Food protein-induced enterocolitis syndrome
ICD-10 K52.2 · ICD-11 DA94.22

Chronic FPIES When Hypoallergenic Formula Has Not Restored Weight Gain

In chronic food protein-induced enterocolitis syndrome (FPIES), the child is exposed to the triggering food daily — typically through formula feeding — and presents with a persistent pattern of intermittent vomiting, chronic diarrhea, and poor weight gain or failure to thrive.

Clinical scenario

Chronic FPIES arises from daily ingestion of the offending food. Intermittent emesis, chronic diarrhea, and impaired growth are the hallmarks. Failure to thrive becomes the central clinical concern when the trigger is not adequately controlled.

Previous line — goals not achieved

After dietary elimination and hypoallergenic formula

The first-line approach — eliminating the trigger food, continuing breast-feeding when possible, or switching to a casein-based extensively hydrolyzed formula — aims for return to the child's usual state of health within 3 to 10 days, with resolution of vomiting and diarrhea and restored weight gain.

When those goals are not met on an extensively hydrolyzed formula, a further escalation step is indicated.

Next-line approach

For infants who continue to experience symptoms and growth failure despite an extensively hydrolyzed formula, the protocol calls for a switch to a specific, completely nonallergenic formula class — one shown to be effective in patients who have not responded to hydrolyzed formulas and in those with failure to thrive.

The full decision criteria, formula specifics, and monitoring plan are in the structured protocol.

Treatment goals

Instant Access to Structured Evidence-Based Regimens

References

DOI: 10.1016/j.jaci.2016.12.966

Occurs with daily ingestion of the food (eg, feeding with CM- or soy-based formula in an infant); symptoms include intermittent emesis, chronic diarrhea, poor weight gain, or FTT.

Ten percent to 20% might require an amino acid–based formula (AAF). AAFs are the only completely nonallergenic formulas and can be effective in patients not responding to extensively hydrolyzed formulas and those with FTT.

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