These OMS practice questions target physiology — including SBS, TPN, Short Bowel Syndrome, Total Parenteral Nutrition. The complete OMS deck holds 1020 flashcards, 100 of them dedicated to this topic. Study the free samples below, then unlock the whole collection for a one-time $7.
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A patient undergoes a total gastrectomy for gastric cancer. What is the primary physiological impact on Vitamin B12 absorption, and what is the necessary long-term intervention?
Show answer →Total gastrectomy removes parietal cells, the sole source of Intrinsic Factor (IF). IF is essential for the binding and subsequent absorption of Vitamin B12 in the terminal ileum. Without IF, B12 cannot be absorbed regardless of dietary intake. Intervention: Lifelong parenteral (IM) or high-dose sublingual B12 supplementation is required. NAWCO Exam Tip: Do not confuse the source of IF (stomach) with the site of absorption (ileum). Both must be functional for oral B12 to be effective.
A patient with a proximal jejunostomy presents with severe steatorrhea. If the duodenum was bypassed during surgery, how does this specifically impair fat digestion?
Show answer →The duodenum is the primary site where chyme mixes with bile salts and pancreatic lipase. Bypassing this segment prevents effective emulsification of fats into micelles. Micelle formation is a prerequisite for fat absorption in the jejunum. OMS Clinical Pearl: Patients with duodenal bypass often require pancreatic enzyme replacement therapy (PERT) and medium-chain triglycerides (MCTs), which are absorbed more easily without complex micelle formation.
During the creation of a jejunostomy, what anatomical landmark is used to identify the beginning of the jejunum, and why is its location significant for stoma function?
Show answer →The Ligament of Treitz (suspensory muscle of the duodenum) marks the formal transition from the duodenum to the jejunum. It is the point where the small bowel becomes intraperitoneal and mobile. Significance: Stomas placed closer to this ligament (more proximal) result in higher output and more aggressive effluent rich in digestive enzymes, increasing the risk for peristomal skin denudement and profound dehydration.
Following a Billroth II procedure, a patient experiences tachycardia, abdominal cramping, and diaphoresis 20 minutes after a high-carb meal. What is the physiological mechanism?
Show answer →This describes Early Dumping Syndrome. The loss of the pyloric sphincter allows hypertonic chyme to enter the small intestine rapidly. This creates an osmotic gradient, pulling fluid from the intravascular space into the intestinal lumen. The resulting bowel distension and hypovolemia trigger sympathetic nervous system activation. OMS Strategy: Recommend dry meals (fluids 30-60 mins after solids) and complex carbohydrates to slow transit and reduce ostomy output spikes.
In the context of Short Bowel Syndrome (SBS), what is the minimum functional length of the small intestine usually required for an adult to remain independent of Total Parenteral Nutrition (TPN)?
Show answer →While individual needs vary, the general clinical threshold is approximately 100 cm of functional small intestine if the colon is absent (end-stoma) or 60 cm if the colon is intact. NAWCO Focus: The presence of a functional ileocecal valve and colon significantly improves fluid and electrolyte reabsorption, potentially allowing for TPN independence with shorter small bowel lengths. 2026 guidelines emphasize the use of GLP-2 analogs (e.g., Teduglutide) to enhance mucosal hypertrophy in these patients.
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Try 30 free OMS cards firstThe full OMS deck contains 1020 flashcards, and 100 of them focus on physiology. This page shows 5 free samples.
Our OMS deck dedicates 100 of 1020 cards (10%) to physiology — always cross-check the official NAWCO exam outline for the current blueprint weighting.
Yes — the samples on this page are free, and the OMS preview page has 30 more free cards. Full access to all 1020 cards is a one-time $7.
Assessment
110 cards
Basics
60 cards
Diagnostics
20 cards
Management
400 cards
Pathology
160 cards
Procedures
160 cards
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