text: I-American College of Obstetricians ne Gynecologists incoma ukusetshenziswa okuqhubekayo kwemithi enqunyiwe yesifuba somoya ngesikhathi sokukhulelwa, kanti iNational Asthma Education and Prevention Program incoma ukusebenzisa i-corticosteroids ethwala umthamo ophansi lapho izimpawu zingalawulwa ngama-beta-agonists asebenza okwesikhashana.