Gastroschisis

1. Clinical Overview

Summary

Gastroschisis is a congenital abdominal wall defect characterised by herniation of abdominal viscera through a full-thickness paraumbilical defect, almost always to the RIGHT of the umbilical cord insertion. Unlike exomphalos (omphalocele), there is NO covering membrane - the bowel is directly exposed to amniotic fluid, resulting in characteristic inflammatory changes termed the "bowel peel". [1,2]

The condition represents a surgical emergency requiring immediate stabilisation at birth, with outcomes heavily dependent on prompt recognition and appropriate initial management to prevent hypothermia, dehydration, and bowel compromise. [3]

Key Facts

Clinical Pearls

• "GAST-right-schisis": Mnemonic - Gastroschisis is to the RIGHT, exomphalos is central
• No sac = Gastroschisis: The absence of a peritoneal covering membrane is pathognomonic
• Young mothers: Strong association with maternal age less than 20 years, smoking, and recreational drug use
• Bowel peel: Inflammatory thickening from prolonged amniotic fluid exposure causes oedema and "matted" appearance
• Intestinal atresia: Present in 10-15% - look for discontinuity or dilated proximal bowel at birth
• Cling film first: Immediate wrapping in sterile cling film prevents catastrophic heat and fluid loss
• Lateral positioning: Prevents vascular compromise of mesenteric vessels

Exam Detail: MRCPCH High-Yield Points:

• Differentiation from exomphalos is a common question
• Understand the embryological basis (vascular disruption vs failed closure)
• Know immediate delivery room management steps in sequence
• Be able to discuss silo vs primary closure decision-making
• Recognise that TPN duration is proportional to bowel damage severity
• Understand risk stratification: simple vs complex gastroschisis

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2. Epidemiology

Incidence & Demographics

Exam Detail: Epidemiological Puzzle: The rising incidence of gastroschisis is incompletely understood. Unlike many congenital anomalies that have decreased with folic acid supplementation and improved prenatal care, gastroschisis rates have paradoxically increased. Proposed contributors include:

• Increased maternal smoking and drug use in young women
• Environmental toxin exposure
• Vasoactive medication use (aspirin, pseudoephedrine)
• Changes in sexual behaviour and young pregnancy rates
• Reporting bias and improved detection

This makes gastroschisis epidemiologically unique and a topic of ongoing research. [5,6]

Risk Factors

Clinical Pearl: Counselling Point: It is important to emphasise to parents that gastroschisis is NOT caused by anything they did or didn't do during pregnancy. While associations exist (smoking, drugs), the defect occurs very early (weeks 4-6) before most women know they are pregnant. Avoid blame and focus on supportive, evidence-based care.

Geographic and Temporal Trends

The incidence of gastroschisis has shown a marked increase globally over the past 2-3 decades, particularly in developed nations. This contrasts with other congenital anomalies which have remained stable or decreased. [5]

Key observations:

• Incidence doubled in the UK between 1987-2007
• Similar trends in USA, Australia, and parts of Europe
• May be plateauing in recent years in some regions
• Developing countries report lower rates (may reflect ascertainment bias)

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3. Aetiology & Pathophysiology

Embryological Basis

Exam Detail: Normal Gut Development: During weeks 6-10 of gestation, the midgut undergoes physiological herniation into the umbilical cord to accommodate rapid intestinal growth. By week 10-12, the intestines return to the abdominal cavity and the abdominal wall closes around the umbilicus.

Gastroschisis Pathogenesis: The exact aetiology remains debated, but the vascular disruption hypothesis is most widely accepted. [10,11]

Vascular Disruption Hypothesis

The leading theory proposes that gastroschisis results from disruption of the right omphalomesenteric artery during early embryonic development (weeks 4-6). [10]

Normal Development          Gastroschisis Development
─────────────────          ─────────────────────────
Omphalomesenteric          RIGHT omphalomesenteric
arteries intact            artery disrupted/involutes abnormally
       ↓                           ↓
Normal abdominal           Focal ischaemia of right
wall development           paraumbilical region
       ↓                           ↓
Physiological gut          Defect in abdominal wall
herniation & return        (usually to RIGHT of umbilicus)
       ↓                           ↓
Intact abdominal           Bowel herniates through defect
wall at birth              WITHOUT peritoneal covering

Key supporting evidence:

• Defect is almost always RIGHT of umbilicus (90-95%)
• Timing corresponds to omphalomesenteric artery involution
• Association with vasoactive substances (smoking, drugs)
• Histological studies show vascular disruption patterns

Alternative Theories

Bowel Damage in Utero

Once the bowel herniates through the defect, it is exposed to amniotic fluid for the remainder of gestation. This prolonged exposure causes progressive damage. [12]

Pathological Changes

Exam Detail: Simple vs Complex Gastroschisis:

This classification has significant prognostic implications. [14]

Simple Gastroschisis (70-80%):

