A 54-year-old man comes to the physician because of generalized fatigue and numbness of his legs and toes for 5 months. He has hypertension and hypercholesterolemia. He underwent a partial gastrectomy for peptic ulcer disease 15 years ago. Current medications include amlodipine and atorvastatin. He is a painter. His temperature is 37°C (98.6°F), pulse is 101/min, respirations are 17/min, and blood pressure is 122/82 mm Hg. Examination shows conjunctival pallor and glossitis. Sensation to vibration and position is absent over the lower extremities. He has a broad-based gait. The patient sways when he stands with his feet together and closes his eyes. His hemoglobin concentration is 10.1 g/dL, leukocyte count is 4300/mm3, and platelet count is 110,000/mm3. Which of the following laboratory findings is most likely to be seen in this patient?

Elevated methylmalonic acid levels

Oligoclonal bands in cerebrospinal fluid

Positive rapid plasma reagin test

Basophilic stippling on peripheral smear

A 57-year-old woman presents to her primary care physician with a chief complaint of epigastric pain that has worsened over the past three weeks. She describes it as sudden “gnawing” sensations that last for up to half a minute before subsiding. She finds some relief after a glass of water, but does not associate relief or exacerbation around mealtimes. The patient denies any radiation of the pain, fever, weight loss, fatigue, or change in stool color and quality. She does not take any medications, and says her diet includes lots of spicy and smoked foods. The physician refers her for an upper endoscopy, which reveals evidence of duodenal ulcers and mild gastroesophageal reflux. The pathology report reveals focal intestinal metaplasia and gastric dysplasia in the stomach, but no Helicobacter pylori infection. How should the physician advise this patient?

Intestinal metaplasia may regress with treatment of underlying cause; gastric dysplasia requires monitoring and possible intervention.

Intestinal metaplasia and gastric dysplasia are best managed with acid suppression and repeat endoscopy.

Intestinal metaplasia requires no specific treatment, while gastric dysplasia requires immediate surgery.

Intestinal metaplasia and gastric dysplasia are irreversible and untreatable.

Both intestinal metaplasia and gastric dysplasia require endoscopic surveillance.

A 37-year-old man presents to the physician. He has been overweight since childhood. He has not succeeded in losing weight despite following different diet and exercise programs over the past several years. He has had diabetes mellitus for 2 years and severe gastroesophageal reflux disease for 9 years. His medications include metformin, aspirin, and pantoprazole. His blood pressure is 142/94 mm Hg, pulse is 76/min, and respiratory rate is 14/min. His BMI is 36.5 kg/m2. Laboratory studies show: Hemoglobin A1C 6.6% Serum Fasting glucose 132 mg/dL Which of the following is the most appropriate surgical management?

Laparoscopic Roux-en-Y gastric bypass

No surgical management at this time

Laparoscopic adjustable gastric banding

Biliopancreatic diversion and duodenal switch (BPD-DS)

Laparoscopic sleeve gastrectomy

A 69-year-old man is brought to the emergency department because of a 1-week history of recurring black stools. On questioning, he reports fatigue and loss of appetite over the last 3 months. Twenty years ago, he underwent a partial gastrectomy for peptic ulcer disease. The patient's father died of metastatic colon cancer at the age of 57 years. He is 163 cm (5 ft 4 in) tall and weighs 55 kg (121 lb); BMI is 20.8 kg/m2. He appears chronically ill. His temperature is 36.5°C (97.7°F), pulse is 105/min, and blood pressure is 115/70 mm Hg. The conjunctiva appear pale. Cardiopulmonary examination shows no abnormalities. The abdomen is soft and nontender. There is a well-healed scar on the upper abdomen. His hemoglobin concentration is 10.5 g/dL and his mean corpuscular volume is 101 μm3. An upper endoscopy shows a large nodular mass on the anterior wall of the lesser curvature of the gastric stump. Biopsy samples are obtained, showing polypoid, glandular formation of irregular-shaped and fused gastric cells with intraluminal mucus, demonstrating an infiltrative growth. Which of the following is the most appropriate next step in the management of this patient?

Stool antigen test for H. pylori

Treatment with PPI, clarithromycin, and amoxicillin

A 45-year-old man is brought to the emergency department because of severe abdominal pain for the past 2 hours. He has a 2-year history of burning epigastric pain that gets worse with meals. His pulse is 120/min, respirations are 22/min, and blood pressure is 60/40 mm Hg. Despite appropriate lifesaving measures, he dies. At autopsy, examination shows erosion of the right gastric artery. Perforation of an ulcer in which of the following locations most likely caused this patient's findings?

