Necrotizing enterocolitis US Medical PG Practice Questions and MCQs
Practice US Medical PG questions for Necrotizing enterocolitis. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Necrotizing enterocolitis US Medical PG Question 1: A four-week-old female is evaluated in the neonatal intensive care unit for feeding intolerance with gastric retention of formula. She was born at 25 weeks gestation to a 32-year-old gravida 1 due to preterm premature rupture of membranes at 24 weeks gestation. The patient’s birth weight was 750 g (1 lb 10 oz). She required resuscitation with mechanical ventilation at the time of delivery, but she was subsequently extubated to continuous positive airway pressure (CPAP) and then weaned to nasal cannula. The patient was initially receiving both parenteral nutrition and enteral feeds through a nasogastric tube, but she is now receiving only continuous nasogastric formula feeds. Her feeds are being advanced to a target weight gain of 20-30 g per day. Her current weight is 1,350 g (2 lb 16 oz). The patient’s temperature is 97.2°F (36.2°C), blood pressure is 72/54 mmHg, pulse is 138/min, respirations are 26/min, and SpO2 is 96% on 4L nasal cannula. On physical exam, the patient appears lethargic. Her abdomen is soft and markedly distended. Digital rectal exam reveals stool streaked with blood in the rectal vault.
Which of the following abdominal radiographs would most likely be seen in this patient?
- A. Air in the biliary tree
- B. Normal bowel gas pattern
- C. Dilated loops of bowel
- D. Pneumoperitoneum
- E. Pneumatosis intestinalis (Correct Answer)
Necrotizing enterocolitis Explanation: ***Pneumatosis intestinalis***
- The patient's presentation with **feeding intolerance**, **abdominal distension**, **lethargy**, and **bloody stools** in a premature infant is highly suspicious for **necrotizing enterocolitis (NEC)**.
- **Pneumatosis intestinalis**, which is gas within the bowel wall, is the **pathognomonic radiographic sign of NEC**. The image clearly shows intramural gas (black arrows and white arrows with arrowheads point to gas within the bowel wall), which is indicative of this condition.
*Air in the biliary tree*
- Air in the biliary tree (pneumobilia) is typically associated with conditions such as a **gallstone ileus**, surgical anastomosis (e.g., choledochojejunostomy), or an incompetent sphincter of Oddi, none of which are indicated by the patient's symptoms or risk factors.
- While it's an abnormal finding, it does not directly explain the clinical picture of a premature infant with feeding intolerance and bloody stools, which strongly points to NEC.
*Normal bowel gas pattern*
- The patient presents with significant symptoms including **marked abdominal distension**, **lethargy**, **feeding intolerance**, and **bloody stools**. A normal bowel gas pattern would be inconsistent with these severe clinical signs.
- In a premature infant with suspected NEC, a normal study is possible early in the disease but usually progresses to show signs of bowel pathology.
*Dilated loops of bowel*
- While **dilated bowel loops** can be seen in NEC, they are a non-specific finding and can occur in various conditions causing **bowel obstruction** or ileus.
- **Pneumatosis intestinalis** is a more specific and advanced radiographic sign of NEC, indicating gas produced by bacteria invading the bowel wall, and is therefore a more definitive finding for this condition.
*Pneumoperitoneum*
- **Pneumoperitoneum**, or free air in the abdomen, indicates **bowel perforation**, which is a severe complication of necrotizing enterocolitis.
- While NEC can lead to pneumoperitoneum, the image provided shows gas *within* the bowel wall (pneumatosis), not free air *outside* the bowel. Pneumoperitoneum would typically manifest as air under the diaphragm on an upright film or a Football sign on a supine film.
Necrotizing enterocolitis US Medical PG Question 2: A 47-year-old woman presents to the emergency department with abdominal pain. The patient states that she felt this pain come on during dinner last night. Since then, she has felt bloated, constipated, and has been vomiting. Her current medications include metformin, insulin, levothyroxine, and ibuprofen. Her temperature is 99.0°F (37.2°C), blood pressure is 139/79 mmHg, pulse is 95/min, respirations are 12/min, and oxygen saturation is 98% on room air. On physical exam, the patient appears uncomfortable. Abdominal exam is notable for hypoactive bowel sounds, abdominal distension, and diffuse tenderness in all four quadrants. Cardiac and pulmonary exams are within normal limits. Which of the following is the best next step in management?