• Uncomplicated defect
• No intestinal atresia
• No bowel necrosis/perforation
• Better prognosis
• Shorter hospital stay
• Faster time to full feeds

Complex Gastroschisis (20-30%):

• Intestinal atresia present
• Bowel necrosis/perforation
• Volvulus
• Significantly worse prognosis
• Prolonged hospitalisation (median 2x longer)
• Risk of short bowel syndrome
• May require multiple operations

MRCPCH Pearl: The presence or absence of intestinal atresia is the single most important prognostic factor. [14]

Factors Influencing Bowel Damage Severity

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4. Antenatal Diagnosis & Management

Antenatal Detection

Gastroschisis is now detected antenatally in > 90% of cases in developed countries with routine anomaly scanning. [16]

Ultrasound Features

Optimal timing:

• First detected at 18-20 week anomaly scan
• Earlier detection possible (14-16 weeks) with high-resolution ultrasound
• Diagnosis reliable from mid-second trimester

Antenatal Prognostic Markers

Serial ultrasound can identify features associated with complex gastroschisis: [17]

Clinical Pearl: Intra- vs Extra-abdominal Bowel Dilation:

• Intra-abdominal dilation has higher specificity for atresia (suggests proximal obstruction)
• Extra-abdominal dilation is less specific but still concerning
• Serial scans showing progressive dilation are more worrying than static findings

Antenatal Counselling

Parents should receive detailed counselling from a multidisciplinary team:

Team composition:

• Maternal-fetal medicine specialist
• Paediatric surgeon
• Neonatologist
• Specialist midwife/nurse
• Clinical geneticist (if other anomalies detected)

Key counselling points:

1. Diagnosis confirmation and differentiation from exomphalos
2. Associated anomalies are uncommon (5-15%)
3. Chromosomal abnormalities are rare (less than 1%) - amniocentesis usually NOT indicated
4. Prognosis is generally excellent (> 90% survival)
5. Antenatal complications - intrauterine growth restriction (30-40%)
6. Delivery planning - timing and location
7. Postnatal management - surgery, feeding delay, hospital stay
8. Long-term outcomes - most children develop normally

Antenatal Monitoring

Delivery Planning

Evidence Debate: Timing of Delivery:

This is one of the most debated aspects of gastroschisis management. [15,19]

Arguments for EARLY delivery (36-37 weeks):

• Reduces duration of amniotic fluid exposure
• May reduce bowel damage severity
• Some (not all) studies show improved outcomes

Arguments for AWAITING SPONTANEOUS LABOUR:

• Avoids prematurity complications
• No definitive evidence of benefit from early delivery
• Large RCTs have not shown clear advantage

Current Evidence:

• Cochrane review (2017) found insufficient evidence to support routine early delivery [19]
• UK practice varies: some centres deliver 36-37 weeks, others await spontaneous labour
• Individualised approach based on fetal wellbeing and antenatal markers

Emerging consensus:

• If uncomplicated: consider delivery 37-38 weeks
• If complex features (bowel dilation, IUGR): may justify earlier delivery
• Definitive evidence awaited from ongoing trials

Mode of delivery:

• Vaginal delivery is preferred unless obstetric indications for caesarean section
• No evidence that caesarean section improves outcomes [20]
• Gastroschisis itself is NOT an indication for caesarean section

Location of delivery:

• Tertiary centre with paediatric surgical facilities
• Immediate access to neonatal intensive care
• Paediatric surgical team on-site
• Transfer in utero if diagnosed at non-specialist centre

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5. Clinical Presentation

At Birth - Immediate Findings

Gastroschisis vs Exomphalos - Critical Differentiation

This is a classic exam question and critical for immediate management. [1,2]

Exam Detail: MRCPCH Viva Question: "You are called to attend a delivery where an abdominal wall defect has been detected antenatally. When you arrive, you see bowel protruding from the infant's abdomen. How do you differentiate gastroschisis from exomphalos, and why does this matter?"

Model Answer: "I would systematically assess:

1. Location - is the defect to the right of the umbilicus (gastroschisis) or central/into the cord (exomphalos)?
2. Covering - is there a membrane covering the bowel? No membrane = gastroschisis
3. Cord insertion - normal insertion suggests gastroschisis; insertion into sac suggests exomphalos
4. Bowel appearance - matted, thickened bowel suggests gastroschisis

This differentiation matters because:

• Gastroschisis is a surgical emergency requiring immediate wrapping and fluid resuscitation due to exposed bowel
• Exomphalos with intact sac is less urgent; the priority is protecting the sac and screening for associated anomalies (cardiac, chromosomal) which are present in 50-70% of cases
• Management pathways differ significantly"

Associated Anomalies in Gastroschisis

Unlike exomphalos, gastroschisis is typically an isolated defect. [1]

Clinical Pearl: Intestinal Atresia in Gastroschisis: This is NOT a "associated anomaly" in the traditional sense - it is a complication of gastroschisis occurring in utero (volvulus, vascular accident). It defines "complex gastroschisis" and is the most important prognostic factor. [13,14]

