Poor feeding and feeding intolerance in the neonate — viva

Stem

The examiner hands you the bedside record of a 12-day-old infant born at 27 weeks, on advancing expressed breast milk feeds: a gastric residual larger than the feed, bile-stained, with a fuller abdomen and three apnoeic spells. [1]

Examiner: What is your opening approach to this infant? [1]

Strong answer: This is feeding intolerance with systemic signs in an extremely preterm infant — necrotising enterocolitis until proven otherwise. The increasing and bile-stained residual, the abdominal distension, and the new apnoea are the systemic and gastrointestinal signs of early NEC. I would stop feeds immediately, pass a large-bore orogastric tube on free drainage to decompress the gut, establish intravenous access, resuscitate with isotonic crystalloid boluses titrated to perfusion, correct glucose and temperature, and start broad-spectrum empiric antibiotics. I would send an abdominal radiograph and the laboratory panel and escalate to the neonatal team. [2]

Branch 1 — Recognition and the bilious residual

Examiner: How do you interpret a bile-stained gastric residual, and how does it differ from a milk-coloured residual in a well preterm? [2]

Strong answer: A bile-stained residual is a red flag — it suggests obstruction or NEC, and it must not be re-fed. I judge a residual by its trend and its character, not by volume alone: a residual that is increasing, bilious, blood-stained, or changing in character is a danger sign, whereas small, stable, milk-coloured residuals in a well, growing preterm are consistent with functional immaturity. Mihatsch showed that gastric residual volume correlates poorly with feeding tolerance, so I would never let the volume in isolation drive the decision. [2]

Examiner probe: Why are the systemic signs so important here? [3]

Strong answer: Because the early signs of NEC are often systemic rather than abdominal — temperature instability, apnoea and bradycardia, lethargy, and glucose instability — and these are also the early signs of neonatal sepsis. Poor feeding is often the first sign of sepsis, which is why a feeding concern in a preterm is never routine. These signs tell me the gut is sick and the infant is decompensating, so I act before the abdominal signs become severe. [3]

Branch 2 — Investigation and staging

Examiner: You send an abdominal radiograph and it shows pneumatosis intestinalis. How does this change the picture, and what is your staging? [1]

Strong answer: Pneumatosis intestinalis — gas in the bowel wall — is the radiographic hallmark of definite NEC, Bell stage II. This is the radiographic threshold that confirms the diagnosis. Under the modified Bell criteria, stage I (suspected) has systemic and gastrointestinal signs with a non-specific or normal radiograph; stage II (definite) adds pneumatosis or portal venous gas; and stage III (advanced) adds shock, metabolic acidosis, thrombocytopenia, ascites, or free intra-abdominal gas. This infant, with pneumatosis but no shock or perforation yet, is stage II. [1]

Examiner probe: What would free intra-abdominal gas mean, and how would your management change? [1]

Strong answer: Free air indicates perforation — Bell stage IIIB. That is an indication for urgent surgical intervention: in the very-low-birth-weight infant, a primary peritoneal drain may be first-line, whereas proven NEC with necrosis needs a laparotomy with resection and stoma. The NPO period extends to 14 days or more, and the mortality and long-term morbidity rise sharply. I would involve the surgical team immediately and move the infant to the highest level of neonatal care. [1]

Branch 3 — Re-advancing feeds and prevention

Examiner: The infant recovers. How do you re-advance feeds, and what does the evidence say about advancement rate? [4]

Strong answer: Once the infant is clinically stable, the radiograph has normalised, and the systemic and abdominal signs have resolved, I re-advance on a standardised feeding protocol: start with minimal enteral (trophic) feeds of mother's own milk, advance slowly, use a single feed type, and check tolerance before each advancement. The Cochrane review by Oddie and Young (2021) found that slow advancement does not by itself reduce NEC compared with faster advancement — which tells me the protection comes from standardisation and human milk, not from starving the infant. So I advance deliberately but do not withhold nutrition out of fear. [4]

Examiner probe: What is the role of probiotics? [5]

Strong answer: The Cochrane review by Sharif and Meader (2023) found that probiotics probably reduce NEC and mortality in very preterm or very-low-birth-weight infants. But implementation is contested because of safety concerns — probiotic bacteraemia in the extremely preterm, and variable product quality — and policy varies between units and regions. I would follow the local unit protocol, and in the exam I would name the benefit and the safety caveats rather than state a blanket recommendation. [5]