What is the definition or description of: hetastarch allergy?

IV Blood vol expande: Signs Allergic Rxn to Hetastarch (Hespan)= Blood Volume expander Hives, difficulty breathing, swelling of face-lips -tongue - throat. Chest pain, easy bruising that will not stop. Rare serious AE = severe headache, mental status changes, vision, speech probs trouble swallowing, loss of feeling in your face red purple skin rash that spreads to face and upper body kidney failure NOT A COMPLETE LIST