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busdriverre
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What do adrenergic agonsists do:
- stimulate sympathetic nervous system
- increase cardiac output
- raise blood pressure
- increase uring output
- constrict blood vessels
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Catecholamine info
- can not be oral
- don't cross blood brain barrier
- have short action
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3 main adrenergic agonists and what used for
- Epinephrine for AV blocks, cardiac arrest & asthma
- Dopamine for shock and heart failure
- Dobutamine for heart failure
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Interactions for adrenergic agonists
- avoid using MAOI's
- avoid tricyclic depressants
- with general anesthesia the heart becomes hypersensitive to epinephrine causing dysrhythmias
- alpha adrenergic blockers - blocks receptors
- beta blockers - block beta receptors
- diuretics - promote beneficial effect of dopamine - monitor for therapeutic effects
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Epinephrine uses
- vasoconstriction
- slows absorption of local anesthetics
- manages superficial bleeding
- decrease nasal congestion
- increse blood pressure
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Epinephrine beta 1 actions
- increase heart rate
- increase myocardial contractility
- increase rate of conduction through AV node
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Epinephrine beta 2 actions
bronchodilation
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Epinephrine adverse effects & nursing actions
- can lead to hypertension - monitor heart rate & vitals
- can cause dysrhythmias - monitor for dysrhythmias
- increased heart rate can increase workload of heart and increase need for oxygen - monitor for chest pain
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Dopamine dosing - low dose effects
dilation of renal blood vessels
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Dopamine dosing - moderate dose
- dilation of renal blood vessels
- increase heart reat
- increased myocardial contractility
- increased AV node conduction rate
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Dopamine dosing - high dose
- dilation of renal blood vessels
- increased heart rate
- increased myocardial contractility
- increased AV node conduction rate
- vasoconstriction
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Dopamine side effects & nursing actions
- dysrhythmias \\\\\\\\\\\
- increased heart workload-------- monitor heart rate, pain, dysrhythmias
- increased oxygen need ///////////
- necrosis from extravasation from high doses ---- monitor IV site
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Dobutamine effects
- only affects beta 1 receptors
- increased heart rate
- increased myocardial contractility
- increased AV node conduction
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