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Zorluk: OrtaNeonatal Disorders

A 1212-day-old male neonate, born prematurely at 2929 weeks gestation, is being evaluated in the neonatal intensive care unit for acute clinical deterioration. His birth weight was 1,150 g1,150\text{ g}. Apgar scores were 66 and 88 at 11 and 55 minutes, respectively. Over the past week, he has been gradually transitioning to full enteral feeds via an orogastric tube. Over the last 88 hours, the nursing staff has noted increased gastric residuals, new-onset lethargy, and one episode of bilious emesis.

Current vital signs are:
Temperature: 35.6∘C35.6^\circ\text{C} (96.1∘F96.1^\circ\text{F})
Heart rate: 178 /min178\text{ /min}
Respiratory rate: 65 /min65\text{ /min}
Blood pressure: 48/28 mm Hg48/28\text{ mm Hg}

On physical examination, the neonate appears mottled and lethargic. The abdomen is tensely distended, tender to palpation, and exhibits fixed overlying erythema. Bowel sounds are absent.

Laboratory evaluation reveals the following:

Laboratory TestResultReference Range
Leukocyte count3,500 /mm33,500\text{ /mm}^39,000−30,000 /mm39,000 - 30,000\text{ /mm}^3
Band forms30%30\%0−5%0 - 5\%
Platelet count80,000 /mm380,000\text{ /mm}^3150,000−400,000 /mm3150,000 - 400,000\text{ /mm}^3
Arterial pH7.227.227.35−7.457.35 - 7.45
pCO2_248 mm Hg48\text{ mm Hg}35−45 mm Hg35 - 45\text{ mm Hg}
Bicarbonate15 mEq/L15\text{ mEq/L}22−28 mEq/L22 - 28\text{ mEq/L}
Lactate4.8 mmol/L4.8\text{ mmol/L}0.5−2.2 mmol/L0.5 - 2.2\text{ mmol/L}

A plain anteroposterior abdominal radiograph demonstrates dilated bowel loops, intramural air (pneumatosis intestinalis), and branching lucencies over the hepatic shadow. There is no free intraperitoneal air observed.

Which of the following is the most appropriate next step in management?

  1. Discontinue enteral feeds, begin gastric decompression, and administer intravenous broad-spectrum antibioticsCevap
  2. B
    Consult pediatric surgery for immediate exploratory laparotomy and bowel resection
  3. C
    Administer oral erythromycin and wait for blood culture results before initiating intravenous antibiotics
  4. D
    Order a fluoroscopic upper gastrointestinal contrast series
  5. E
    Apply a topical corticosteroid cream to the abdominal wall

Cevap

Discontinue enteral feeds, begin gastric decompression, and administer intravenous broad-spectrum antibiotics
This premature neonate presents with classic signs of Necrotizing Enterocolitis (NEC), including feeding intolerance (increased residuals, bilious emesis), temperature instability, and lethargy. The pathognomonic radiographic findings of pneumatosis intestinalis (gas within the bowel wall) and portal venous gas confirm the diagnosis. Abdominal wall erythema, thrombocytopenia, and metabolic acidosis indicate advanced disease. However, because there is no free intraperitoneal air (which would indicate frank bowel perforation), the immediate next best step is aggressive medical management. This includes discontinuing enteral feeds to provide complete bowel rest, placing an orogastric tube for gastric decompression, obtaining blood cultures, and initiating broad-spectrum intravenous antibiotics. Intravenous fluid resuscitation and cardiovascular support are also critical initial steps.

Adım Adım Çözüm

1
Analyze the patient's history and vital signs.
The patient is a premature neonate with increasing gastric residuals, bilious emesis, lethargy, hypothermia, and hemodynamic instability (hypotension, tachycardia).
To identify signs of systemic inflammatory response and neonatal sepsis, which are hallmarks of severe abdominal pathology in premature infants.
2
Evaluate the physical examination and laboratory findings.
Physical exam shows a distended, tender abdomen with fixed overlying erythema. Labs indicate leukopenia with a left shift, severe thrombocytopenia, and metabolic acidosis.
Abdominal wall erythema and severe lab derangements suggest underlying peritonitis, while thrombocytopenia is a strong indicator of advancing bowel necrosis.
3
Interpret the abdominal radiograph.
The radiograph shows dilated bowel loops, pneumatosis intestinalis (intramural air), and portal venous gas, but NO free intraperitoneal air.
Pneumatosis intestinalis is the pathognomonic finding for Necrotizing Enterocolitis (NEC).
4
Determine the appropriate management based on the stage of NEC.
The patient has advanced NEC (Stage IIB or IIIA) but without frank perforation (Stage IIIB), which means immediate surgical laparotomy is not the first step. The priority is medical stabilization.
Initial management for non-perforated NEC consists of strict bowel rest, gastric decompression (orogastric tube), broad-spectrum intravenous antibiotics, and aggressive fluid resuscitation.

Anahtar Kavram

Diagnosis and initial medical management of Necrotizing Enterocolitis (NEC) in premature neonates.
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Konular

Neonatal Disorders

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