Bariatric Surgery — MCQs

Bariatric Surgery Indian Medical PG Practice Questions and MCQs

Question 51: Which of the following is NOT considered a bariatric surgery?

A. Banding gastroplasty
B. Roux-en-Y gastric bypass
C. Sleeve gastrectomy
D. Duodenojejunostomy (Correct Answer)

Explanation: **Explanation:** Bariatric surgery (metabolic surgery) is specifically designed to induce weight loss by restricting food intake, causing malabsorption, or a combination of both. **Why Duodenojejunostomy is the correct answer:** A **Duodenojejunostomy** is a surgical bypass procedure typically performed to treat **Superior Mesenteric Artery (SMA) syndrome** or duodenal obstructions (e.g., annular pancreas). It involves creating an anastomosis between the duodenum and the jejunum to bypass an obstruction. It is a reconstructive procedure, not a weight-loss surgery, as it does not significantly alter the absorptive capacity or hormonal signaling required for weight reduction. **Analysis of incorrect options:** * **Banding Gastroplasty (e.g., Vertical Banded Gastroplasty):** A purely **restrictive** procedure where a pouch is created to limit food intake. Though largely replaced by newer methods, it is a classic bariatric surgery. * **Roux-en-Y Gastric Bypass (RYGB):** The "Gold Standard" of bariatric surgery. It is a **combined** procedure (restrictive and malabsorptive) involving a small gastric pouch and a Y-shaped limb of the small intestine. * **Sleeve Gastrectomy:** Currently the most common bariatric procedure worldwide. It is a **restrictive** procedure where the greater curvature of the stomach is removed, also reducing the hunger hormone **Ghrelin**. **High-Yield Clinical Pearls for NEET-PG:** * **Indications for Bariatric Surgery (Asia-Pacific Guidelines):** BMI >35 kg/m² or BMI >32.5 kg/m² with comorbidities (e.g., Type 2 Diabetes, Hypertension). * **Most common nutritional deficiency after RYGB:** Iron deficiency (followed by Vitamin B12, Calcium, and Vitamin D). * **Hormonal changes:** Sleeve gastrectomy and RYGB lead to increased **GLP-1 and PYY**, which improve glycemic control even before significant weight loss occurs. * **Dumping Syndrome:** A common complication of RYGB due to rapid gastric emptying into the small bowel.

Question 52: In addition to the effects of weight loss, what factors are thought to contribute to the resolution of type 2 diabetes mellitus after gastric sleeve and Roux-en-Y gastric bypass (RYGB) procedures?

A. Reduced ghrelin production
B. Increased secretion of glucagon-like peptide-1 (GLP-1)
C. Appetite suppression
D. All of the above (Correct Answer)

Explanation: The resolution of Type 2 Diabetes Mellitus (T2DM) following bariatric surgery occurs through mechanisms far more complex than simple caloric restriction. These procedures are now often termed **"Metabolic Surgery"** due to their profound hormonal effects. ### **Explanation of the Correct Answer (D)** The "Incretin Effect" and hormonal modulation are the primary drivers for T2DM resolution: * **Reduced Ghrelin (Option A):** Ghrelin is an orexigenic (hunger-stimulating) hormone produced mainly in the gastric fundus. In **Sleeve Gastrectomy**, the fundus is removed, and in **RYGB**, it is bypassed. Lower ghrelin levels lead to decreased appetite and improved insulin sensitivity. * **Increased GLP-1 (Option B):** The **"Hindgut Hypothesis"** suggests that the rapid delivery of undigested nutrients to the distal ileum triggers the secretion of L-cells. These cells release **Glucagon-like peptide-1 (GLP-1)** and **Peptide YY (PYY)**. GLP-1 is a potent insulin secretagogue that enhances glucose-dependent insulin release and suppresses glucagon. * **Appetite Suppression (Option C):** This is a combined result of mechanical restriction, reduced ghrelin, and increased PYY/GLP-1, which act on the hypothalamus to increase satiety. ### **Why other options are included** Options A, B, and C are all independent physiological contributors to the metabolic success of these surgeries. Therefore, **"All of the above"** is the most comprehensive answer. ### **NEET-PG High-Yield Pearls** * **RYGB vs. Sleeve:** RYGB generally has a higher rate of T2DM remission compared to Sleeve Gastrectomy due to the additional malabsorptive component and stronger incretin response. * **Foregut Hypothesis:** Proposes that bypassing the proximal small intestine (duodenum) prevents the release of "anti-incretin" factors that promote insulin resistance. * **Resolution Timing:** T2DM often improves within days of surgery, well before significant weight loss occurs, proving the hormonal basis of the recovery.

