging** (e.g., CT venography) and is unrelated to the **thoracic outlet** or the **Adson test**. *Cervical spondylosis* - **Cervical spondylosis** is a degenerative condition of the cervical spine, leading to **neck pain** and potentially neurological deficits due to spinal cord or nerve root compression. - Diagnosis involves **imaging** (X-rays, MRI) to show degenerative changes; the **Adson test** is not a relevant diagnostic tool for this condition.
Question 7: In which one of the following is Branham's sign positive?
- A. Arterial stenosis
- B. Arteriovenous fistula (Correct Answer)
- C. Deep vein thrombosis
- D. Arterial aneurysm
Explanation: ***Arteriovenous fistula*** - **Branham's sign**, also known as Nicoladoni-Branham's sign, is characterized by a **sudden decrease in heart rate** upon compression of an arteriovenous fistula. - This occurs because *compression of the fistula increases systemic vascular resistance, leading to improved venous return and a reflex bradycardia* via vagal stimulation. *Arterial stenosis* - **Arterial stenosis** involves narrowing of an artery and does not typically present with Branham's sign. - While it may cause a **bruit** or **reduced pulse**, compressing the stenotic vessel would not lead to an immediate change in heart rate. *Deep vein thrombosis* - **Deep vein thrombosis (DVT)** is a blood clot in a deep vein, causing pain and swelling, but it is not associated with Branham's sign. - Compression in the area of a DVT would likely worsen pain or dislodge the clot, not alter heart rate in this manner. *Arterial aneurysm* - An **arterial aneurysm** is a localized bulging of an artery wall, which can pulsate but generally does not elicit Branham's sign upon compression. - Compressing an aneurysm could be dangerous and would not result in the reflex bradycardia seen with an arteriovenous fistula.
Question 8: What is the significance of the term 'Corona mortis' in human anatomy?
- A. Anastomosis between superior and inferior gluteal arteries
- B. A ligament connecting the pubic symphysis
- C. A nerve crossing the pelvic brim
- D. Anastomosis between obturator and inferior epigastric vessels (Correct Answer)
Explanation: ***Anastomosis between obturator and inferior epigastric vessels*** - **Corona mortis**, meaning "crown of death" in Latin, refers to a clinically significant vascular anastomosis that passes over the superior pubic ramus. - This anastomosis usually occurs between the **obturator artery** (a branch of the internal iliac artery) and the **inferior epigastric artery** (a branch of the external iliac artery), posing a risk of severe hemorrhage during surgical procedures in the retropubic space [1]. *Anastomosis between superior and inferior gluteal arteries* - While gluteal arteries do anastomose, they form a crucial part of the **cruciate anastomosis of the thigh**, not the corona mortis. - This anastomosis is important for blood supply to the hip joint and thigh musculature, far removed from the retropubic space. *A ligament connecting the pubic symphysis* - The pubic symphysis is connected by ligaments such as the **superior and arcuate pubic ligaments**, which provide stability to the joint. - These are fibrous structures and do not represent a vascular anastomosis. *A nerve crossing the pelvic brim* - Several nerves cross the pelvic brim, such as the **obturator nerve** or the **femoral nerve**, but these are neural structures. - The term corona mortis specifically refers to a **vascular connection**, not a nerve.
Question 9: Pseudoclaudication is caused by:
- A. Lumbar canal stenosis (Correct Answer)
- B. Aortic aneurysm
- C. Peripheral vascular disease
- D. Spinal cord compression
Explanation: ***Lumbar canal stenosis*** - **Pseudoclaudication**, also known as **neurogenic claudication**, is a classic symptom of **lumbar spinal stenosis**. - This condition involves narrowing of the **spinal canal**, which compresses the **nerve roots** and causes pain, numbness, or weakness in the legs during walking. *Aortic aneurysm* - An **aortic aneurysm** is a localized **dilation of the aorta** and typically causes symptoms due to **rupture**, **compression of adjacent structures**, or **thromboembolism**. - It does not directly cause gait-dependent leg symptoms that characterize pseudoclaudication. *Peripheral vascular disease* - **Peripheral vascular disease (PVD)** causes **vascular claudication**, which is characterized by reproducible muscle pain with exercise due to **ischemia**. - Unlike pseudoclaudication, PVD pain is typically relieved by **rest** and is less affected by posture. *Spinal cord compression* - While **spinal cord compression** can cause neurological deficits, it typically presents with **upper motor neuron signs** (e.g., hyperreflexia, spasticity) below the level of compression. - These symptoms are usually more constant and severe than the intermittent, posture-related symptoms of pseudoclaudication, which primarily affects nerve roots.
Question 10: Which of the following statements about Alzheimer's disease is true?
- A. It is the most common cause of dementia. (Correct Answer)
- B. The disease primarily affects people under 50 years of age
- C. One in 2 people age 65 and older has Alzheimer's disease
- D. Alzheimer's disease can be completely cured with current medications
Explanation: ***It is the most common cause of dementia.*** - **Alzheimer's disease** accounts for **60-80% of dementia cases**, making it the leading cause of cognitive decline in older adults. - Its prevalence increases significantly with age, affecting millions worldwide. *The disease primarily affects people under 50 years of age* - This is incorrect; Alzheimer's disease is **predominantly a disease of older adults**. - While early-onset Alzheimer's (before age 65) exists, it accounts for less than 10% of cases. - The vast majority of cases occur in people **aged 65 and older**, with risk increasing dramatically with advancing age. *One in 2 people age 65 and older has Alzheimer's disease* - This figure is a significant overestimation; while prevalence increases with age, approximately **1 in 9 (11.3%) Americans aged 65 and older** have Alzheimer's, not 1 in 2. - The risk doubles every five years after age 65. *Alzheimer's disease can be completely cured with current medications* - Currently, there is **no cure for Alzheimer's disease**. - Available medications can help manage symptoms and slow cognitive decline but do not stop the underlying neurodegenerative process.
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