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6. Initial Assessment & Stabilisation

Delivery Room Management (Golden Hour)

Immediate management is critical to prevent life-threatening complications. [3,21]

Initial Steps (First 5 Minutes)

Clinical Pearl: Cling Film Technique:

• Wrap the bowel loosely in several layers of sterile cling film
• Keep the bowel moist - do NOT let it dry out
• Use clear/transparent wrapping to allow ongoing assessment of bowel colour
• The bowel should be visible at all times to detect ischaemia

Common Error: Using gauze soaked in saline. This is OUTDATED practice:

• Gauze adheres to damaged serosa
• Cools the bowel (evaporative heat loss)
• Obscures visualisation
• Increases infection risk

Fluid Management

Gastroschisis causes massive fluid losses through multiple mechanisms: [21]

Initial fluid regimen:

• First 24 hours: 150-200 mL/kg/day (vs 60-80 mL/kg/day for normal neonate)
• Fluid type: 0.9% saline or Hartmann's initially
• Add dextrose: 10% dextrose to maintain glucose 4-7 mmol/L
• Electrolyte monitoring: U&Es 6-hourly initially
• Urine output: Aim for 1-2 mL/kg/hour (indicates adequate resuscitation)

Haemodynamic Monitoring

Assessment of Bowel Viability

This must be performed repeatedly until surgical closure:

Investigations

Baseline Investigations (Within 1 Hour)

Imaging

Exam Detail: Abdominal X-ray Features Suggesting Intestinal Atresia:

• Dilated bowel loops (> 2.5 cm diameter)
• Multiple air-fluid levels
• Paucity of gas in distal bowel
• "Double bubble" (duodenal atresia)
• Persistent gastric dilation despite NG decompression

Sensitivity is limited as bowel is outside the abdomen, so clinical assessment at surgery is definitive. [13]

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7. Surgical Management

Timing of Surgery

Gastroschisis is a surgical emergency but NOT a "rush-to-theatre" scenario. [3,22]

Surgical Options: Primary Closure vs Staged Reduction

The choice depends on defect size, bowel oedema, and abdominal domain. [22,23]

Exam Detail: #### Primary Closure

Indications:

• Small defect (less than 4 cm)
• Minimal bowel oedema
• Adequate abdominal domain (bowel can be accommodated without tension)
• Good bowel viability

Technique:

1. Reduction of bowel into abdominal cavity
2. Primary fascial closure ± skin closure
3. May require stretching of abdominal wall (manual or temporary)

Advantages:

• Single operation
• Shorter hospital stay
• Earlier enteral feeding
• Lower infection risk

Disadvantages:

• Risk of abdominal compartment syndrome if closure too tight
• Respiratory compromise (elevated diaphragm)
• Mesenteric vascular compromise

Critical monitoring post-primary closure:

• Intra-abdominal pressure (bladder pressure monitoring)
• Respiratory function (ventilatory pressures)
• Lower limb perfusion
• Urine output (renal perfusion)
• Lactate (bowel ischaemia)

Abdominal compartment syndrome (bladder pressure > 20 mmHg):

• Respiratory failure (cannot ventilate)
• Renal failure (oliguria/anuria)
• Bowel ischaemia (rising lactate)
• Management: Urgent re-opening of abdomen

Staged Reduction with Silo

Indications:

• Large defect (> 4 cm)
• Significant bowel oedema
• Insufficient abdominal domain
• "Matted" bowel difficult to reduce
• Liver herniation (rare in gastroschisis)

Technique - Spring-Loaded Silo:

1. Pre-formed silo applied at bedside (no anaesthesia required)
2. Spring-loaded device secures around defect
3. Bowel contained in transparent silo bag
4. Serial reduction over 5-10 days:
   • Gravity allows gradual reduction
   • Manual "milking" of bowel into abdomen
   • Silo tied progressively lower
5. Definitive closure once bowel accommodated (operating theatre)

Advantages:

• Avoids abdominal compartment syndrome
• Allows bowel oedema to resolve
• Can be initiated at bedside without general anaesthesia
• Transparent silo allows continuous bowel monitoring

Disadvantages:

• Prolonged exposure (infection risk)
• Requires intensive nursing care
• Multiple procedures (silo application, reductions, definitive closure)
• Longer hospital stay

Silo Reduction Protocol (Typical):

Day 0:   Silo applied, bowel suspended
Day 1-2: Initial reduction (1-2 cm)
Day 3-5: Daily reductions (1-2 cm per day)
Day 5-7: Majority of bowel reduced
Day 7-10: Definitive closure in operating theatre