- A. Metoclopramide
- B. Nasogastric tube, NPO, and IV fluids (Correct Answer)
- C. Stool guaiac
- D. Emergency surgery
- E. IV antibiotics and steroids
Necrotizing enterocolitis Explanation: ***Nasogastric tube, NPO, and IV fluids***
- The patient's symptoms (abdominal pain, bloating, constipation, vomiting, distension, and hypoactive bowel sounds) are highly suggestive of a **bowel obstruction**.
- **Nasogastric tube decompression** relieves pressure, **NPO status** prevents further bowel distension, and **intravenous fluids** address dehydration and electrolyte imbalances, stabilizing the patient for further evaluation.
*Metoclopramide*
- This is a **prokinetic agent** that increases gastrointestinal motility.
- Using it in the context of a suspected bowel obstruction could worsen the condition by increasing pressure against the obstruction and potentially leading to **perforation**.
*Stool guaiac*
- A stool guaiac test detects the presence of **occult blood in the stool**, which is useful for evaluating gastrointestinal bleeding.
- While it can be part of a complete workup, it is not the immediate priority for a patient presenting with symptoms of **acute bowel obstruction** requiring stabilization.
*Emergency surgery*
- While surgery may ultimately be required for a bowel obstruction, it is not the immediate first step unless there are clear signs of **perforation**, **ischemia**, or **strangulation**, which are not specified here.
- Initial management involves **stabilization** with NG decompression, NPO, and IV fluids.
*IV antibiotics and steroids*
- **IV antibiotics** are indicated for suspected infection (e.g., appendicitis, diverticulitis with perforation), but the primary presentation here is mechanical obstruction, not infection.
- **Steroids** are typically used for inflammatory conditions or adrenal insufficiency, neither of which is indicated given the patient's symptoms.
Necrotizing enterocolitis US Medical PG Question 3: A 32-year-old man is brought to the emergency department after a skiing accident. The patient had been skiing down the mountain when he collided with another skier who had stopped suddenly in front of him. He is alert but complaining of pain in his chest and abdomen. He has a past medical history of intravenous drug use and peptic ulcer disease. He is a current smoker. His temperature is 97.4°F (36.3°C), blood pressure is 77/53 mmHg, pulse is 127/min, and respirations are 13/min. He has a GCS of 15 and bilateral shallow breath sounds. His abdomen is soft and distended with bruising over the epigastrium. He is moving all four extremities and has scattered lacerations on his face. His skin is cool and delayed capillary refill is present. Two large-bore IVs are placed in his antecubital fossa, and he is given 2L of normal saline. His FAST exam reveals fluid in Morison's pouch. Following the 2L normal saline, his temperature is 97.5°F (36.4°C), blood pressure is 97/62 mmHg, pulse is 115/min, and respirations are 12/min.
Which of the following is the best next step in management?
- A. Diagnostic peritoneal lavage
- B. Emergency laparotomy (Correct Answer)
- C. Upper gastrointestinal endoscopy
- D. Close observation
- E. Diagnostic laparoscopy
Necrotizing enterocolitis Explanation: ***Emergency laparotomy***
- The patient remains **hemodynamically unstable** (BP 97/62 mmHg, HR 115/min after 2L IV fluids) with evidence of **intra-abdominal fluid on FAST exam** (fluid in Morison's pouch).
- This clinical picture indicates active intra-abdominal hemorrhage requiring **immediate surgical intervention** to identify and control the source of bleeding.
*Diagnostic peritoneal lavage*
- **Diagnostic peritoneal lavage (DPL)** has largely been replaced by the focused abdominal sonography for trauma (FAST) exam and CT scans.
