A 42-year-old woman presents to the emergency department in active labor. She has had no prenatal care and is unsure of the gestational age. Labor progresses rapidly and spontaneous vaginal delivery of a baby boy occurs 3 hours after presentation. On initial exam, the child is 1.9 kg (4.2 lb) with a small head and jaw. A sac-like structure containing intestine, as can be seen in the picture, protrudes from the abdominal wall. What complication is closely associated with this presentation?

Dehydration and necrosis of bowel

Twisting of the bowel around itself

An 8-year-old boy and his 26-year-old babysitter are brought into the emergency department with severe injuries caused by a motor vehicle accident. The child is wheeled to the pediatric intensive care unit with a severe injury to his right arm, as well as other external and internal injuries. He is hemorrhaging and found to be hemodynamically unstable. He subsequently requires transfusion and surgery, and he is currently unconscious. The pediatric trauma surgeon evaluates the child’s arm and realizes it will need to be amputated at the elbow. Which of the following is the most appropriate course of action to take with regards to the amputation?

Amputate the child’s arm at the elbow joint

Obtain an emergency court order from a judge to obtain consent to amputate the child’s arm

Find the child’s parents to obtain consent to amputate the child’s arm

Wait for the child’s babysitter to recover from her injuries to obtain her consent to amputate the child’s arm

Wait for the child to gain consciousness to obtain his consent to amputate his arm

A 6-month-old boy is brought to the physician because of a right-sided scrotal swelling for the past 2 months. The swelling is intermittent and appears usually after the patient has been taken outdoors in a baby carrier, and disappears the next morning. The patient was born at term without complications and has been healthy. Examination shows a 3-cm, soft, nontender, and fluctuant right scrotal mass that is reducible and does not extend into the inguinal area. A light held behind the scrotum shines through. There are no bowel sounds in the mass. The remainder of the examination shows no abnormalities. Which of the following is the most appropriate next step in the management of this patient?

Ligation of the patent processus vaginalis

Cardiac surgery is consulted on a newborn with a large ventricular septal defect. The child has poor weight gain and feeding difficulties. He requires furosemide and captopril to avoid dyspnea. On physical examination his temperature is 36.9°C (98.4°F), pulse rate is 158/min, respiratory rate is 30/min, and blood pressure is 94/62 mm Hg. Chest auscultation reveals a holosystolic murmur along the left lower sternal border and a mid-diastolic low-pitched rumble at the apex. Abdominal examination reveals the presence of hepatomegaly. An echocardiogram confirms a diagnosis of a membranous VSD while hemodynamic studies show a Qp:Qs ratio of 2.8:1. Which of the following is the best management option?

Continue medical treatment and provide reassurance about spontaneous closure of the defect

Hybrid surgery using both transcatheter device and surgical repair

Transcatheter occlusion of the defect

Addition of digoxin to the current medical regimen with regular follow-up until spontaneous closure occurs

A 4-year-old-female presents with a flattened, reddish 2 cm lump located at the base of the tongue. The patient's mother reports her having trouble swallowing, often leading to feeding difficulties. The mother also reports lethargy, constipation, dry skin, and hypothermia. Which of the following is the most appropriate management of this patient’s presentation?

Thyroid hormone replacement therapy with levothyroxine

No treatment is necessary, counsel mother on alternative feeding techniques

Combination therapy of methimazole and Beta-blockers

A 2-year-old boy is brought to a pediatrician because his parents have noticed that he seems to be getting tired very easily at home. Specifically, they have noticed that he is often panting for breath after walking around the house for a few minutes and that he needs to take naps fairly often throughout the day. He has otherwise been well, and his parents do not recall any recent infections. He was born at home, and his mom did not receive any prenatal care prior to birth. Physical exam reveals a high-pitched, harsh, holosystolic murmur that is best heard at the lower left sternal border. No cyanosis is observed. Which of the following oxygen tension profiles would most likely be seen in this patient? (LV = left ventricle, RV = right ventricle, and SC = systemic circulation).

LV: normal, RV: increased, SC: normal

LV: normal, RV: normal, SC: normal

LV: decreased, RV: increased, SC: decreased

LV: decreased, RV: normal, SC: decreased

LV: normal, RV: normal, SC: decreased

A 5-month-old boy is brought to the emergency department by his mother because his lips turned blue for several minutes while playing earlier that evening. She reports that he has had similar episodes during feeding that resolved quickly. He was born at term following an uncomplicated pregnancy and delivery. He is at the 25th percentile for length and below the 5th percentile for weight. His temperature is 37°C (98.6°F), pulse is 130/min, blood pressure is 83/55 mm Hg, and respirations are 42/min. Pulse oximetry on room air shows an oxygen saturation of 90%. During the examination, he sits calmly in his mother's lap. He appears well. The patient begins to cry when examination of his throat is attempted; his lips and fingers begin to turn blue. Further evaluation of this patient is most likely to show which of the following?

