First Aid for the USMLE Step 2 CS

Section 3. Minicases

Child With Fever

No child will be present; the mother will relate the story. When you enter the examination room, you may see a telephone with instructions to pick up the handset. Upon doing so, you will be speaking to the parent of the child.

Key History

Severity, duration; associated localizing symptoms such as rash, wheezing, cough, and ear discharge; poor appetite, convulsions, lethargy, sleepiness; sick contacts, day care, immunizations.

Key Physical Exam

Vital signs; HEENT, neck, heart, lung, abdominal, and skin exams.

Presentation

Differential

Workup

■ 20-day-old M presents with fever, decreased breastfeeding, and lethargy. He was born at 36 weeks as a result of premature rupture of membranes.

Neonatal sepsis

Meningitis

Pneumonia

Pyelonephritis

Physical exam

CBC

Electrolytes

Blood culture

LP—CSF analysis

CXR

UA, urine culture

■ 3 yo M presents with a 2-day history of fever and pulling on his right ear. He is otherwise healthy, and his immunizations are up to date. His older sister recently had a cold. The child attends a day care center.

Acute otitis media

URI

Meningitis

Pyelonephritis

Physical exam (including pneumatic otoscopy)

CBC

Blood culture

Tympanocentesis culture

LP—CSF analysis

UA, urine culture

CHILD WITH FEVER (cant'd)

Presentation

Differential

Workup

■ 12-month-old M presents with fever for the past 2 days accompanied by a maculopapular rash on his face and body. He has not yet received the MMR vaccine.

Measles (or other viral exanthem)

Rubella

Roseola

Fifth disease

Varicella

Scarlet fever

Meningitis

Physical exam

CBC

Viral antibodies/titers

Throat swab for culture

LP—CSF analysis

■ 4 yo M presents with diarrhea, vomiting, lethargy, weakness, and fever. The child attends a day care center where several children have had similar symptoms.

Gastroenteritis (viral,

bacterial, parasitic)

Food poisoning

UTI

URI

Volvulus

Intussusception

Physical exam

Stool exam and culture

CBC

Electrolytes

UA, urine culture

AXR

Child With Gi Symptoms

No child will be present; only the parent will relate the story, either in person or by telephone.

Key History

Onset, location, quality, intensity, duration, radiation, timing (relation to meals); associated symptoms (constitutional, GI, cardiac, pulmonary, renal, pelvic); changes in weight, skin rash, bloody/mucoid stools, change in stool color; exacerbating and alleviating factors; history of similar symptoms; history of abdominal surgeries; medications; sick contacts, day care, immunizations.

Key Physical Exam

Vital signs; exam for signs of dehydration (BP, heart rate, skin turgor); heart and lung exams; abdominal exam; rectal exam; pelvic exam (women).

CHILD WITH GI SYMPTOMS (cont'd)

Presentation

Differential

Workup

■ 1-month-old F is brought in because she has been spitting up her milk for the last 10 days. The vomiting episodes have increased in frequency and forcefulness. Emesis is nonbloody and nonbilious. The episodes usually occur immediately after breastfeeding. She has stopped gaining weight.

Pyloric stenosis

Partial duodenal atresia

GERD

Gastroenteritis

Hepatitis

UTI

Otitis media

Physical exam CBC

Electrolytes U/S—abdomen

Barium swallow pH probe

Endoscopy

AST/ALT/bilirubin/ alkaline phosphatase

UA, urine culture

Tympanocentesis culture

■ 3 yo M presents with constipation. The child has had 1 bowel movement per week since birth despite the use of stool softeners. At birth, he did not pass meconium for 48 hours. He has poor weight gain. There is a family history of this problem.

Hirschsprung’s disease

Low-fiber diet

Anal stenosis Hypothyroidism

Lead poisoning

Physical exam

Rectal exam

Stool exam and culture

Barium enema

Suction rectal biopsy

Anorectal manometry TSH, FT4 CBC

Electrolytes

Serum lead level

■ 8-month-old F presents with sudden-onset colicky abdominal pain with vomiting. The episodes are 20 minutes apart, and the child is completely well between episodes. She had loose stools several hours before the pain, but her stools are now bloody.

Intussusception

Appendicitis

Meckel’s diverticulum

Volvulus

Gastroenteritis

Enterocolitis

Blunt abdominal trauma

Physical exam

Rectal exam, stool for occult blood CBC

Electrolytes

Contrast enema

U/S—abdomen

CT—abdomen

■ 7 yo M presents with abdominal pain that is generalized, crampy, worse in the morning, and seemingly less prominent during weekends and holidays. He has missed many school days because of the pain. Growth and development are normal. His parents recently divorced.

Somatoform disorder

Malingering

Irritable bowel syndrome Lactose intolerance

Child abuse

Physical exam

CBC

Electrolytes

U/S—abdomen

CT—abdomen

Amylase, lipase

Stool exam

CHILD WITH GI SYMPTOMS (cant'd)

Presentation

Differential

Workup

■ 2-month-old M presents with persistent crying for 2 weeks. The episodes subside after passing flatus or eructation. There is no change in appetite, weight, or growth. There is no vomiting, constipation, or fever.

Colic

Formula allergy

GERD

Lactose intolerance Strangulated hernia Testicular torsion Gastroenteritis

Physical exam

Rectal exam, stool for occult blood

U/S—abdomen

U/S—testicular



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