- While it can detect intra-abdominal bleeding, it is **invasive** and would delay definitive treatment in a hemodynamically unstable patient with positive FAST.
*Upper gastrointestinal endoscopy*
- This procedure is primarily for diagnosing and treating **upper gastrointestinal bleeding** or mucosal abnormalities.
- It is **not indicated** for evaluating traumatic intra-abdominal hemorrhage or hemodynamic instability following blunt abdominal trauma.
*Close observation*
- Close observation is appropriate for **hemodynamically stable patients** with blunt abdominal trauma and minor injuries or equivocal findings.
- This patient's persistent hypotension, tachycardia, and positive FAST findings rule out observation as a safe or appropriate next step.
*Diagnostic laparoscopy*
- **Diagnostic laparoscopy** is a minimally invasive surgical procedure used to evaluate the abdominal cavity.
- While it can be diagnostic, it is generally **contraindicated in hemodynamically unstable patients** as it can prolong the time to definitive hemorrhage control if a major injury is found.
Necrotizing enterocolitis US Medical PG Question 4: A 28-year-old male presents to his primary care physician with complaints of intermittent abdominal pain and alternating bouts of constipation and diarrhea. His medical chart is not significant for any past medical problems or prior surgeries. He is not prescribed any current medications. Which of the following questions would be the most useful next question in eliciting further history from this patient?
- A. "Does the diarrhea typically precede the constipation, or vice-versa?"
- B. "Is the diarrhea foul-smelling?"
- C. "Please rate your abdominal pain on a scale of 1-10, with 10 being the worst pain of your life"
- D. "Are the symptoms worse in the morning or at night?"
- E. "Can you tell me more about the symptoms you have been experiencing?" (Correct Answer)
Necrotizing enterocolitis Explanation: ***Can you tell me more about the symptoms you have been experiencing?***
- This **open-ended question** encourages the patient to provide a **comprehensive narrative** of their symptoms, including details about onset, frequency, duration, alleviating/aggravating factors, and associated symptoms, which is crucial for diagnosis.
- In a patient presenting with vague, intermittent symptoms like alternating constipation and diarrhea, allowing them to elaborate freely can reveal important clues that might not be captured by more targeted questions.
*Does the diarrhea typically precede the constipation, or vice-versa?*
- While knowing the sequence of symptoms can be helpful in understanding the **pattern of bowel dysfunction**, it is a very specific question that might overlook other important aspects of the patient's experience.
- It prematurely narrows the focus without first obtaining a broad understanding of the patient's overall symptomatic picture.
*Is the diarrhea foul-smelling?*
- Foul-smelling diarrhea can indicate **malabsorption** or **bacterial overgrowth**, which are important to consider in some gastrointestinal conditions.
- However, this is a **specific symptom inquiry** that should follow a more general exploration of the patient's symptoms, as it may not be relevant if other crucial details are missed.
*Please rate your abdominal pain on a scale of 1-10, with 10 being the worst pain of your life*
- Quantifying pain intensity is useful for assessing the **severity of discomfort** and monitoring changes over time.
- However, for a patient with intermittent rather than acute, severe pain, understanding the **character, location, and triggers** of the pain is often more diagnostically valuable than just a numerical rating initially.
*Are the symptoms worse in the morning or at night?*
- Diurnal variation can be relevant in certain conditions, such as inflammatory bowel diseases where nocturnal symptoms might be more concerning, or functional disorders whose symptoms might be stress-related.
- This is another **specific question** that should come after gathering a more complete initial picture of the patient's symptoms to ensure no key information is overlooked.
Necrotizing enterocolitis US Medical PG Question 5: A 16-month-old male patient, with no significant past medical history, is brought into the emergency department for the second time in 5 days with tachypnea, expiratory wheezes and hypoxia. The patient presented to the emergency department initially due to rhinorrhea, fever and cough. He was treated with nasal suctioning and discharged home. The mother states that, over the past 5 days, the patient has started breathing faster with chest retractions. His vital signs are significant for a temperature of 100.7 F, respiratory rate of 45 and oxygen saturation of 90%. What is the most appropriate treatment for this patient?
