asthma drugs clinical pharmacology
TRANSCRIPT
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1. inhaled
corticosteroids direct
MOA
inhibit (cytokine-induced)
production of inflammatory proteins
2. pharm agents causing ASA, Beta blockers
3. physical triggers cold air, exercise
4. physiologic triggers(4)
stress, GERD, URI, rhinitis
5. factors influencing
dev/exp - host
genetic, gender, obesity
6. inflam cells in asthma mast, eosino/baso/neutrophils,
platelets, TH2
7. mediators histamine
LTE
Kinins, endothelin, prosanoids
8. diagnosis >12% reversibility or increase in
FEV1 of 200c
9. obstructive pattern reduced FEV1/FVC ratio w/ albuterol
10. restrictive pattern reduced FVC (normal ratio) w/
albuterol
11. methacholine
challenge
bronchoprovocative test;
20% or more decrease in FEV1
12. Severe asthmatic
episode - ABG
pH down
paCo2 down
pa02down
HCO3 way down
13. sputum eosinophils, charcot-leyden crystals,
inc IgE
14. chest xray inc AP diam, dark (translucent)
fields, depressed/flat diaphragm
15. Step 1 - 4; symptom
freq
1; 2x per week
3; daily
4; continual
16. Zone mgmnt
green/yellow/red
patient self monitoring system
17. asthma classifications allergic, exercise induced, nocturnal
18.
non drug treatment,avoid triggers & treat
aggravating
allergies, GERD, rhinitis, viral RI
19. drug types for asthma
(6)
beta agonists, corticosteroids, mast
cell stabilizers, LTE modifiers,
theophylline, anti IgE ab's
20. Beta 2 agonists MOA G-protein receptors activates
adenylyl cyclase/cAMP - >
intercellular Ca ->
bronchodiliation & mast cell
stabilization
21. mast cells filled w/ basophil granules
22. short acting beta agonists relax smooth muscle,
inc airflow in 30 sec; DOC for
attacks
23. indicates inadequate
control
> 1 canister/mth SABA
24. dosing positive response is 200 ml increase or 12%
increase in FEV1
25. Beta2 agonists SE tremor
heart palps
hypokal
O2 sat reduction
26. SABAs - ALPMT
(short goats on alp
mountains)
Albuterol
Levalbuterol
Pirbuterol
Metaproterenol
Terbutaline
27. dosing levalbuterol
(Xopenex) - only R
isomer/active
half of racemic albuterol - 0.63
mg, 1.25 mg (3X cost)
28. LABAs - AFAS Albuterol ER
Formoterol
Aformoterol,
Salmeterol,
29. LABA's considerations not monotherapy;
only if cannot be controlled
otherwise
shortest duration & taper off
30. LABAs - COPD only Formoterol
Aformoterol
31. combo LABA &
corticosteroids (3)
Symbicort, Dulera, Adv air
32. Symbicort Formoterol & Budesonide
33. Advair Salmeterol & Fluticasone
34. Dulera Formoterol & Mometasone
(asthma only)
35. combo LABA & steroid for
asthma only
Dulera
36. inhaled corticosteroids
direct MOA
inhibit cytokine (ind uced
prod of pro-inflamm proteins)
37. inhaled corticosteroids
indirect MOA (4)
alter m-RNA prod
suppress inflam
produce anti-inflam mediator
increase B2 receptors,
decrease mucous
38. mild asthma - once a day
inhaled steroid options
budesonide
ciclesonide
mometasone furoate
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39. corticosteroids
SEs
thrush; hypergly
adrenal suppress
osteoporosis
elev WBC
40. corticosteroids -
dosing therapy
oral or IV "burst" therapy
41. corticosteroids
dosing strategylong term
step down: after controlled
dec 25% every 2 wks (8wks min)
42. methylxanthines
include
caffeine, theophylline, theobromine
43. methylxanthine -
indication
adjuvant to inhaled steroids
alt to LABA to control nocturnal
symptoms
44. methylxanthines
MOA (3)
phosphodiesterase inhib, inc CAMP->
inhibits LTE broncho/vasodilate, cardiac
stim, vasodilate
blockade adenosine receptors
Ca+ released from sarcoplasm
