Neonatal Intestinal Obstruction — MCQs
Double bubble sign is seen in -
Most common cause of acute intestinal obstruction in children is
A newborn suffering from perforated necrotizing enterocolitis is having very poor general condition. He is currently stabilized on ventilator. Which of the following should be done in the management of this patient?
Which pigment is responsible for the greenish-black color of neonatal stool?
What is indicated by the 'double bubble sign' on prenatal ultrasound?
A newborn male is noted to have difficulty feeding and "turns blue and chokes when drinking formula." The prenatal records reveal that the amniotic fluid appeared normal on ultrasound. A pediatric feeding tube is passed orally to 20 cm without difficulty, with gastric secretions aspirated. Which of the following is the most likely diagnosis?
What is the most definitive indication for surgery in necrotizing enterocolitis?
A pregnant female had meconium-stained liquor and underwent emergency LSCS. A few days later, her condition deteriorated, and an ultrasound showed edematous bowels. What is the most likely cause of her condition?
What is the initial palliative treatment for Tetralogy of Fallot?
Biopsy in Hirschsprung's disease can be taken from which level?
Neonatal Intestinal Obstruction Indian Medical PG Practice Questions and MCQs
Question 1: Double bubble sign is seen in -
- A. Duodenal atresia
- B. Annular pancreas
- C. Ladd's band
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - The **"double bubble sign"** on an X-ray indicates **duodenal obstruction**, which can be caused by intrinsic factors like **duodenal atresia** or extrinsic compressions such as an **annular pancreas** or **Ladd's bands** associated with malrotation. - While differing in etiology, all these conditions lead to fluid and air accumulation in the stomach and proximal duodenum, creating the characteristic two dilated loops. *Duodenal atresia* - This is an **intrinsic congenital obstruction** of the duodenum, preventing the passage of gastric and duodenal contents. - On imaging, it shows **two distinct air-filled bubbles** (one for the stomach, one for the proximal duodenum) separated by the pylorus. *Ladd's band* - **Ladd's bands** are peritoneal fibrous bands that can compress the duodenum in cases of **intestinal malrotation**, leading to extrinsic obstruction. - The resulting proximal duodenal dilation, along with gastric distension, presents as the **double bubble sign**. *Annular pancreas* - An **annular pancreas** is a congenital anomaly where pancreatic tissue completely encircles and obstructs the second part of the duodenum. - This extrinsic compression causes significant dilation of the stomach and proximal duodenum, mimicking the appearance of the **double bubble sign**.
Question 2: Most common cause of acute intestinal obstruction in children is
- A. Inguinal hernia
- B. Intussusception (Correct Answer)
- C. Volvulus
- D. None of the options
Explanation: ***Intussusception*** - **Intussusception** is the most common cause of **acute intestinal obstruction** in children, particularly between 3 months and 3 years of age. - It occurs when a segment of the intestine telescopes into an adjacent segment, leading to obstruction and potentially **ischemia**. *Inguinal hernia* - While an **incarcerated inguinal hernia** can cause intestinal obstruction, it is less common than intussusception as the primary cause of acute obstruction in children generally. - It is more frequent in **neonates and infants** but overall incidence of obstruction is lower than intussusception. *Volvulus* - **Volvulus** refers to a twisting of the intestine on its mesentery, often associated with **malrotation**, leading to obstruction and vascular compromise. - While a serious cause of obstruction, especially in neonates, it is less common overall than intussusception in the pediatric population. *None of the options* - This option is incorrect because **intussusception** is a recognized and frequent cause of acute intestinal obstruction in children.
Question 3: A newborn suffering from perforated necrotizing enterocolitis is having very poor general condition. He is currently stabilized on ventilator. Which of the following should be done in the management of this patient?
- A. Peritoneal drainage (Correct Answer)
- B. Resection and anastomosis
- C. Conservative treatment
- D. Stabilization with membrane oxygenator and defer surgery
Explanation: ***Peritoneal drainage*** - In a newborn with **perforated necrotizing enterocolitis (NEC)** and **poor general condition**, peritoneal drainage is the preferred initial surgical approach to address sepsis while avoiding major abdominal surgery. - This procedure involves draining accumulated fluid and pus from the peritoneal cavity, reducing intra-abdominal pressure and systemic inflammation in a medically unstable patient. *Resection and anastomosis* - **Resection and primary anastomosis** is a more extensive surgical procedure that carries higher risks in a globally unstable neonate. - This surgery is typically reserved for more stable patients or as a secondary procedure once the patient's condition has improved following initial decompression. *Conservative treatment* - **Conservative treatment** alone is insufficient and inappropriate for **perforated necrotizing enterocolitis**, as perforation implies the need for surgical intervention to address peritonitis and sepsis. - Delaying surgical management in perforation can lead to rapid deterioration, severe sepsis, and increased mortality. *Stabilization with membrane oxygenator and defer surgery* - While an **extracorporeal membrane oxygenator (ECMO)** might be used for respiratory or cardiovascular support in severe cases, it does not address the underlying **perforation and peritonitis**. - **Deferring surgery** for perforation is not an option as surgical source control is necessary to manage the acute peritonitis and sepsis, even if the patient is on ECMO.