Question 53: What is the most common presentation of carcinoma of the rectum?

A. Diarrhea
B. Constipation
C. Bleeding per rectum (Correct Answer)
D. Feeling of incomplete defecation

Explanation: **Explanation:** The most common clinical presentation of carcinoma of the rectum is **bleeding per rectum** (hematochezia). This occurs because the tumor surface is friable and prone to ulceration as fecal matter passes through the narrow rectal vault. Unlike proximal colonic cancers where blood is often mixed with stool (melena or occult blood), rectal bleeding is typically bright red and may be associated with mucus (spurious diarrhea). **Analysis of Options:** * **Bleeding per rectum (Correct):** It is the earliest and most frequent symptom, reported by over 60-80% of patients. * **Diarrhea (Incorrect):** While patients may complain of "spurious diarrhea" (frequent passage of mucus and blood), true diarrhea is not the primary presentation. * **Constipation (Incorrect):** This is more common in left-sided colonic cancers (descending/sigmoid colon) where the lumen is narrower and the stool is more solid, leading to obstructive symptoms. * **Feeling of incomplete defecation (Incorrect):** Also known as **tenesmus**, this is a classic symptom of rectal cancer caused by the tumor mass mimicking the presence of stool, but it usually occurs later than the initial bleeding. **Clinical Pearls for NEET-PG:** * **Most common site of colorectal cancer:** Rectum (followed by the Sigmoid colon). * **Digital Rectal Examination (DRE):** Essential bedside test; approximately 35-45% of rectal cancers are within reach of the finger. * **Gold Standard Investigation:** Colonoscopy with biopsy. * **Staging Investigation of Choice:** MRI Pelvis (for local staging/T-category) and CT Chest/Abdomen (for distant metastasis). * **CEA (Carcinoembryonic Antigen):** Not for diagnosis, but the best marker for monitoring recurrence and prognosis.

Question 54: Bilateral subconjunctival ecchymosis is not associated with which of the following fractures?

A. Le-Fort II fracture
B. Le-Fort III fracture
C. Naso ethmoidal complex fracture
D. Le-Fort I fracture (Correct Answer)

Explanation: **Explanation:** The presence of **bilateral subconjunctival ecchymosis** (without a posterior limit) is a clinical hallmark of fractures involving the **orbital walls** or the **base of the skull**. **Why Le-Fort I is the correct answer:** Le-Fort I, also known as a **Guerin fracture** or horizontal maxillary fracture, involves a low-level horizontal line passing above the apices of the teeth, through the maxillary sinus, and the lower part of the pterygoid plates. Crucially, the fracture line in Le-Fort I **does not involve the orbits**. Therefore, it does not cause subconjunctival hemorrhage or periorbital edema. **Analysis of incorrect options:** * **Le-Fort II (Pyramidal fracture):** The fracture line extends through the **infraorbital margin** and the floor of the orbit. This bony disruption leads to bleeding into the subconjunctival space. * **Le-Fort III (Craniofacial disjunction):** This involves complete separation of the midface from the skull base. The fracture line passes through the **lateral and medial orbital walls** and the orbital floor, making bilateral subconjunctival ecchymosis a classic finding. * **Naso-ethmoidal complex (NOE) fracture:** These fractures involve the ethmoid bone and the medial wall of the orbit. The proximity to the orbital contents frequently results in subconjunctival hemorrhage. **High-Yield Clinical Pearls for NEET-PG:** * **Subconjunctival Hemorrhage:** If you cannot see the **posterior limit** of the hemorrhage, it suggests blood is tracking forward from a fracture of the orbital walls or base of the skull (e.g., Battle sign/Raccoon eyes). * **Le-Fort I:** Characterized by a "floating palate." * **Le-Fort II:** Characterized by "step-off" deformity at the infraorbital margin and anesthesia in the distribution of the infraorbital nerve. * **Le-Fort III:** Characterized by "dish-face" deformity and lengthening of the face.

