Roux-en-Y Gastric Bypass — MCQs
In orthotopic liver transplantation, which is the best way to achieve bile drainage in the donor liver
FESS means:
A patient underwent a gastrectomy. Which vitamin replacement is required?
What is the primary effect of GLP-1 on insulin secretion?
A 45 year old lawyer presents with pain in the abdomen more so in the epigastric region that worsens with eating spicy food and is relieved by bending forward. Complications of the above mentioned condition could be all except:
Surgery was performed as shown in the image below. What is the name of the procedure?
Gold standard procedure to reduce recurrence of pterygium after surgical excision is
Which of the following is NOT true about ghrelin?
Following complete ileal and partial jejunal resection, the patient is most likely to have-
All of the following are primarily restrictive operations for morbid obesity, except which of the following?
Roux-en-Y Gastric Bypass Indian Medical PG Practice Questions and MCQs
Question 1: In orthotopic liver transplantation, which is the best way to achieve bile drainage in the donor liver
- A. Donor bile duct with recipient bile duct or Roux-en-Y choledochojejunostomy (Correct Answer)
- B. Donor bile duct with jejunum of recipient
- C. Donor bile duct with duodenum of recipient
- D. External drainage for a few days followed by choledochojejunostomy
Explanation: ***Donor bile duct with recipient bile duct or Roux en Y choledochojejunostomy*** - The most common and preferred method for bile drainage in **orthotopic liver transplantation** is a **duct-to-duct anastomosis** between the donor and recipient bile ducts. - If a primary duct-to-duct anastomosis is not feasible due to size mismatch, damage, or other reasons, a **Roux-en-Y choledochojejunostomy** is performed, which involves connecting the donor bile duct to a Roux limb of the jejunum. *External drainage for few days followed by choledochojejunostomy* - **External bile drainage** is generally avoided in liver transplantation due to increased risks of **infection** and complications like **bile leaks**. - It does not provide a definitive long-term solution for bile flow and necessitates a secondary, more complex surgical procedure for permanent drainage. *Donor bile duct with jejunum of recipient* - Connecting the donor bile duct directly to the jejunum (without a Roux-en-Y limb) would expose the biliary tree to **intestinal contents**, increasing the risk of **ascending cholangitis**. - The Roux-en-Y configuration is crucial to prevent reflux of food and bacteria into the biliary system, which is not achieved by a simple choledochojejunostomy. *Donor bile duct with duodenum of recipient* - Anastomosing the donor bile duct directly to the **duodenum** significantly increases the risk of **reflux of duodenal contents**, including digestive enzymes and bacteria, into the biliary system. - This reflux can lead to severe and recurrent **cholangitis**, stricture formation, and potential graft failure due to chronic inflammation and infection.
Question 2: FESS means:
- A. Flexible endoscopic sinus surgery
- B. Functional endoscopic sinus surgery (Correct Answer)
- C. Fibroscopic endoscopic sinus surgery
- D. Frontal endoscopic sinus surgery
Explanation: ***Functional endoscopic sinus surgery*** - **FESS** is a minimally invasive surgical technique used to treat **chronic sinusitis** and other sinus conditions. - The goal of FESS is to restore normal sinus function and ventilation by removing obstructions and diseased tissue. *Flexible endoscopic sinus surgery* - This term is incorrect; while FESS uses endoscopes, they are generally rigid, not flexible, for better visualization and instrumentation. - **Flexible endoscopes** are more commonly used for procedures like bronchoscopy or colonoscopy. *Fibroscopic endoscopic sinus surgery* - The term **fibroscopic** is typically associated with scopes employing fiber optics but is not the correct full form of the acronym FESS. - This option incorrectly modifies the standard medical terminology for this procedure. *Frontal endoscopic sinus surgery* - While FESS can be performed on the **frontal sinuses**, this option is too specific and does not represent the complete and correct expansion of the acronym. - FESS encompasses procedures on all paranasal sinuses, not just the frontal sinus.
