Respiratory Flashcards

(53 cards)

1
Q

Antihistamines- Therapeutic uses

A

Therapeutic Uses-
Mild allergy/Seasonal allergic rhinitis
Severe allergy
Benefits may be limited, use as adjunct only,
Motion sickness,
Insomnia,
Common cold
Anticholinergic effects decrease rhinorrhea. Not cure to treat symptoms

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2
Q

Antihistamines- Adverse Effects

A

Sedation(First generation more than second and third generations)
Dizziness, incoordination, confusion, fatigue, GI upset
(Take with food)

Anti-cholinergic effects-Drying of mucus membranes, Urinary hesitancy, constipation, palpitations

Promethazine (Respiratory depression and local tissue injury-IV site)
Paradoxical reaction in kids - sedative purposes, and now kids are wired- nervousness, insomnia, tremors
ex: Benadryl

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3
Q

Antihistamine- Drug Interactions

A
ETOH
Barbiturates
Benzodiazepines
Opioids
Sedatives
CNS depressants
Tricyclic antidepressants
MAO inhibitors
Ototoxic drugs

Space medication administration out to avoid interactions

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4
Q

What is histamine?

A
Locally acting compound
Effects vary by system
High levels in skin, lungs and GI tract
Low levels in plasma
Can be used in diagnostic procedures
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5
Q

What happens in response to histamine?

A
H1 receptors (Skin & lungs) 
Vasodilation (BP& Total peripheral resistance goes down)
Increased capillary permeability = edema
Bronchoconstriction
CNS effects
Itching
Secretion of mucus
H2 Receptors
Secretion of gastric acid- Histamine dominant over acetylcholine and gastrin
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6
Q

Pharmacologic Effects of Blocking H1 Receptors

A

Prevents vasodilation(mostly face & upper body) =reducing flushing
Decreased capillary permeability=reducing edema
Increased drowsiness
Decreased bronchoconstriction
Decreased itching and pain (blocks at a sensory receptors)
Decreased mucus secretion

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7
Q

Antihistamines MOA

A

Similar histamine antagonist 1 actions
First generation is more sedating ex: Benadryl
Second generation is much less sedating ex: Zyrtec, Claritin, Allegra
Selectively bind to H1-histamine receptors

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8
Q

Antihistamines- Contraindications/ Warnings

A

Pregnancy
Reports of fetal malformations
Benefits vs. risks
Avoid in 3rd trimester- newborns and infants are very sensitive to antihistamines
Lactation
Excreted in breast milk
Acute toxicity
Dilated pupils, flushed face, hyperpyrexia,
tachycardia, dry mouth, urinary retention
In kids CNS excitation
Can progress to coma, cardiovascular collapse and
death

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9
Q

Diphenhydramine

A

First generation antihistamine- Ethanolamines
Avoid as a sedative in children- Paradoxical excitation in kids
Can be very sedating
Use lower doses if possible
Not used freely as sedative for children
If used for insomnia, potential tolerance could be built up. If used for sleeping do so occasionally not regularly.
Technically not enough to treat insomnia therapeutically.
Caution with elderly

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10
Q

Fexofenadine

A
2nd generation anithistamine
Available OTC
pretty safe drug
Reduce doses in renal failure
Avoid fruit juices 4 hours before administration and 1-2 hours after
Good combination of efficacy and safety among 2nd generation drugs
Given to kids as young as 6 months
comes as liquid(helpful for kids)
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11
Q

Cetirizine

A

2nd generation anithistamine
Available OTC
Reduce doses in renal and hepatic impairment
Food delays absorption
More sedating than other 2nd generation antihistamines
may work best on empty, but if nauseous give with food

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12
Q

Levocetirizine

A

Available OTC
Contraindicated for children with any renal impairment
Reduce dose for mild to moderate renal impairment
More sedating than other 2nd generation antihistamines
Therefore, Take in the evening, so you won’t notice the effects as much.
given with food or not

