Asthma Flashcards
What are classic symptoms of asthma?
- wheezing
- chest tightness
- coughing
What are common asthma triggers?
- pollution
- cigarettes
- cold air/weather change
- pets
- dust/pollen/cockroaches
- perfumes/cosmetics
- aspirin/NSAIDs/non-selective beta-blockers
What comorbid conditions can trigger asthma?
- infections
- allergies
- GERD
- obesity
- obstructive sleep apnea
- anxiety/stress/depression
How is asthma diagnosed?
Spirometry:
1. measure FEV1 at baseline
2. give albuterol
3. measure post-bronchodilator FEV1
4. FEV1increase > 12% post bronchodilator is consistent with asthma
What guidelines are established for treating asthma
Global Initiative for Asthma (GINA)
What is used to assess patient for initial asthma therapy?
Clinical Assessment and Treatment Step
What is step 1 symptom severity?
Daytime symptoms <2 times per month
No night symptoms
What is step 2 symptom severity?
Daytime symptoms >2x/month but less than 4-5 days/week
No night symptoms
What is step 3 symptom severity?
Daytime symptoms most days
≥ 1 night awakening/ week
What is step 4 symptom severity?
Daytime symptoms every day
≥ 1 night awakening/ week
What is a general treatment approach to asthma?
assess Q 2-6 weeks:
1. assess adherence
2. assess technique, including priming and cleaning
3. step-up, maintain or step-down treatment
once control is achieved follow up Q 1-6 months; Q 3 months with step-down therapy
What medication classes are reliever/rescue drugs?
- inhaled ICS+ formoterol (preferred)
- inhaled SABA
- systemic steroids
- inhaled epinephrine
- SAMA
What reliever medication is available OTC?
inhaled epinephrine
Why is ICS preferred in all patients for exacerbation and maintenance vs. bronchodilators?
- most effective antiinflammatory drugs
- reduces exacerbations
What drug classes are controller/maintenance?
- ICS
- LABA + ICS
- Leukotriene receptor antagonists (LTRA) PO
- Theophylline PO/IV
- LAMA (Add on)
- injectable monoclonal antibodies SC/IV
What monoclonal antibody is for severe allergic asthma?
Omalizumab
What monoclonal antibodies are for severe eosinophilic asthma?
- mepolizumab
- reslizumab
- benralizumab
- dupilumab
What monoclonal antibody is used in severe asthma regardless of eosinophil count/ other markers?
Tezepelumab
What is initial therapy for step 1?
- prn low-dose ICS+ formoterol
OR - SABA + low-dose ICS
What is initial therapy for step 2/ needing SABA > 2 times/month?
- prn low-dose ICS+ formoterol
OR - prn SABA + low-dose ICS+ low dose ICS scheduled
OR - prn SABA + low-dose ICS+ LTRA
What is initial therapy for step 3?
- prn and scheduled low-dose ICS + formoterol
OR - prn SABA +ICS AND scheduled low dose ICS +formoterol
- low-dose ICS + LTRA
- Medium-dose ICS
What is initial therapy for step 4/ initial presentation is exacerbation?
- prn low-dose ICS + formoterol AND scheduled medium-dose ICS + formoterol
- prn low-dose ICS + formoterol AND scheduled medium-dose ICS + LABA
- prn low-dose ICS + SABA AND scheduled medium-dose ICS + formoterol +LRTA/tiotropium
- high-dose ICS
What is the initial treatment for step 5?
- prn low-dose ICS + formoterol AND scheduled high-dose ICS + formoterol
- prn low-dose ICS + SABA AND scheduled high-dose ICS + LABA
- prn low-dose ICS + SABA AND scheduled high ICS + formoterol +tiotropium/oral steroid/injectable treatments
albuterol
- ProAir HFA
- ProAIr Respiclick (DPI)
- Proventil HFA
- Ventolin HFA
Salmeterol
Severevent Diskus (DPI)
Levalbuterol
Xopenex HFA
Beclomethasone
QVAR RediHaler
Budesonide
Pulmicort Flexhaler (DPI)
Pulmicort Respules (nebulizer)
Budesonide+ formoterol
Symbicort (DPI)
Breyna (DPI)
Fluticasone
Flovent HFA
Flovent Diskus (brand D/C)
Arnuity Ellipta (DPI)
ArmonAir Digihaler (DPI)
Fluticasone+salmeterol
Advair Diskus
Advair HFA
Fluticasone + vilanterol
Breo Ellipta
Mometasone + formoterol
Dulera
Mometasone
Asmanex HFA
Asmanex
Ciclesonide
Alvesco
What are SEs of beta-2 agonists?
