Bariatric Surgery Principles — MCQs
Which of the following is not the criteria for diagnosis of Metabolic syndrome?
Which among the following is the function of ghrelin?
A patient underwent a gastrectomy. Which vitamin replacement is required?
All of the following are primarily restrictive operations for morbid obesity, except which of the following?
An obese patient undergoes a gastric bypass procedure to lose weight but never returns for follow-up or continuing care. Three years later, he presents to an emergency room with fatigue, a glossy tongue, and a macrocytic and hyperchromic anemia. Which one of the following is deficient or malfunctioning in this patient, leading to this anemia?
What is the BMI range for overweight classification?
Following complete ileal and partial jejunal resection, the patient is most likely to have-
A patient scheduled for elective inguinal hernia surgery has a history of myocardial infarction (MI) and underwent coronary artery bypass grafting (CABG). What should be included in the preoperative assessment?
Which of the following is true about Zenker's diverticulum?
Dohlman surgery in Zenker's diverticulum is:-
Bariatric Surgery Principles Indian Medical PG Practice Questions and MCQs
Question 1: Which of the following is not the criteria for diagnosis of Metabolic syndrome?
- A. High LDL (Correct Answer)
- B. Hyperiglyceridemia
- C. Hypertension
- D. Central obesity
Explanation: ***High LDL*** - While **high LDL (low-density lipoprotein)** is a risk factor for cardiovascular disease [1], it is **not** one of the specific diagnostic criteria for metabolic syndrome. - The criteria for metabolic syndrome focus on a cluster of metabolic abnormalities associated with insulin resistance. *Hypertriglyceridemia* - **Elevated triglycerides** (typically ≥ 150 mg/dL or on drug treatment for elevated triglycerides) is one of the key diagnostic criteria for metabolic syndrome. - It reflects impaired lipid metabolism often associated with insulin resistance [2]. *Hypertension* - **Elevated blood pressure** (systolic ≥ 130 mmHg or diastolic ≥ 85 mmHg, or on antihypertensive drug treatment) is a core component of metabolic syndrome. - Hypertension in this context is often linked to underlying insulin resistance. *Central obesity* - **Increased waist circumference** (varying by ethnicity and sex, e.g., >102 cm in men and >88 cm in women for adults of European descent) is a primary criterion for metabolic syndrome. - It is a strong indicator of visceral fat accumulation, which is closely linked to insulin resistance [3].
Question 2: Which among the following is the function of ghrelin?
- A. Suppression of appetite
- B. Stimulation of sleep
- C. Stimulation of appetite (Correct Answer)
- D. Regulation of gastric motility
Explanation: ***Stimulation of appetite*** - **Ghrelin** is often referred to as the **"hunger hormone"** because its primary function is to stimulate appetite. - Levels of ghrelin typically rise before meals and decrease after eating, signaling the brain to initiate food intake. *Suppression of appetite* - Hormones like **leptin** and **cholecystokinin (CCK)** are known to suppress appetite, acting as satiety signals. - Ghrelin has the opposite effect, promoting feelings of hunger rather than fullness. *Stimulation of sleep* - While ghrelin levels can influence **sleep-wake cycles** through its effects on the **hypothalamus**, its primary and most direct function is not the stimulation of sleep. - Sleep regulation is a complex process involving multiple neurotransmitters and hormones distinct from ghrelin's main role in hunger. *Regulation of gastric motility* - Although ghrelin can have some effects on **gastrointestinal motility**, its main function is not to regulate it. - Gastric motility is primarily influenced by hormones like **motilin** and the **enteric nervous system**.
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: 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**.
Question 5: An obese patient undergoes a gastric bypass procedure to lose weight but never returns for follow-up or continuing care. Three years later, he presents to an emergency room with fatigue, a glossy tongue, and a macrocytic and hyperchromic anemia. Which one of the following is deficient or malfunctioning in this patient, leading to this anemia?
- A. Intrinsic factor (Correct Answer)
- B. Gastrin
- C. Iron
- D. Lead
Explanation: ***Intrinsic factor*** - This patient's symptoms (fatigue, glossitis, macrocytic, and hyperchromic anemia) strongly suggest **vitamin B12 deficiency**, which often results from insufficient intrinsic factor. [1] - **Gastric bypass surgery** can lead to reduced gastric acid secretion and a decreased production of intrinsic factor, both of which are crucial for vitamin B12 absorption in the terminal ileum. [1] *Gastrin* - **Gastrin** primarily regulates gastric acid secretion and mucosal growth, but its deficiency is not a typical direct cause of macrocytic anemia. - While gastrin production can be altered in certain gastric conditions, it's not the primary factor in **vitamin B12 malabsorption** post-gastric bypass. *Iron* - An **iron deficiency** would typically present as **microcytic, hypochromic anemia**, not macrocytic and hyperchromic anemia. [2] - The symptoms described (glossy tongue, specific type of anemia) are inconsistent with isolated iron deficiency. [3] *Lead* - **Lead poisoning** can cause anemia (often microcytic or normocytic, and sometimes with **basophilic stippling**), but it does not lead to a **glossy tongue** or **macrocytic, hyperchromic anemia**. - The clinical presentation is not suggestive of lead toxicity.
Question 6: What is the BMI range for overweight classification?
