Atonic
Atonic: Without normal muscle tone or strength. An atonic seizure is one in which the person suddenly loses muscle tone and strength; the person cannot sit or stand upright and, unless supported, falls down.
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- Atonic seizure
Atonic seizure: A seizure in which the person suddenly loses muscle tone and strength and, unless supported, falls down. Also called drop attack or drop seizure. Atonic means a lack of muscle tone and strength.
- Atopic
Atopic: A predisposition toward developing certain allergic hypersensitivity reactions. Atopy may have a hereditary component, although contact with the allergen must occur before the hypersensitivity reaction can develop.
- Atopic dermatitis
A skin disease characterized by areas of severe itching, redness, scaling, and loss of the surface of the skin. Atopic dermatitis is the most common of the many types of eczema. Atopic dermatitis is frequently associated with other allergic disorders, especially asthma and hay fever. A defect of the immune system within the skin has […]
- Atopy
Atopy: The genetic tendency to develop the classic allergic diseases — atopic dermatitis, allergic rhinitis (hay fever), and asthma. Atopy involves the capacity to produce IgE in response to common environmental proteins such as house dustmite, grass pollen, and food allergens. From the Greek atopos meaning out of place.
- Atresia
Atresia: Absence of a normal opening, or failure of a structure to be tubular. Atresia can affect many structures in the body. For example, esophageal atresia is a birth defect in which part of the esophagus is not hollow, and with anal atresia, there is no hole at the bottom end of the intestine.