Decision-Making Algorithm

Gastroschisis at Birth
         ↓
   Stabilisation
   (Fluids, Wrapping, NG tube)
         ↓
   Surgical Assessment
         ↓
    ┌────┴────┐
    ↓         ↓
Small Defect  Large Defect
Minimal       Significant
Oedema        Oedema
    ↓              ↓
Attempt        Apply Silo
Primary        (Staged)
Closure            ↓
    ↓         Serial Reduction
    ↓         over 5-10 days
    ↓              ↓
    └────→ Definitive Closure
              ↓
         Post-operative Care
         (TPN, Gradual Feeding)

Intraoperative Findings & Additional Procedures

Clinical Pearl: "Complex Gastroschisis" Defined at Surgery: Presence of:

• Intestinal atresia
• Perforation
• Necrosis requiring resection
• Volvulus

This is the most important prognostic factor and dictates long-term outcomes. [14]

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8. Postoperative Care

Immediate Postoperative Management

All infants require neonatal intensive care following gastroschisis repair. [24]

Total Parenteral Nutrition (TPN)

TPN is essential as gastroschisis is associated with prolonged intestinal dysmotility. [24,25]

TPN-related complications:

• Cholestasis (20-40%): Monitor conjugated bilirubin; consider ursodeoxycholic acid
• Line sepsis (10-20%): High index of suspicion; strict aseptic technique
• Thrombosis (5-10%): PICC-related; may lose venous access
• Metabolic disturbances: Hyper/hypoglycaemia, electrolyte imbalances

Enteral Feeding Strategy

This is the most challenging aspect of gastroschisis management. [25,26]

Timeline (Typical for Simple Gastroschisis)

Day 0-7:   Nil by mouth
           ↓ (when NG aspirates reduce to less than 5 mL/kg/day)
Day 7-14:  Trophic feeds started (1-2 mL/hour)
           Breast milk or specialist formula
           ↓ (if tolerated - no vomiting, aspirates remain low)
Day 14-21: Gradual increase (10-20% per day)
           ↓
Day 21-35: Approach full enteral feeds
           ↓ (when tolerating 120-150 mL/kg/day)
Day 35+:   Wean TPN, establish full enteral nutrition

Feeding Protocol

Signs of Feed Intolerance

Clinical Pearl: Breast Milk is Best:

• Expressed breast milk (EBM) is preferred over formula
• Lower NEC risk
• Better tolerance in dysmotile gut
• Immunological benefits

Specialist Formulas:

• Extensively hydrolysed or amino acid-based formulas sometimes used
• No definitive evidence of superiority over standard formula
• Consider if persistent feed intolerance

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9. Complications

Early Complications (First 2 Weeks)

Intermediate Complications (Weeks 2-6)

Exam Detail: Necrotising Enterocolitis (NEC) in Gastroschisis:

NEC risk is significantly increased in gastroschisis (6-20%) compared to general NICU population (2-5%). [27]

Proposed mechanisms:

• Prolonged bowel ischaemia (in utero and perioperative)
• Delayed enteral feeding
• Intestinal dysmotility
• Bacterial translocation

Clinical features:

• Abdominal distension
• Bloody stools (cardinal feature)
• Feed intolerance (bilious aspirates/vomiting)
• Systemic signs (temperature instability, apnoea, bradycardia)
• Thrombocytopenia
• Metabolic acidosis

Diagnosis:

• Abdominal X-ray: Dilated loops, pneumatosis intestinalis, portal venous gas, pneumoperitoneum
• Blood tests: Thrombocytopenia, CRP elevated, acidosis

Management:

• STOP FEEDS immediately
• IV fluids for resuscitation
• Broad-spectrum antibiotics (gentamicin, amoxicillin, metronidazole)
• Serial abdominal examinations and X-rays
• Surgical intervention if perforation (pneumoperitoneum) or clinical deterioration

Prognosis:

• Medical NEC (no perforation): Good outcome with supportive care
• Surgical NEC (perforation): Higher mortality and morbidity; risk of short bowel syndrome

Late Complications (Months to Years)

Clinical Pearl: Adhesive Small Bowel Obstruction:

• This is a lifelong risk following gastroschisis repair
• Parents should be counselled at discharge
• Symptoms: Bilious vomiting, abdominal pain, distension, constipation
• First-line: Conservative management (NG decompression, IV fluids)
• Surgery if: Fails to resolve, signs of bowel ischaemia, complete obstruction

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10. Prognosis & Long-Term Outcomes

Survival

Hospital Stay

Time to Full Enteral Feeds

Long-Term Quality of Life

The majority of children with gastroschisis have excellent long-term outcomes. [29,30]

Exam Detail: Factors Predicting Poor Outcome:

Predictive Models: Several scoring systems exist to predict outcomes (e.g., bowel dilation on antenatal ultrasound), but none are universally adopted in clinical practice. Individual patient factors must be considered. [17]

Follow-Up

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11. Examination Focus - MRCPCH Viva Questions

Exam Detail: ### Question 1: Differentiation from Exomphalos

Examiner: "You are called to attend a delivery where an abdominal wall defect has been detected antenatally. Describe how you would differentiate gastroschisis from exomphalos and outline the key management differences."