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13
Q

Loratadine

A

2nd generation antihistamine (“big group”)
Available OTC
Food delays absorption
Dose every other day for significant renal or hepatic impairment
Extensive hepatic metabolism

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14
Q

Azelastine (Astelin, Astepro)

A

Intranasal 2nd generation antihistamine
Astelin is not approved for children under 12
Astepro is approved for children 5-11
Can cause drowsiness, nose bleeds, headaches and an unpleasant taste-all the things that happens with internasal spary

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15
Q

Antihistamines- Contraindications/ Warnings

A
Pregnancy
Reports of fetal malformations
Benefits vs. risks
Avoid in 3rd trimester
Lactation (AVOID)
Excreted in breast milk
Acute toxicity(d/c meds)
Dilated pupils, flushed face, hyperpyrexia, tachycardia, dry mouth, urinary retention
In kids CNS excitation
Can progress to coma, cardiovascular collapse and death
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16
Q

Asthma

A

Chronic inflammatory disease of the airway
Caused by immune-mediated inflammation of the airway
Treatment both inflammation and bronchoconstriction
Wheezing (sense of breathlessness), tightness of chest, dyspnea, cough

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17
Q

COPD

A

Smoking causes an inflammatory reaction
pt edu: smoking cessation-slowly decrease the daily amount of cigs
Maybe chronic bronchitis, emphysema, or both
Chronic bronchitis is from hypertrophy of mucus-secreting glands in the airway epithelium
Emphysema is an enlarged airspace between the bronchioles and alveoli due to the deterioration of the surrounding walls
Chronic, progressive and mostly irreversible
prevent from getting worse
Hypoxia, excessive sputum, wheezing, dyspnea, poor exercise tolerance, chronic cough

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18
Q

Asthma and COPD Drug Overview

A
Anti-Inflammatory Agents
     Glucocorticoids
       Usually inhaled
       Fixed schedule
       Used prophylactically- prevent inflamamtion
Bronchodilators
    Beta2 agonists
       Usually inhaled
       Fixed schedule used for long term control
       PRN used for acute attacks
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19
Q

Glucocorticoids: Therapeutic Uses

A

Most effective drug for long term control of airway inflammation
Suppress inflammation
Reduced bronchial hyperreactivity
Decreased airway mucus production
Decreased synthesis & release of Inflammatory mediators
Increased infiltration and activation of inflammation cells

Decreased edema in airway mucosa
Inhaled
First line therapy for asthma
Use daily with persistent/chronic asthma
More effective and safer

Oral
Moderate to severe persistent asthma
Management of acute exacerbations in asthma and COPD
Treatment should be as BRIEF as possible- otherwise use inhaled- less adverse effects

COPD-treat IV Steroids

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20
Q

Glucocorticoids: Adverse Effects In

A

Inhaled
Adrenal suppression- really large doses
Oropharyngeal candidiasis-rinse out mouth to prevent thrush
Dysphonia- damage to vocal chords
Growth suppression in children-May slow growth in children, but not height- pt ed: reassure parents still full height
Osteoporosis-Bone loss with long term use- give calcium
Glaucoma and cataracts with continuous use of high
doses- use lowest dose possible
and risk of lost airway greater than possible blindness
Oral
No significant adverse effects with doses less than 10
days
Adrenal suppression- not often but the most serious
Hyperglycemia- most often
Peptic ulcer disease

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21
Q

Glucocorticoids: Warnings/ Contraindications

A

Discontinue long term treatment slowly, not abruptly
Will not abort an acute asthma attack i.e. don’t use for acute asthma attacks
Inhaled is preferred to oral

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22
Q

Inhaled Glucocorticoid: Fluticasone Propionate

A

Flovent HFA is a MDI
Flovent diskus is a DPI
Administered on a fixed schedule
To prevent worsening pathophysiology and attacks