- A. Albuterol, ipratropium and IV methylprednisolone
- B. IV cefotaxime and IV vancomycin
- C. Intubation and IV cefuroxime
- D. Humidified oxygen, racemic epinephrine and intravenous (IV) dexamethasone
- E. Nasal suctioning, oxygen therapy and IV fluids (Correct Answer)
Necrotizing enterocolitis Explanation: ***Nasal suctioning, oxygen therapy and IV fluids***
- This patient's presentation with rhinorrhea, fever, cough, tachypnea, expiratory wheezes, and hypoxia, particularly a 16-month-old, strongly suggests **bronchiolitis**, likely caused by **RSV**.
- Management of bronchiolitis is primarily **supportive care**, including maintaining airway patency via nasal suctioning, providing oxygen for hypoxia, and ensuring adequate hydration with IV fluids.
*Albuterol, ipratropium and IV methylprednisolone*
- **Bronchodilators** like albuterol and ipratropium are generally **not recommended** for routine management of bronchiolitis due to lack of consistent efficacy in infants.
- **Corticosteroids** (e.g., methylprednisolone) are also **not routinely indicated** for bronchiolitis and have not been shown to improve outcomes.
*IV cefotaxime and IV vancomycin*
- These are **broad-spectrum antibiotics** used to treat **bacterial infections**, such as severe pneumonia or sepsis.
- The clinical presentation is more consistent with a **viral respiratory infection** (bronchiolitis), and there is no evidence of a bacterial co-infection or sepsis.
*Intubation and IV cefuroxime*
- **Intubation** is an invasive procedure reserved for patients with impending respiratory failure and is not indicated at this stage given the current oxygen saturation of 90% with supportive measures.
- **Cefuroxime** is an antibiotic, and like other antibiotics, is not indicated for a viral illness like bronchiolitis.
*Humidified oxygen, racemic epinephrine and intravenous (IV) dexamethasone*
- **Racemic epinephrine** may be considered for severe bronchiolitis with significant bronchospasm, but its use is not routine and its efficacy is debated.
- **IV dexamethasone** is a corticosteroid, which is not recommended for routine bronchiolitis management. Humidified oxygen is helpful, but the overall regimen is not standard for bronchiolitis.
Necrotizing enterocolitis US Medical PG Question 6: A 3500-g (7.7-lbs) girl is delivered at 39 weeks' gestation to a 27-year-old woman, gravida 2, para 1. Apgar scores are 8 and 9 at 1 and 5 minutes, respectively. The mother had regular prenatal visits throughout the pregnancy. She did not smoke or drink alcohol. She took multivitamins as prescribed by her physician. The newborn appears active. The girl's temperature is 37°C (98.6°F), pulse is 120/min, and blood pressure is 55/35 mm Hg. Examination in the delivery room shows clitoromegaly. One day later, laboratory studies show:
Hemoglobin 12.8 g/dL
Leukocyte count 6,000/mm3
Platelet count 240,000/mm3
Serum
Na+ 133 mEq/L
K+ 5.2 mEq/L
Cl− 101 mEq/L
HCO3− 21 mEq/L
Urea nitrogen 15 mg/dL
Creatinine 0.8 mg/dL
Ultrasound of the abdomen and pelvis shows normal uterus and normal ovaries. Which of the following is the most appropriate next step in the management of this newborn patient?
- A. Spironolactone therapy
- B. Estrogen replacement therapy
- C. Dexamethasone therapy
- D. Genital reconstruction surgery
- E. Hydrocortisone and fludrocortisone therapy (Correct Answer)
Necrotizing enterocolitis Explanation: ***Hydrocortisone and fludrocortisone therapy***
- The newborn presents with **clitoromegaly** and electrolyte abnormalities including **hyponatremia** and **hyperkalemia**, which are characteristic findings of **salt-wasting congenital adrenal hyperplasia (CAH)**.
