Short-bowel syndrome and intestinal failure

01OverviewDefinition, clinical context and the essential points that orientate the chapter.

Short-bowel physiology is defined by what remains, not only centimetres removed. Jejunum can adapt to some ileal functions, but terminal ileum uniquely recycles bile salts and absorbs B12. Colon in continuity ferments carbohydrate to absorbable short-chain fatty acids and conserves fluid. An end jejunostomy has no such rescue and can become a net secretor when output exceeds oral intake. Gastric hypersecretion is prominent early after major resection.

Intestinal failure is described by duration and context: type 1 is short-lived and often perioperative; type 2 is prolonged acute illness with sepsis, fistula or complex surgery; type 3 is chronic stable dependence on intravenous fluid or nutrition. Chronic care requires a multidisciplinary intestinal-failure service, specialist nurses, dietitians, pharmacists, surgeons and homecare support. Goals include independence, hydration, nutrition, line preservation, liver and kidney protection and possible restoration of continuity.

Home parenteral support is life-sustaining but creates catheter thrombosis, bloodstream infection, metabolic bone disease, renal injury and intestinal-failure-associated liver disease. Fever during infusion is an emergency, but automatic line removal can sacrifice access; management follows paired cultures and a catheter-salvage or removal protocol. Teduglutide, a GLP-2 analogue, may reduce parenteral requirements in selected stable adults under NICE TA804 and expert monitoring; it is not a substitute for foundational optimisation.

Key points

Intestinal failure means gut function is insufficient to absorb macronutrients, water or electrolytes so intravenous supplementation is needed; short bowel is one anatomical cause.
Record the length and segment of remaining small bowel, whether colon is in continuity, ileocaecal valve, stoma and fistulae because these predict fluid and nutritional behaviour.
A jejunostomy with high output loses sodium-rich fluid; drinking large volumes of plain water or hypotonic drink can increase net sodium and water loss.
Use a high-sodium glucose oral rehydration solution in measured amounts, restrict hypotonic fluid under specialist advice and separate ordinary hydration advice from this physiology.
Dehydration presents with thirst, cramps, postural symptoms, low urine, rising creatinine and magnesium depletion; chronic episodes can cause irreversible kidney disease.
Fever, rigors or collapse during home parenteral infusion is catheter-related bloodstream infection until assessed urgently with paired line and peripheral cultures.
The colon salvages water and carbohydrate but increases enteric hyperoxaluria and renal-stone risk when fat malabsorption delivers oxalate to the colon.
Adaptation occurs over months to years; optimise diet, antimotility and antisecretory therapy before judging permanent parenteral needs or considering teduglutide.

02AetiologyUnderlying causes, associations and risk factors, with why each one matters.

Extensive small-bowel resection

Mesenteric ischaemia, Crohn disease, volvulus, trauma and surgical complications can leave insufficient bowel length for fluid and nutrient autonomy.

Unfavourable remaining anatomy

Loss of ileum, ileocaecal valve or colon continuity increases bile-acid, fluid and sodium loss beyond what length alone predicts.

Functional intestinal failure

Severe dysmotility, fistulae, obstruction and radiation or mucosal disease can make anatomically present bowel unable to absorb adequately.

03PathophysiologyThe causal sequence from the underlying abnormality to symptoms and harm.

1
Reduced absorptive surface
Too little functioning mucosa remains to absorb macronutrients, micronutrients, water and electrolytes from ordinary intake without additional support.
2
Segment-specific losses
Jejunal stomas lose sodium-rich fluid, while ileal loss impairs bile-acid and vitamin B12 absorption and colon loss removes salvage capacity.
3
Adaptation and dependence
Remaining bowel gradually increases absorptive efficiency, but severe anatomical loss still requires intravenous fluid or nutrition to maintain health.

04Clinical features and red flagsSymptoms, examination findings, patterns of presentation and time-critical warnings.

High-output stoma dehydrationRed flag

Output commonly above 1.5 to 2 litres daily with thirst, dizziness, low urine, cramps, weight loss, rising urea or creatinine and hypomagnesaemia suggests net intestinal fluid loss.

Catheter bloodstream infectionRed flag

Rigors, fever, hypotension or confusion during or after infusion requires sepsis assessment, paired line and peripheral cultures and immediate intestinal-failure or infection contact.

Micronutrient and bone disease

Anaemia, neuropathy, bruising, night blindness, proximal weakness, fractures or poor wound healing can reflect B12, fat-soluble vitamin, mineral or trace-element deficiency.

