Pediatrics · Year 3 · from Pediatrics
Case 3: Pediatric Obesity
Patient Demographics
- Age: 10-year-old male
- Sex: Male
Chief Complaint
"The school nurse said my son's BMI is too high and he needs to see a doctor."
History of Present Illness
A 10-year-old male is brought in by his mother after school BMI screening identified him as obese. Mother reports he has always been "big boned" like his father's side of the family. He was average weight as a young child but has gained significantly over the past 3-4 years. His typical day includes skipping breakfast, eating school lunch and often buying extra snacks, drinking 2-3 sodas daily, and eating fast food several times weekly. He plays video games 4-5 hours daily and does not participate in organized sports. He is sedentary at home and is often teased about his weight at school. He snores at night and his mother has noticed pauses in breathing. He denies polyuria, polydipsia, or change in appetite.
Growth Parameters
- Height: 140 cm (60th percentile)
- Weight: 58 kg (>99th percentile)
- BMI: 29.6 kg/m2 (>99th percentile, z-score +2.5)
- Blood pressure: 118/78 mmHg (>95th percentile for age/height = Stage 1 hypertension)
Physical Examination
- General: Obese male, appears stated age
- HEENT: Tonsillar hypertrophy 3+, Mallampati class III
- Neck: Acanthosis nigricans
- Cardiovascular: Normal S1/S2, no murmurs
- Respiratory: Clear
- Abdomen: Obese, no hepatomegaly palpable, striae
- Skin: Acanthosis nigricans at neck, axillae, and groin; striae on abdomen
- Musculoskeletal: Mild genu valgum (knock knees)
- Neurologic: Normal
- Tanner staging: Stage II pubic hair, Stage II genitalia (appropriate for age)
Workup
- Fasting glucose: 108 mg/dL (impaired fasting glucose: 100-125)
- Fasting insulin: 32 mIU/L (elevated, indicating insulin resistance)
- HbA1c: 5.9% (prediabetes range)
- Lipid panel:
- Total cholesterol: 210 mg/dL (elevated)
- LDL: 135 mg/dL (elevated)
- HDL: 38 mg/dL (low)
- Triglycerides: 185 mg/dL (elevated)
- AST: 52 U/L (elevated)
- ALT: 68 U/L (elevated)
- TSH: 2.8 mIU/L (normal)
Diagnosis
Obesity with metabolic syndrome (prediabetes, dyslipidemia, hypertension, suspected NAFLD) and suspected obstructive sleep apnea
Clinical Reasoning
This patient has class II obesity (BMI >=120% of 95th percentile) with multiple obesity-related comorbidities: prediabetes (impaired fasting glucose and HbA1c 5.7-6.4%), dyslipidemia, hypertension, elevated transaminases suggesting NAFLD, and symptoms of obstructive sleep apnea. The acanthosis nigricans is a marker of insulin resistance. The normal TSH and height at 60th percentile argue against endocrine causes of obesity. This represents exogenous obesity with serious metabolic consequences requiring comprehensive intervention.
Management
- Lifestyle modification (primary treatment):
- Nutrition counseling: Eliminate sugar-sweetened beverages, reduce fast food, portion control, eat breakfast
- Goal: No more than 1 hour screen time daily, 60 minutes physical activity daily
- Family-based approach: Whole family dietary changes
- Staged weight goals:
- Initial: Weight maintenance (will "grow into" weight)
- Long-term: Gradual weight loss 1-2 lbs/month
- Comorbidity management:
- Recheck BP in 1-2 weeks (confirm hypertension)
- Sleep study for OSA evaluation
- Consider metformin for prediabetes if lifestyle changes insufficient
- Monitoring:
- Monthly weight checks initially
- Repeat labs (glucose, lipids, LFTs) in 3-6 months
- Consider liver ultrasound for NAFLD assessment
- Referrals:
- Registered dietitian
- Consider pediatric obesity/weight management program
- Sleep medicine if OSA confirmed
- Mental health support: Address bullying, self-esteem issues
Clinical Image
Image Description: Clinical photograph demonstrating acanthosis nigricans, characterized by dark, velvety skin thickening in the neck folds, a marker of insulin resistance.
Source: Wikimedia Commons URL: https://commons.wikimedia.org/wiki/File:Acanthosis_nigricans.jpg License: CC BY-SA 3.0