- nervousness
- tremor
- tachycardia
- palpitations
- cough
- hyperglycemia
- hypokalemia
What are warnings with SABAs?
Use caution in:
1. CVD
2. glaucoma
3. hyperthyroidism
4. seizures
5. diabetes
What are monitoring parameters for SABAs?
- # of days of SABA use
- sx frequency
- peak flow
- pulmonary function tests
- BP
- HR
- blood glucose
- K+
What is an important counseling point for MDI (HFA) use?
shake well before use
What is the difference between levalbuterol vs. albuterol?
Levalbuterol contains the R-isomer of albuterol
What are boxed warnings with LABAs?
- increased risk of asthma-related deaths; should only be used in asthma patients already receiving but not controlled on inhaled corticosteroids
- increased risk of asthma-related hospitalization in pediatric and adolescent patients
What is the MOA of beta-2 agonists?
beta-2 agonists bind to beta-2 receptors –> relaxation of bronchial smooth muscle–> bronchodialation
Epinephrine
Asthmanefrin Refill
Why should inhaled epinephrine not be used?
non-selective beta-agonist; FDA-approved for mild asthma symptoms in intermittent asthma only
Albuterol+ budesonide
Airsupra
What is the MOA of ICS?
inhibit inflammatory response
What are warnings with ICS?
- high doses for extended periods of time can cause adrenal suppression
- immunosuppression
- increased risk of fractures
- growth retardation
What are SEs of ICS?
- dysphonia (difficulty speaking)
- oral candidiasis (thrush)
- cough
- headache
- hoarseness
- URTIs
- hyperglycemia
What are the monitoring parameters with ICS?
- use of SABA/ rescue inhaler
- sx frequency
- peak flow
- growth (children)
- s/sx of renal insufficiency
- s/sx thrush
- bone density
What can be done to decrease the risk of thrush?
- rinse mouth with water and spit out each time ICS used to prevent thrush
- use a spacer with MDI ICS
What is the only ICS available as a nebulizer suspension?
Budesonide (Pulmicort Respules)
How is Pulmicort Respules used?
only use with a jet nebulizer connected to an air compressor; DO NOT use an ultrasonic nebulizer
Why should QVAR RediHaler not be shaken or used with a spacer?
breath-activated aerosol with characteristics of MDi and DPI
Which ICS contains built-in electronic module that detects, record, and stores data (detects when inhaler is used and measures inspiratory flow)?
- ArmonAir Digihaler (fluticasone)
- AirDuo Digihaler (fluticasone+ salmeterol)
What is a low daily dose of Beclomethasone MDI 40 or 80 mcg/inh?
100-200 mcg
What is a medium daily dose of Beclomethasone MDI 40 or 80 mcg/inh?
> 200-400mcg
What is a high daily dose of Beclomethasone MDI 40 or 80 mcg/inh?
> 400 mcg
What is a low daily dose of Budesonide DPI 90 or 180 mcg/inh?
200-400 mcg
What is a medium daily dose of Budesonide DPI 90 or 180 mcg/inh?
> 400-800 mcg
What is a high daily dose of Budesonide DPI 90 or 180 mcg/inh?
> 800 mcg
What is a low daily dose of Ciclesonide MDI 80 or 160 mcg/inh?
80-160 mcg
What is a medium daily dose of Ciclesonide MDI 80 or 160 mcg/inh?
160-320 mcg
What is a high daily dose of Ciclesonide MDI 80 or 160 mcg/inh?
> 320 mcg
What is a low daily dose of Fluticasone MDI/DPI?
100-250 mcg
What is a medium daily dose of Fluticasone MDI/DPI?
> 250-500 mcg
What is a high daily dose of Fluticasone MDI/DPI?
> 500mcg
What is a low daily dose of Mometasone MDI 100/200 mcg/inh?
200-400 mcg
What is a medium daily dose of Mometasone MDI 100/200 mcg/inh?
200-400 mcg
What is a high daily dose of Mometasone MDI 100/200 mcg/inh?
> 400 mcg
What is a low daily dose of Mometasone DPI 110/220 mcg/inh?
110-220 mcg
What is a medium daily dose of Mometasone DPI 110/220 mcg/inh?