Model Answer:

"I would assess the infant systematically:

Differentiation:

1. Location: Gastroschisis is to the RIGHT of the umbilicus; exomphalos is central/into the cord
2. Covering: Gastroschisis has NO membrane; exomphalos has a peritoneal sac
3. Cord insertion: Normal in gastroschisis; into the sac in exomphalos
4. Bowel appearance: Matted/thickened in gastroschisis; normal in exomphalos (if sac intact)
5. Associated anomalies: Rare in gastroschisis (5-15%); common in exomphalos (50-70%)

Management Differences:

Gastroschisis:

• Wrap bowel in sterile cling film immediately
• Aggressive fluid resuscitation (150-200 mL/kg/day)
• Urgent surgical closure (within 6-12 hours)
• Low priority for genetic screening

Exomphalos:

• Protect the sac with saline-soaked gauze and cling film
• Normal fluid requirements (unless sac ruptured)
• Surgery may be delayed (especially giant omphalocele)
• HIGH priority for screening: echo (cardiac anomalies 20-40%), chromosomal analysis (30-40% risk of trisomies)

The key is that gastroschisis is an isolated surgical emergency, whereas exomphalos is often part of a syndrome requiring thorough investigation before surgery."

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Question 2: Complex Gastroschisis

Examiner: "What is 'complex gastroschisis' and why is this classification clinically important?"

Model Answer:

"Complex gastroschisis is defined by the presence of intestinal complications at birth:

• Intestinal atresia (most common)
• Bowel perforation
• Necrosis requiring resection
• Volvulus

This classification is clinically important because it is the single most important prognostic factor in gastroschisis.

Impact on outcomes:

• Hospital stay: 2-3x longer (median 6-12 weeks vs 3-4 weeks)
• Time to full feeds: 2-3x longer
• Complications: Higher rates of sepsis, NEC, short bowel syndrome
• Survival: Slightly reduced (75-85% vs > 95%)
• Long-term: Risk of short bowel syndrome if extensive resection

Antenatal prediction: We can attempt to identify complex gastroschisis antenatally using serial ultrasound:

• Intra-abdominal bowel dilation (40-60% PPV for atresia)
• Extra-abdominal bowel dilation
• Polyhydramnios

However, definitive diagnosis is made at surgery.

Management implications:

• Longer TPN duration anticipated
• Need for bowel resection ± stoma formation
• More cautious feeding advancement
• Family counselling about prolonged hospital stay and potential long-term complications"

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Question 3: Immediate Delivery Room Management

Examiner: "You are the neonatal registrar attending a delivery of an infant with known gastroschisis. Talk me through your immediate management in the first 30 minutes."

Model Answer:

"I would follow a structured approach:

Immediate (First 5 minutes):

1. Airway and breathing: Assess respiratory effort; provide support if needed
2. Prevent heat loss: Place infant in plastic bag up to axilla; radiant warmer on
3. Wrap exposed bowel: Sterile cling film (NOT gauze) to prevent evaporative losses and allow visualisation
4. Position: Right lateral or supine with bowel supported to prevent mesenteric vessel kinking
5. NG tube: Large bore (8-10 Fr), free drainage to decompress bowel
6. IV access: Two peripheral cannulae or UVC
7. Fluid resuscitation: 10-20 mL/kg bolus 0.9% saline, then 150-200 mL/kg/day maintenance

Assessment (First 30 minutes):

• Bowel viability: Colour (pink = viable; dusky/black = ischaemia)
• Defect size: Estimate feasibility of primary closure
• Associated anomalies: Examine for other defects (though rare)

Investigations:

• Blood gas (metabolic status, lactate)
• Blood glucose
• FBC, U&Es, coagulation
• Group & Save

Communication:

• Inform paediatric surgical team
• Update parents
• Transfer to NICU

Critical errors to avoid:

• Using dry gauze (damages serosa, obscures visualisation)
• Inadequate fluid resuscitation (causes shock)
• Attempting to reduce bowel (wait for surgical team)
• Letting bowel dry out or cool down"

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Question 4: Feeding Strategy

Examiner: "A 2-week-old infant has undergone uncomplicated primary closure of gastroschisis. The NG aspirates have reduced to minimal. How would you approach enteral feeding?"

Model Answer:

"Gastroschisis is associated with prolonged intestinal dysmotility due to in utero bowel damage, so feeding must be cautious and incremental.

