Asthma Flashcards
What is the most common chronic dz in childhood?
Asthma
Asthma sx’s
- Wheezing (expiratory)
- Cough (nocturnal)
- Dyspnea
* Non-specific
Asthma Dx
- Hx of respiratory sx’s AND
- Demonstration of variable, reversible*, expiratory airflow obstruction
- History + Physical AND spirometry
What is one of the biggest risks factors for having asthma?
Atopy
- Genetic association
- Predisposition toward developing certain allergic hypersensitivity rxn
- -> i.e. atopic dermatitis
Atopic triad
- Allergy- Allergic rhinitis, nasal polyps (ASA allergy??)
- Asthma
- Eczema- Atopic dermatitis
What is the gold standard diagnostic test?
Spirometry/PFTs
What does FEV1 tell you?
Forced expiratory volume in 1 sec
Tells you the Severity of obstruction
What is a normal FEV1 value?
> or equal to 80%
What is a normal FVC value?
> or equal to 80%
What FEV1/FVC ratio percentage indicates obstructive disease?
<70%
What FEV1 value is considered mild obstruction?
> 70%
What FEV1 value is considered moderate obstruction?
50-69&
What FEV1 value is considered severe obstruction?
<50%
What determines reversibility?
Bronchodilator (albuterol)
What increase in FEV1 after given a bronchodilator is diagnostic of asthma?
12% or more
What is a good test to perform if a patient has normal baseline flows, but you are suspicious of asthma? How does it work?
Bronchoprovocation testing
- Inhale methacholine or mannitol
- Trying to trigger/induce asthma exacerbation
What is the Diagnostic Approach-Symptom categorization
- Sx frequency
- Nighttime awakening
- Need fo short acting beta-agonist
- Interference with normal activity