Neonatal Disorders

A female neonate is delivered at 32 weeks and 4 days of gestation to a 24-year-old primigravida due to preterm labor and rupture of membranes 12 hours prior to delivery. Her birth weight is 1750 g. Apgar scores are 6 and 7 at 1 and 5 minutes, respectively. In the delivery room, the infant exhibits mild grunting and tachypnea, and is subsequently transferred to the neonatal intensive care unit on nasal continuous positive airway pressure (CPAP) at $5 \text{ cm H}_2\text{O}$ with a fractional inspired oxygen ($\text{FiO}_2$) of $0.30$.

At 6 hours of life, the infant's work of breathing markedly increases. Vital signs show a temperature of 36.8°C, heart rate of 175/min, respiratory rate of 88/min, and oxygen saturation of 86% despite escalating the $\text{FiO}_2$ to $0.70$. Physical examination reveals severe subcostal retractions, expiratory grunting, and a scattered rash consisting of 1- to 2-mm pustules on an erythematous base on the chest and back. A chest radiograph demonstrates low lung volumes with diffuse, bilateral reticulogranular opacities and air bronchograms.

An arterial blood gas analysis on current respiratory settings reveals:

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

A 39-week gestation neonate is delivered via emergency cesarean section due to a severe placental abruption. At birth, the infant is profoundly limp, cyanotic, and exhibits no spontaneous respiratory effort. Arrange the following steps of neonatal resuscitation in the correct chronological sequence, assuming the infant exhibits no clinical improvement and the heart rate persistently remains below 60/min despite an adequate duration of each successive intervention.

A 96-hour-old preterm male neonate (gestational age: 34 weeks, birth weight: 2100 g) is evaluated in the neonatal intensive care unit. He was delivered vaginally following spontaneous labor. Apgar scores were 7 and 9 at 1 and 5 minutes, respectively. Maternal history is notable for prolonged rupture of membranes (22 hours) and an intrapartum fever of $38.5^{\circ}\text{C}$ ($101.3^{\circ}\text{F}$).

At 2 hours of life, the neonate developed tachypnea, nasal flaring, and temperature instability. A complete sepsis workup was performed, and he was empirically started on intravenous ampicillin and gentamicin. He is currently breathing comfortably on room air. Vital signs are temperature $37.1^{\circ}\text{C}$ ($98.8^{\circ}\text{F}$), blood pressure 65/40 mm Hg, heart rate 140/min, and respiratory rate 42/min.

Skin examination reveals a new eruption of scattered, 2- to 3-mm erythematous macules and papules containing central yellow pustules over the chest and abdomen. The remainder of the examination is normal.

Laboratory results obtained at the time of admission are as follows:

The blood culture drawn at admission is now growing *Streptococcus agalactiae* (Group B *Streptococcus*). Antimicrobial susceptibility testing demonstrates that the isolate is susceptible to penicillin G, ampicillin, cefotaxime, and vancomycin. The CSF culture has shown no growth to date.

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

Below are four distinct clinical presentations of neonatal dermatologic conditions. Pair each patient vignette with its corresponding diagnostic finding or appropriate management strategy.

During routine morning rounds in the newborn nursery, a physician evaluates a female infant who developed a diffuse skin eruption at 16 hours of life. The infant was delivered via an uncomplicated vaginal birth at 39 weeks of gestation to a 26-year-old primigravida. Birth weight was $3.2\text{ kg}$ ($7.0\text{ lb}$). Apgar scores were 8 and 9 at 1 and 5 minutes, respectively. Vital signs are temperature $36.9^\circ\text{C}$ ($98.4^\circ\text{F}$), heart rate $142/\text{min}$, and respiratory rate $44/\text{min}$. The infant is alert, active, and feeding vigorously at the breast. Physical examination reveals numerous 2- to 3-mm superficial pustules on a non-erythematous base scattered across the chin, neck, and lower back. Several of the pustules have ruptured, leaving a collarette of fine scale and a central hyperpigmented macule. The remainder of the physical examination is unremarkable. Which of the following is the most appropriate next step in management?

A full-term male neonate (gestational age 40 weeks) is evaluated in the nursery at 48 hours of life due to progressive abdominal distension and two episodes of bilious emesis. A review of the nursing logs indicates that the infant has not yet passed meconium. Vital signs are within normal limits. Physical examination reveals a markedly distended abdomen that is soft and non-tender, with hypoactive bowel sounds. A digital rectal examination results in a sudden, explosive release of foul-smelling gas and stool. Arrange the following diagnostic and therapeutic steps in the most appropriate chronological sequence for managing this patient's likely condition.

