1 yr old with fever vomiting differentials ?
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Now I'll search the library for pediatric fever and vomiting differentials in parallel.
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Based on my textbook searches, here is a structured answer on differentials for a 1-year-old with fever and vomiting.
Differentials: 1-Year-Old with Fever + Vomiting
A 1-year-old (toddler) presenting with fever and vomiting is a common but potentially serious clinical scenario. The differential is broad and must be organized systematically - never assume the cause is benign until dangerous causes are excluded.
URGENT / MUST-NOT-MISS (Red Flag Diagnoses)
| Diagnosis | Key Features |
|---|---|
| Bacterial Meningitis | Fever, vomiting, irritability, bulging fontanelle (may still be open at 12 months), photophobia, neck stiffness (often absent in infants). Between 1 month and 3 years, fever, irritability, and vomiting are the most common signs. |
| Intussusception | Episodic colicky crying, drawing up of knees, current-jelly stool, palpable sausage-shaped mass. Peak age 3 months - 3 years. Vomiting + intermittent pain is classic. |
| Meningococcal Sepsis | Fever, vomiting, non-blanching petechial/purpuric rash, rapid deterioration. |
| Urinary Tract Infection (UTI) | One of the most common hidden causes at this age - fever often the only sign; vomiting and poor feeding frequently accompany it. |
| Encephalitis | Fever, altered consciousness, seizures, vomiting. |
| Raised Intracranial Pressure / Hydrocephalus | Vomiting (often projectile), bulging fontanelle, sunsetting eyes, seizures. - Adams & Victor's Neurology |
COMMON INFECTIOUS CAUSES
| Diagnosis | Key Features |
|---|---|
| Viral Gastroenteritis (Rotavirus, Norovirus, Adenovirus) | Most common cause at this age. Diarrhea typically accompanies fever + vomiting. Day-care exposure is a clue. |
| Otitis Media | Ear pulling, irritability, decreased hearing. Fever and vomiting common at this age. |
| Tonsillitis / Pharyngitis | Throat erythema, refusal to eat, drooling. |
| Pneumonia | Fever, tachypnea, recessions, grunting. Vomiting may be the presenting symptom. |
| Sepsis | Any source. Tachycardia, poor perfusion, capillary refill >2 sec. |
IMPORTANT MIMICS
| Diagnosis | Key Features |
|---|---|
| Kawasaki Disease | Fever >5 days, conjunctival injection, strawberry tongue, rash, swollen hands/feet, lymphadenopathy. Can present with vomiting and abdominal pain mimicking a surgical abdomen. CSF pleocytosis can mimic viral meningitis. - Rosen's Emergency Medicine |
| Pyloric Stenosis | Typically presents at 2-8 weeks but late presentations possible; projectile non-bilious vomiting. |
| Diabetic Ketoacidosis (DKA) | Rare at 1 year but possible (new-onset T1DM). Vomiting, dehydration, Kussmaul breathing. |
| Intoxication / Ingestion | At 1 year, toddlers explore and ingest household substances. |
LESS COMMON BUT IMPORTANT
- Appendicitis - rare under 2 years but high mortality when it occurs (often perforated)
- Volvulus / Malrotation - bilious vomiting, abdominal distension
- Henoch-Schonlein Purpura (IgA Vasculitis) - purpura, arthritis, abdominal pain
- Febrile Seizure - post-ictal vomiting in a febrile child
- Reye Syndrome - rare; ASA use history
Approach in ED
- Vitals + Triage severity - temperature, HR, RR, SpO2, capillary refill
- Assess hydration - sunken fontanelle, eyes, skin turgor, urine output
- Look for source - examine ears, throat, chest, abdomen, skin (rash?), fontanelle
- Key investigations:
- Urine dipstick/MC&S (urine dipstick alone is unreliable at this age - catheter sample preferred)
- FBC, CRP, blood culture if unwell
- LP if meningitis suspected (after fundoscopy/clinical assessment)
- Abdominal ultrasound if intussusception considered
- Blood glucose (exclude DKA/hypoglycemia)
Clinical Pearl: At 1 year, fever + vomiting without an obvious source = UTI until proven otherwise. A normal-appearing child with only fever and vomiting still warrants urine culture.
Sources: Rosen's Emergency Medicine; Roberts & Hedges' Clinical Procedures in Emergency Medicine; Adams & Victor's Principles of Neurology; Tintinalli's Emergency Medicine; Campbell-Walsh Urology
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