Disease Description (Causes and Symptoms)
- Summary of definition: A condition in which the absorptive length of the small intestine is greatly reduced, causing impaired digestion and absorption, followed by abnormalities in nutrition, hydration, and electrolytes.
- Main causes: Intestinal resection (surgical); Crohn’s disease, ischemic intestinal disease, intestinal twisting (volvulus), necrosis, congenital short bowel (in newborns), trauma, or tumors.
- Summary of pathophysiology: The length and sections of the remaining small intestine (especially whether the ileocecal valve is present) and whether the colon remains have a decisive effect on absorptive capacity and symptoms. Due to the reduced absorptive surface, absorption of calories, protein, lipids, fat-soluble vitamins (A, D, E, K), minerals (calcium, magnesium, zinc), and water and electrolytes decreases; small intestinal bacterial overgrowth (SIBO) and excessive gastric acid secretion may also occur. The remaining intestine attempts structural and functional adaptation over several weeks to several months.
- Main symptoms: Chronic diarrhea (persistent or fatty steatorrhea), weight loss, abdominal pain, malnutrition (edema of the skin, decreased muscle strength), anemia, growth delay (in children), and complications such as gallstones, kidney stones, and abnormal liver function.
Treatment Methods
- Acute and early stages (immediately after surgery)
- Fluid and electrolyte replacement and stabilization (intravenously); total parenteral nutrition (TPN) until intestinal function stabilizes.
- Use of acid-suppressing drugs (PPIs) in cases of excessive gastric acid.
- Nutritional therapy (core treatment)
- Initially, provide nutrition and fluids through TPN, then, to promote intestinal adaptation, combine enteral or oral nutrition in small amounts as soon as possible (intermittent small-volume feeding).
- Intestinal adaptation period (several weeks to several months): Gradually increase the proportion of oral/enteral intake and gradually reduce TPN.
- Nutritional adjustment: A diet high in protein and low in sugar, including medium-chain triglycerides (MCTs) when fat malabsorption is severe; maintain electrolyte and fluid balance and provide sufficient calories.
- Supplementation for deficiencies: Regular supplementation and monitoring of fat-soluble vitamins (A, D, E, K), water-soluble vitamins (B and C), calcium, magnesium, zinc, and others.
- Drug treatment
- Diarrhea control: Antidiarrheal drugs (such as loperamide); codeine and others if necessary (under a doctor’s direction).
- Bile acid-related diarrhea: Bile acid sequestrants such as cholestyramine (useful when the colon remains).
- Treatment of bacterial overgrowth: Antibiotics when intestinal bacterial overgrowth is suspected (e.g., short-term treatment with rifaximin, metronidazole, etc.).
- Surgical and procedural treatment
- Intestinal lengthening surgery (e.g., Bianchi procedure, STEP) — intended to improve adaptation in some patients.
- Small intestine transplantation: Considered in cases of long-term TPN failure or serious complications (worsening liver function, recurrent bloodstream infections, etc.).
- Prevention and management of complications
- TPN-related: Prevention of central venous catheter infections and monitoring for liver disease (biliary disease and cirrhosis).
- Prevention of stones and osteoporosis: Fluid management, calcium and vitamin D supplementation, and regular bone density testing.
- Lifestyle management
- Eat small meals frequently; follow a high-protein, low-sugar diet; adjust the type of fat (use MCTs); and consume sufficient fluids and electrolytes (oral rehydration solutions are recommended).
- Limit alcohol and smoking, and consult about medications (especially those that cause diarrhea).
Outpatient Visit Checklist (Including Items to Bring and Sample Questions)
- Items to bring (recommended)
- List of medications currently being taken (including nutritional supplements and vitamins)
- Previous surgical records (a copy of the operative report is helpful, including the resected section, length of the remaining intestine, and whether the ileocecal valve and colon are present)
- Recent records of weight changes and a food intake log (amount and frequency of meals)
- Recent test results (blood tests, liver function, electrolytes, vitamin levels, stool tests, etc.)
- Information on whether a catheter is being used (central venous catheter-related information)
- Symptoms/data to tell the doctor in advance during the outpatient visit
- The number and form of bowel movements per day (whether steatorrhea is present), urine volume, symptoms of dehydration (dizziness, low blood pressure), and fever or symptoms of infection.
- Duration of TPN use and any problems (infection, elevated liver enzyme levels, etc.).
- Sample questions (items the patient can ask the doctor directly during the outpatient visit)
- “How should the plan be adjusted based on my recent weight changes and frequency of diarrhea?”
- “Can I continue taking my current nutritional supplements and medications?”
- “Is the length of my remaining intestine and the presence or absence of the ileocecal valve known?”
Examples of General Questions to Ask the Doctor
- “Based on my current nutritional status (weight and blood test results), do I need to continue TPN, or can I switch to oral intake?”
- “What are the side effects and precautions for long-term use of my current medications (e.g., antidiarrheal drugs and antibiotics)?”
- “What tests should I undergo regularly (liver function, vitamins, electrolytes, bone density, etc.)?”
- “What lifestyle measures can reduce TPN-related infections or liver complications?”
Examples of Condition-Specific Questions
- “According to my surgical records, how long is my remaining small intestine, and are the ileocecal valve and colon still present? (This information affects the prognosis and treatment plan.)”
- “Based on my current diarrhea and nutritional status, when should we consider stopping TPN after intestinal adaptation or considering small intestine transplantation or intestinal lengthening surgery?”