Respiratory Pharmacology Flashcards
Asthma characteristics
- Increase mucous production
- Hyper responsive airways causing broncho-constriction
- Marked airway inflammation
What are the key player in Asthma?
- Mast cells
- IgE
- Immune cells
Early phase of Asthma
Allergen that leads to mast cell deregulation releasing histamine, luekotrienes, interlukeins, and PGE which creates bronco spasms.
Progression of Early phase Asthma to Late phase Asthma
infiltration of inflammatory cells: release cytokines, interleukin, and other inflammatory mediators
Late phase Asthma
- Airway inflammation leading to airflow limitation leading to bronchospasm and increase airway responsiveness
- Edema
- endothelial injury
- Impaired mucocillary function
Symptom Triggers of Asthma
- Upper Respiratory viral infections
- allergens
- exercise
- stress
- Exposure to inhaled irritants
- GERD
- Aspirin
- Exposure to sulfates (wine)
How does Aspirin cause an Asthma attack?
Aspirin causes a pseudo reaction to NSAIDS by inhibiting COX 1 and initiating COX 2 and can take up to 20 minutes to 3 hours
If a patient needs to be on aspirin what can we prescribe the patient to prevent an asthma attack
Monoleucast (singular)
Diagnostic Criteria for Asthma
- The presence of symptoms consistent with asthma: wheezing, SOB, cough, chest tightness
- The presence of variable airflow limitation
- measured by spirometry
- Reversibility of airflow
Factors increasing risk for asthma exacerbation
- Uncontrolled Asthma symptoms
- Use of more than 200 meter dose short acting bronchodilator canisters a month
- Inadequate inhaled corticosteroids
- Cost
Classification of Asthma: Intermittent
Less than 2 days per week, air flow normal
Classification of Asthma: Mild Persistent
More than 2 days a week but not daily spirometry is normal
Classification of Asthma: Moderate Persistent
Daily symptoms and 60-80 % normal airflow
Classification of Asthma: severe persistent
continual symptoms; results of peak flow spirometry is less than 60 % normal
GINA asthma criteria steps
- Assess
- Adjust
- Review
GINA step 1: Preferred controller
- As need low dose ICS- Formoterol
GINA step 2: Preferred Controller
- Daily low dose inhaled corticosteroid
2. or as needed ICS- Formoterol
GINA step 3: Preferred Controller
- Lose dose ICS and LABA
GINA step 4: Preferred Controller
- Medium dose ICS and LABA
GINA step 5: Preferred Controller
- High dose ICS and LABA
2. Refer to phenotypic assessment
GINA Preferred Step Reliever for Stage 1 and 2
As needed low dose ICS formoterol
Stage 1
Symptoms less than twice a month
Stage 2
Symptoms twice a month or more but not daily
Stage 3
Symptoms most days or walking with asthma once a week or more
Stage 4
Symptoms most days or walking with asthma once a week or more, and low lung function
Preferred Reliever Stages 3-5
As needed low dose ICS-formoterol for patients prescribed maintenance and reliever therapy