Question 3: A patient underwent a gastrectomy. Which vitamin replacement is required?
- A. Vitamin A
- B. Vitamin C
- C. Vitamin D
- D. Vitamin B12 (Correct Answer)
Explanation: ***Vitamin B12*** - **Gastrectomy** removes all or part of the stomach, which is the site of **intrinsic factor** production by parietal cells. - Intrinsic factor is essential for the absorption of **Vitamin B12** (cobalamin) in the terminal ileum; without it, severe B12 deficiency will develop [1]. *Vitamin A* - Vitamin A (retinol) is a **fat-soluble vitamin** primarily absorbed in the small intestine, and its absorption is generally not directly affected by gastrectomy. - Deficiency is usually linked to malabsorption syndromes affecting the small intestine or severe hepatic dysfunction. *Vitamin C* - Vitamin C (ascorbic acid) is a **water-soluble vitamin** absorbed in the small intestine, and its absorption is largely independent of gastric function. - While gastrectomy might impact overall nutrient intake, there's no specific mechanism linking it directly to Vitamin C malabsorption. *Vitamin D* - Vitamin D is a **fat-soluble vitamin** absorbed in the small intestine, and its absorption is primarily dependent on the presence of bile salts and an intact small bowel. - Gastrectomy does not directly impair Vitamin D absorption, although general nutritional deficiencies can occur if dietary intake is insufficient post-surgery.
Question 4: What is the primary effect of GLP-1 on insulin secretion?
- A. Increased aldosterone secretion by adrenal
- B. Increased PTH secretion
- C. Increased insulin secretion from beta-cells of pancreas (Correct Answer)
- D. Increased testosterone secretion from Leydig cells
Explanation: ***Increased insulin secretion from beta-cells of pancreas*** - **Glucagon-like peptide-1 (GLP-1)** is an **incretin hormone** that stimulates **glucose-dependent insulin secretion** from pancreatic beta-cells. - This effect is crucial for maintaining **glucose homeostasis**, especially after a meal. *Increased aldosterone secretion by adrenal* - **Aldosterone secretion** is primarily regulated by the **renin-angiotensin-aldosterone system (RAAS)** and potassium levels, not directly by GLP-1. - Aldosterone's main function is to regulate **sodium and water balance** and **blood pressure**. *Increased PTH secretion* - **Parathyroid hormone (PTH)** secretion is primarily regulated by **serum calcium levels**. - Its main role is to maintain **calcium homeostasis** by affecting bone, kidney, and intestine. *Increased testosterone secretion from Leydig cells* - **Testosterone secretion** from Leydig cells is primarily regulated by **luteinizing hormone (LH)** from the pituitary gland. - GLP-1 has no direct significant role in **gonadal steroidogenesis**.
Question 5: A 45 year old lawyer presents with pain in the abdomen more so in the epigastric region that worsens with eating spicy food and is relieved by bending forward. Complications of the above mentioned condition could be all except:
- A. Splenic Vein Thrombosis (Correct Answer)
- B. Bleeding
- C. Gastric Outlet Obstruction
- D. Perforation
Explanation: ***Splenic Vein Thrombosis*** - The patient's symptoms (epigastric pain worsening with spicy food, relieved by bending forward) are highly suggestive of **pancreatitis**, not peptic ulcer disease [1]. **Splenic vein thrombosis** is a known complication of chronic pancreatitis due to inflammation and compression of the splenic vein [2]. - While pancreatitis can cause significant morbidity, **splenic vein thrombosis** is a specific vascular complication associated with prolonged inflammation of the pancreas, leading to localized portal hypertension and potentially isolated gastric varices. *Perforation* - **Perforation** (specifically of a peptic ulcer or potentially surrounding bowel in severe pancreatitis) is a severe complication that can occur in conditions causing abdominal pain, but it is not the *exception* among the given options for the likely underlying condition indicated by the patient's symptoms (pancreatitis) [3]. - This complication typically leads to **peritonitis**, a medical emergency requiring immediate surgical intervention [3]. *Bleeding* - **Bleeding** (e.g., from a pancreatic pseudocyst rupturing into the gastrointestinal tract or from localized varices secondary to portal hypertension in pancreatitis) is a recognized complication of the patient's likely underlying condition [1]. - Gastrointestinal bleeding can also result from **gastric erosions** or ulcers exacerbated by ongoing inflammation. *Gastric Outlet Obstruction* - **Gastric outlet obstruction** can occur as a complication of severe or chronic pancreatitis, often due to **inflammation**, **fibrosis**, or **pseudocyst formation** compressing the duodenum [1]. - This typically presents with **postprandial vomiting** and early satiety, which can arise in the context of chronic pancreatic inflammation.
