CBC Bariatric Surgery and Procedures — Questions and Answers
Question 1: Which bariatric procedure involves removing approximately 80% of the stomach along the greater curvature, leaving a tubular pouch?
- Sleeve gastrectomy (Correct answer)
- Roux-en-Y gastric bypass
- Adjustable gastric banding
- Biliopancreatic diversion with duodenal switch
Correct answer: Sleeve gastrectomy
Sleeve gastrectomy removes about 80% of the stomach along the greater curvature, creating a banana-shaped tubular pouch.
Question 2: In Roux-en-Y gastric bypass, what is the approximate size of the newly created gastric pouch?
- About 15-30 mL (Correct answer)
- About 150-200 mL
- About 500 mL
- About 1 liter
Correct answer: About 15-30 mL
The Roux-en-Y gastric pouch is typically 15-30 mL, roughly the size of an egg, which sharply restricts intake.
Question 3: Which mechanism primarily explains why sleeve gastrectomy reduces hunger beyond simple restriction?
- Removal of the ghrelin-producing gastric fundus (Correct answer)
- Increased bile acid absorption in the colon
- Vagal nerve transection
- Slowed gastric emptying into the duodenum
Correct answer: Removal of the ghrelin-producing gastric fundus
The gastric fundus is the main site of ghrelin production, so its removal lowers levels of this hunger hormone.
Question 4: A patient with a BMI of 37 and type 2 diabetes asks whether they qualify for bariatric surgery under the 2022 ASMBS/IFSO guidelines. What is the most accurate response?
- Yes, surgery is recommended for BMI ≥35 regardless of comorbidities (Correct answer)
- No, surgery requires a BMI of at least 40
- Yes, but only after 10 years of failed dieting
- No, diabetes is a contraindication to surgery
Correct answer: Yes, surgery is recommended for BMI ≥35 regardless of comorbidities
The 2022 ASMBS/IFSO guidelines recommend bariatric surgery for BMI ≥35 regardless of comorbidities and consider it for BMI 30-34.9 with metabolic disease.
Question 5: Which bariatric procedure is fully reversible and involves no cutting or stapling of the stomach or intestines?
- Adjustable gastric banding (Correct answer)
- Sleeve gastrectomy
- Roux-en-Y gastric bypass
- Duodenal switch
Correct answer: Adjustable gastric banding
Adjustable gastric banding places a removable silicone band around the upper stomach without cutting or stapling, making it reversible.
Question 6: Which procedure combines a sleeve gastrectomy with a long intestinal bypass and produces the greatest average weight loss?
- Biliopancreatic diversion with duodenal switch (Correct answer)
- Roux-en-Y gastric bypass
- Adjustable gastric banding
- Intragastric balloon
Correct answer: Biliopancreatic diversion with duodenal switch
The duodenal switch pairs a sleeve gastrectomy with a substantial intestinal bypass, yielding the greatest weight loss but the highest malabsorption risk.
Question 7: Why is laparoscopic surgery generally preferred over open surgery for bariatric procedures?
- It reduces wound complications, pain, and recovery time (Correct answer)
- It eliminates the need for general anesthesia
- It allows more stomach tissue to be removed
- It guarantees no risk of internal bleeding
Correct answer: It reduces wound complications, pain, and recovery time
Laparoscopic approaches use small incisions, lowering wound complications, postoperative pain, and hospital stay compared with open surgery.
Question 8: Two weeks after gastric bypass, a patient reports dizziness, sweating, and cramping shortly after eating a sugary dessert. What is the most likely cause?
- Early dumping syndrome (Correct answer)
- Anastomotic leak
- Internal hernia
- Marginal ulcer
Correct answer: Early dumping syndrome
Early dumping syndrome occurs 15-30 minutes after eating high-sugar foods when hyperosmolar contents rapidly enter the small intestine.
Question 9: Which postoperative complication after bariatric surgery is a life-threatening emergency typically presenting with tachycardia, fever, and abdominal pain in the first week?
- Anastomotic or staple-line leak (Correct answer)
- Dumping syndrome
- Hair loss
- Lactose intolerance
Correct answer: Anastomotic or staple-line leak
A leak from the anastomosis or staple line allows gastric contents into the abdomen, and persistent tachycardia is often the earliest sign.
Question 10: A gastric bypass patient develops burning epigastric pain and is found to have an ulcer at the connection between the pouch and small intestine. Which behavior most increases this risk?
- Smoking and NSAID use (Correct answer)
- Drinking water between meals
- Eating slowly and chewing thoroughly
- Taking daily multivitamins
Correct answer: Smoking and NSAID use
Marginal ulcers at the gastrojejunal anastomosis are strongly associated with smoking and NSAID use, both of which impair mucosal healing.
Question 11: Years after Roux-en-Y gastric bypass, a patient presents with intermittent severe abdominal pain. Which delayed surgical complication should the counselor recognize as unique to bypass anatomy?
