Pediatrics

A 28-year-old woman, gravida 2 para 1, presents to the labor and delivery unit in active labor. Her prenatal laboratory screening is positive for Hepatitis B surface antigen (HBsAg). She delivers a healthy, full-term male newborn. The pediatric team formulates a comprehensive management pathway to prevent vertical Hepatitis B transmission, confirm the infant's immunity, and manage potential vaccine non-response. Arrange the following steps in the standard protocol for this infant in the correct chronological order, representing the sequence of interventions from birth through the management of an inadequate initial immune response (anti-HBs < 10 mIU/mL).

A 4-day-old male neonate, born at 39 weeks gestation, is currently in the neonatal intensive care unit. He was admitted 48 hours ago for temperature instability, tachypnea, and poor feeding. A full sepsis workup was performed at admission, and empiric intravenous ampicillin and gentamicin were initiated. The infant is now clinically stable, feeding well, and afebrile. Today, the admission blood culture is finalized and demonstrates heavy growth of Streptococcus agalactiae (Group B Streptococcus) that is sensitive to penicillin, ampicillin, cefotaxime, and vancomycin. The cerebrospinal fluid culture remains sterile. During morning rounds, the nurse notes a new rash on the infant's chest and back consisting of scattered 2-mm to 3-mm erythematous macules, some with central pale-yellow pustules. The infant appears completely unbothered by the rash. A Wright-Giemsa stain of the pustular contents shows numerous eosinophils and no bacteria. Which of the following is the most appropriate next step in the management of this patient?

A 15-month-old girl is brought to the clinic for a routine well-child visit. She has a history of idiopathic nephrotic syndrome. Three weeks ago, she experienced a relapse and was started on oral prednisone at a dose of $2.5 \text{ mg/kg/day}$, which she continues to take. Her immunizations are up to date through 6 months of age, but she missed her 12-month visit. Her parents report she walks independently and can build a tower of 2 blocks. She says "mama," "dada," and three other specific words, and she points to objects she wants. The parents are concerned about her language development because her older sibling was speaking in two-word phrases by this age. Vital signs are within normal limits. Physical examination reveals a cushingoid appearance but is otherwise unremarkable. Which of the following is the most appropriate next step in management for this patient?

A female neonate, born at 40 weeks gestation following an uncomplicated pregnancy, is examined in the nursery on her second day of life due to a new-onset skin eruption. Her vital signs are within normal limits, and she is feeding vigorously without distress. Physical examination reveals scattered, splotchy erythematous macules, some of which contain central 1- to 2-mm pale yellow pustules. These lesions are prominent on her chest, back, and proximal arms, but are notably absent on her palms and soles. She exhibits normal primitive reflexes and has no apparent lymphadenopathy or hepatosplenomegaly. Which of the following is the most appropriate next step in the management of this patient's dermatologic findings?

A mother brings her 3-week-old male infant to the outpatient clinic due to a facial rash that began five days ago. The infant was delivered vaginally at 40 weeks of gestation without any peripartum complications. He is exclusively breastfed, has normal bowel movements, and is steadily gaining weight. His temperature is 37.1°C (98.8°F). Physical examination reveals scattered erythematous papules and small pustules localized exclusively to the forehead, cheeks, and chin. There are no comedones present, and the remainder of the physical examination is unremarkable. Which of the following is the most appropriate management for this patient?

A pediatric clinic is auditing its health maintenance protocols to ensure alignment with current American Academy of Pediatrics (AAP) guidelines. As part of the protocol review, the clinical director maps out the timeline for required universal screenings for patients with no specific medical or family risk factors. Arrange the following universal pediatric screening interventions in the expected chronological order that they are first recommended for a typically developing, average-risk child, from earliest to latest age.

Neonatal respiratory disorders frequently present with similar signs of respiratory distress, including tachypnea, grunting, and retractions, but their underlying mechanisms differ significantly. Match each of the following neonatal respiratory disorders with its primary underlying pathophysiology.

A neonate born at 36 weeks of gestation is currently 72 hours old and is being monitored in the intermediate care nursery. The nursing staff alerts the physician after noting a sudden decrease in the infant's responsiveness and failure to take the last two scheduled bottle feeds. He was delivered vaginally with a birth weight of 2,600 g. Apgar scores were 8 and 9 at 1 and 5 minutes, respectively. Maternal group B *Streptococcus* screening was reportedly negative, but the mother had limited prenatal care.

Upon examination, the infant is lethargic with mottled, cool skin. A generalized eruption consisting of erythematous macules with central yellow pustules is noted over the trunk. He exhibits significantly increased work of breathing with nasal flaring and expiratory grunting.

Vital signs show:
- Core temperature: 35.4°C (95.7°F)
- Heart rate: 182/min
- Respiratory rate: 78/min
- Blood pressure: 42/22 mm Hg
- Oxygen saturation: 85% on room air

An arterial blood gas is drawn, and results are as follows:

A rapid point-of-care blood multiplex polymerase chain reaction (PCR) assay is positive for *Streptococcus agalactiae*.

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

Arrange the following developmental milestone groupings in the chronological order they would typically be expected to first appear in a neurotypically developing child, from earliest age to latest age.

