title: A prospective survey of delayed adverse reactions to iohexol in urography and computed tomography.
abstract: We investigated 7505 inpatients who underwent intravenous urography or contrast-enhanced computed tomography to assess risk factors for delayed adverse drug reactions to iohexol, a non-ionic iodinated contrast medium. Focusing on delayed adverse reactions, all adverse events were prospectively investigated for 7 days after injection of iohexol. To explore the relevant risk factors, the relationship between occurrence of adverse reactions to iohexol and 17 different variables was evaluated by logistic regression analysis. To assess the influence of seasonal factors, adverse reactions were separately evaluated during two periods: February to April (the pollinosis period in Japan) and July to September (the non-pollinosis period). The prevalence of delayed adverse events and delayed adverse reactions was 3.5 and 2.8%, respectively, whereas the prevalence of adverse events and adverse reactions was 5.7 and 5.0%, respectively. Multivariate analysis showed that six parameters had a significant influence on delayed adverse reactions to iohexol, including (a) a history of allergy, (b) season, (c) radiographic procedure, (d) age, (e) concomitant surgery or other invasive procedures, and (f) concomitant medication. The prevalence of delayed reactions was lower than in previous large-scale studies. Significant risk factors included a history of allergy and performance of radiography during the pollinosis period, suggesting that allergy was involved in delayed adverse reactions. The type of radiographic procedure also had an influence.
authors.affiliation: Department of Radiology, Showa University School of Medicine, 1-5-8 Hatanodai, Shinagawaku, Tokyo 142-8555, Japan. munetika@med.showa-u.ac.jp
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Munechika
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Hiramatsu
authors.forename: Sho
authors.initials: S
authors.lastname: Kudo
authors.forename: Kazuro
authors.initials: K
authors.lastname: Sugimura
authors.forename: Chikuma
authors.initials: C
authors.lastname: Hamada
authors.forename: Koichi
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Katayama
mesh_terms: D003287:Contrast Media / Q000008:administration & dosage / Q000009:adverse effects*; D004342:Drug Hypersensitivity / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D005260:Female; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D007275:Injections, Intravenous; D007472:Iohexol / Q000008:administration & dosage / Q000009:adverse effects*; D016015:Logistic Models; D008297:Male; D015999:Multivariate Analysis; D012307:Risk Factors; D012621:Seasons; D014057:Tomography, X-Ray Computed; D014567:Urography
chemical_list: D003287:Contrast Media; D007472:Iohexol