Question 4: Which pigment is responsible for the greenish-black color of neonatal stool?
- A. Biliverdin (Correct Answer)
- B. Urochrome
- C. Stercobilin
- D. Bilirubin (yellow pigment)
Explanation: ***Biliverdin*** - **Biliverdin** is a green pigment formed from the breakdown of heme before it is converted to bilirubin, and it is responsible for the greenish-black color of **meconium**. - The presence of this pigment in the stool indicates the passage of **meconium**, the first stool of a newborn. *Urochrome* - **Urochrome** is responsible for the yellow color of **urine**, not stool. - It is a pigment derived from **bilirubin** that is excreted by the kidneys. *Stercobilin* - **Stercobilin** is responsible for the characteristic **brown color of adult feces**. - It is formed when **bilirubin** is metabolized by bacteria in the intestine. *Bilirubin (yellow pigment)* - **Bilirubin** is typically a **yellow-orange pigment**, not greenish-black. - While bilirubin is the precursor to stercobilin, its yellow form is more associated with **jaundice** when present in high concentrations.
Question 5: What is indicated by the 'double bubble sign' on prenatal ultrasound?
- A. Hirschsprung disease
- B. Pyloric stenosis
- C. Duodenal atresia (Correct Answer)
- D. Esophageal atresia
Explanation: ***Duodenal atresia*** - The **double bubble sign** on prenatal ultrasound is pathognomonic for **duodenal atresia**, representing a dilated stomach and a dilated first part of the duodenum. - This congenital anomaly results from a failure of the **duodenal lumen** to recanalize during fetal development, leading to a complete obstruction. *Hirschsprung disease* - Characterized by the absence of **ganglion cells** in the distal colon, leading to functional obstruction, but it does not typically present as a **double bubble sign** on prenatal ultrasound. - While it can cause bowel dilation, it usually affects more distal portions of the bowel and presents with symptoms like **delayed meconium passage** postnatally. *Pyloric stenosis* - Involves hypertrophy of the **pyloric muscle**, leading to gastric outlet obstruction, but it typically presents in infancy with **non-bilious projectile vomiting** and an **olive-shaped mass**, not a double bubble sign antenatally. - The 'double bubble' is specific to obstructions *after* the pylorus, in the duodenum. *Esophageal atresia* - This condition involves a blind-ending esophagus and is often associated with a **tracheoesophageal fistula**, leading to symptoms like **frothing and bubbling at the mouth** and choking during feeds. - While it impacts feeding, it does not cause the characteristic appearance of a **dilated stomach** and duodenum seen in the double bubble sign.
Question 6: A newborn male is noted to have difficulty feeding and "turns blue and chokes when drinking formula." The prenatal records reveal that the amniotic fluid appeared normal on ultrasound. A pediatric feeding tube is passed orally to 20 cm without difficulty, with gastric secretions aspirated. Which of the following is the most likely diagnosis?
- A. Floppy epiglottis
- B. Tracheoesophageal fistula (Correct Answer)
- C. Zenker diverticulum
- D. Congenital heart disease
Explanation: ***Tracheoesophageal fistula*** - The combination of **feeding difficulties**, **cyanosis** ("turns blue"), and **choking** in a newborn, along with the ability to pass a feeding tube to 20 cm, strongly suggests a tracheoesophageal fistula (TEF), specifically a type where the **proximal esophagus ends in a blind pouch and the distal esophagus connects to the trachea**. - The **normal amniotic fluid** on prenatal ultrasound suggests that the fetus was able to swallow amniotic fluid, ruling out esophageal atresia without a fistula as the primary cause of polyhydramnios. Passage of the feeding tube to 20 cm and aspiration of gastric secretions indicates that the stomach is connected to the esophagus, but the reflux of gastric contents during feeding leads to aspiration into the trachea via the fistula. *Floppy epiglottis* - **Laryngomalacia**, or "floppy epiglottis," typically causes **stridor** (a high-pitched inspiratory sound), especially when crying or feeding, which is not the primary symptom described here. - While it can cause some feeding difficulties, **severe cyanosis and recurrent choking** during feeding are more characteristic of aspiration due to a different anatomical defect like TEF. *Zenker diverticulum* - A **Zenker diverticulum is a pharyngoesophageal pouch** that typically causes dysphagia, regurgitation of undigested food, and halitosis, primarily in **older adults**. - It is an acquired condition and **extremely rare in newborns**, making it an unlikely diagnosis for these symptoms in an infant. *Congenital heart disease* - While congenital heart disease can cause **cyanosis and feeding difficulties** due to increased metabolic demand or heart failure, it would not typically present with the specific description of **choking during feeding and successful passing of a feeding tube to the stomach with aspirated gastric secretions**. - The symptoms in this case point more directly to a **problem with the swallowing mechanism or the connection between the esophagus and the trachea**.