Pulmonary vascular congestion on x-ray of the chest

Anomalous pulmonary venous return on MR angiography

Diminutive left ventricle on echocardiogram

Machine-like hum on auscultation

A 1-day-old infant born at full term by uncomplicated spontaneous vaginal delivery is noted to have cyanosis of the oral mucosa. The baby otherwise appears comfortable. On examination, his respiratory rate is 40/min and pulse oximetry is 80%. His left thumb is displaced and hypoplastic. A right ventricular lift is palpated, S1 is normal, S2 is single, and a harsh 3/6 systolic ejection murmur is heard at the left upper sternal border. Chest X-ray is shown. Which of the following is the most likely diagnosis?

Transient tachypnoea of the newborn

Surgical management timing for USMLE Step 1: High-Yield Pediatrics Lessons

Emergency Surgeries - The First Day Fix

Immediate surgical correction is vital for several neonatal conditions to prevent mortality and morbidity. The focus is on stabilization followed by timely repair.

Malrotation with Volvulus: True emergency. Immediate Ladd's procedure to prevent bowel necrosis.
Gastroschisis: Urgent repair within <24h due to high fluid/heat loss from exposed bowel.
Tracheoesophageal Fistula (TEF): Ligation & anastomosis within 24-48h to prevent aspiration.
Duodenal Atresia: Decompress stomach; surgery within 24-48h.
Congenital Diaphragmatic Hernia (CDH): Stabilize first! Surgery is delayed for 48-72h to manage pulmonary hypertension.

⭐ In Gastroschisis, the defect is almost always to the right of the umbilicus, and there is no covering sac over the herniated bowel, unlike an omphalocele.

Infancy Interventions - The First Year Fixes

Ventricular Septal Defect (VSD) & Tetralogy of Fallot (TOF):
- Optimal timing for elective surgery: 3-6 months.
- Early intervention is crucial for managing heart failure, severe cyanosis, or failure to thrive.
Cleft Lip:
- 📌 Mnemonic: "Rule of 10s" guides the timing for surgical repair.
- Requires: Weight > 10 pounds, Hb > 10 g/dL, and Age > 10 weeks.
Congenital Hypertrophic Pyloric Stenosis (CHPS):
- Presents at 2-8 weeks; managed with Ramstedt's Pyloromyotomy after correcting metabolic alkalosis.

⭐ Exam Favourite: The degree of Right Ventricular Outflow Tract Obstruction (RVOTO) is the primary determinant of clinical severity and presentation timing in Tetralogy of Fallot.

Toddler Timings - Elective Edits

Surgical corrections in toddlers are electively timed for optimal anatomical growth and physiological stability. This window allows for better tissue handling and reduced anesthetic risk in stable infants.

Cleft Palate Repair
- Optimal Age: 9-12 months.
- Rationale: Timed to facilitate normal speech development, preventing fixed misarticulations.
Hypospadias Repair
- Optimal Age: 6-18 months.
- Rationale: Performed before toilet training and body awareness to minimize psychological impact.
Cryptorchidism (Orchiopexy)
- Optimal Age: 6-12 months.
- Rationale: Preserves fertility and reduces testicular malignancy risk. Indicated if not descended by 6 months.
Atrial Septal Defect (ASD)
- Elective closure at 3-5 years for asymptomatic cases to prevent future right ventricular dysfunction.
Inguinal Hernia / Hydrocele
- Hernia: Prompt repair (high incarceration risk).
- Hydrocele: Surgery if persists >12-18 months.

⭐ In Hypospadias, the foreskin is vital for surgical repair (urethroplasty). Therefore, neonatal circumcision is absolutely contraindicated.

High‑Yield Points - ⚡ Biggest Takeaways

Congenital Diaphragmatic Hernia (CDH): Delayed repair is crucial; stabilize pulmonary hypertension first.

Tracheoesophageal Fistula (TEF): Requires prompt surgery once the baby is stable.

Gastroschisis is a surgical emergency needing immediate closure.

Cleft Lip repair follows the Rule of 10s (at ~3 months); Cleft Palate is repaired later, at 9-12 months.

Large VSDs causing failure to thrive are repaired at 3-6 months.

Undescended Testis requires orchiopexy at 6-12 months.

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