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 Alerjik Hastalıklar
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Alerjik Hastalıklar

ALLERJİ NEDİR ?

Allerji, normalde zararsız olan maddelere karşı anormal ve zararlı bağışıklık sistemi cevapları vermektir.

Bu karmaşık cümle ne anlama gelir? Bir örnekle açıklayalım: Bitki polenleri normalde insanlar için zararlı olmayan taneciklerdir. Ancak bazı kişilerde polenlere maruziyet nezle şikayetlerinin ortaya çıkmasına neden olur. Bu olay “allerji”, böyle kişiler de “atopik bünyeli” olarak adlandırılmaktadır.
Atopi; normalde zararsız olan maddelere karşı, “İmmunglobulin E” adı verilen bağışıklık sistemi maddelerinin aşırı miktarda yapılması özelliğidir.

 

Bu özellik genetik olarak kazanılmaktadır. Diğer bir deyişle atopik bünyeli bir kişi, allerjik hastalık gelişimine neden olan bu özelliğini anne ya da babasından geçen genlerle almaktadır.

Kişinin allerjik olup olmaması sadece genetik faktörlere bağlı değildir. Kalıtıma ek olarak “çevre”nin de allerji gelişiminde önemli bir rol oynadığı görülmektedir.

 

Belli bir zaman süresince belli bir allerjenle yüksek düzeyde karşılaşan bir kişinin o allerjene karşı duyarlılık kazanma şansı, daha az karşılaşan kişiye göre daha fazladır. Örneğin, erken yaşlarda yüksek miktarda ev tozu akarıyla karşılaşmanın, daha sonra ev tozu akarına allerjik olma riskini dramatik olarak arttırdığı kesin olarak gösterilmiştir.

Ayrıca, özellikle sigara dumanı başta olmak üzere bazı irritanlara maruziyet allerjenlere duyarlılaşmada önemli rol oynamaktadır.

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