Necrotizing Enterocolitis — MCQs
What is the most common cause of infantile diarrhea?
What will be the appropriate management for a very low birth weight preterm baby who is on a ventilator for respiratory distress and presents with clinical features of necrotizing enterocolitis with perforation?
Which of the following statements is MOST accurate regarding neonatal sepsis?
Which of the following is least likely in PDA?
A child is being assessed for possible intussusception; which of the following would be LEAST likely to provide valuable information?
Gas absent from intestine (gasless abdomen) on x-ray is seen in which condition?
What is the most definitive indication for surgery in necrotizing enterocolitis?
Which one of the following regarding abdominal pediatric surgery is correct?
Which among the following is NOT part of the classic clinical triad of necrotizing enterocolitis?
A previously healthy infant presents with a recurrent episode of abdominal pain. The mother says that the child has been passing an altered stool after episodes of pain, but gives no history of vomiting or bleeding per rectum. Which of the following is the most likely diagnosis –
Necrotizing Enterocolitis Indian Medical PG Practice Questions and MCQs
Question 1: What is the most common cause of infantile diarrhea?
- A. Adenovirus
- B. Rotavirus (Correct Answer)
- C. Reovirus
- D. Norovirus
Explanation: ***Rotavirus*** - **Rotavirus** is the **classic and most common cause** of severe, dehydrating **diarrhea** in infants and young children worldwide, especially in unvaccinated populations. - It remains the **standard answer** in medical examinations and textbooks. - While **rotavirus vaccine introduction** (Universal Immunization Program in India) has significantly reduced its prevalence in vaccinated populations, it continues to be a major pathogen in areas with incomplete vaccine coverage. - Presents with **watery diarrhea, vomiting, fever**, and can lead to severe dehydration. *Adenovirus* - **Adenovirus** (especially serotypes 40 and 41) can cause **gastroenteritis**, but it is a **less common cause** of infantile diarrhea compared to rotavirus. - It often presents with **respiratory symptoms** in addition to diarrhea. - Accounts for approximately **5-10%** of viral gastroenteritis cases. *Reovirus* - **Reovirus** is a family of viruses, and while some members can infect humans, they are **rarely associated** with significant or widespread diarrheal disease. - It is **not considered a common cause** of infantile diarrhea in clinical practice. *Norovirus* - **Norovirus** is a **very common cause of gastroenteritis** in older children and adults, often in outbreak settings (schools, cruise ships). - While it can affect infants and has increased in relative frequency in highly vaccinated populations, **rotavirus historically and classically predominated** as the leading cause of severe infantile diarrhea. - Norovirus causes more **sporadic cases** in infancy compared to rotavirus.
Question 2: What will be the appropriate management for a very low birth weight preterm baby who is on a ventilator for respiratory distress and presents with clinical features of necrotizing enterocolitis with perforation?
- A. Conservative management
- B. Immediate laparotomy
- C. Peritoneal drainage (Correct Answer)
- D. ECMO with surgery after stabilization
Explanation: ***Peritoneal drainage for perforated necrotizing enterocolitis*** - **Peritoneal drainage** is preferred in **critically ill, very low birth weight preterm infants** with perforated NEC as an initial stabilizing measure. - This minimally invasive procedure involves inserting a drain to remove contaminated fluid, which can improve the baby's condition enough to hopefully allow for definitive surgical repair later. *Conservative management for perforated necrotizing enterocolitis* - **Conservative management** is generally reserved for **early-stage NEC without perforation** as perforation indicates a surgical emergency. - Delaying surgical intervention in the presence of perforation can lead to **sepsis, multiple organ failure, and death**. *Immediate laparotomy for perforated necrotizing enterocolitis* - While definitive, **immediate laparotomy** carries high risks for **extremely premature and unstable infants** due to challenges with anesthesia, fluid balance, and temperature regulation. - Often, babies are too unstable for a major surgery, and **peritoneal drainage** is used to stabilize them first. *ECMO with surgery after stabilization for perforated necrotizing enterocolitis* - **ECMO (extracorporeal membrane oxygenation)** is a life support measure for **severe respiratory or cardiac failure**, not primarily for perforated NEC. - While it can support very sick infants, it's a highly invasive procedure with its own complications and doesn't directly address the surgical emergency of perforation.