> 220-440 mcg
What is a high daily dose of Mometasone DPI 110/220 mcg/inh?
> 440
How can MDIs be identified by brand name?
HFA, Respimat, or no suffix (ex. symbicort, dulera)
How can DPIs be identified by brand name?
Diskus, Ellipta, Pressair, HandiHaler, RespiClick, Flexhaler
Which MDIs can a spacer not be used with?
- QVAR RediHaler
- Respimat products
Which MDIs do not need to be shaken before use?
- QVAR RediHaler
- Alvesco
- Respimat products
- Atrovent HFA
Which DPI requires priming?
Flexhaler
What is the MOA of montelukast?
inhibits leukotriene D4 (LTD4)–> reduce airway edema, constriction, and inflammation
What is the MOA of zafirlukast?
inhibits leukotriene D4 and leukotriene E4
What is the MOA of Zileuton?
inhibits 5-lipoxygenase–> inhibits leukotriene formation
What are boxed warnings with montelukast?
neuropsychiatric events (serious behavior/mood changes including suicidal thoughts and actions)
What are indications for montelukast?
- asthma
- allergic rhinitis
- exercise-induced bronchospasm
Montelukast
Singular
Zafirlukast
Accolate
Zileuton
Zyflo
What are warnings with all leukotriene modifying agents?
- neuropsychiatric events: monitor for signs of aggressive behavior, hostility, agitation, hallucinations, depression, suicidal thinking
- systemic eosinophilia (montelukast, zafirlukast)
What are SEs with all leukotriene modifying agents?
- headache
- dizziness
- abdominal pain
- elevated LFTs
- URTIs
What is dosing for montelukast ages 1-5?
4 mg daily in the evening
What is dosing for montelukast ages 6-14?
5mg daily in the evening
What is doing for montelukast age 14+?
10 mg daily in the evening
What is the dosing of montelukast for exercise-induced bronchospasm?
5 mg (6-14 y/o) or 10 mg (≥15y/o) 2 hours before exercise
What dosage forms does montelukast come in?
- tablet
- chewable tablet
- packet (granules)
How can Montelukast granules administered?
- directly in the mouth
- dissolved in a small amount (~5mL) of breast milk or formula
- mixed with a spoonful of applesauce, carrots, rice, or ice cream (nothing else)
USE WITHIN 15 MINUTES OF OPENING PACKET
How must zafirlukast be dispensed?
in original container –> protect from moisture and light
What should be monitored when taking zafirlukast/zileuton?
LFTs
What should be monitored when taking montelukast?
behavior changes
How is montelukast affected by CYP metabolism?
- minor substrate of CYP3A4, CYP2C8, and CYP2C9
- weak inhibitor of CYP2C8, and CYP2C9
- gemfibrozil will increase the concentration of montelukast
- lumacaftor can decrease levels of montelukast
How is zafirlukast affected by CYP metabolism?
- Major substrate of CYP2C9
- moderate inhibitor of CYP2C9 and weak inhibitor of CYP2C8
- can increase levels of theophylline
- increase levels of CYP2C9 substrates (warfarin)
How is zileuton affected by CYP metabolism?
- minor substrate of CYP1A2 and CYP3A4
- weak inhibitor of CYP1A2
- can increase levels of theophylline, propranolol, and warfarin
What is the MOA of theophylline?
blocks phosphodiesterase–> increase in cAMP and increased epinephrine from adrenal medulla –> bronchodilation
What are the active metabolites of theophylline?
- caffeine
- 3-methylxanthine
What is a therapeutic level of theophylline and how is it measured?
5-15mcg/mL; measure peak level at steady state (after 3 days of oral dosing)
What is dosing for theophylline?
LD: 5 mg/kg (IBW; unless TBW<IBW)
Maintenance: 300-600 mg QD
What are warnings with theophylline?
can exacerbate cardiovascular arrhythmias, PUD, and seizure disorders
What are SEs with theophylline?
- N/V
- headache
- insomnia
- increased HR
- tremor
- nervousness
What are signs of toxicity from theophylline?
- persistent vomiting
- arrhythmias
- seizures
What should be monitored when taking theophylline?
- theophylline levels
- HR
- CNS symptoms (insomnia, irritability)
- use of rescue inhaler
How much theophylline is in aminophylline?