45. theophylline SE's -
7 NITSCHA
N/V
insomnia
tremors
seizures
confusion
HA
arrhyth
46. theophylline -
concern
narrow therapeutic window; monitor
conc
47. theophylline -
interaction
is a Cyp 450 substrate; many interactions
48. theophylline -
CYP450
interaction
causes
inhibitors inhibit liver metabolism;
increase Theo levels
inducers enhance ......cause decreased
Theo
49. theophylline -
avoid CY450
INHIBITORS
(inhibited hide
FACE Very well)
Fluvoxamine
Amiodarone
Cipro
Erythromycin
Verapamil
50. theophylline -
avoid CY450
INDUCERS
(PCPR - induce
halluc)
Phenytoin
Phenobarbital
CBZ
Rifampin
51. theophylline -
disease state
interactions
smoking, hyperthy - dec Theo
CHF, liver disease - inc Theo
52. cromolyn (intal) - class
nedocromil (tilade)
mast cell stabilizer
(no inherent bronchodilation)
53. cromolyn MOA blocks Cl channels
blocks histamine release from
mast cells
54. cromolyn SE bad taste; GI
55. Montelukast (Singulair) -
class
Zafirlukast (Accolate)
LTE receptor antagonists
56. Zileuton (zyflo) - class LTE receptor antagonists
5-lipoxygenase inhibitor -
reduces synthesis
57. Zileuton (zyflo) interaction inhibits metabolism of
theophylline & warfarin
(increases levels)
58. LTE antagonists - not
indicated for
acute attacks
59. Montelukast vs Zafirlukast Montelukast more favorable;
can be used in kids 2-5 yrs
60. Ipratropium - class antimuscarinic (atropine - like)
61. Ipratroprium - indication quick relief; additive to beta
agonists
62. Omalizumab (xolair) - class IgE antibody inhibitor
63. Omalizumab MOA binds IgE on mast
cells/basophils; prevents
release
64. Omalizumab - indication persistent, mod-severe
allergic asthma not controlled
on oral steroids
65. Omalizumab dosage every 2-4 weeks; half-life 26
days
66. Omalizumab concern very expensive
67. Omalizumab dosage based
on
IgE serum levels -but 1+ yr
post treat
68. Omalizumab SE HA
injection site rxn
URI arthralgia
69. MOA of Omalizumab
(Xolair)?
Inhibits binding of IgE to the
high affinity IgE receptor onsurface of mast cells and
basophils
70. Which type of patient
should use Omalizumab
(Xolair)?
Patient with moderate-severe
persistant allergic asthma not
controlled by inhaled steroids
71. When prescribing Inhibitors
of IgE antibodies, what
should the dosing be based
on?
IgE serum levels and body
weight
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72. T/F: Inhibitors of IgE antibodies are cost
effective for the patient
False: They are about $600 per 1 150mg. vial
73. Intermittent Asthma - Step 1 Tx SABA as PRN
74. Intermittent Asthma - Step 1, w/ mod/sev viral
inf Tx
SABA PRN
short course systemic steroids
75. mild persistent asthma - Step 2 Tx daily long term control
inhaled steroids or (cromolyn or nedocromil)
Zafirlukast or zileuton in adults (12+YOA)
76. mod persistant asthma - Step 3 Tx increased inhaled steroids or
add LABA or
add nedocromil
77. mod persistant asthma - Step 3 not controlled
Tx
increase to high dose inhaled steroids
add LABA (servent or theophylline)
78. severe persistent asthma - Step 4 Tx Add oral systemic steroids
monitor closely
79. LABA black box warning inc risk for asthma-related deaths; only for uncontrolled (w/ inhaled corticostero
or 2+ maintenance meds)
80. Acute asthma exacerbation; FEV1 or PEF < 50% -Tx
O2 90-95% satinhaled SABA or cont albuterol
oral systemic steroids (prednisone)
anti-cholinergics (never alone)
81. which drugs specifically not recommended for
acute asthma
methylxanthine/theophylline
mucolytic
sedation
abx
82. aggressive hydration in acute asthma not reco'd adu lts; maybe infants/children