Asthma (exam 2) Flashcards
causes of asthma
genetic disposition
environmental risk factors
what accounts for the most risk of asthma?
genetics
early phase reaction of asthma
triggered by activation of IgE
late phase reaction of asthma
6-9 hours post allergen inhalation
release of pro inflammatory mediators
characteristic symptom of asthma
wheezing - high pitched whistle sound
auscultation
listening to sounds from organs with a stethoscope
ronchi
expiratory wheezing heard on auscultation
signs of asthma
ronchi
dry hacking cough
signs of atopy (allergic rhinitis/atopic demraitits)
eosinophils and IgE in the blood
symptoms of asthma
SOB
chest tightness
coughing
wheezing
spirometry
tests lung function
measures FEV1 and FVC
FVC
forced vital capacity
max amount of air exhaled after max inspiration
FEV1
forced expiratory volume after 1 second
amount of air exhaled during the first second after max inhalation
FEV1/FVC
measures long obstruction
75-80% depending on age group
peak expiratory flow
measures how fast a patient exhales during a forceful breath
correlates with FEV1
goal of peak expiratory flow
at least 80% of patients best
green zone of PEFR
80-100% of personal best
yellow zone of PEFR
50-80% of personal best
red zone of PEFR
less than 50% of personal best
variable symptoms of asthma
worse at night and awakening
worsened by triggers
history features associated with asthma diagnosis
family history
allergic rhinitis
atopic dermatitis
an exam may be
normal or bronchi may be heard
spirometry testing for asthma
reduced FEV1/FVC
reversibility of airflow obstruction
reversibility of airflow obstruction is measured by
12% improvement of FEV1 after bronchodilator
10% change in PEF when measured bid for 1-2 weeks
inhalation drug therapy
delivers at site of action
more rapid effect
reduces side effects
some only effective this way
oral and parenteral drug therapy
used for treatment of asthma exacerbations
metered dose inhaler (MDI)
canister filled with drug
shaken before use
primed on first use
releases drug as forcible spray
soft mist inhaler (SMI)
mist that leaves inhaler slowly
inhaled via a slow deep breath
dry powder inhaler (DPI)
drug as a powder
activated when patient breathes in
Jet/ultrasonic nebulizers
produces aerosol for inhalation
spacer devices
used with MDIs
decreases need for good hand-lung coordination
how long should you wait to do the second dose (if 2 puffs needed) in an MDI inhaler?
1 minute after first puff so second can penetrate the lungs better
difference between MDI and DPI inhalers
DPI you breath quick and deeply
MDI you breathe slow
short acting beta 2 agonists
albuterol
levalbuterol
indications for SABAs
rescue inhaler (reliever)
exercise induces bronchospasms
side effects of SABAs/LABAs
tachycardia
tremor
anxiety
increase gluconeogenesis
increase insulin secretion
mild drop in K
short acting cholinergic antagonists (SAMAs)
ipratropium
ipratropium/albuterol
indication for SAMAs
COPD
asthma exacerbation in those who cannot tolerate albuterol
side effects of SAMAs/LAMAs
dry mouth
nausea
constipation
metalic taste
urinary retention
inhaled corticosteroids (ICS)
fluticasone propionate
fluticasone furoate
beclomethasone
ciclesonide
budesonide
mometasone
inhaled corticosteroids are used for
maintenance/controller therapy
which is the drug of choice for asthma?
inhaled corticosteroids!
every patient with asthma should receive one of these!
exception of everyone with asthma receiving an ICS
children 5 and under with very mild asthma
ICS are dosed based on
potency
when are inhaled corticosteroids fully effective?
within 4-8 weeks