- CAH is caused by a deficiency in 21-hydroxylase enzyme, leading to inadequate production of cortisol and aldosterone. **Hydrocortisone** (glucocorticoid) and **fludrocortisone** (mineralocorticoid) are essential for replacing these deficient hormones and preventing adrenal crisis.
*Spironolactone therapy*
- **Spironolactone** is an **aldosterone antagonist** and would worsen the existing salt-wasting state and hyperkalemia seen in CAH.
- It works by blocking aldosterone, leading to increased sodium excretion and potassium retention, which is the opposite of what is needed in CAH.
*Estrogen replacement therapy*
- **Estrogen replacement therapy** is not indicated at this stage. It would not address the underlying hormonal deficiencies (cortisol and aldosterone) or correct the electrolyte imbalances in CAH.
- Estrogen is involved in female sexual development but does not play a primary role in the acute management of adrenal insufficiency in newborns with CAH.
*Dexamethasone therapy*
- **Dexamethasone** is a potent **glucocorticoid**, but it is generally not the first-line treatment for chronic management in infants with CAH due to its prolonged half-life and higher risk of growth suppression compared to hydrocortisone.
- While it could address the cortisol deficiency, it does not provide mineralocorticoid activity, which is crucial for managing the salt-wasting component.
*Genital reconstruction surgery*
- **Genital reconstruction surgery** may be considered later in life for cosmetic or functional reasons, but it is not the immediate or most appropriate next step in managing a newborn with CAH.
- The immediate priority is to stabilize the child's hormonal and electrolyte balance to prevent potentially life-threatening adrenal crisis.
Necrotizing enterocolitis US Medical PG Question 7: A 4-week-old male presents with his parents to the pediatrician for a well-child visit. The patient’s mother reports that the patient was eating well until about one week ago, when he began vomiting after breastfeeding. His mother has tried increasing the frequency of feeds and decreasing the amount of each feed, but the vomiting seems to be getting worse. The patient now vomits after every feed. His mother states the vomitus looks like breastmilk. The patient’s mother is exclusively breastfeeding and would prefer not to switch to formula but worries that the patient is not getting the nutrition he needs. Two weeks ago, the patient was in the 75th percentile for weight and 70th for height. He is now in the 60th percentile for weight and 68th percentile for height. On physical exam, the patient has dry mucous membranes. His abdomen is soft and non-distended.
Which of the following is the best next step in management?
- A. Abdominal radiograph
- B. Trial of empiric proton pump inhibitor
- C. Supplement breastfeeding with formula
- D. Abdominal ultrasound (Correct Answer)
- E. Trial of cow's milk-free diet
Necrotizing enterocolitis Explanation: ***Abdominal ultrasound***
- The history of **progressive non-bilious vomiting** after every feed, worsening over time, and **weight percentile drop** in a 4-week-old infant strongly suggests **pyloric stenosis**. The best next step for diagnosis is an abdominal ultrasound which can visualize the thickened pylorus (>3-4 mm muscle thickness, >14-16 mm channel length).
- The physical exam finding of **dry mucous membranes** indicates dehydration, a common complication of recurrent vomiting.
*Abdominal radiograph*
- An abdominal radiograph is generally not the initial imaging of choice for diagnosing pyloric stenosis, as it is less sensitive and specific than ultrasound for visualizing soft tissue structures like the pylorus.
- While it may show a **dilated stomach** or **absent gas in the distal bowel**, these findings are not diagnostic of pyloric stenosis and do not pinpoint the obstruction.
*Trial of empiric proton pump inhibitor*
- A proton pump inhibitor would be considered for **gastroesophageal reflux disease (GERD)**, but the **worsening pattern of vomiting after every feed** and **rapid weight loss** are atypical for simple GERD and point to a more serious mechanical obstruction.
- Treating with a PPI would delay the proper diagnosis and treatment of pyloric stenosis, which requires surgical intervention (pyloromyotomy).
*Supplement breastfeeding with formula*
- While ensuring adequate nutrition is important, simply supplementing with formula will not resolve the underlying issue of **pyloric obstruction**, and the infant will likely continue to vomit and experience dehydration.