23
Q

Leukotriene Modifiers: Montelukast

A

Used for prophylaxis and maintenance of asthma, prevention of exercise induced bronchospasm and to treat allergic rhinitis
Blocks receptor activation by leukotrienes
Few drug interactions besides phenytoin
Generally well tolerated
2nd line therapy if glucocorticoids don’t work
adjunct therapy
Adv effects: Suicidal thinking and suicidal thoughts- screen pts.
safe for kids as old as one

24
Q

Bronchodilators

A

Symptomatic relief of asthma and COPD
Do not alter the underlying inflammation
Usually adjunct therapy
Monotherapy in mild asthma with infrequent attacks
Includes Beta2-adrenergic agonists, methylxanthines and anticholinergic drugs
used in acute attacks

25
Short Acting Beta2 Agonist (SABA)
``` • Use o Abort asthma attack o Prevention of exercise induced bronchospasm (EIB) -Can be used in long term control, but taken frequently Inc frequency of drug intake in # of attacks go up -Short half-life • Route o Nebulized if severe attack o MDI o DPI • Adverse Effects o Tachycardia, angina, tremor • Contraindications/ Warnings o Step up therapy if using > 2x/week o Avoid in stable COPD (use LABA) ```
26
Long Acting Beta 2 Agonist (LABA)
Use o Long term control in patients who have frequent asthma attacks, must be combination therapy in asthma o Stable COPD - ALL COPD -long acting=long half-life=long-term control -long half-life so you'll take them less frequently • Route o Inhalation o PO • Adverse Effects o Inhaled: increased risk of death in asthma if monotherapy o PO: angina, tachydysrhythmias, tremor • Contraindications/ Warnings o Can’t stop an acute attack o Avoid as monotherapy
27
Albuterol
PO beta2-adrenergic agonist Can cause tremors, insomnia, and tachycardia- Watch HR Can be used for long or short term control Dosing may be 3-4 times daily Often inhaled, but can be PO Selective for beta2 in recommended doses- nebulizers
28
Levalbuterol
``` Inhaled SABA Usually a MDI/nebulizer PRN for acute attacks Take before exercise to prevent exercise induced bronchospasm (EIB) short-acting drug ```
29
Salmeterol
Inhaled LABA Fixed schedule Use with glucocorticoid, in same inhaler if possible (ideally) May need to increase frequency of dosing with continued use Frequently combined with fluticasone
30
Methylxanthines: Theophylline
Cause CNS excitation, bronchodilation Used to prevent asthma attacks at night and stable asthma COPD: use beta2-adrenergic agonists and glucocorticoids first Check drug levels, LFTs Interacts with caffeine, tobacco and marijuana smoke
31
Salmeterol
Inhaled LABA Fixed schedule Use with glucocorticoid, in same inhaler if possible May need to increase frequency of dosing with continued use Frequently combined with fluticasone
32
Methylxanthines: Theophylline
Cause CNS excitation, bronchodilation Used to prevent asthma attacks at night and stable asthma COPD: use beta2-adrenergic agonists and glucocorticoids first Check drug levels, LFTs Interacts with caffeine, tobacco and marijuana smoke
33
Anticholinergics: Ipratropium
Improve lung function by blocking muscarinic receptors in the bronchi, leading to bronchoconstriction FDA approval for COPD, but used off-label for asthma Inhaled, so minimal systemic effects Adverse effects are dry mouth, pharynx irritation
34
Treatment Goals in Asthma
Reducing impairment Preventing chronic and troublesome symptoms Reducing use of SABAs for symptom relief to 2 or less days/ week Maintaining as normal of lung function as is possible Maintaining normal activity levels Meeting patient and family expectations regarding asthma care Reducing risk Preventing recurrent exacerbations Minimizing need for ER visits or hospitalizations Preventing progressive loss of lung function Providing maximum benefits with minimum adverse effects
35
Treatment Goals in COPD
Improve the patient’s health status and exercise tolerance | Reduce risks and mortality by preventing progression of COPD and preventing and managing exacerbations
36
Phenylephrine
``` Sympathomimetics Available nasally and PO Fast and effective when used topically Not as effective when used PO Not associated with abuse Used IV to treat hypotension ```