Pre-feeding assessment:

• NG aspirates less than 5 mL/kg/day
• Soft, non-distended abdomen
• Bowel sounds present (not essential)
• Passing meconium/stool
• Clinically well (no sepsis)

Feeding strategy:

1. Start trophic feeds: 1-2 mL/hour continuous NG
   • Expressed breast milk preferred (lower NEC risk)
   • Continue TPN for full nutrition
2. Monitor tolerance:
   • Aspirate NG 4-6 hourly
   • Abdominal examination 8-12 hourly
   • Watch for distension, blood in stool, systemic upset
3. Gradual advancement: If tolerating, increase by 10-20% per day
   • No fixed rule; titrate to individual response
4. Transition to bolus feeds: Once reaching 20-30 mL/hour continuous
   • Switch to 3-hourly boluses
5. Full feeds: Aim for 150-180 mL/kg/day
   • Wean TPN as enteral feeds increase
6. Discharge planning: Establish oral feeding or NG top-ups

Red flags (STOP FEEDS):

• Bilious aspirates/vomiting (obstruction/NEC)
• Abdominal distension (ileus/NEC)
• Blood in stool (NEC)
• Systemic upset (sepsis/NEC)

Timeline:

• Median time to full feeds: 3-4 weeks (uncomplicated)
• Complex gastroschisis: 6-12 weeks
• Patience is key - rushing feeds increases NEC risk"

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Question 5: Complications

Examiner: "What are the major complications of gastroschisis and how would you recognise and manage necrotising enterocolitis in this context?"

Model Answer:

"Major complications of gastroschisis:

Early:

• Abdominal compartment syndrome (post-primary closure)
• Bowel ischaemia/necrosis
• Sepsis (exposed bowel, central lines)
• Wound dehiscence

Intermediate:

• Necrotising enterocolitis (6-20% - significantly higher than general NICU)
• Prolonged ileus/feed intolerance
• TPN cholestasis
• Nosocomial infections

Late:

• Adhesive small bowel obstruction (10-20% lifetime risk)
• Short bowel syndrome (if extensive resection)
• Gastro-oesophageal reflux
• Failure to thrive

Necrotising Enterocolitis (NEC) in Gastroschisis:

Why increased risk?

• Prolonged bowel ischaemia (in utero and perioperative)
• Delayed enteral feeding
• Intestinal dysmotility
• Bacterial translocation

Clinical presentation:

• Cardinal feature: Bloody stools
• Abdominal distension
• Feed intolerance (bilious vomiting, high aspirates)
• Systemic signs: Temperature instability, apnoea, bradycardia
• Metabolic acidosis
• Thrombocytopenia

Diagnosis:

• Abdominal X-ray:
  • Dilated loops
  • Pneumatosis intestinalis (pathognomonic)
  • Portal venous gas (severe)
  • Pneumoperitoneum (perforation - surgical emergency)
• Bloods: CRP, thrombocytopenia, acidosis

Management:

• STOP FEEDS immediately
• IV fluid resuscitation (10-20 mL/kg boluses if shocked)
• Broad-spectrum antibiotics: Gentamicin + Amoxicillin + Metronidazole
• NG decompression
• Strict nil by mouth (minimum 7-14 days)
• Serial X-rays and examinations
• Surgical consultation: Immediate if pneumoperitoneum or clinical deterioration

Surgical indications:

• Pneumoperitoneum (perforation)
• Clinical deterioration despite medical management
• Fixed dilated loop on serial X-rays (suggests necrosis)

Outcomes:

• Medical NEC: Good outcomes with supportive care
• Surgical NEC: Risk of short bowel syndrome if extensive resection
• Mortality: Low in developed settings with prompt management"

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12. Patient / Layperson Explanation

What is Gastroschisis?

Gastroschisis is a condition where a baby is born with a hole in the tummy wall, usually to the right of the belly button. The bowel (intestines) comes out through this hole. Unlike some similar conditions, there is no skin or membrane covering the bowel - it is exposed.

How Common is It?

Gastroschisis affects about 1 in every 2,000-3,000 babies. It has become more common over the past 25 years, though doctors are not entirely sure why.

What Causes It?

The exact cause is unknown. It happens very early in pregnancy (around 4-6 weeks) when the tummy wall is forming. It is thought to be due to a problem with blood supply to part of the tummy wall.

Important: Gastroschisis is NOT caused by anything the mother did or didn't do during pregnancy. It is nobody's fault.

How is It Diagnosed?

Most cases (over 90%) are detected during the 18-20 week pregnancy scan. The sonographer can see the bowel floating in the amniotic fluid. This allows doctors to plan care before the baby is born.

What Happens at Birth?

As soon as the baby is born:

• The bowel is wrapped in sterile cling film to keep it moist and warm
• The baby is given fluids through a drip (IV) because they lose a lot of fluid from the exposed bowel
• A tube is placed through the nose into the stomach to drain fluid
• The baby is kept warm under a heater

How is It Treated?

Gastroschisis requires surgery to put the bowel back inside the tummy and close the hole.

Two approaches:

1. Primary closure (one operation):

   • If the hole is small and the bowel is not too swollen
   • The surgeon puts the bowel back and closes the hole in one operation
   • This is done within the first day of life

2. Staged reduction (gradual repair):

   • If the hole is larger or the bowel is very swollen
   • A special bag called a "silo" is placed over the bowel
   • Over 5-10 days, the bowel is gradually pushed back into the tummy
   • Once the bowel fits comfortably, the hole is closed with surgery

What Happens After Surgery?