Match each neonatal clinical presentation with its most likely underlying diagnosis.

An infant boy is evaluated in the neonatal intensive care unit for increased work of breathing. He was born 4 hours ago to a 30-year-old gravida 2, para 2 woman at 38 weeks gestation. Delivery was via elective repeat cesarean section prior to the onset of labor. The mother has a history of diet-controlled gestational diabetes. Her prenatal screening for group B *Streptococcus* was negative.

Upon evaluation, the infant appears tachypneic. Vital signs are temperature 36.9°C (98.4°F), heart rate 155/min, respiratory rate 82/min, and blood pressure 60/40 mm Hg. Oxygen saturation is 89% on room air. Physical examination reveals nasal flaring, subcostal retractions, and a clear chest to auscultation. The skin examination shows multiple 1- to 2-mm firm, pale yellow pustules surrounded by erythematous halos distributed across the trunk and proximal extremities.

Arterial blood gas on room air shows:

A chest radiograph demonstrates prominent perihilar vascular markings, hyperinflation, and a thin line of radiodensity in the right horizontal fissure.

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

A 12-hour-old male neonate is evaluated in the newborn nursery due to respiratory difficulty and a skin eruption. The infant was born at 38 weeks of gestation via uncomplicated vaginal delivery to a 19-year-old primigravida who recently immigrated and received no prenatal care.

Birth weight is 2100 g (4 lb 10 oz). APGAR scores were 7 and 8 at 1 and 5 minutes, respectively. Vital signs show a temperature of 37.3°C (99.1°F), heart rate of 165/min, and respiratory rate of 55/min.

Physical examination reveals a small-for-gestational-age infant with copious, clear nasal discharge. The abdomen is distended, and the liver edge is palpable 4 cm below the right costal margin along with a palpable spleen tip. Skin examination shows a widespread maculopapular rash with prominent desquamation involving the palms and soles.

Initial laboratory evaluation reveals the following:

Which of the following is the most appropriate next step in pharmacologic management for this infant?

Shortly after delivery via scheduled cesarean section, an infant develops progressively worsening tachypnea and expiratory grunting. The infant was born at $39$ weeks of gestation to a $34$-year-old mother whose pregnancy was complicated by poorly controlled gestational diabetes mellitus. Birth weight is $4.6\text{ kg}$ ($10\text{ lb } 2\text{ oz}$). Vital signs include a temperature of $36.8^\circ\text{C}$ ($98.2^\circ\text{F}$), heart rate of $155\text{/min}$, and respiratory rate of $78\text{/min}$. Pulse oximetry shows $87\%$ on room air. Physical examination reveals marked intercostal retractions and decreased air entry bilaterally. Skin examination shows a diffuse rash consisting of $2\text{-mm}$ pale pustules on an erythematous base across the chest and abdomen. A chest radiograph demonstrates decreased lung volumes, diffuse fine reticulogranular opacities, and prominent air bronchograms. Which of the following is the most appropriate next step in the management of this patient?

A 26-day-old male infant is brought to the pediatric emergency department by his parents due to rapid breathing, poor feeding, and a persistent cough for the past 48 hours. He was born at 38 weeks gestation via uncomplicated spontaneous vaginal delivery. The parents also express concern because the infant does not yet display a social smile or coo. Vital signs show a temperature of 37.5°C (99.5°F), pulse of 165/min, and respirations of 68/min. Pulse oximetry is 91% on room air. Physical examination reveals nasal flaring, prominent intercostal retractions, and diffuse expiratory wheezing with bilateral crackles. Skin examination shows multiple erythematous papules and pustules lacking comedones, strictly confined to his forehead, nose, and cheeks, which the parents say appeared three days ago. A rapid viral respiratory panel is positive for respiratory syncytial virus (RSV). Which of the following is the most appropriate management plan for this patient's current findings?

Match each clinical presentation of a neonatal skin finding to the most likely diagnosis.

Match the following neonatal cranial swellings and findings with their correct pathophysiologic descriptions and clinical presentations.

