Respiratory 3 Flashcards
(212 cards)
when is ipratropium bromide contraindicated?
closed angle glaucoma
urinary retention eg BPH
side effects of ipratropium bromide / antimuscarinics?
arrythmia dizziness blurred vision glaucoma G| upset
side effects of salbutamol?
tachycardia, arrythmia
hypokalaemia esp in diabetes
an example of a long acting beta 2 agonist?
salmeterol
oladaterol
what drugs interact syngerstically with steroids?
beta agonists
steroids = increased expr of beta2receptor
beta agonist = increased expression of steroid receptor
as well as relax smooth muscle, what else do beta 2 agonists do?
reduce histamine release
what is pirfenidone?
antifibrotic
for advanced resp conditions
what is theophylline?
phosphodiesterase inhibitor
bronchodilation
reduces reactivity to histamine
what is carbocysteine?
mucolytic
type 1 vs type 2 resp failure?
type 1 = low O2
type 2 = low O2 high CO2, resp acidosis
how can you tell if a respiratory acidosis is chronic?
the bicarbonate will be raised, kidneys trying to compensate, but this can’t happen immediately so you only see it in chronic
5 triggers for asthma?
infection exercise cold air dust damp pollen emotion tobacco beta blockers aspirin
what kind of hypersensitivity reaction is asthma?
type 3 / type 1
what cells/molecules are involved in asthma?
cytokines = IgE and mast cells
mast cells release histamine, prostaglandins, leukotrienes
and attract eosinophils
what happens in the late response of asthma?
immune mediators damage the epithelium
why is airflow reduced in asthma?
bronchoconstriction & mucus
is asthma reversible?
initially, yes
over time inflammatory reactions mean the basement membrane becomes thicker and fibrosed, = permanently reduced diameter, then it is not reversible
what does an asthma attack look like?
trigger worsening SOB tachynoea using accessory muscles tachycardia
what is the wheeze like in asthma?
polyphonic
bilateral
widespread
episodic
what does spirometry show in asthma?
FVC fairly normal
FEV1 is low, less than 80% of expected
FEV1/FVC ratio less than 0.7
improves with bronchodilators eg salbutamol
- 12% increase in FEV1, 200ml increase in vol
worsens with histamine/metacholine challenge, which causes hyperreactivity
what is FENO, how is it used?
fractional exhaled nitrogen oxide
more than 40 is pos
can be used in investigation of asthma
what is first line for asthma?
SABA eg salbutamol
what is second line for asthma?
inhaled corticosteroid eg beclamethosone
what are some third line options for asthma?
- montelukast
- laba eg salmeterol (need to be taking saba too)
theophylline
lama
more steroid