Question 3: Which of the following statements is MOST accurate regarding neonatal sepsis?
- A. Meningitis is a late complication of sepsis.
- B. Fever can occur in neonatal sepsis but is not always present. (Correct Answer)
- C. Jaundice is a possible symptom of neonatal sepsis but not definitive.
- D. None of the options.
Explanation: ***Fever can occur in neonatal sepsis but is not always present.*** - This is the **MOST accurate and clinically critical** statement about neonatal sepsis. - Neonates with sepsis often present with **non-specific symptoms** due to their immature immune system, and **hypothermia or temperature instability** is MORE common than fever. - The **absence of fever does NOT rule out sepsis** in neonates—this is a fundamental principle in neonatal medicine. - Temperature instability (including hypothermia) is one of the **primary presenting signs** of neonatal sepsis and represents a critical diagnostic pitfall if not recognized. *Meningitis is a late complication of sepsis.* - This statement is **INCORRECT**. - In neonates, **meningitis** is often an **early or concurrent manifestation** of sepsis, NOT a late complication. - The immature **blood-brain barrier** in neonates allows rapid CNS seeding, meaning meningitis can occur simultaneously with bacteremia in early-onset sepsis. - Up to **25-30% of neonatal sepsis cases** have concurrent meningitis, especially with Group B Streptococcus and E. coli. *Jaundice is a possible symptom of neonatal sepsis but not definitive.* - This statement is **technically accurate** but NOT the MOST accurate answer. - While **jaundice** can occur in neonatal sepsis (due to hepatic dysfunction, hemolysis, or cholestasis), it is an extremely **common and often benign finding** in neonates. - Jaundice is present in **60% of term** and **80% of preterm** neonates, mostly from physiological causes. - Unlike temperature instability (Option B), jaundice is a **less specific and less critical** diagnostic sign for sepsis. *None of the options.* - This option is incorrect because Option B is accurate and represents the most clinically important statement.
Question 4: Which of the following is least likely in PDA?
- A. CO, wash out (Correct Answer)
- B. Bounding pulse
- C. Pulmonary hemorrhage
- D. Necrotizing enterocolitis
Explanation: ***CO₂ washout*** - **CO₂ washout** is not a recognized clinical complication or standard finding associated with PDA - While PDA causes **pulmonary overcirculation**, this does not translate into a clinically significant "CO₂ washout" phenomenon - The other options represent well-established associations with hemodynamically significant PDA - This is the **least likely** finding in PDA *Bounding pulse* - **Classic finding** in PDA due to left-to-right shunt from aorta to pulmonary artery - Results in **wide pulse pressure** as diastolic pressure drops (blood "runs off" into pulmonary circulation) - Creates characteristic **water-hammer** or **bounding peripheral pulses** *Pulmonary hemorrhage* - Well-recognized complication of hemodynamically significant PDA, especially in **premature infants** - **Increased pulmonary blood flow and pressure** from left-to-right shunt leads to pulmonary edema and capillary damage - Fragile pulmonary vasculature in preterm infants predisposes to **hemorrhage** *Necrotizing enterocolitis* - **Significant association** between PDA and NEC in premature infants - Mechanism: **Diastolic steal** phenomenon causes mesenteric hypoperfusion - The left-to-right shunt diverts blood flow during diastole, leading to **gut ischemia** - PDA is a recognized **risk factor** for NEC development
Question 5: A child is being assessed for possible intussusception; which of the following would be LEAST likely to provide valuable information?
- A. Pain pattern
- B. Family history (Correct Answer)
- C. Abdominal palpation
- D. Stool inspection
Explanation: ***Family history*** - Intussusception is typically an **acute pediatric condition** with no strong genetic predisposition. - While certain genetic syndromes can increase risk, general family history of other conditions is **not directly relevant** to confirming or ruling out intussusception. *Pain pattern* - The classic **intermittent, colicky abdominal pain** that recurs every 15-20 minutes is a hallmark symptom of intussusception. - This pattern provides crucial diagnostic information about the **bowel telescoping and transient obstruction**. *Abdominal palpation* - Palpation can reveal a **sausage-shaped abdominal mass**, especially in the right upper quadrant, which is a classic physical finding. - Tenderness, distension, and signs of peritonitis can also be detected, indicating **bowel obstruction or perforation**. *Stool inspection* - The presence of "**currant jelly stool**" (blood and mucus) is a highly characteristic sign of intussusception, resulting from venous congestion and sloughing of the intestinal mucosa. - This finding provides clear evidence of **intestinal ischemia and bleeding**.