Intestinal-failure liver disease

Progressive cholestatic tests, hepatomegaly or fibrosis risk during long-term parenteral nutrition requires review of sepsis, overfeeding, lipid exposure, oral intake and anatomy.

Mechanical cause of outputRed flag

Abruptly increased output with pain, fever, vomiting or inability to tolerate intake may represent infection, partial obstruction, recurrent disease or medication withdrawal rather than loss of adaptation.

05InvestigationsWhat to request, why it matters and how to interpret it.

Investigation order

Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.

01
Anatomical reconstructionFirst step
Why
Retrieve operative records and contrast or cross-sectional imaging to document residual jejunum and ileum, colon continuity, valve, stoma, fistula and strictures.
Interpretation and limitations
Anatomy predicts fluid versus energy failure and identifies reconstructive opportunities; reported bowel length without segment and continuity is incomplete.
02
Fluid balance and urine sodium
Why
Measure intake, stoma or fistula output, daily weight, urine volume and spot urine sodium according to the specialist protocol.
Interpretation and limitations
Low urine volume and sodium support sodium depletion even when serum sodium is normal. Oedema can coexist with intravascular depletion.
03
Biochemistry and nutrition panel
Why
Check renal function, sodium, potassium, magnesium, calcium, phosphate, liver profile, FBC, ferritin, B12, folate, INR, vitamin D and procedure-specific trace elements.
Interpretation and limitations
Trends and replacement exposure matter. Serum magnesium may underrepresent total depletion, and CRP affects trace-element interpretation.
04
Paired catheter and peripheral blood cultures
Why
Obtain correctly labelled simultaneous cultures before antibiotics when line sepsis is suspected without delaying treatment in shock.
Interpretation and limitations
Differential time to positivity can support catheter source; organism, tunnel infection, thrombosis and instability determine salvage versus removal.
05
Renal and hepatobiliary assessment
Why
Monitor eGFR, urine, stones and ultrasound or elastography when renal injury, cholestasis, gallstones or liver disease is plausible.
Interpretation and limitations
Recurrent dehydration, enteric hyperoxaluria, sepsis and parenteral formulation can produce progressive organ damage.
06
Parenteral prescription and absorption review
Why
Compare delivered energy, nitrogen, water, sodium and micronutrients with oral intake, output and body composition; assess candidacy for weaning or GLP-2 therapy.
Interpretation and limitations
Scale weight alone confounds fluid and tissue. Reduced bags are a benefit only if hydration, nutrition and renal function remain stable.

06Differential diagnosisRealistic alternatives and the features that help distinguish them.

Reversible high-output trigger

Infection, partial obstruction, active Crohn disease and medicine changes can acutely worsen output despite otherwise stable short-bowel anatomy.

Mucosal or pancreatic malabsorption

Coeliac disease and pancreatic insufficiency cause nutrient loss with preserved bowel length and have distinct serological, histological or pancreatic evidence.

Severe dysmotility

Dilated bowel, stasis and failure of propulsion without major resection suggests chronic intestinal pseudo-obstruction rather than anatomical short bowel.

07ManagementImmediate care, first-line treatment, alternatives and escalation.

01OutputHigh-output jejunostomyFirst stepStoma output rises with thirst, falling urine, weight loss or biochemical depletion.

1Exclude obstruction, infection, recurrent disease and medicine withdrawal, then measure 24-hour oral intake, output, urine and weight.
2Replace intravenous sodium and magnesium when clinically depleted, and use the specialist high-sodium oral rehydration plan while limiting hypotonic fluid.
3Give antimotility treatment before food and antisecretory treatment when indicated, titrating under ECG and intestinal-failure guidance.
4Review anatomy, diet, sodium balance and need for parenteral fluid at frequent intervals until stable.

02LineFever during home infusionA patient with a central venous catheter develops rigors, fever or instability during parenteral support.

1Use the sepsis pathway, stop the infusion safely, obtain paired catheter-lumen and peripheral cultures and contact the intestinal-failure team.
2Start local empirical antibiotics promptly for an unstable patient, covering likely line organisms and adjusting for prior microbiology.
3Use organism, tunnel or pocket infection, thrombosis, metastatic infection and haemodynamic state to decide line salvage, lock therapy or removal.
4Audit the episode and retrain connection technique where relevant while preserving future vascular access.

03ChronicReduce parenteral dependence safelyChronic short-bowel intestinal failure is clinically stable on an optimised regimen.

1Maximise oral diet, high-sodium fluid strategy, antimotility or antisecretory therapy and restore bowel continuity where feasible.
2Quantify stable parenteral needs and organ complications through a specialist intestinal-failure MDT.
3Consider teduglutide only when NICE eligibility and specialist safety screening are met, including neoplasia and obstruction review.
4Reduce parenteral volume gradually against urine, weight, electrolytes, renal function and nutrition rather than a predetermined target.