- A. 18-20
- B. 15-18
- C. 25 to 29.99 (Correct Answer)
- D. None of the options
Explanation: ***25 to 29.99*** - A **Body Mass Index (BMI)** between **25.0 and 29.9 kg/m²** is classified as **overweight** according to the World Health Organization (WHO) and other major health organizations. - This range indicates an elevated risk for various health problems such as **type 2 diabetes**, **hypertension**, and **cardiovascular diseases**. *18-20* - A BMI range of **18.5 to 24.9 kg/m²** is typically considered **normal weight**. - A BMI between 18 and 20 falls within the **healthy weight category**, not overweight. *15-18* - A BMI between **15.0 and 18.4 kg/m²** is classified as **underweight**. - This low range can indicate health risks like **malnutrition** and weakened immune function. *None of the options* - This option is incorrect because **25 to 29.99** accurately represents the BMI range for overweight classification. - The other provided ranges are for underweight or normal weight classifications.
Question 7: 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 8: A patient scheduled for elective inguinal hernia surgery has a history of myocardial infarction (MI) and underwent coronary artery bypass grafting (CABG). What should be included in the preoperative assessment?
- A. History + c/e + routine labs + V/Q scan
- B. History + c/e + routine labs
- C. History + c/e + routine labs + stress test (Correct Answer)
- D. History + c/e + routine labs + angiography to assess graft patency
Explanation: ***History + c/e + routine labs + stress test*** - A **stress test** is crucial in patients with a history of MI and CABG to assess **myocardial ischemia** and functional capacity, guiding perioperative management. - This evaluation helps determine the patient's **cardiac risk** for non-cardiac surgery and the need for further cardiac optimization. *History + c/e + routine labs + angiography to assess graft patency* - **Coronary angiography** is an invasive procedure and is generally not indicated as a routine preoperative assessment unless there are new, significant cardiac symptoms or signs of **graft dysfunction**. - Assessing graft patency through angiography carries risks and would only be justified if there were strong clinical indications suggesting acute or severe **cardiac ischemia**. *History + c/e + routine labs* - While critical for any preoperative assessment, **routine history, physical examination, and basic laboratory tests** are insufficient for a patient with a significant cardiac history like MI and CABG. - This approach would **underestimate the cardiac risk** and might miss undetected ischemia, leading to adverse perioperative cardiac events. *History + c/e + routine labs + V/Q scan* - A **ventilation-perfusion (V/Q) scan** is primarily used to diagnose **pulmonary embolism** or assess regional lung function. - It does not provide information about myocardial ischemia or cardiac functional capacity, making it **irrelevant** for assessing cardiac risk in this clinical scenario.
Question 9: Which of the following is true about Zenker's diverticulum?
- A. It is asymptomatic
- B. Occurs in the mid-esophagus
- C. It occurs in children
- D. Treatment options typically include surgical interventions such as diverticulectomy or cricopharyngeal myotomy. (Correct Answer)
Explanation: ***Correct Option D: Treatment options typically include surgical interventions such as diverticulectomy or cricopharyngeal myotomy*** - **Zenker's diverticulum** is a false diverticulum that usually requires **surgical intervention** due to its progressive nature and potential complications. - **Diverticulectomy** (surgical removal) and **cricopharyngeal myotomy** (cutting the cricopharyngeal muscle) reduce symptoms and prevent further food accumulation. - Other treatment modalities include **endoscopic stapling diverticulostomy** and **flexible endoscopic septum division**. *Incorrect Option A: It is asymptomatic* - **Zenker's diverticulum** is usually **symptomatic**, causing **dysphagia**, **regurgitation of undigested food**, and **halitosis**. - Symptoms often worsen over time as the diverticulum grows and retains more food particles. *Incorrect Option B: Occurs in the mid-esophagus* - **Zenker's diverticulum** is a **pharyngoesophageal diverticulum** that occurs in the posterior hypopharynx, specifically in **Killian's triangle**, above the upper esophageal sphincter. - Diverticula in the mid-esophagus are typically **traction diverticula**, which are true diverticula involving all layers of the esophageal wall. *Incorrect Option C: It occurs in children* - **Zenker's diverticulum** is rare in children and is primarily a condition of **older adults**, typically presenting after the age of 60. - It results from **cricopharyngeal muscle dysfunction** and increased intraluminal pressure over many years.
Question 10: Dohlman surgery in Zenker's diverticulum is:-
- A. Endoscopic electrocautery technique (Correct Answer)
- B. Endoscopic suturing of pouch
- C. Laser division of pouch
- D. Endoscopic stapling of septum
Explanation: ***Endoscopic electrocautery technique*** - The **Dohlman procedure** (Dohlman-Mattsson procedure, 1960) is an **endoscopic electrosurgical technique** that uses **diathermy/electrocautery** to divide the cricopharyngeal muscle (the septum between the esophagus and the diverticulum). - This method creates a common cavity between the esophagus and the diverticulum, allowing food to pass freely and preventing pooling. - It is one of the **classic endoscopic approaches** for treating Zenker's diverticulum and remains widely used. *Endoscopic suturing of pouch* - Endoscopic suturing is not the primary technique for the Dohlman procedure. - The goal is to **divide the septum**, not to suture or reduce the pouch itself. *Laser division of pouch* - **Laser division** of the cricopharyngeal muscle is another endoscopic approach, often called **endoscopic laser diverticulostomy**. - While effective, this is a **different technique** from the Dohlman procedure, which specifically uses electrocautery. *Endoscopic stapling of septum* - **Endoscopic stapling** (using an endoscopic stapler to divide the septum) is associated with the **Collard-Peracchia technique** or endoscopic stapling diverticulostomy. - While this is a modern and effective approach, it is **not the Dohlman procedure**, which historically and traditionally refers to the electrocautery technique.
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