Question 6: Gas absent from intestine (gasless abdomen) on x-ray is seen in which condition?
- A. Ulcerative colitis
- B. Intussusception
- C. Acute pancreatitis (Correct Answer)
- D. Necrotizing enterocolitis
Explanation: ***Acute pancreatitis*** - In **severe acute pancreatitis**, a **gasless or relatively gasless abdomen** may be seen due to profound **ileus** with fluid accumulation displacing intestinal gas. - The marked inflammatory process can lead to complete loss of intestinal motility and fluid sequestration (third-spacing), resulting in minimal visible bowel gas on X-ray. - **Note**: Classic signs include **sentinel loop sign** (dilated jejunal loop) or **colon cut-off sign**, but in severe cases with massive ascites or fluid collections, a gasless pattern may occur. *Ulcerative colitis* - Typically presents with **dilated loops of large bowel** with visible gas and **toxic megacolon** in severe cases. - Inflammatory changes cause bowel wall thickening, but gas is usually **present and often increased**. *Intussusception* - May show a **target sign** or **meniscus sign** on imaging, with bowel loops dilated proximal to the obstruction. - Gas is typically **present** within the bowel or proximal to the invagination, not absent from the entire abdomen. *Necrotizing enterocolitis* - Characterized by **pneumatosis intestinalis** (gas in the bowel wall) and **portal venous gas**, features directly contradicting a gasless abdomen. - Shows dilated loops with gas and evidence of bowel wall necrosis - **gas is prominently present**.
Question 7: What is the most definitive indication for surgery in necrotizing enterocolitis?
- A. Pneumatosis intestinalis- Stage IIA of NEC
- B. Pneumoperitoneum- Stage IIIB of NEC (Correct Answer)
- C. Peritonitis- Stage IIIA of NEC
- D. Portal Vein gas- Stage IIB of NEC
Explanation: ***Pneumoperitoneum- Stage IIIB of NEC*** - **Pneumoperitoneum** (free air in the peritoneal cavity) is the **most definitive indication** for immediate surgical intervention in necrotizing enterocolitis (NEC), as it provides radiological proof of bowel perforation. - This finding represents advanced disease (**Stage IIIB** according to the **modified Bell's staging criteria**) and is an **absolute indication for surgery**. - Pneumoperitoneum is detected on plain abdominal radiographs or cross-table lateral films and indicates full-thickness bowel necrosis with perforation. *Pneumatosis intestinalis- Stage IIA of NEC* - **Pneumatosis intestinalis** (intramural gas in the bowel wall) is a hallmark radiological sign of NEC but does **not** warrant surgery in Stage IIA. - Stage IIA is managed with **medical therapy** including NPO (nil per oral), nasogastric decompression, broad-spectrum antibiotics, and supportive care unless there are signs of clinical deterioration or progression to advanced stages. *Portal Vein gas- Stage IIB of NEC* - **Portal vein gas** indicates severe bowel ischemia and necrosis and is a concerning prognostic sign associated with advanced NEC (Stage IIB). - While it signifies severe disease, portal vein gas is **not an absolute indication for surgery** by itself; surgical intervention is based on overall clinical status, presence of peritonitis, or pneumoperitoneum. *Peritonitis- Stage IIIA of NEC* - Clinical signs of **peritonitis** (abdominal wall erythema, edema, tenderness, guarding, rigidity) indicate Stage IIIA NEC and **are also an indication for surgery**. - However, **pneumoperitoneum** is considered the **most definitive** indication as it provides objective radiological evidence of perforation, whereas peritonitis is based on clinical examination which can be challenging in premature neonates.
Question 8: Which one of the following regarding abdominal pediatric surgery is correct?
