CCRN-NEONATAL CCRN (Neonatal) - Direct Care Eligibility Pathway Practice Questions
Prepare for CCRN-NEONATAL with more than an answer.
- 1
In an infant of a diabetic mother (IDM) exhibiting macrosomia and plethora, the primary endocrine alteration causing precipitous early postnatal _____ is persistent pancreatic beta-cell hyperplasia driving severe hyperinsulinism once the continuous maternal glucose source is severed.
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Correct answer: B
Maternal hyperglycemia triggers fetal hyperinsulinemia and beta-cell hypertrophy. At birth, maternal glucose delivery abruptly stops while hyperinsulinism persists, leading to rapid hypoglycemia.
- 2
A 27-week preterm infant weighing 920 g is on day of life 14 receiving fortified maternal breast milk at 130 mL/kg/day via an orogastric feeding tube. During morning assessment, the nurse discovers a 3 cm increase in abdominal girth from baseline, absent bowel sounds, visible bluish discoloration of the periumbilical region, and 4 mL of dark bilious aspirate prior to the scheduled feeding.
Vital signs demonstrate a temperature of 35.8°C, heart rate of 188 bpm, blood pressure of 46/24 mmHg, and SpO2 of 89% on baseline CPAP. The infant appears mottled, lethargic, and displays frequent apnea and bradycardia episodes requiring tactile stimulation.
An urgent anterior-posterior and left lateral decubitus abdominal radiograph series is performed. Which radiographic finding serves as the hallmark, pathognomonic sign confirming necrotizing enterocolitis (NEC)?
flowchart TD FeedIntol[Abdominal Distension & Feeding Intolerance] --> Eval{Diagnostic Workup} Eval --> Xray[Abdominal Radiography] Xray --> Pneumo[Pneumatosis Intestinalis Identified] Pneumo --> Action[Decompress Stomach + NPO + Broad-Spectrum Antibiotics]Show answer details
Correct answer: D
Pneumatosis intestinalis represents intramural hydrogen gas produced by invading enteric bacteria fermenting luminal carbohydrates. It is the diagnostic hallmark of necrotizing enterocolitis.
- 3
Following the clinical diagnosis of suspected necrotizing enterocolitis (NEC) in a preterm neonate, what is the critical initial nursing priority to arrest disease progression and protect intestinal perfusion?
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Correct answer: B
Immediate medical management of NEC requires complete bowel rest (NPO), effective gastric decompression to relieve intraluminal pressure, obtaining blood cultures, and starting parenteral broad-spectrum antibiotics.
- 4
A 24-week gestational age neonate on postnatal day 4 begins to exhibit increased work of breathing, bounding brachial pulses, and a hyperdynamic precordium. The bedside nurse notes the infant's blood pressure is 54/22 mmHg (mean arterial pressure 31 mmHg) with an echocardiogram revealing a large left-to-right shunt across the ductus arteriosus. Which pathophysiological mechanism directly accounts for this infant's widened pulse pressure?
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Correct answer: C
Large left-to-right ductal shunts cause pulmonary overcirculation. Diastolic run-off from the aorta into the low-pressure pulmonary vascular bed depresses diastolic blood pressure, producing a widened pulse pressure and bounding pulses.
- 5
A full-term infant delivered via emergent cesarean section for non-reassuring fetal heart tones presents at 3 hours of life with marked central cyanosis, tachypnea, and grunting. The infant is placed on an oxygen hood with 100% FiO2.
Simultaneous arterial blood gas analysis reveals a pre-ductal (right radial) PaO2 of 88 mmHg and a post-ductal (umbilical arterial catheter) PaO2 of 44 mmHg. Pre-ductal pulse oximetry shows 94% on the right wrist, while post-ductal pulse oximetry displays 81% on the left foot. An echocardiogram is urgently ordered to rule out congenital heart defects.
Which physiological diagnosis is most consistently supported by this pre- and post-ductal oxygenation gradient?
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Correct answer: D
A pre- to post-ductal SpO2 gradient >=10% or PaO2 difference >15-20 mmHg indicates unoxygenated blood shunting right-to-left across a patent ductus arteriosus into the descending aorta, classic for PPHN.
- 6
A 2-day-old term infant with unrecognized critical aortic coarctation undergoes acute spontaneous functional closure of the ductus arteriosus. Which TWO clinical findings indicate systemic hypoperfusion resulting from this ductal closure? (Select TWO)
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Correct answer: B, E
Ductal closure in critical aortic coarctation abruptly obstructs descending aortic flow, causing diminished or absent femoral pulses and lower extremity hypotension.
Loss of ductal patency severely reduces systemic perfusion to the kidneys and visceral organs, rapidly causing tissue hypoxia, profound lactic acidosis, and oliguria.