Question 55: Ulcerative colitis almost always involves which part of the colon?

A. Caecum
B. Sigmoid colon
C. Right colon
D. Rectum (Correct Answer)

Explanation: **Explanation:** Ulcerative Colitis (UC) is a chronic inflammatory bowel disease characterized by diffuse, continuous mucosal inflammation. The hallmark of UC is its **rectal involvement**, which occurs in approximately **95% of cases**. The disease typically starts in the rectum (proctitis) and extends proximally in a continuous, symmetrical fashion without "skip lesions." **Why the Rectum is Correct:** The rectum is the most common site of involvement and is almost always affected. In fact, if the rectum is completely spared in an untreated patient, the diagnosis of Ulcerative Colitis should be questioned, and Crohn’s disease should be considered. **Why other options are incorrect:** * **A & C (Caecum and Right Colon):** These are involved only in cases of "Pancolitis" (extension beyond the splenic flexure). While the caecum can sometimes show a "caecal patch" (periappendiceal inflammation) in distal UC, it is not the primary or most frequent site. * **B (Sigmoid Colon):** While the sigmoid is frequently involved as the disease progresses proximally from the rectum, it is not the universal starting point or the most consistently involved segment compared to the rectum. **High-Yield Clinical Pearls for NEET-PG:** * **Continuous Involvement:** Unlike Crohn’s, UC does not have skip lesions. * **Lead Pipe Appearance:** Chronic UC leads to loss of haustrations, seen on barium enema. * **Backwash Ileitis:** In severe pancolitis, the terminal ileum may show superficial inflammation (not to be confused with the transmural involvement of Crohn’s). * **Surgery:** Proctocolectomy with Ileal Pouch-Anal Anastomosis (IPAA) is the gold standard surgical treatment and is considered curative.

Question 56: All are true about thymoma except?

A. Most common tumor in the anterior mediastinum
B. Treatment is thymectomy
C. Symptomatic cases present as endocrine abnormalities (Correct Answer)
D. May be associated with myasthenia gravis

Explanation: ### Explanation **Thymoma** is the most common primary tumor of the anterior mediastinum. Understanding its clinical presentation and management is crucial for NEET-PG. **Why Option C is the correct answer (The "Except"):** Symptomatic thymomas typically present with **compressive symptoms** (cough, chest pain, dyspnea, or Superior Vena Cava syndrome) or **paraneoplastic syndromes** (autoimmune in nature). They do **not** typically present with endocrine abnormalities. Endocrine presentations are more characteristic of other mediastinal masses, such as substernal thyroid goiters or ectopic parathyroid adenomas. **Analysis of Incorrect Options:** * **Option A:** Thymoma is indeed the **most common tumor** of the anterior mediastinum in adults (followed by germ cell tumors and lymphomas). * **Option B:** The mainstay of treatment for thymoma is **complete surgical excision (thymectomy)**, often via a median sternotomy or VATS, regardless of the presence of Myasthenia Gravis. * **Option D:** Approximately **30–45%** of patients with thymoma have **Myasthenia Gravis (MG)**. Conversely, only 10–15% of patients with MG are found to have a thymoma. **Clinical Pearls for NEET-PG:** * **Associated Conditions:** Besides MG, thymoma is associated with **Pure Red Cell Aplasia** and **Hypogammaglobulinemia** (Good’s Syndrome). * **Masaoka Staging:** This is the most widely used clinical staging system for thymomas, based on capsular invasion. * **Histology:** Most thymomas are cytologically benign; "malignancy" is determined by the degree of local invasion into surrounding structures rather than cellular features.

Question 57: A patient presents with vomiting and severe colicky abdominal pain following bariatric surgery performed five years ago. An emergency reoperation is advised. Which of the following procedures did the patient most likely undergo five years ago?