Lesser curvature of the stomach

Greater curvature of the stomach

Gastric surgery procedures for USMLE Step 1: High-Yield Surgery Lessons

🗺️ Anatomy - Stomach's Street Map

Arterial Supply of the Stomach

Arterial Supply (from Celiac Trunk):
- Lesser Curve: Left Gastric a. (from celiac) & Right Gastric a. (from proper hepatic).
- Greater Curve: Left Gastro-omental a. (from splenic) & Right Gastro-omental a. (from gastroduodenal).
- Fundus: Short Gastric aa. (from splenic).
Venous Drainage: Veins parallel arteries, draining into the Portal System.
Innervation:
- Parasympathetic: Vagus n. (Anterior & Posterior trunks).
- Sympathetic: Celiac plexus.
Lymphatics: Follow arteries; crucial for gastric cancer staging.

⭐ Surgical Pitfall: A posterior duodenal/gastric ulcer can erode into the gastroduodenal artery or splenic artery, respectively, causing massive hemorrhage. The pancreas lies posterior to the stomach.

✂️ The Gastric Nip/Tuck

Surgical procedures for peptic ulcer disease (PUD), malignancy, or bariatric goals.

Gastrectomy: Resection of the stomach.
- Partial (Antrectomy): Removes antrum; reduces gastrin production.
- Total: For extensive cancer (e.g., linitis plastica). Requires esophagojejunostomy.
Anastomosis Types (Post-Gastrectomy):
- Billroth I (Gastroduodenostomy): Stomach remnant attached to duodenum.
- Billroth II (Gastrojejunostomy): Stomach remnant attached to jejunum. Creates a blind duodenal (afferent) loop.
- Roux-en-Y: Used in bariatrics and cancer surgery. Creates a small gastric pouch anastomosed to a "Roux limb" of jejunum.

📌 Billroth I is 1 limb (duodenum). Billroth II has 2 limbs (duodenal stump + jejunal loop).

⭐ Dumping Syndrome: A common complication, especially after Billroth II & Roux-en-Y. Rapid emptying of hyperosmolar chyme into the small intestine causes fluid shifts, leading to hypotension, tachycardia, and diarrhea.

Billroth I and Billroth II gastric anastomoses

🔪 Management - The Bypass Blueprint

Roux-en-Y Gastric Bypass (RYGB): Gold standard bariatric procedure combining restriction & malabsorption.
Anatomy:
- A small gastric pouch (~30 mL) is created from the fundus.
- Stomach, duodenum, & proximal jejunum are bypassed.
- Roux limb (alimentary) connects to the pouch.
- Biliopancreatic limb carries digestive juices.
- Limbs join at the common channel for absorption.
Physiology: ↓ Ghrelin (hunger), ↑ GLP-1 & PYY (satiety).

Roux-en-Y Gastric Bypass: Anatomy Diagram

⭐ Key Complications & Deficiencies:

Dumping Syndrome: Rapid gastric emptying.

Nutritional: Iron, B12, Folate, Calcium, Vit D.

Surgical: Anastomotic leak/stenosis, marginal ulcers.

🚑 Complications - The Aftermath

Dumping Syndrome: Rapid emptying of hyperosmolar contents into small bowel.
- Early: 15-30 min post-meal. Osmotic fluid shift → hypovolemia, autonomic response (tachycardia, palpitations, diaphoresis, diarrhea).
- Late: 2-3 hrs post-meal. Rapid glucose spike → exaggerated insulin release → reactive hypoglycemia (dizziness, confusion).
Alkaline Reflux Gastritis: Bile reflux into stomach remnant → burning epigastric pain, N/V, unrelieved by vomiting.
Afferent Loop Syndrome (Billroth II): Obstruction of afferent limb → stasis, bacterial overgrowth → postprandial pain, bloating, relieved by projectile bilious vomiting.
Anemia:
- Iron deficiency (duodenum/proximal jejunum bypass).
- Vitamin B12 deficiency (loss of parietal cells → ↓intrinsic factor).

⭐ Post-gastrectomy, patients often require lifelong vitamin B12 injections and iron supplementation due to malabsorption.

⚡ Biggest Takeaways

Roux-en-Y Gastric Bypass (RYGB) is both malabsorptive and restrictive; monitor for iron, B12, folate, and calcium deficiencies.

Sleeve Gastrectomy is purely restrictive, removing the fundus and decreasing ghrelin production.

Dumping syndrome is a key post-gastrectomy complication due to rapid emptying of hyperosmolar contents.

Anastomotic leak is the most feared early complication; suspect with unexplained post-op tachycardia.

Vagotomy reduces acid but impairs motility, often requiring a drainage procedure like pyloroplasty.

Billroth II reconstruction carries a higher risk of dumping and afferent loop syndrome than Billroth I.

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