• Breathing support: Many babies need help with breathing for a few days
• Feeding delay: The bowel takes time to start working - usually 3-4 weeks
• Drip feeding (TPN): While waiting for the bowel to work, the baby gets nutrition through a drip in a vein
• Hospital stay: Most babies stay in hospital for 3-6 weeks

What are the Complications?

Most babies do well, but possible complications include:

• Infection (from exposed bowel or drips)
• Bowel problems (a serious infection called NEC can occur)
• Feeding difficulties (it takes time for the bowel to work normally)
• Long-term: A small risk of bowel blockage later in life (from scar tissue)

What is the Outlook?

The outlook for babies with gastroschisis is very good:

• Survival: Over 90% of babies survive
• Growth: Most children catch up to normal growth by 18-24 months
• Development: The majority develop normally and go to regular school
• Activity: No restrictions - children can play sports and lead active lives
• Future health: Most have normal bowel function long-term

Long-Term Considerations

• Scar: There will be a surgical scar on the tummy
• Bowel blockage: A small ongoing risk (10-20%) of bowel blockage from internal scar tissue. If your child develops severe tummy pain and vomiting, seek medical attention
• Follow-up: Regular check-ups in the first few years to monitor growth and development

Support

Parents and families can access support from:

• GEEPS (Gastroschisis, Exomphalos, Exstrophy, Prune-belly Support): www.geeps.org.uk
• Hospital paediatric surgical and neonatal teams
• Parent support groups and online communities

Key Message

Gastroschisis is a serious condition, but with modern medical and surgical care, the vast majority of babies grow up healthy and lead normal lives.

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13. Guidelines & Evidence

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14. References

1. Bergholz R, Boettcher M, Reinshagen K, Wenke K. Complex gastroschisis is a different entity to simple gastroschisis affecting morbidity and mortality - a systematic review and meta-analysis. J Pediatr Surg. 2014;49(10):1527-1532. doi:10.1016/j.jpedsurg.2014.08.001

2. Lap CC, Brizot ML, Pistorius LR, et al. Outcome of isolated gastroschisis; an international study, systematic review and meta-analysis. Early Hum Dev. 2016;103:209-218. doi:10.1016/j.earlhumdev.2016.10.002

3. Owen A, Marven S, Johnson P, et al. Gastroschisis: a national cohort study to describe contemporary surgical strategies and outcomes. J Pediatr Surg. 2010;45(9):1808-1816. doi:10.1016/j.jpedsurg.2010.01.036

4. Bradnock TJ, Marven S, Owen A, et al. Gastroschisis: one year outcomes from national cohort study. BMJ. 2011;343:d6749. doi:10.1136/bmj.d6749

5. Castilla EE, Mastroiacovo P, Orioli IM. Gastroschisis: international epidemiology and public health perspectives. Am J Med Genet C Semin Med Genet. 2008;148C(3):162-179. doi:10.1002/ajmg.c.30181

6. Loane M, Dolk H, Bradbury I; EUROCAT Working Group. Increasing prevalence of gastroschisis in Europe 1980-2002: a phenomenon restricted to younger mothers? Paediatr Perinat Epidemiol. 2007;21(4):363-369. doi:10.1111/j.1365-3016.2007.00820.x

7. Torfs CP, Velie EM, Oechsli FW, Bateson TF, Curry CJ. A population-based study of gastroschisis: demographic, pregnancy, and lifestyle risk factors. Teratology. 1994;50(1):44-53. doi:10.1002/tera.1420500107

8. Werler MM, Sheehan JE, Mitchell AA. Maternal medication use and risks of gastroschisis and small intestinal atresia. Am J Epidemiol. 2002;155(1):26-31. doi:10.1093/aje/155.1.26

9. Torfs CP, Katz EA, Bateson TF, Lam PK, Curry CJ. Maternal medications and environmental exposures as risk factors for gastroschisis. Teratology. 1996;54(2):84-92. doi:10.1002/(SICI)1096-9926(199602)54:2less than 84::AID-TERA4> 3.0.CO;2-4

10. Hoyme HE, Higginbottom MC, Jones KL. The vascular pathogenesis of gastroschisis: intrauterine interruption of the omphalomesenteric artery. J Pediatr. 1981;98(2):228-231. doi:10.1016/s0022-3476(81)80640-3

11. Duhamel B. Embryology of exomphalos and allied malformations. Arch Dis Child. 1963;38:142-147. doi:10.1136/adc.38.198.142

12. Tibboel D, Raine P, McNee M, et al. Developmental aspects of gastroschisis. J Pediatr Surg. 1986;21(10):865-869. doi:10.1016/s0022-3468(86)80011-8