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: A pregnant female had meconium-stained liquor and underwent emergency LSCS. A few days later, her condition deteriorated, and an ultrasound showed edematous bowels. What is the most likely cause of her condition?
- A. Adhesive intestinal obstruction
- B. Intra-abdominal abscess
- C. Paralytic ileus (Correct Answer)
- D. Intestinal perforation
Explanation: ***Paralytic ileus*** - **Paralytic ileus**, often called **postoperative ileus**, is a common complication after abdominal surgeries like **LSCS**, especially when associated with complications like meconium-stained liquor. - The combination of **meconium-stained liquor** (indicating fetal distress/inflammation) and **emergency LSCS** increases the risk for a prolonged inflammatory response post-surgery, leading to intestinal paralysis and **edematous bowels**. - Ultrasound findings of **edematous bowels** without signs of mechanical obstruction support this diagnosis. *Adhesive intestinal obstruction* - **Adhesive intestinal obstruction** usually occurs later, weeks to years after surgery, as **adhesions** form and contract. - While possible, it is less likely to present acutely a "few days later" after an initial surgery compared to **paralytic ileus**. *Intra-abdominal abscess* - An **intra-abdominal abscess** would typically cause localized pain, fever, and signs of infection with more focal findings on imaging. - The primary observation of **edematous bowels** points more directly to diffuse bowel dysfunction rather than a localized collection. *Intestinal perforation* - **Intestinal perforation** would present with acute peritonitis, free fluid/air on imaging, severe abdominal pain, and signs of sepsis. - While edematous bowels can be present, the clinical picture would be more dramatic with peritoneal signs rather than the subacute deterioration described here.
Question 9: What is the initial palliative treatment for Tetralogy of Fallot?
- A. Modified BT shunt (Correct Answer)
- B. Waterston shunt
- C. BT shunt
- D. Potts shunt operation
Explanation: **Modified BT shunt** - The **Modified Blalock-Taussig (BT) shunt** is the initial palliative treatment for Tetralogy of Fallot, providing a reliable source of **pulmonary blood flow** in infants with severe cyanosis. - It involves connecting a **systemic artery** (subclavian or brachiocephalic artery) to the **pulmonary artery** using an interposition graft, increasing blood flow to the lungs. *Waterston shunt* - The **Waterston shunt** connects the **ascending aorta** to the **right pulmonary artery**. - It has a higher incidence of **pulmonary artery distortion** and pulmonary hypertension, making it less favorable than the modified BT shunt. *BT shunt* - The classic **Blalock-Taussig shunt** involves a direct anastomosis between the subclavian artery and the pulmonary artery. - While effective, the **Modified BT shunt** using a graft is generally preferred due to less vascular injury and improved long-term patency. *Potts shunt operation* - The **Potts shunt** connects the **descending aorta** to the **left pulmonary artery**. - Similar to the Waterston shunt, it carries a higher risk of **pulmonary artery distortion** and is rarely used today.
Question 10: Biopsy in Hirschsprung's disease can be taken from which level?
- A. 4 cm below dentate line
- B. 6 cm below dentate line
- C. At the level of dentate line
- D. 2-3 cm above the dentate line (Correct Answer)
Explanation: ***2-3 cm above the dentate line*** - This is the **standard recommended site** for rectal suction biopsy in suspected Hirschsprung's disease - At this level, the biopsy reliably samples the **aganglionic segment** in most cases while avoiding the physiologically hypoganglionated zone near the dentate line - Adequate depth to examine both **submucosal and myenteric plexuses** for absence of ganglion cells - High diagnostic accuracy with minimal risk of false negatives *4 cm below dentate line* - This is **anatomically incorrect** - you cannot biopsy "below" the dentate line as this would be perianal skin, not rectal mucosa - The dentate line marks the junction between the anal canal and perianal region - This option represents an impossible biopsy location *6 cm below dentate line* - Similarly **anatomically impossible** - there is no bowel tissue 6 cm below the dentate line - This would be well outside the anal canal in the perianal skin - Not a valid biopsy site for Hirschsprung's diagnosis *At the level of dentate line* - This location is **too low** and within the physiologically hypoganglionated zone - The dentate line area normally has sparse ganglion cells even in healthy individuals - Biopsies at this level have **high false-positive rates** (may appear aganglionic when disease is not present) - Risk of sampling the internal anal sphincter, causing complications
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