2:1 –> theophylline: ethylenediamine
How are theophylline and aminophylline interconverted?
aminophylline x 0.8= theophylline
theophylline / 0.8= aminophylline
ATM (Aminophylline to Theophylline Multiply)
Theophylline has first-order kinetics followed by zero-order kinetics, what does this mean for dosing?
in the higher end of the therapeutic range, small dose increases can result in large concentration increases
How is theophylline affected by CYP metabolism?
- Major substrate of CYP1A2
- Minor substrate of CYP 3A4 and CYP2E1
What medications increase theophylline levels?
inhibitors of CYP1A2:
1. ciprofloxacin
2. zileuton
3. fluvoxamine
4. propranolol
Other drugs:
5. zafirlukast
6. alcohol
7. allopurinol
8. disulfiram
9. estrogen-containing OCs
10. methotrexate
11. pentoxifylline
12. propafenone
13. verapamil
Which CYP3A4 inhibitors can increase levels of theophylline?
- clarithromycin
- erythromycin
What drugs can decrease theophylline levels?
- carbamazepine
- phenytoin
- fosphenytoin
- phenobarbital
- primidone
- rifampin
- ritonavir
- marijuana smoking
- st.johns wart
- levothyroxine
What drug can theophylline decrease levels of due to increased renal excretion?
lithium
What conditions or food can increase theophylline (by reducing clearance?
- CHF
- cirrhosis/ liver disease
- fever
- acute pulmonary edema
- cor pulmonale (pulmonary heart disease)
- hypothyroidism
- shock
- high carb/low protein diet
What conditions or food can decrease theophylline (by increasing clearance?
- low carb/ HIGH PROTEIN diet
- daily consumption of charbroiled beef
- cystic fibrosis
- hyperthyroidism
Omalizumab
Xolair
Mepolizumab
Nucala
Reslizumab
Cinqair
Benralizumab
Fasenra
Fasenra pen
Dupilumab
Dupixent
Rezepelumab
Tezspire
How is omalizumab administered?
- initiated in a healthcare setting under medical supervision (≥3 doses)
- SC every 2 to 4 weeks based on body weight and pretreatment IgE levels
- must have documented allergic asthma with a positive skin test or in vitro reactivity to an aeroallergen
What boxed warnings does omalizumab have?
anaphylaxis( can occur at any time during treatment); must be observed after administration
What is the MOA of omalizumab?
IgG monoclonal antibody; inhibitors IgE binding to the receptor on mast cells and basophils
What is the MOA of interleukin receptor antagonist?
blocks interleukins (cytokines responsible for growth, differentiation, recruitment, activation, and survival of eosinophils) to reduce inflammation; block IL-5 (except dupilumab)
What is the MOA of dupilumab?
blocks interleukins (cytokines responsible for growth, differentiation, recruitment, activation, and survival of eosinophils) to reduce inflammation; block IL-4 and 13
Which agents are interleukin receptor antagonists?
- mepolizumab
- reslizumab
- benralizumab
- dupilumab
How is mepolizumab administered?
SC Q 4 weeks
How is reslizumab administered?
IV Q 4 weeks
How is benralizumab administered?
SC Q 4 weeks x 3 doses then Q 8 weeks
How is dupilumab administered?
SC every other week
Which monoclonal antibodies can be administered at home by the patient/ caregiver?
- mepolizumab
- dupilumab
- Faserna pen (benralizumab)
- tezepelumab
Which interleukin receptor antagonist has a boxed warning for anaphylaxis?
Reslizumab (IV)
How is exercise-induced bronchospasm treated?
SABA or low-dose ICS+ fomoterol 5-15 minutes before exercise
How long will effects of a SABA last?
2-3 hours
How long will effects of ICS+ formoterol last?
up to 12 hours
What agent can be beneficial if a longer duration of exercise is expected with EIB?
salmeterol +ICS
How should Salmeterol+ ICS be administered for EIB?
take 30 minutes before exercise
How is montelukast used for EIB?
- can be taken 2 hours before exercise and lasts up to 24 hours
- DO NOT take additional doses for EIB if already taking for another indication
How is asthma treated in pregnancy?
- keep control, do not escalate
- ICS prn or daily
How long should an albuterol inhaler last with good asthma control?
12 months (3-4 months with Ventolin 60 inhalations/canister)
How long should a patient wait if prescribed multiple doses of inhaled medications?
wait 60 seconds between each inhaled dose
What order should asthma medications be given in?
- SABA
- LABA/LAMA
- ICS
waiting 60 seconds in between each inhalation
What are the types of nebulizers?
- jet
- ultrasound
- mesh