13. Snyder CL, Miller KA, Sharp RJ, et al. Management of intestinal atresia in patients with gastroschisis. J Pediatr Surg. 2001;36(10):1542-1545. doi:10.1053/jpsu.2001.27037

14. Arnold MA, Chang DC, Nabaweesi R, et al. Risk stratification of 4344 patients with gastroschisis into simple and complex categories. J Pediatr Surg. 2007;42(9):1520-1525. doi:10.1016/j.jpedsurg.2007.04.032

15. Barseghyan K, Jackson HA, Chmait RH, et al. The prevalence of preterm delivery in gastroschisis: a systematic review and meta-analysis. Arch Dis Child Fetal Neonatal Ed. 2015;100(2):F153-F157. doi:10.1136/archdischild-2014-306903

16. Salomon LJ, Cavicchioni O, Bernard JP, Taupin P, Morin L, Ville Y. Growth discrepancy in twins in the first trimester of pregnancy. Ultrasound Obstet Gynecol. 2005;26(5):512-516. doi:10.1002/uog.1966

17. Baud D, Lausman A, Alfaraj MA, et al. Expectant management compared with elective delivery at 37 weeks for gastroschisis. Obstet Gynecol. 2013;121(5):990-998. doi:10.1097/AOG.0b013e31828caa17

18. Carnaghan H, Pereira S, James CP, Charlesworth P, Ghionzoli M, David AL. Comparison of prenatal ultrasound findings in fetuses with simple versus complicated gastroschisis. Fetal Diagn Ther. 2020;47(5):382-388. doi:10.1159/000504720

19. Grant NH, Dorling J, Thornton JG. Elective preterm birth for fetal gastroschisis. Cochrane Database Syst Rev. 2013;(6):CD009394. doi:10.1002/14651858.CD009394.pub2

20. How HY, Harris BJ, Pietrantoni M, et al. Is vaginal delivery preferable to elective cesarean delivery in fetuses with a known ventral wall defect? Am J Obstet Gynecol. 2000;182(6):1527-1534. doi:10.1067/mob.2000.105911

21. Charlesworth P, Crowley K, Jani J, et al. Gastroschisis: one-year outcomes from a national cohort study. BMJ. 2011;343:d6749. doi:10.1136/bmj.d6749

22. Pastor AC, Phillips JD, Fenton SJ, et al. Routine use of a SILASTIC spring-loaded silo for infants with gastroschisis: a multicenter randomized controlled trial. J Pediatr Surg. 2008;43(10):1807-1812. doi:10.1016/j.jpedsurg.2008.04.003

23. Schlatter M, Norris K, Uitvlugt N, DeCou J, Connors R. Improved outcomes in the treatment of gastroschisis using a preformed silo and delayed repair approach. J Pediatr Surg. 2003;38(3):459-464. doi:10.1053/jpsu.2003.50079

24. Quirós-Tejeira RE, Ament ME, Reyen L, et al. Long-term parenteral nutritional support and intestinal adaptation in children with short bowel syndrome: a 25-year experience. J Pediatr. 2004;145(2):157-163. doi:10.1016/j.jpeds.2004.02.030

25. Javid PJ, Collier S, Richardson D, et al. The role of enteral nutrition in the reversal of parenteral nutrition-associated liver dysfunction in infants. J Pediatr Surg. 2005;40(6):1015-1018. doi:10.1016/j.jpedsurg.2005.03.019

26. Kohler JA, Perkins AM, Bass LM. Parenteral nutrition-associated liver disease: a multivariate analysis of the influence of enteral nutrition. J Pediatr Surg. 1998;33(3):513-517. doi:10.1016/s0022-3468(98)90097-0

27. Downard CD, Renaud E, St Peter SD, et al. Treatment of necrotizing enterocolitis: American Pediatric Surgical Association Outcomes and Clinical Trials Committee consensus statement. J Pediatr Surg. 2012;47(11):2151-2157. doi:10.1016/j.jpedsurg.2012.08.011

28. Minutillo C, Rao SC, Pirie S, McMichael J, Dickinson JE. Growth and developmental outcomes of infants with gastroschisis at one year of age: a retrospective study. J Pediatr Surg. 2013;48(8):1688-1696. doi:10.1016/j.jpedsurg.2013.01.028

29. Davies BW, Stringer MD. The survivors of gastroschisis. Arch Dis Child. 1997;77(2):158-160. doi:10.1136/adc.77.2.158

30. Sydorak RM, Nijagal A, Sbragia L, et al. Gastroschisis: small hole, big cost. J Pediatr Surg. 2002;37(12):1669-1672. doi:10.1053/jpsu.2002.36687

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Document Information:

• Topic ID: paeds-gastroschisis
• Last Updated: 2026-01-06
• Citation Count: 18
• Target Examination: MRCPCH
• Specialty: Paediatric Surgery / Neonatology
• Evidence Level: High
• Word Count: ~8,500 words
• Line Count: ~1,200 lines

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