Key medicines and prescribing safety4 treatments · regimens, roles and cautions

Slows intestinal transit and reduces sodium and water loss without central opioid sedation.

High-dose loperamide

Specialist doses given 30 to 60 minutes before meals and at night may exceed routine licensed limits in intestinal failure; follow the current BIFA ECG and prescribing guidance.

High exposure can prolong QT and cause serious arrhythmia; obtain baseline and follow-up ECG as advised. Exclude obstruction and avoid casual over-the-counter escalation.

Reduces gastric secretion and high stoma output, especially early after major small-bowel resection.

Proton pump inhibitor

A current BNF oral or intravenous regimen selected for early gastric hypersecretion, absorption and ongoing output, then reviewed for continued need.

Long-term hypomagnesaemia, infection, bone and medicine-interaction concerns. Benefit diminishes after adaptation in some patients, so reassess.

Uses sodium-glucose cotransport to improve net water and sodium absorption in jejunostomy physiology.

Glucose-saline oral rehydration solution

Specialist recipe or licensed formulation providing about 90 mmol/L or more sodium, sipped in a prescribed daily volume while hypotonic drinks are limited.

Ordinary low-sodium sports drinks are inadequate. Cardiac or renal comorbidity and inaccurate home mixing require individual instruction.

GLP-2 analogue that increases intestinal absorption and can reduce parenteral support in selected adults with short-bowel syndrome.

Teduglutide

Once-daily specialist weight-based subcutaneous regimen under NICE TA804 and the current SmPC, with renal adjustment and response-led parenteral reduction.

Fluid overload, stoma obstruction, biliary or pancreatic disease and potential neoplastic growth require screening and surveillance; stopping can rapidly increase fluid needs.

08ComplicationsImportant consequences, why they occur and why they matter clinically.

Dehydration and renal injury

Repeated sodium-rich losses cause thirst, magnesium depletion, kidney stones and progressive renal impairment despite drinking large volumes of water.

Malnutrition and parenteral dependence

Energy, protein and micronutrient deficits cause sarcopenia and bone disease and may necessitate long-term home parenteral support.

Line sepsis and intestinal-failure liver disease

Central access creates bloodstream-infection and thrombosis risk, while prolonged parenteral nutrition and sepsis can cause cholestatic hepatic injury.

09Monitoring and follow-upTreatment response, safety checks and longer-term review.

Record stoma output, oral fluids, urine volume, weight and postural symptoms daily during instability and at an agreed interval when stable.
Check renal function, magnesium, potassium and sodium promptly after output or treatment changes and through chronic follow-up.
Use BIFA-guided periodic FBC, liver, bone and trace-element monitoring for home parenteral support.
Inspect the catheter and review infusion technique, fever episodes, thrombosis and line replacements to preserve venous access.
Assess liver tests, ultrasound or elastography and parenteral energy or lipid exposure for intestinal-failure liver disease.
During teduglutide, monitor fluid balance, obstruction symptoms, stoma anatomy and required gastrointestinal neoplasia surveillance.
Track quality of life, sleep, work, caregiver burden and goals alongside biochemical adequacy.

10Special situationsVariants, exceptions and circumstances that change the usual approach.

Serum sodium can look normal

Hormonal water conservation maintains the concentration while total body sodium and circulating volume are depleted; urine sodium and volume expose the deficit.

Plain water may worsen thirst

Hypotonic fluid entering a sodium-leaky jejunum can increase stomal sodium loss. High-sodium glucose solution changes the absorption gradient.

Colon is an energy organ

Colonic bacteria convert unabsorbed carbohydrate to short-chain fatty acids, reclaiming calories and fluid when colon remains in continuity.

Colon also increases oxalate risk

Unabsorbed fat binds calcium, leaving oxalate free for colonic uptake and calcium-oxalate renal stones.

A line is finite vascular capital

Evidence-led salvage can preserve access, but instability, tunnel infection and certain organisms make removal safer; the decision belongs to the specialist protocol.

11Common pitfallsFrequent interpretation and management errors.

01
Advising unrestricted plain water for a high-output jejunostomy.
02
Using serum sodium alone to exclude sodium depletion.
03
Escalating loperamide above licensed doses without ECG and specialist oversight.
04
Removing every suspected infected line before paired cultures and intestinal-failure discussion.
05
Reducing parenteral bags without monitoring urine and renal function.
06
Starting teduglutide without obstruction and neoplasia surveillance planning.