A. Laparoscopic Roux-en-Y gastric bypass (Correct Answer)
B. Laparoscopic adjustable gastric banding
C. Sleeve gastrectomy
D. Biliopancreatic division

Explanation: **Explanation:** The clinical presentation of severe colicky abdominal pain and vomiting years after bariatric surgery is highly suggestive of an **internal hernia** causing small bowel obstruction. This is a classic long-term complication specifically associated with **Laparoscopic Roux-en-Y Gastric Bypass (LRYGB)**. **1. Why Option A is Correct:** In LRYGB, the creation of a Roux limb creates potential spaces in the mesentery, most notably **Petersen’s space** (between the Roux limb mesentery and the transverse mesocolon). Small bowel loops can herniate through these defects. Unlike early complications (like leaks), internal hernias often present years later. The "colicky" nature of the pain is characteristic of intermittent bowel incarceration. **2. Why the Other Options are Incorrect:** * **B. Laparoscopic Adjustable Gastric Banding:** Complications usually involve band slippage, erosion, or pouch dilation. While it can cause vomiting, it does not involve mesenteric rearrangements that lead to internal hernias. * **C. Sleeve Gastrectomy:** This is a restrictive procedure that does not involve bowel bypass or mesenteric defects; therefore, the risk of internal hernia is virtually non-existent. * **D. Biliopancreatic Diversion (BPD):** While BPD can cause internal hernias, LRYGB is the much more common procedure globally and in exam scenarios. Furthermore, BPD typically presents with significant malabsorptive symptoms (steatorrhea, vitamin deficiencies) rather than isolated late-onset obstruction. **Clinical Pearls for NEET-PG:** * **Petersen’s Hernia:** The most common site of internal hernia after LRYGB. * **Diagnostic Challenge:** CT scans can be negative in 20% of cases; a high index of clinical suspicion is required. * **Surgical Technique:** The incidence of internal hernia is higher in laparoscopic surgery compared to open surgery (due to fewer adhesions to keep bowel in place) and when the Roux limb is placed **antecolic**. * **Gold Standard:** Closure of all mesenteric defects during the primary surgery is the best preventive measure.

Question 58: Which of the following is NOT considered a standard bariatric surgical procedure?

A. Gastric Banding
B. Gastric Bypass
C. Biliopancreatic Diversion
D. Ileal Transposition (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Ileal Transposition**. In bariatric surgery, procedures are classified based on their mechanism: **Restrictive** (limiting intake), **Malabsorptive** (limiting calorie absorption), or **Hybrid** (both). * **Why Ileal Transposition is the correct answer:** Ileal transposition is primarily considered a **metabolic surgery** rather than a standard bariatric procedure. It involves moving a segment of the distal ileum to the proximal jejunum to trigger early secretion of GLP-1 (incretin effect). While it helps in weight loss, its primary clinical indication is the management of **Type 2 Diabetes Mellitus** in non-obese or mildly obese patients. It is not listed as a standard weight-loss procedure by major surgical societies (like ASMBS). * **Why the other options are incorrect:** * **Gastric Banding (A):** A classic **restrictive** procedure where an adjustable band is placed around the cardia of the stomach. * **Gastric Bypass (B):** Specifically the Roux-en-Y Gastric Bypass (RYGB), which is the **"Gold Standard"** bariatric procedure. It is a **hybrid** procedure. * **Biliopancreatic Diversion (C):** A complex, primarily **malabsorptive** procedure (often with a Duodenal Switch) reserved for the super-obese (BMI >50). **High-Yield Clinical Pearls for NEET-PG:** * **Most common procedure worldwide:** Sleeve Gastrectomy (Restrictive). * **Most effective for long-term weight loss:** Biliopancreatic Diversion (BPD). * **Indication for Bariatric Surgery in India (OESI/IFSO guidelines):** BMI >35 kg/m² or BMI >32.5 kg/m² with comorbidities (e.g., T2DM, HTN). * **Dumping Syndrome:** A common complication of Gastric Bypass due to the loss of pyloric control.

Question 59: Which of the following are complications of obesity?

A. Venous ulcer, Pulmonary embolism, Pickwickian syndrome, and Hernias
B. Pulmonary embolism, Pickwickian syndrome, Hernias, and Pulmonary hypertension
C. Venous ulcer, Pulmonary embolism, Pickwickian syndrome, and Pulmonary hypertension
D. All are true (Correct Answer)

