Chapter 39 Flashcards
Functions of the Respiratory System
Gas exchange Delivery of oxygen to tissues through Kreb cycle Remove wastes Acid-base balance Protection
Respiratory pH range
7.34-7.45
Respiratory diffusion
O2 & CO2 between alveoli & pulmonary capillaries
Respiratory perfusion
O2 & CO2 between capillaries & body cells
bronchodilators stimulate?
beta2- adrenergic receptors
Sympathetic nervous system stimulation causes?
Bronchodilation
Increased rate & depth of respirations
Parasympathetic nervous stimulation causes?
Bronchconstriction
Decreases rate & depth of respirations
Aerosol Therapy effects
Immediate relief of bronchospasm
Loosens thick mucus
Disadvantages of Aerosol Therapy
Difficult to measure dose (only 10–50% of drug is placed)
side effects occur if client swallows drug
bitter taste
must rinse mouth
Small volume nebulizer (SVN)
Aerosol
Vaporizes liquid drug into fine mist
Uses small machine and face mask
Asthma
inflammation and constriction of airway
Status Asthmaticus
acute attack with severe bronchospasm
does not respond well to bronchodilator therapy
Rescue medication types
Short acting beta2-agonists
Anticholingerics
Controller medication types
Inhaled corticosteroids
Long acting beta2-agonists
Leukotriene modifiers
Mast cell stabilizers
Bronchodilators
Beta agonists
Albuterol (Proventil)
Salmeterol (Serevent)
Salmeterol + Fluticasone (Advair)
Bronchodilator mechanism of action
stimulates sympathetic receptors in bronchial smooth muscle to cause bronchodilation
Beta2-Adrenergic Agonists
Sympathomimetics
Most effective drugs for relieving acute bronchoconstriction
Beta2-Adrenergic Agonists action
activate beta2-receptors in bronchial smooth muscle to cause bronchodilation
Beta2-Adrenergic Agonist route
inhalation
orally
Beta2-Adrenergic Agonist oral therapy
Longer duration of action than oral
can cause systemic effects of tachycardia, dysrhythmias, hyperglycemia(because of steroid component)
Beta2-Adrenergic Agonist long term use
decreased duration of action
leads to increased dose or addition of glucocorticoid
beta 2 receptors may decrease as you age
salmeterol (Serevent) category
Beta2-Adrenergic Agonists
salmeterol (Serevent) mechanism of action
selectively binds to beta2-receptors in bronchial smooth muscle
causes bronchodilation
salmeterol (Serevent) use
prevention of exercise-induced bronchospasm
not for acute rescue, given hours before exercise
salmeterol (Serevent) adverse effects
headaches, throat irritation nervousness, restlessness, tachycardia, dry mouth
Anticholinergics action
block parasympathetic nervous system causing bronchodilator effect
possible alternative to beta agonists
Ipratropium (Atrovent) category
Anticholinergic
Ipratropium (Atrovent)
slower and less effective than beta 2 agonists
most effective when combined with beta 2 agonist or glucocorticoid
Tiotropium (Spiriva) category
Anticholinergic
Tiotropium (Spiriva) adverse effects
dry mouth, GI distress, HA, anxiety, rare systemic
Anticholinergic contraindications
narrow-angle glaucoma, benign prostatic hyperplasia, renal disorders, urinary bladder neck obstruction
do not give under 12 years old
Albuterol (Proventil) length of action
short
Salmeterol (Serevent) length of action
moderate
Salmeterol + Fluticasone (Advair) length of action
moderate plus steroid for long action
Beta2-Adrenergic Agonist contraindications
soy or peanut allergy