Pediatrics

A 4-week-old female infant is brought to the pediatric clinic by her mother due to poor feeding, nasal congestion, and a rash. The infant was born at 39 weeks gestation via uncomplicated vaginal delivery to a 22-year-old primigravida. The mother began prenatal care at 28 weeks gestation, at which time a rapid plasma reagin (RPR) test was nonreactive. At delivery, a repeat maternal RPR was ordered and reported as nonreactive. The mother reports no history of sexually transmitted infections. On examination, the infant is in the 5th percentile for weight. She has copious, blood-tinged nasal discharge. A diffuse, erythematous, maculopapular rash with areas of superficial desquamation is present on the trunk, palms, and soles. The infant cries vigorously when her right arm is palpated and maintains the arm in a rigid, extended position. Abdominal examination reveals the liver edge 4 cm below the right costal margin. Given the high clinical suspicion, a serum RPR is obtained from the infant and returns reactive at a titer of 1:1024. Confirmatory fluorescent treponemal antibody absorption (FTA-ABS) testing is positive. Which of the following best explains the discrepant maternal and infant serologic findings at the time of delivery?

Match each classic neonatal clinical presentation with the most likely responsible congenital infection.

A 5-month-old male infant is brought to the emergency department in January due to a 3-day history of nasal congestion, clear rhinorrhea, and low-grade fever. Over the last 24 hours, he has developed a persistent, wet-sounding cough and poor feeding, taking only half of his usual formula volume. His temperature is 37.8°C (100.0°F), pulse is 155/min, respiratory rate is 68/min, and oxygen saturation is 93% on room air. Physical examination reveals an irritable but consolable infant with nasal flaring and mild subcostal retractions. Auscultation of the lungs demonstrates diffuse expiratory wheezes and scattered bilateral fine crackles. There is no stridor at rest. Which of the following is the most appropriate next step in the management of this patient?

An $11$-month-old boy is evaluated in the outpatient clinic in late January for a cough and rapid breathing. His symptoms began $3$ days ago with clear rhinorrhea and a low-grade temperature. His $4$-year-old sister recently missed school due to a mild respiratory infection. The patient was born at $39$ weeks gestation and has no significant past medical history. His temperature is $37.5^\circ\text{C}$ ($99.5^\circ\text{F}$), pulse is $138/\text{min}$, respiratory rate is $50/\text{min}$, and oxygen saturation is $95\%$ on room air. Physical examination reveals an infant who appears mildly fussy but consolable. Auscultation demonstrates prolonged expiration, diffuse polyphonic wheezes, and mild subcostal retractions bilaterally. Which of the following is the most appropriate next step in the management of this patient?

Correlate the following classic neonatal clinical presentations with their most likely causative congenital infectious agent.

A $4$-month-old female infant is evaluated in the pediatric emergency department for a $2$-day history of worsening respiratory distress and poor feeding. Her parents state she has always been a "floppy" baby. On physical examination, the infant is tachypneic with intercostal retractions. She exhibits profound generalized hypotonia, a weak cry, and an enlarged, protruding tongue. The parents mention she is unable to sit without support or transfer objects from hand to hand. Auscultation reveals a gallop rhythm and diffuse expiratory wheezing. Chest radiograph demonstrates massive cardiomegaly. Laboratory findings include a serum TSH of $2.1\ \mu\text{U/mL}$ (normal: $0.5-5.0$) and Free T4 of $1.4\ \text{ng/dL}$ (normal: $0.9-1.7$). An arterial blood gas on room air shows:

pH: $7.25$
$\text{pCO}_2$: $60\ \text{mmHg}$
$\text{HCO}_3^-$: $26\ \text{mEq/L}$

Which of the following statements regarding this patient's clinical picture is most accurate?

An infant is delivered at 34 weeks of gestation to a 28-year-old primigravida. The mother experienced a mild febrile illness with myalgias three weeks prior to delivery, shortly after consuming unpasteurized dairy products at a farm stand. Following birth, the infant initially appears well but develops progressive lethargy, apneic episodes, and temperature instability by 24 hours of life. Vital signs show a temperature of $35.8^\circ\text{C}$ ($96.4^\circ\text{F}$), heart rate of 170/min, and respiratory rate of 65/min. Skin examination reveals scattered 1-2 mm pale yellow papules on an erythematous base over the chest and trunk, sparing the palms and soles. A lumbar puncture is performed, and cerebrospinal fluid analysis demonstrates a leukocyte count of $850/\text{mm}^3$ with $80\%$ neutrophils, glucose of $20\text{ mg/dL}$, and protein of $150\text{ mg/dL}$. Gram stain of the fluid reveals intracellular and extracellular Gram-positive bacilli. Which of the following is the most appropriate antimicrobial regimen for this patient?

Match each pediatric infectious disease clinical scenario with the most appropriate antimicrobial management strategy, taking into account age-specific pharmacological safety profiles and treatment guidelines.

A 9-year-old boy is brought to the emergency department via ambulance for severe difficulty breathing. His parents report that his symptoms began $12$ hours ago with a cough and wheezing, and worsened significantly over the past $6$ hours. He has a history of moderate persistent asthma and has been using his albuterol inhaler every hour for the past $6$ hours without relief. He is fully immunized. On arrival, the patient is agitated, diaphoretic, and speaking in single words. His temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), blood pressure is $110/70\text{ mm Hg}$, pulse is $148/\text{min}$, and respirations are $44/\text{min}$. Pulse oximetry shows $86\%$ on room air. Physical examination reveals marked suprasternal and subcostal retractions. Lung auscultation reveals diminished air entry bilaterally with a prolonged expiratory phase and faint, high-pitched expiratory wheezing. Arrange the following interventions in the most appropriate sequence of administration for this patient's acute management.

