Ladies, penyakit asma brongkial adalah suatu keadaan di mana saluran nafas seseorang mengalami penyempitan karena hiperaktivitas terhadap rangsangan tertentu, yang menyebabkan peradangan dan penyempitan ini bersifat sementara.
Tahukah anda? Menurut situs merckmanuals.com, sel-sel tertentu di dalam saluran udara (terutama sel mast) diduga bertanggungjawab terhadap awal mula terjadinya penyempitan ini. Sel mast di sepanjang bronki melepaskan bahan seperti histamin dan leukotrien yang menyebabkan terjadinya:
1. Kontraksi otot polos
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2. Peningkatan pembentukan lendir
3. Perpindahan sel darah putih tertentu ke bronki.
Sel mast mengeluarkan bahan tersebut sebagai respon terhadap sesuatu yang mereka kenal sebagai benda asing (alergen), seperti serbuk sari, debu halus yang terdapat di dalam rumah atau bulu binatang.
Penyakit asma brongkial juga bisa karena alergi terhadap sesuatu seperti debu, perubahan suhu, kelembaban, dan ketegangan emosi dapat meyebabkan alergi sehingga selaput yang melapisi pembuluh akan membengkak dan mengeluarkan lendir yang berlebihan sehingga pembuluh menjadi sempit dan penderita sulit bernapas. Walau serangan sesak napas dapat hilang sendiri, tetapi serangan berat bila tidak ditangani dapat menyebabkan kematian karena penderita tidak dapat bernapas.
Suatu serangan asma dapat terjadi secara tiba-tiba ditandai dengan nafas yang berbunyi, batuk dan sesak nafas. Pada kedua keadaan tersebut, yang pertama kali dirasakan oleh seorang penderita asma adalah sesak nafas, batuk atau rasa sesak di dada. Serangan bisa berlangsung dalam beberapa menit atau bisa berlangsung sampai beberapa jam, bahkan selama beberapa hari.
Oleh : Ismaya Indri Astuti
(vem/ver)

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