Question 6: Surgery was performed as shown in the image below. What is the name of the procedure?
- A. Below knee amputation
- B. Above knee amputation
- C. Lisfranc amputation
- D. Chopart amputation (Correct Answer)
Explanation: ***Chopart amputation*** - The image shows a disarticulation through the **talonavicular and calcaneocuboid joints**, which defines a **Chopart amputation**. - This procedure removes the distal foot while preserving the **calcaneus and talus**, forming a stump that allows for some ankle motion. *Below knee amputation* - A below-knee amputation involves transection of the tibia and fibula, preserving the knee joint, which is much more proximal than shown in the image. - This type of amputation removes a significant portion of the lower leg, with the foot entirely removed, unlike the partial foot amputation depicted. *Above knee amputation* - An above-knee amputation involves disarticulation or transection through the femur, completely removing the lower leg and knee joint. - This is a much more extensive amputation than what is illustrated, which is confined to the foot. *Lisfranc amputation* - A Lisfranc amputation is a disarticulation through the **tarsometatarsal joints**, removing the metatarsals and phalanges but preserving the tarsal bones. - The image clearly shows the incision more proximally, at the midtarsal level, specifically through the talonavicular and calcaneocuboid joints, not the tarsometatarsal joints.
Question 7: Gold standard procedure to reduce recurrence of pterygium after surgical excision is
- A. Thiotepa
- B. Amniotic membrane grafting
- C. Conjunctival autograft (Correct Answer)
- D. Beta-radiation
Explanation: ***Conjunctival autograft*** - **Conjunctival autografting** involves transplanting a piece of healthy conjunctiva from the superior bulbar conjunctiva to the bare scleral bed after pterygium excision, acting as a barrier to fibrovascular proliferation. - This technique has consistently shown the **lowest recurrence rates** in comparative studies, making it the **gold standard** for preventing pterygium recurrence due to its high success rate and safety profile. *Thiotepa* - **Thiotepa** is an **antimetabolite** that inhibits DNA synthesis and cell proliferation, used topically post-excision to reduce recurrence by suppressing fibroblast activity. - While it can lower recurrence rates compared to simple excision, its efficacy is generally **less than conjunctival autografting**, and it carries risks of corneal toxicity and limbal stem cell deficiency. *Amniotic membrane grafting* - **Amniotic membrane grafting** involves placing processed amniotic membrane over the scleral bed, which has anti-inflammatory, anti-scarring, and pro-epithelialization properties. - It is an effective option, especially for **large pterygia** or for patients at high risk of recurrence, but its recurrence rates are generally **not as low as those achieved with conjunctival autografting**, and the graft can sometimes detach. *B- radiation* - **Beta-radiation** (strontium-90) is a form of adjuvant therapy applied to the scleral bed immediately after pterygium excision to inhibit fibroblast proliferation and reduce recurrence. - It is effective but associated with potential complications such as **scleral melt**, corneal scarring, and cataract formation, making it a less preferred option than conjunctival autografting, especially in primary cases.
Question 8: Which of the following is NOT true about ghrelin?