A $9$-day-old female infant arrives at the emergency department presenting with worsening lethargy, recurrent vomiting, and poor feeding over the past $24$ hours. She has been exclusively breastfed since birth. Physical examination demonstrates marked scleral icterus, hypotonia, and a liver edge palpable $3$ cm below the right costal margin. Initial point-of-care blood glucose is $38$ mg/dL. A urinalysis is negative for glucose but strongly positive for reducing substances. Arrange the following management and diagnostic steps in the most appropriate sequential order for this patient.

A 7-year-old girl is brought to the emergency department experiencing an acute severe asthma exacerbation. She is visibly distressed with supraclavicular retractions, scattered wheezing, and an oxygen saturation of 89% on room air. Arrange the following interventions in the most appropriate stepwise order of priority and escalation, from the immediate first step to the appropriate step for refractory symptoms.

Match each pediatric clinical presentation to its most likely causative pathogen.

Neonatal rashes and skin findings are common and typically benign, but distinguishing between them based on timing and clinical morphology is essential to prevent unnecessary invasive diagnostic workups. Match each described neonatal clinical presentation with the most accurate dermatologic diagnosis.

During a mid-December clinic visit, a physician evaluates a 5-month-old infant due to three days of nasal congestion and a worsening cough. The parents report the infant has been breathing more rapidly since this morning but continues to breastfeed well and produce normal wet diapers. The patient was born at 39 weeks gestation and has no significant past medical history. Vital signs show a temperature of 37.6°C (99.7°F), heart rate of 138/min, respiratory rate of 52/min, and oxygen saturation of 97% on room air. Examination shows copious clear nasal discharge, mild subcostal retractions, and diffuse bilateral wheezing with scattered coarse crackles. Which of the following is the most appropriate next step in management?

A 4-week-old boy is evaluated in the pediatric clinic after his parents noticed a new facial eruption. The parents report that the lesions began developing three days ago and seem to be increasing in number. The infant was born at 39 weeks gestation via uncomplicated vaginal delivery to a 28-year-old primigravid mother. He is exclusively breastfed, stooling normally, and gaining weight appropriately. Vital signs are within normal limits. Physical examination reveals an alert, well-appearing infant. There are multiple small, erythematous papules and pustules scattered across the patient's forehead, cheeks, and chin. No true comedones are observed. The remainder of the skin examination, including the trunk and extremities, is unremarkable. Which of the following is the most appropriate next step in management for this patient?

An unimmunized 3-year-old girl is brought to the emergency department due to a rapid onset of high fever, severe sore throat, and progressive difficulty breathing over the past 4 hours. Her temperature is $39.8^\circ\text{C}$ ($103.6^\circ\text{F}$), heart rate is $155/\text{min}$, and respiratory rate is $42/\text{min}$. The child is highly anxious, sitting upright, leaning forward, and drooling. Inspiratory stridor is clearly audible without a stethoscope. Arrange the following acute management steps in the most appropriate sequential order for this patient.

Match each pediatric clinical presentation with the most likely underlying genetic or metabolic disorder.

A 5-year-old girl is brought to the pediatric emergency department due to severe headache, high fever, and progressive confusion over the past 12 hours. Upon arrival, her temperature is 39.5°C (103.1°F), heart rate is 155/min, blood pressure is 80/45 mmHg, and respiratory rate is 32/min. She is obtunded, opening her eyes only to painful stimuli. Physical examination reveals nuchal rigidity, a non-blanching purpuric rash on her lower extremities, and new-onset right-sided hemiparesis.

Assuming the patient's hemodynamic status stabilizes and neuroimaging does not reveal signs of impending herniation, arrange the following critical management steps in the most appropriate chronological sequence.

A 24-month-old toddler is evaluated in an outpatient clinic during the late fall due to a distinctive, harsh cough. Her mother reports that the child had a runny nose and a temperature of 37.6°C (99.7°F) for the past two days. Last night, the child woke up with a hoarse cry and a cough that the mother describes as sounding like a "seal barking." During the current examination, the patient is playful and sitting comfortably on her mother's lap. Vital signs reveal a heart rate of 112/min, a respiratory rate of 24/min, and an oxygen saturation of 99% on room air. There is no visible chest wall retraction, and no abnormal airway sounds are heard while the child is resting quietly. Auscultation of the lung fields reveals clear breath sounds bilaterally. Which of the following is the most appropriate next step in the management of this patient?

A $14$-day-old boy is brought to the clinic by his mother because his $4$-year-old sister was diagnosed with chickenpox yesterday. The sister's vesicular rash first appeared $48$ hours ago, and she has been isolated in her room since. The neonate was born at $39$ weeks gestation via uncomplicated vaginal delivery. The mother's prenatal laboratory screening was unremarkable, but she notes that she grew up in an isolated rural community and has never had chickenpox. Her prenatal varicella-zoster IgG antibody titer was negative. The neonate is exclusively breastfed. The mother also reports that the infant developed mild rhinorrhea and an occasional cough this morning. His rectal temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), heart rate is $142/\text{min}$, and respiratory rate is $42/\text{min}$. Physical examination reveals an afebrile, alert infant in no acute distress. The lungs are clear to auscultation. Skin examination shows several scattered erythematous macules with 1- to 2-mm central yellow-white papules on the anterior chest and back. Which of the following is the most appropriate next step in management?