- A. Transverse abdominal incision is always used
- B. Bowel must be always anastomosed in double layer
- C. Skin over abdomen can never be closed with subcuticular sutures
- D. Incision can be closed with absorbable suture (Correct Answer)
Explanation: ***Incision can be closed with absorbable suture*** - **Absorbable sutures** are commonly used in pediatric abdominal surgery for closing deeper layers and sometimes skin, as they degrade over time and do not require removal. - This is particularly beneficial in children to avoid the trauma and discomfort of suture removal and to promote good cosmetic outcomes. *Transverse abdominal incision is always used* - While **transverse incisions** are often preferred in pediatric abdominal surgery for their good cosmetic results and lower incidence of incisional hernias, they are not *always* used. - Other incisions, such as **vertical midline incisions**, may be utilized depending on the surgical exposure required, the specific pathology, or the surgeon's preference. *Bowel must be always anastomosed in double layer* - **Bowel anastomoses** in pediatric surgery can be performed using either a **single-layer** or **double-layer** technique. - The choice depends on surgeon preference, the specific bowel segment involved, and the patient's condition, with both methods demonstrating comparable outcomes in many situations. *Skin over abdomen can never be closed with subcuticular sutures* - **Subcuticular sutures** are frequently used for skin closure in pediatric abdominal surgery, especially for their excellent cosmetic results and to avoid external suture removal. - This technique places the suture material under the skin surface, minimizing scarring and being well-suited for a child's healing skin.
Question 9: Which among the following is NOT part of the classic clinical triad of necrotizing enterocolitis?
- A. Bloody stools
- B. Metabolic acidosis (Correct Answer)
- C. Pneumatosis intestinalis
- D. Abdominal distension
Explanation: ***Metabolic acidosis*** - Metabolic acidosis is **not** part of the classic clinical triad of necrotizing enterocolitis, though it is a common laboratory finding in severe cases. - The **classic triad of NEC** consists of: **abdominal distension**, **bloody stools**, and **pneumatosis intestinalis** on radiography. - Metabolic acidosis occurs as a consequence of intestinal ischemia and sepsis but is not included in the defining triad. *Abdominal distension* - **Abdominal distension** is a cardinal clinical feature and part of the classic triad. - Results from intestinal inflammation, ileus, and gas accumulation. *Bloody stools* - **Bloody stools** (grossly bloody or occult blood positive) are part of the classic triad. - Reflect mucosal injury and intestinal necrosis. *Pneumatosis intestinalis* - **Pneumatosis intestinalis** (intramural gas on abdominal X-ray) is the pathognomonic radiological finding in the classic triad. - Indicates gas-forming bacterial invasion of the damaged intestinal wall.
Question 10: A previously healthy infant presents with a recurrent episode of abdominal pain. The mother says that the child has been passing an altered stool after episodes of pain, but gives no history of vomiting or bleeding per rectum. Which of the following is the most likely diagnosis –
- A. Intussusception (Correct Answer)
- B. Meckel's Diverticulum
- C. Rectal Polyps
- D. Necrotizing Enterocolitis
Explanation: ***Intussusception*** - Recurrent episodes of **colicky abdominal pain** in an infant, followed by passage of **altered stool**, are classic signs of intussusception. - The "altered stool" likely represents **early mucosal changes** before the development of the characteristic "currant jelly" stool (blood mixed with mucus), which typically appears later in the disease course. - The absence of obvious bleeding per rectum (as reported by the mother) is consistent with **early intussusception**, where the classic triad (pain, vomiting, currant jelly stool) may not all be present initially. - Intussusception is the **most common cause of intestinal obstruction** in infants aged 6-36 months. *Meckel's Diverticulum* - Meckel's diverticulum typically presents with **painless rectal bleeding** due to ectopic gastric mucosa causing ulceration of adjacent ileal mucosa. - When symptomatic, it causes bright red or maroon rectal bleeding rather than the pattern described here. - Recurrent colicky pain with altered stool is not characteristic. *Rectal Polyps* - Juvenile rectal polyps present with **painless, bright red rectal bleeding** on the stool surface. - They do not typically cause recurrent episodes of severe colicky abdominal pain. - The bleeding is intermittent and not associated with the pain pattern described. *Necrotizing Enterocolitis* - NEC primarily affects **premature infants** and critically ill newborns in the neonatal period. - It presents acutely with abdominal distension, feeding intolerance, bloody stools, and systemic signs of sepsis. - It is not characterized by recurrent episodes in a **previously healthy infant** and would not present with this chronic pattern.
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