K52.21

Clinical Causes: Consumption of specific food proteins that trigger FPIES reactions Common trigger foods include cow's milk, soy, rice, oats, and other grains Sensitive immune response to certain food proteins in susceptible infants and children

Key Symptoms: Profuse vomiting, often severe and occurring 1 to 4 hours after eating Diarrhea, which may become watery and frequent Lethargy or unusual fatigue following symptoms Paleness or pallor, potentially indicating dehydration Low blood pressure in severe cases Poor feeding or refusal to eat due to discomfort Fussiness and irritability

Diagnosis Path: Diagnosis of FPIES involves a thorough medical history and observation of symptoms following food ingestion. Key steps include: - Detailed dietary history to identify potential trigger foods - Symptom documentation correlating with specific foods - Oral food challenge in a controlled medical setting, where the suspected food is reintroduced under supervision to observe for reactions - Testing for IgE-mediated allergies is typically negative, distinguishing FPIES from other food allergies - Additional tests may include blood work to assess hydration status and rule out infections or other gastrointestinal issues

Treatment Protocols: Management of FPIES focuses on avoiding trigger foods and supporting the child's health during episodes. Recommended approaches include: - Strict elimination of identified trigger foods from the diet - Nutritional support, potentially including specialized formulas or alternative foods - Immediate medical attention during a severe reaction to provide fluids and manage symptoms - Education of caregivers about symptom recognition and appropriate responses - Regular follow-up with healthcare providers to monitor growth and re-evaluate food triggers, as some children outgrow FPIES over time - In cases of accidental ingestion leading to reactions, prompt rehydration and monitoring are crucial