- Internal hernia through a mesenteric defect (Correct answer)
- Gallbladder polyps
- Hiatal hernia
- Appendicitis
Correct answer: Internal hernia through a mesenteric defect
Rerouted bowel in Roux-en-Y anatomy creates mesenteric defects through which intestine can herniate and twist, sometimes years later.
Question 12: Which complication is most specifically associated with adjustable gastric banding?
- Band slippage or erosion into the stomach (Correct answer)
- Dumping syndrome
- Severe protein malnutrition
- Bile reflux gastritis
Correct answer: Band slippage or erosion into the stomach
Gastric bands can slip out of position or erode through the stomach wall, which are leading reasons for band removal.
Question 13: A sleeve gastrectomy patient reports new or worsening heartburn after surgery. Why is this a recognized issue with this procedure?
- The high-pressure sleeve can worsen or cause gastroesophageal reflux (Correct answer)
- The sleeve removes the esophageal sphincter
- Bile is rerouted directly into the esophagus
- The procedure always causes hiatal hernia
Correct answer: The high-pressure sleeve can worsen or cause gastroesophageal reflux
The narrow, high-pressure sleeve can increase reflux, and severe GERD may require conversion to gastric bypass.
Question 14: Why does rapid weight loss after bariatric surgery increase the risk of gallstones?
- Rapid fat mobilization increases cholesterol saturation of bile (Correct answer)
- The gallbladder is always removed during surgery
- Bile production stops after surgery
- Vitamin supplementation dissolves gallstones
Correct answer: Rapid fat mobilization increases cholesterol saturation of bile
Rapid weight loss raises cholesterol concentration in bile and reduces gallbladder motility, promoting stone formation.
Question 15: Which vitamin deficiency is most critical to prevent after gastric bypass because the procedure bypasses the primary site of intrinsic factor-mediated absorption?
- Vitamin B12 (Correct answer)
- Vitamin C
- Vitamin K
- Biotin
Correct answer: Vitamin B12
Bypassing much of the stomach reduces intrinsic factor and acid needed for B12 absorption, so lifelong supplementation is required.
Question 16: A counselor advises a post-bypass patient on calcium supplementation. Which form is preferred and why?
- Calcium citrate, because it does not require stomach acid for absorption (Correct answer)
- Calcium carbonate, because it is cheaper
- Calcium oxalate, because it absorbs fastest
- No calcium is needed after surgery
Correct answer: Calcium citrate, because it does not require stomach acid for absorption
Calcium citrate is preferred after bariatric surgery because it absorbs well without stomach acid, unlike calcium carbonate.
Question 17: Which eating guideline is standard during the first weeks after bariatric surgery?
- Progress gradually from clear liquids to pureed foods to soft foods (Correct answer)
- Resume regular solid foods within 48 hours
- Eat three large meals daily to stretch the pouch
- Drink large amounts of fluid with every meal
Correct answer: Progress gradually from clear liquids to pureed foods to soft foods
Patients advance through staged textures — clear liquids, full liquids, purees, then soft foods — to protect the healing pouch.
Question 18: Why are patients told to avoid drinking fluids within 30 minutes of meals after bariatric surgery?
- Fluids can flush food through the pouch, reducing satiety and risking discomfort (Correct answer)
- Water dilutes stomach acid needed for protein digestion
- Fluids cause staple-line leaks
- Drinking with meals causes vitamin toxicity
Correct answer: Fluids can flush food through the pouch, reducing satiety and risking discomfort
Drinking with meals washes food rapidly through the small pouch, reducing fullness and potentially causing dumping or overeating.
Question 19: What daily protein intake is generally recommended for adults after bariatric surgery to preserve lean body mass?
- At least 60-80 grams per day (Correct answer)
- 10-20 grams per day
- 200-250 grams per day
- Protein intake is unrestricted and unmonitored
Correct answer: At least 60-80 grams per day
Most guidelines recommend a minimum of 60-80 grams of protein daily after bariatric surgery to prevent muscle loss.
Question 20: A post-surgical patient develops confusion, unsteady gait, and eye movement abnormalities after weeks of persistent vomiting. Which deficiency must be treated urgently?
- Thiamine (vitamin B1) (Correct answer)
- Vitamin D
- Iron
- Zinc
Correct answer: Thiamine (vitamin B1)
Persistent vomiting can deplete thiamine within weeks, causing Wernicke encephalopathy, which requires immediate thiamine replacement.
Question 21: Which patients after bariatric surgery are at greatest risk of iron deficiency anemia?
- Menstruating women after gastric bypass (Correct answer)
- Older men after gastric banding
- Patients taking calcium citrate
- Patients who eat red meat daily
Correct answer: Menstruating women after gastric bypass
Menstruating women lose iron regularly, and bypass reduces acid and duodenal absorption, compounding their deficiency risk.
CBC Bariatric Surgery and Procedures
Which bariatric procedure involves removing approximately 80% of the stomach along the greater curvature, leaving a tubular pouch?
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