When taking a patient's history, determine the type of caustic ingested, including the volume, formulation, and concentration. (See Table 3.) The time of ingestion can provide valuable information for staging of illness and planning interventions such as esophagogastroduodenoscopy (EGD). Determining whether the ingestion was intentional or unintentional is relevant because ingestions associated with a suicide attempt typically result in more severe injury.7
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