Respiratory/HEENT Flashcards
Class of Albuterol (ProAir) is ____
SABA - selective short-acting beta-2 receptor agonist (some minor beta 1 activity)
Albuterol (SABAs) : Pharmacodynamics
- acts on beta 2 receptors of intracellular adenyl cyclase (thus increase cAMP conversation) in the lungs – increasing vital capacity and airflow –> Act on the smooth muscle of the bronchi to reverse bronchospasm and inhibit the release of hypersensitivity mediators from mast cell degranulation
- some effect on beta 1 receptors in the hear –> SE: tachycardia, nervousness, etc.
Albuterol : cautions/contraindications
-
avoid in arrhythmias that cause tachycardia or heart blocks and pheochromocytoma (adrenal tumor- increased sympathetic response)
- with pheochromocytoma –> severe HTN
-
caution in pts with CV disease (CHF, HTN), diabetes, glaucoma, and hyperthyroidism
- may need to increase insulin dose in DM (d/t drug-induced hyperglycemia)
- can decrease digoxin serum level
Albuterol/SABA ADRs (usually transient)
tachycardia, dizziness, palpitations, tremors, nervousness, headache -
** due to effect on beta 1 receptors in the heart**
Examples of other SABAs
- terbutaline (Brethine, Brethaire)
- metaproterenol (Alupent)
- pirbuterol (Maxair)
- levalbuterol (Xopenex)
Three drug classes used for asthma
- SABA - short-acting Beta 2 receptor agonists
- LABA - long-acting Beta 2 receptor agonists **not as monotherapy in asthma**
- ICS - inhaled corticosteroids (take bronchodilator before ICS)
Salmeterol (Serevent) [LABA] MOA
- relaxes bronchial smooth muscle by selective action on beta 2 receptors
3 advantanges:
- Quick onset of action
- Long MOA- last longer
- More selective to Beta-2 receptors which decreases the prevalence of side effects
Other examples of LABA medications
- formoterol (Foradil) Q12h
- vilanterol (Breo Ellipta)
- Ultra long-acting
- taken QD“Very easy to take”
LABA : cautions/contraindications
- NOT to be used as mono-therapy in patients with asthma (Serevent and Foradil)
- causes downregulation of beta-2 receptors if used alone so in emergencies, short-acting beta-2 receptor antagonist medications (Albuterol) will not work –> leads to an increase in asthma-related death
- caution in pts with CVD, diabetes, hyperthyroidism, glaucoma
What drug class contains Theophylline?
Xanthine dervatives
Theophylline/Xanthine derivatives MOA
- general bronchodilator –> inhibit PDE –> increase cAMP –> leads to relaxation of smooth muscle and pulmonary vessel relaxation
- sympathomimetic-–works on the sympathetic nervous system: CNS stim., CV effects, increased fight/flight
- has a similar chemical structure to caffeine
Theophylline/Xanthine derivatives: cautions/ contraindications
- monitor closely in cardiovascular disease
- avoid in pts w/ hx of seizures, peptic ulcer dz
- educate patient to avoid smoking and caffeine
- educate pt on the signs of toxicity
- educate pt to maintain a steady diet
Ipratropium bromide (Atrovent) / SAMA MOA
-selectively blocks M3 receptors in the lungs causing bronchodilation
- muscarinic receptor antagonist/anticholinergic gent
-a bronchodilator
SAMA “-tropium”: indications and MOA
Mostly used for COPD - prevent bronchoconstriction
- may be used in asthma exacerbation with albuterol (DuoNeb)
- selectively block the muscarinic 3 receptors in the bronchial smooth muscle causing bronchodilation
- also have anticholinergic effects because muscarinic receptors are cholinergic receptors
- (drying, confusion in elders, dry eyes, urinary retention)
Ipratropium bromide (Atrovent) = Immediate effects
Atrovent/Ipratropium bromide cautions/ contraindications
- not used alone for acute bronchospasm
- due to anticholinergic effects:
- avoid in pts with urinary retention, BPH, and closed-angle glaucoma
(Anticholinergic effects: patients can’t see, pee, spit, shit, or think)
Ipotropium [Atrovent]/ SAMA : ADR
cough, dry mouth, mouth and throat irritation, dyspepsia, n/v
Atrovent/SAMA patient education
- after use, rinse mouth and spit it out
Tiotropium bromide (Spiriva) Indications for use and MOA - LAMAs
Used primarily for COPD to control symptoms
Selectively block the muscarinic 3 receptors (muscarinic 3 receptor antagonist) in the lungs leading to smooth muscle bronchodilation
- long-acting anticholinergic/muscarinic antagonist agent
Tiotropium bromide (Spiriva) cautions/ contraindications
- due to anticholinergic effects: avoid in pts with urinary retention, BPH, and closed-angle glaucoma
LAMA Adverse Drug Reactions
- dry mouth, pharyngitis, upper respiratory infection, headache, mouth irritation
- not approved for children < 12 years old
LAMA patient education
- Rinse mouth after inhaling medication
Leukotriene Modifiers Indication and Examples
- Allergies/allergic rhinitis with asthma OR if pt is not well controlled during times when seasonal allergies are worse
Montelukast (Singular)
Zafirlukast (Accolate)
Zileuton (Zyflo)
Montelukast and Zafirlukast MOA
Leukotriene receptor antagonist (LTRAs) - blocks the cysteinyl leukotriene (CysLT1) receptor and decreases the inflammatory response in the lungs (no mast cell degranulation)
Leukotriene Modifiers cautions/contraindications
- Zafirlukast and Zileuton- use with caution in patients with hepatic disease
- Not to be used in acute asthma exacerbation