37
Expectorants: Guaifenesin
Stimulates respiratory secretions, making coughs more productive May need higher than recommended doses to be effective Often combined with dextromethorphan
38
Other Medications for Allergic Rhinitis
``` Antihistamine/sympathomimetic combos Antihistamine/glucocorticoid combos Ipratropium Montelukast Omalizumab ```
39
Antitussives
``` Opioids Dextromethorphan Other Non-opioids Most effective Abuse potential is low Most effective OTC Diphenhydramine Benzonatate ```
40
Cold remedies: combination preparations
``` Treat symptoms Usually a combination of: Nasal decongestant Antitussive Analgesic Antihistamine Caffeine ```
41
Cold remedies in children
No proof of efficacy or safety in children Known potential for harm (including death) FDA does not recommend OTC cold remedies in children under 2 years FDA is reviewing the safety of these drugs in children 2-11 years American Academy of Pediatrics recommends avoiding until 6 years Measure carefully and accurately Do not use to sedate children
42
Ephedrine
``` Sympathomimetics Only administered PO Higher incidence of CNS stimulation Can be converted to methamphetamine Restrictions of amount purchased More effective than phenylephrine ```
43
Pseudoephedrine
``` Sympathomimetics Only administered PO Cns stimulation is lower Can be converted to methamphetamine Restrictions of amount purchased More effective than phenylephrine ```
44
Epinephrine
is drug of choice for severe allergies not an antihistamine in emergency you can give Benadryl if epi not available
45
Inhalation Drug Therapy
``` Advantages Enhanced therapeutic effects Fewer systemic effects- b/c it's contained within the lungs Rapid relief of acute attacks Types Metered-dose inhalers (MDIs) Respimats Dry-powder inhalers (DPIs) Nebulizers ```
46
MDI
metered dose w/ each activation or inhalation | problem: the entire dose isn't absorbed.
47
Spacers
reduces the need for the hand-breath coordination | reduced bronchospasm that occurs with sudden intake of inhaled drugs
48
Respimats
fine mist activated by no propellent most of the drug reaches site b/c particles are so small BUT not all drugs come like this
49
DPIs
Dry Powder Inhalers; breath activated = no hand-breath coordination needed. 20% makes it the lungs which is a fair amount
50
First and Second Generation Antihistamines
``` First Generation 5 major categories Alkylamines Ethanolamines-Diphenhydramine Phenothiazines Piperazines piperidines ``` ``` Second Generation 5 PO drugs Cetirizine- Zyertec Fexofenadine** - Allegra Loratadine- Claritin Levocetirizine- Xyzal Desloratadine- prescription - not often used ``` 2 intranasal drugs Azelastine - Astelin/Astepro Olopatadine
51
First and Second Generation Antihistamines differences
``` 1st gen Sedation is common Significant anticholinergic properties Generally less expensive 2nd gen Less sedating Fewer anticholinergic effects Usually more expensive ```
52
EBP: General Tips for Physical Activity and Exercise for Asthma Patients
Take all you medications as prescribed Ask about medications for before you exercise Have you rescue medication handy Perform a 15 minute warm-up and cool-down Postpone exercise if symptoms are not well controlled or you have a cold or respiratory infection Check the air quality index- stay inside if pollution or allergen levels are high Breathe through the nose as much as possible When outdoors, avoid areas with a lot of allergens or irritants When indoors, keep windows and doors closed to reduce allergen exposure Promoting physical activity and exercise in patients with asthma and chronic obstructive pulmonary disease.
53
EBP: Asthma in Pregnancy
Asthma is the most chronic condition seen in pregnancy Pregnant asthmatics have increased risk of preterm birth, intrauterine growth restriction, pregnancy-induced hypertension, preeclampsia. Their babies have an increased risk of congenital malformations of nervous, respiratory and digestive systems at birth and respiratory disease later These women need to continue to take their asthma medications and should work to control symptoms The pregnant patient with asthma: Assessment and management.