- This approach would delay definitive diagnosis and treatment, potentially leading to further compromise of the infant's health.
*Trial of cow's milk-free diet*
- A cow's milk-free diet is indicated for suspected **cow's milk protein allergy (CMPA)**, which can present with vomiting, but typically also includes symptoms like **bloody stools**, **eczema**, or **colic**, which are not reported here.
- The **progressive non-bilious vomiting after every feed** and rapid weight loss are more characteristic of a mechanical obstruction like pyloric stenosis than a dietary allergy.
Necrotizing enterocolitis US Medical PG Question 8: A 6-month-old boy is brought to the emergency department by his mother, who informs the doctor that her alcoholic husband hit the boy hard on his back. The blow was followed by excessive crying for several minutes and the development of redness in the area. On physical examination, the boy is dehydrated, dirty, and irritable and when the vital signs are checked, they reveal tachycardia. He cries immediately upon the physician touching the area around his left scapula. The doctor strongly suspects a fracture of the 6th, 7th, or 8th retroscapular posterior ribs. Evaluation of his skeletal survey is normal. The clinician is concerned about child abuse in this case. Which of the following is the most preferred imaging technique as the next step in the diagnostic evaluation of the infant?
- A. Bedside ultrasonography
- B. Magnetic resonance imaging
- C. Babygram
- D. Chest computed tomography scan
- E. Skeletal survey in 2 weeks (Correct Answer)
Necrotizing enterocolitis Explanation: ***Skeletal survey in 2 weeks***
- A repeat **skeletal survey in 2 weeks** is the most appropriate next step in suspected child abuse cases with an initial normal survey, as it allows for the detection of **healing fractures** that may not be apparent immediately after injury.
- New bone formation and callus development around a fracture site become radiographically visible after approximately 7 to 14 days, improving the detection rate of subtle or undisplaced fractures.
*Bedside ultrasonography*
- While **ultrasonography** can detect acute fractures, especially in cartilage and non-ossified bones, its utility in a comprehensive assessment for multiple non-displaced rib fractures as part of a child abuse workup is limited.
- It is highly **operator-dependent** and may not provide the full skeletal overview required in suspected child abuse.
*Magnetic resonance imaging*
- **MRI** is excellent for evaluating soft tissue injuries, bone marrow edema, and non-ossified cartilaginous structures. However, it is not the primary imaging modality for detecting acute or subacute fractures of ossified bone and requires **sedation** in infants, making it less practical for routine skeletal screening.
- The **high cost** and limited availability of MRI also make it less suitable as a first-line diagnostic tool for rib fractures in this context.
*Babygram*
- A **babygram** is a single large radiograph of an infant's entire body, often used to rapidly assess for gross developmental anomalies or immediate concerns.
- It provides **less detailed imaging** of individual bones compared to a standard skeletal survey and is insufficient for reliably detecting subtle or non-displaced rib fractures.
*Chest computed tomography scan*
- A **chest CT scan** is highly sensitive for detecting acute rib fractures, even subtle ones. However, it exposes the infant to **significant radiation** and is usually reserved for specific clinical indications, such as suspected internal organ injury, rather than as a primary screening tool for rib fractures in child abuse in an otherwise stable patient.
- It does not provide a comprehensive view of the entire skeleton, which is crucial for identifying other potential abuse-related injuries elsewhere.
Necrotizing enterocolitis US Medical PG Question 9: An 18-month-old boy is brought to the physician by his parents for the evaluation of passing large amounts of dark red blood from his rectum for 2 days. His parents noticed that he has also had several episodes of dark stools over the past 3 weeks. The parents report that their child has been sleeping more and has been more pale than usual over the past 24 hours. The boy's appetite has been normal and he has not vomited. He is at the 50th percentile for height and 50th percentile for weight. His temperature is 37°C (98.6°F), pulse is 135/min, respirations are 38/min, and blood pressure is 90/50 mm Hg. Examination shows pale conjunctivae. The abdomen is soft and nontender. There is a small amount of dark red blood in the diaper. Laboratory studies show:
Hemoglobin 9.5 g/dL
Hematocrit 30%
Mean corpuscular volume 68 μm3
Leukocyte count 7,200/mm3
Platelet count 300,000/mm3
Which of the following is most likely to confirm the diagnosis?
