title: Severe anaphylactoid reaction to radiographic contrast media. Recurrences despites premedication with diphenhydramine and prednisone.
abstract: Patients with a history of anaphylactoid reaction to radiographic contrast medium (RCM) are at increased risk for subsequent reaction. To date, 275 of these high-risk patients have been studied with use of prophylactic pretreatment with diphenhydramine hydrochloride or prednisone or both without a single severe anaphylactoid reaction on readministration of RCM. This report describes a patient who received pretreatment as described in the literature but suffered a life-threatening anaphylactoid reaction on readministration of RCM. Premedication does not eliminate the possiblity of a fatal reaction on readministration of RCM.
mesh_terms: D000707:Anaphylaxis / Q000139:chemically induced* / Q000517:prevention & control; D003287:Contrast Media / Q000009:adverse effects*; D004155:Diphenhydramine / Q000008:administration & dosage*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011241:Prednisone / Q000008:administration & dosage*; D011292:Premedication; D012008:Recurrence; D012306:Risk
chemical_list: D003287:Contrast Media; D004155:Diphenhydramine; D011241:Prednisone