A full-term infant is evaluated in the newborn nursery at 18 hours of life. The pregnancy was uncomplicated, and maternal prenatal serologies were negative. The infant transitioned smoothly after birth, maintaining stable vital signs. Current temperature is 37.0°C (98.6°F), pulse is 142/min, and respirations are 42/min. On physical examination, the physician notes numerous 1- to 2-mm, firm, pearly-white papules densely clustered on the nasal bridge, chin, and forehead. There is no surrounding erythema or purulence. The remainder of the examination, including cardiopulmonary and neurologic assessments, is unremarkable. Which of the following is the most appropriate next step in the management of this patient?

A $12$-month-old boy and his $4$-year-old sister are brought to the clinic by their mother for routine well-child visits. The boy was diagnosed with perinatal HIV infection shortly after birth and is currently taking antiretroviral therapy. He has had no opportunistic infections. His laboratory studies from one week ago show an HIV viral load of $45,000$ copies/mL, a CD4+ T-lymphocyte percentage of $12\%$, and an absolute CD4+ count of $410$ cells/mm³. The $4$-year-old sister is healthy, takes no medications, and has a normal physical examination. Both children have received all age-appropriate vaccinations up to this point. The mother expresses concern about whether the children can safely receive their scheduled immunizations today, particularly the "live virus" vaccines, given the boy's HIV status. Which of the following is the most appropriate immunization plan for these siblings today?

Match each of the following pediatric clinical vignettes describing an acute osteoarticular presentation with the most likely responsible infectious agent.

A 15-month-old boy is brought to the clinic for a routine preventive care visit. He is previously healthy and has received all recommended immunizations up to 6 months of age. His 6-year-old sister was recently diagnosed with acute lymphoblastic leukemia and is currently undergoing induction chemotherapy. The parents are highly anxious about the 15-month-old receiving any vaccines that could potentially transmit an infection to his severely immunocompromised sister. When asked about the boy's development, the parents report that he walks independently, can drink from a cup, and has a vocabulary of four words, including "mama" and "dada". They express concern that his speech is delayed compared to his sister at this age. His physical examination today is unremarkable. Which of the following is the most appropriate next step in management?

A term neonate born to a mother with blood type O, Rh-negative develops visible scleral and cutaneous icterus at 24 hours of life. Assuming the infant has confirmed ABO incompatibility and the clinical condition progressively worsens despite each preceding intervention, arrange the following diagnostic and therapeutic steps in the correct escalating chronological sequence.

A mother brings her 48-month-old daughter to the clinic for a medical evaluation before the child begins a pre-kindergarten program. The mother expresses significant concern regarding the child's fine motor progression and self-care independence. Specifically, she notes that the girl is unable to draw a triangle, struggles to use scissors to cut out complex shapes, and still requires assistance with tying her shoelaces and fastening small buttons. The mother mentions that her older son had mastered these tasks by this age. During the visit, the child speaks in complete, easily understood sentences and enthusiastically shares a detailed story about her pets. Clinical observation reveals she can successfully copy a cross, draw a person with three distinct body parts, and hop on one foot. She is noted to engage in cooperative, imaginative play with dolls in the examination room. Physical examination is unremarkable. Which of the following is the most appropriate next step in the management of this patient?

A male neonate is evaluated in the well-baby nursery at $16$ hours of life. He was delivered at $41$ weeks of gestation via an uncomplicated spontaneous vaginal delivery to a $29$-year-old primigravid woman. The maternal pregnancy course was routine, and all prenatal serologies were negative. The infant's vital signs are within normal limits, and he is breastfeeding vigorously. Physical examination reveals a widespread eruption of small, flaccid vesiculopustules on the forehead, chin, and lower back. Several of these lesions have already ruptured, leaving flat, hyperpigmented macules surrounded by a fine collarette of scale. A microscopic examination of the fluid obtained from an intact pustule using a Wright stain demonstrates a heavy predominance of neutrophils without any visible microorganisms. Which of the following is the most appropriate next step in the care of this patient?

A term newborn is delivered via emergency cesarean section due to fetal bradycardia. At birth, the infant is apneic, limp, and cyanotic. Assume the infant's condition continues to deteriorate and fails to respond to each successive intervention. Arrange the following neonatal resuscitation steps in the correct chronological order according to standard guidelines.

A 9-month-old girl is brought to the clinic in late December with a 3-day history of nasal congestion, low-grade fever, and a prominent cough. Her parents report that today she has been breathing faster than usual and they can hear a wheezing sound. Her temperature is 37.8°C (100.0°F), heart rate is 130/min, respiratory rate is 54/min, and oxygen saturation is 96% on room air. Physical examination reveals mild subcostal retractions and diffuse expiratory wheezes and crackles bilaterally. She is alert, interacting appropriately with her parents, and taking her formula without difficulty. Which of the following is the most appropriate next step in management?

Match each pediatric patient presenting for a routine well-child visit with the age-appropriate universal screening intervention recommended by the American Academy of Pediatrics (AAP), regardless of their individual risk factors.

A 38-week-gestation male neonate is born to a 28-year-old G2P1 mother with blood type O, Rh-negative. The mother did not receive prenatal care or anti-D immune globulin during her pregnancy. At 8 hours of life, the infant becomes progressively lethargic and is noted to have significant scleral icterus and jaundice extending to the lower abdomen. A transcutaneous bilirubin measurement is markedly elevated above the 95th percentile for his age in hours. Arrange the following diagnostic and therapeutic steps in the most appropriate escalating chronological sequence for the management of this patient's condition.