- A. Has anorexic effect (Correct Answer)
- B. Stimulates growth hormone release
- C. Secreted by gastric fundus cells
- D. Increases gastric motility
Explanation: ***Has anorexic effect*** - Ghrelin is known as the **"hunger hormone"** because it stimulates appetite and has an **orexigenic effect**, meaning it increases food intake. - Therefore, stating that it has an **anorexic effect** (reduces appetite) is incorrect. *Stimulates growth hormone release* - Ghrelin is a **natural ligand** for the **growth hormone secretagogue receptor (GHSR)**. - This binding leads to the stimulation of **growth hormone (GH)** release from the pituitary gland. *Secreted by gastric fundus cells* - The primary source of ghrelin in the body is the **P/D1 cells** found in the mucosa of the **gastric fundus**. - Smaller amounts are also produced in the small intestine, pancreas, and hypothalamus. *Increases gastric motility* - Ghrelin is involved in regulating stomach function and can **increase gastric motility** and acid secretion. - This action helps to prepare the digestive system for incoming food.
Question 9: Following complete ileal and partial jejunal resection, the patient is most likely to have-
- A. Constipation
- B. Gastric ulcer
- C. Folic acid deficiency
- D. Vitamin B12 Deficiency (Correct Answer)
Explanation: ***Vitamin B12 Deficiency*** - The **terminal ileum** is the primary site for **vitamin B12 absorption**, complexed with intrinsic factor [3]. Resection of this segment significantly impairs this process. - Patients with **ileal resection** are highly susceptible to developing **megaloblastic anemia** and neurological complications due to **vitamin B12 deficiency** [3]. *Constipation* - Complete ileal and partial jejunal resection is **more likely to cause diarrhea** rather than constipation, particularly due to malabsorption of bile salts and fats [2]. - **Bile salt malabsorption** in the colon often leads to secretory diarrhea [1]. *Gastric ulcer* - Gastric ulcers are typically associated with *Helicobacter pylori* infection or NSAID use, and are **not a direct consequence** of ileal and jejunal resection. - While short bowel syndrome can sometimes lead to increased gastric acid secretion, peptic ulcer formation is not the most likely or direct complication. *Folic acid deficiency* - **Folic acid** is primarily absorbed in the **jejunum**, and while partial jejunal resection occurred, complete ileal resection is less directly implicated in folate deficiency. - Other sections of the small intestine can often compensate for partial jejunal loss in folate absorption, making B12 deficiency a more immediate and severe concern after complete ileal resection.
Question 10: All of the following are primarily restrictive operations for morbid obesity, except which of the following?
- A. Laparoscopic adjustable gastric banding
- B. Roux-en-Y operation (Correct Answer)
- C. Vertical band gastroplasty
- D. Duodenal switch operation
Explanation: **Roux-en-Y operation** - The **Roux-en-Y gastric bypass** is considered a **malabsorptive as well as a restrictive procedure** because it creates a small gastric pouch and bypasses a significant portion of the small intestine. - This dual mechanism leads to greater weight loss compared to purely restrictive surgeries. *Vertical band gastroplasty* - **Vertical band gastroplasty** is a **purely restrictive procedure** that creates a small pouch and restricts outflow, but does not involve nutrient malabsorption. - It is less commonly performed now due to higher rates of weight regain and complications compared to other bariatric surgeries. *Laparoscopic adjustable gastric banding* - **Laparoscopic adjustable gastric banding** is a **purely restrictive procedure** where an inflatable band is placed around the upper part of the stomach to create a small pouch. - This limits the amount of food that can be consumed at one time and slows gastric emptying, but does not alter nutrient absorption. *Switch duodenal operation* - The **duodenal switch operation** (biliopancreatic diversion with duodenal switch) is primarily a **malabsorptive procedure** with a restrictive component. - While it includes creation of a small gastric pouch, its most significant effect on weight loss comes from bypassing a large portion of the small intestine, leading to **significant malabsorption**.
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