A 26-day-old male infant, born at 28 weeks gestation, is evaluated in the neonatal intensive care unit due to an acute clinical decline. The infant had been successfully advancing on enteral feedings with fortified maternal breast milk. Over the past 8 hours, he has developed temperature instability, marked abdominal distension, and bilious emesis. Vital signs reveal a temperature of $35.4^\circ\text{C}$ ($95.7^\circ\text{F}$), heart rate of $190\text{ /min}$, respiratory rate of $68\text{ /min}$, and blood pressure of $38/20\text{ mm Hg}$. Physical examination demonstrates a tense, erythematous abdomen with absent bowel sounds. Capillary refill time is 5 seconds.

Laboratory results are as follows:

An anteroposterior abdominal radiograph demonstrates widespread pneumatosis intestinalis and a continuous band of radiolucency across the upper abdomen clearly outlining the falciform ligament.

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

A 60-hour-old male neonate is evaluated in the maternity ward prior to planned hospital discharge. He was born at 38 weeks of gestation via an uncomplicated spontaneous vaginal delivery to a 27-year-old primigravid woman. The mother's prenatal laboratory screening was unremarkable, including negative serologies for syphilis, hepatitis B, and HIV, and she received adequate prenatal care. The neonate has been breastfeeding vigorously every 2 to 3 hours and has had normal urine and meconium output. His temperature is 36.9°C (98.4°F), heart rate is 142/min, and respiratory rate is 40/min. Physical examination reveals a well-appearing, active infant with a widespread skin eruption consisting of scattered 1- to 3-mm yellowish pustules situated on irregular, splotchy, erythematous macular bases. The lesions are prominent on the thorax, abdomen, and proximal extremities, but completely spare the palms and soles. The remainder of the physical examination, including neurologic tone and reflexes, is unremarkable. Which of the following is the most appropriate next step in management?

A term infant is delivered vaginally. Immediately after birth, the infant is noted to be apneic and limp with a heart rate of 70/min. Arrange the following neonatal resuscitation interventions in the correct chronological sequence for this patient, assuming the infant's condition fails to improve after each consecutive step.

A term infant is delivered at 41 weeks gestation via emergent cesarean delivery for non-reassuring fetal heart tones. The delivery is complicated by thick meconium-stained amniotic fluid. Immediately after birth, the infant is limp, apneic, and has a heart rate of 80/min. Arrange the following steps of neonatal resuscitation in the correct chronological order, assuming the infant's clinical status persistently fails to improve with each preceding intervention.

A 28-year-old primigravida presents to the labor and delivery ward in active labor following spontaneous rupture of membranes $22\text{ hours}$ prior. Her prenatal care was limited, and her maternal Group B Streptococcus (GBS) colonization status is unconfirmed. She delivers a female neonate at $36\text{ weeks}$ gestation. The infant's birth weight is $2600\text{ g}$ ($5\text{ lb } 12\text{ oz}$). APGAR scores are $7$ and $8$ at $1$ and $5\text{ minutes}$, respectively.

At $30\text{ hours}$ of life, the newborn develops profound lethargy and poor feeding. Vital signs are:

Physical examination reveals an ill-appearing infant with audible grunting, intercostal retractions, and a capillary refill time of $4\text{ seconds}$.

Laboratory evaluation shows:

Cerebrospinal fluid, blood, and urine specimens are obtained for culture.

Which of the following represents the most appropriate initial empiric pharmacotherapy for this patient?

Match each clinical description of a benign neonatal skin finding to its most accurate diagnosis. Recognizing these normal variants is critical to prevent unnecessary diagnostic interventions and parental anxiety.

The parents of a $22$-day-old female neonate bring her to the urgent care clinic during the winter due to worsening breathing difficulties. Over the past three days, the infant has had clear nasal discharge and a mild cough, but today she is breathing much faster than usual and tiring quickly while breastfeeding. The mother also expresses concern regarding a facial rash that appeared a week ago. The infant was born full-term with no perinatal complications. Her temperature is $37.3^\circ\text{C}$ ($99.1^\circ\text{F}$), pulse is $165/\text{min}$, respiratory rate is $72/\text{min}$, and oxygen saturation is $94\%$ on room air. Physical examination reveals an alert but tachypneic infant with moderate subcostal retractions and diffuse bilateral expiratory wheezing. Examination of the face reveals multiple erythematous papules and pustules localized to the cheeks and forehead, with an absence of open or closed comedones. Which of the following is the most appropriate next step in the management of this patient?