<unk>  is the tendency to produce an exaggerated immunoglobulin E (IgE) immune response to otherwise harmless substances in the environment. Allergic diseases are clinical manifestations of such inappropriate,<unk> c responses.<unk>  may have a hereditary component, although contact with the allergen or irritant must occur before the hypersensitivity reaction can develop (characteristically after re-exposure). Maternal psychological trauma in utero may also be a strong indicator for development of<unk> . The term<unk>  was coined by Arthur F. Coca and Robert Cooke in 1923. Many physicians and scientists use the term<unk> " for any IgE-mediated reaction (even those that are appropriate and proportional to the antigen), but many pediatricians reserve the word<unk> " for a genetically mediated predisposition to an excessive IgE reaction. The term is from Greek ἀτοπία meaning "the state of being out of place", "absurdity".
Atopy
Electrical alternans
Junctional rhythm
Hypopyon
Ectopic beat
Junctional tachycardia
Infradian rhythm
Cavitation 