Explanation: Obesity is a multisystem chronic disease that acts as a significant risk factor for numerous surgical and medical complications. The correct answer is **D (All are true)** because obesity affects hemodynamics, respiratory mechanics, and intra-abdominal pressure. ### **Pathophysiological Breakdown:** 1. **Venous Ulcers & Pulmonary Embolism (PE):** Obesity leads to chronic venous insufficiency due to increased intra-abdominal pressure and reduced physical activity, causing venous stasis and ulcers. Furthermore, obesity is a **prothrombotic state** (increased PAI-1 and fibrinogen), significantly raising the risk of Deep Vein Thrombosis (DVT) and subsequent PE. 2. **Pickwickian Syndrome (Obesity Hypoventilation Syndrome):** This is defined by the triad of obesity (BMI >30 kg/m²), daytime hypoventilation (PaCO2 >45 mmHg), and sleep-disordered breathing. 3. **Hernias:** Increased intra-abdominal pressure and weakened fascia due to fatty infiltration make obese patients highly prone to incisional, umbilical, and hiatal hernias. 4. **Pulmonary Hypertension:** This occurs secondary to chronic hypoxia from obstructive sleep apnea (OSA) or Pickwickian syndrome, leading to pulmonary vasoconstriction and right-sided heart strain. ### **Analysis of Options:** * **Options A, B, and C** are technically correct in their listings but are **incomplete**. Since all conditions mentioned across these options are established complications of obesity, "All are true" is the most accurate choice for a competitive exam. ### **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of death post-Bariatric Surgery:** Pulmonary Embolism (followed by gastric leak). * **Metabolic Syndrome Criteria:** Includes waist circumference (>90 cm in Asian men, >80 cm in Asian women), triglycerides, HDL, BP, and fasting glucose. * **Bariatric Surgery Indications:** BMI >40 kg/m² or BMI >35 kg/m² with comorbidities (In Asians: >35 and >32.5 respectively).

Question 60: All of the following are surgical options for morbid obesity except?

A. Adjustable gastric banding
B. Biliopancreatic diversion
C. Duodenal switch
D. Roux-en-Y duodenal bypass (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Roux-en-Y duodenal bypass**. This is a distractor term; the standard, gold-standard bariatric procedure is the **Roux-en-Y Gastric Bypass (RYGB)**, not a "duodenal" bypass. In RYGB, a small gastric pouch is created and connected to the jejunum (gastrojejunostomy), bypassing the distal stomach and duodenum. **Analysis of Options:** * **A. Adjustable Gastric Banding:** A restrictive procedure where an inflatable silicone band is placed around the upper stomach. It is less common now due to long-term complications but remains a recognized surgical option. * **B. Biliopancreatic Diversion (BPD):** A primarily malabsorptive procedure (Scopinaro procedure) involving a distal gastrectomy and a long Roux-en-Y limb. * **C. Duodenal Switch:** Usually combined with a Biliopancreatic Diversion (BPD-DS). It involves a sleeve gastrectomy and a bypass that redirects bile and pancreatic juices to the terminal ileum, limiting calorie absorption. **High-Yield Clinical Pearls for NEET-PG:** * **Indications for Bariatric Surgery (IFSO/OSSGB Guidelines):** BMI >35 kg/m² or BMI >32.5 kg/m² with comorbidities (e.g., Type 2 Diabetes, Hypertension) in the Indian population. * **Gold Standard:** Roux-en-Y Gastric Bypass (RYGB) is considered the gold standard. * **Most Common Procedure:** Currently, **Sleeve Gastrectomy** is the most frequently performed bariatric surgery worldwide. * **Mechanism:** Procedures are classified as **Restrictive** (Sleeve, Banding), **Malabsorptive** (BPD), or **Mixed** (RYGB). * **Metabolic Benefit:** Bariatric surgery is now often called "Metabolic Surgery" due to its rapid effect on resolving Type 2 Diabetes, often before significant weight loss occurs, via the "incretin effect."

Practice by Chapter

Pathophysiology of Obesity

Practice Questions

Patient Selection and Preoperative Evaluation

Practice Questions

Restrictive Procedures

Practice Questions

Malabsorptive Procedures

Practice Questions

Sleeve Gastrectomy

Practice Questions

Roux-en-Y Gastric Bypass

Practice Questions

Biliopancreatic Diversion

Practice Questions

Adjustable Gastric Banding

Practice Questions

Revisional Bariatric Surgery

Practice Questions

Postoperative Management

Practice Questions

Nutritional Considerations

Practice Questions

Metabolic Effects of Bariatric Surgery

Practice Questions

Want unlimited practice?

Get full access to all questions, explanations, and performance tracking.

Start For Free