Asthma

What are intrinsic asthma and extrinsic asthma?

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2009-08-07 20:06:41
2009-08-07 20:06:41

instric Asthma is when you dont need an inhaler exinstric asthma is when you do need an inhaler Traditionally, doctors have divided asthma into two general categories, Extrinsic (allergic) asthma and Intrinsic (non-allergic) asthma, depending upon the types of stimuli that trigger attacks. Extrinsic asthma is caused by an immune system response to inhaled allergens such as pollen, animal dander or dust mite particles. An allergen (or an antigen) is a foreign particle that enters the body. The immune system over-reacts to these often harmless items, forming antibodies, which are normally used to attack viruses or bacteria. Intrinsic asthma is not allergy-related and is caused by anything except an allergy. It may be caused by inhalation of chemicals such as cigarette smoke or cleaning agents, taking aspirin, a chest infection, stress, laughter, exercise, cold air, food preservatives or a myriad of other factors. The terms intrinsic and extrinsic asthma have now been replaced by terms related to the asthma trigger, since the inflammatory response of the airways is the same independent of the cause of the asthma. What was known as extrinsic asthma is now called allergic asthma, while asthma triggered by non-allergic factors, formerly called intrinsic asthma, is separated into such categories as exercise-induced asthma and occupational (chemical- induced) asthma. Inhalers may be prescribed for both allergic asthma (extrinsic) and non-allergic asthma (intrinsic).

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•Intrinsic-Both origin and insertion-contained in a particular region•Extrinsic-Acts upon a designated region,-Origin is elsewhere



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