- A. Colonoscopy
- B. Water-soluble contrast enema
- C. Technetium-99m pertechnetate scan (Correct Answer)
- D. Esophagogastroduodenoscopy
- E. Plain abdominal x-ray
Necrotizing enterocolitis Explanation: **Technetium-99m pertechnetate scan**
- The presentation of painless **dark red rectal bleeding** in a toddler, coupled with signs of **anemia** (pale conjunctivae, hemoglobin 9.5 g/dL, MCV 68 μm³), strongly suggests a **Meckel's diverticulum** with ectopic gastric mucosa.
- A **Technetium-99m pertechnetate scan** specifically detects **ectopic gastric mucosa**, which is the most common cause of bleeding in a Meckel's diverticulum, making it the definitive diagnostic test.
*Colonoscopy*
- While useful for evaluating lower gastrointestinal bleeding, a **colonoscopy** is less likely to detect a Meckel's diverticulum, which often lies beyond the reach of a standard colonoscope.
- It involves more invasive preparation and carries higher risks for a young child compared to a nuclear scan for this specific suspicion.
*Water-soluble contrast enema*
- A **water-soluble contrast enema** is primarily used to diagnose conditions like intussusception or colonic obstructions by visualizing the bowel lumen.
- It is unlikely to visualize a Meckel's diverticulum or identify the bleeding source directly, especially one involving ectopic gastric mucosa.
*Esophagogastroduodenoscopy*
- An **esophagogastroduodenoscopy (EGD)** evaluates the upper gastrointestinal tract (esophagus, stomach, duodenum).
- The symptom of **dark red rectal bleeding** indicates a lower GI source, making an EGD a less appropriate initial diagnostic step.
*Plain abdominal x-ray*
- A **plain abdominal x-ray** is useful for identifying bowel obstruction, perforation, or foreign bodies, but it does not directly visualize or diagnose causes of GI bleeding like a Meckel's diverticulum.
- It provides limited information regarding the source of internal bleeding or the presence of anomalous tissue.
Necrotizing enterocolitis US Medical PG Question 10: Vitamin K supplementation is given to neonates to prevent _____ .
- A. Hemorrhagic disease of the newborn (Correct Answer)
- B. Scurvy
- C. Keratomalacia
- D. Breast milk jaundice
- E. Rickets
Necrotizing enterocolitis Explanation: ***Hemorrhagic disease of the newborn***
- Neonates have low levels of **vitamin K-dependent clotting factors** (II, VII, IX, X) due to poor placental transfer, sterile gut, and low vitamin K in breast milk.
- Vitamin K supplementation at birth prevents potentially life-threatening bleeding episodes, known as **hemorrhagic disease of the newborn (VKDB)**, by ensuring adequate clotting factor production.
*Scurvy*
- Scurvy is caused by **vitamin C deficiency**, leading to impaired collagen synthesis.
- Symptoms include **gingival bleeding**, skin hemorrhages, and poor wound healing, which are distinct from vitamin K deficiency.
*Keratomalacia*
- Keratomalacia is a severe eye condition resulting from **vitamin A deficiency**, characterized by drying and clouding of the cornea.
- It leads to **blindness** and is not related to vitamin K metabolism.
*Breast milk jaundice*
- Breast milk jaundice is a common and usually benign condition in neonates where **breast milk components** interfere with bilirubin metabolism, prolonging physiological jaundice.
- It is not prevented by vitamin K and is entirely distinct from coagulation disorders.
*Rickets*
- Rickets is caused by **vitamin D deficiency**, resulting in defective bone mineralization and skeletal deformities.
- Clinical features include **bowed legs**, rachitic rosary, and delayed fontanelle closure, which are unrelated to coagulation or vitamin K.
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