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Asthma- a lung disease characterized by bronchial hyperresponsiveness with…

- - - - causes vasodilation, and increasing permeability (runny nose)
    - - cause itching
    - - causes bronchial spasms and airway narrowing
    - - causes mucus production
- - - - PaCo2 normalizes then incr. to produce respiratory acidosis
        
        can lead to resp failure
- - - - FEV1 60-80%
      - sxs daily
      - NA >1/wk, not nightly SABA Daily
      - FEV1/FVC reduced by 5%
      - some limitation
      - step 3b
    - - sxs continuous
      - NA often 7/wk SABA several times/day
      - Extremely limited
      - FEV1< 60%
      - step 4 or 5b
    - - sxs > 2 days/wk, not daily
      - NA < =3-4/mo SABA use > 2 days/wk, not daily
      - normal activity minor limitation
      - FEV1> 80%
      - FEV1/FVC normal
      - step 2
- - - - added in serious attacks
- - - - <200L/min indicate severe obstuction
      - severe attack: <50% predicted or best
    - - "silent chest" immediately notify HCP
    - - stay with pt
      - have a calm, quiet, reassuring attitude
    - - keeps airway open by maintaining positive pressure