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34 Cards in this Set
- Front
- Back
Primary controllers of vascular tone used to primarily lower blood pressure
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Alpha blockers
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Name three alpha 1 selective agents commonly used in treatment of hypertension
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PRAZOSIN
DOXAZOSIN TERAZOSIN |
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Little impact on the heart but they have selective effects which are evident in their side effect profiles
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Alpha blockers
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Side effects of alpha blockers
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- Postural hypotension with reflex tachycardia (most common)
- Nasal congestion and headache - Rebound hypertension if stopped abruptly |
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Name two non-selective alpha blockers that can be used in the diagnosis and treatment of the symptoms of pheochromocytoma
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PHENOXYBENZAMINE
PHENTOLAMINE |
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Name three subgroups of beta blockers
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- Nonselective beta blockers (beta1 and beta 2) - PROPRANOLOL, timolol, nadolol
- Beta 1 selective agents - METOPROLOL, atenolol,esmolol acebutolol, - Beta 2 selective agents |
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Cardiac uses of beta blockers (most common)
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- HYPERTENSION
- UNSTABLE ANGINA - Prophylaxis after MI |
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Less common uses (nonn-cardiac) of beta blockers
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- Symptomatic treatment of hyperthyroidism
- Prophylaxis against migraine headaches - Anxiety disorder |
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Which beta blockers have negative inotropic and chronotropic effects - slowing of SA and AV nodes
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Beta 1
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Which beta blockers work by decreasing cardiac output
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Beta 1
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Beta 2 blockers are contraindicated in patients with _
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COPD
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Which beta blockers work by constriction of airway smooth muscles
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Beta 2
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Endocrine effects of beta blockers
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Decreased glycogenolysis
Decreased glucagon release |
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Can diabetic patients take beta blockers
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Should be used with caution in patients with diabetes who take insulin and are at risk for hypoglycemia
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Ocular effects of beta blockers
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Decreased aqueous humor production by processes of ciliary body
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Name beta blocker that can be used topically for glaucoma
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Timolol
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Adverse effects of beta blockers
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- Sexual dysfunction in males
- Arrythmias if drug is stopped abruptly - Bronchoconstriction - Blocking hypoglycemic response in diabetics |
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Second line anti hypertensive agents
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Ca channel blockers
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Mechanism of action of ca channel blockers
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Binding to L type Ca channel of vascular smooth muscle cells and myocytes, block entry of Ca into those cells
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These agents affect both vascular tone and the heart itself - effects on the heart include negative inotropy and slowing of the conduction system
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Ca channel blockers
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Name two classes of Ca channel blockers
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Dihydropyridines
Nondihydropyridines |
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Which Ca channel blockers have greater effect on vascular smooth muscle than on the heart - give examples
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Dihydropyridines - NIFEDIPINE, AMLODIPINE
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Which Ca channel blockers have increasingly greate effects on the myocardium
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Nondihydropyridines - DILTIAZEM, VERAPAMIL
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Adverse effects of Ca channel blockers
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HYPOTENSION
Headache CONSTIPATION Exacerbation of GERD |
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Along with alpha-methyldopa, a centrally acring antihypertensive drug, acts as AGONIST AT PRESYNAPTIC ALPHA 2 RECEPTORS, decreasing central sympathetic tone
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Clonidine
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Adverse effects of clonidine
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Sedation and REBOUND HYPERTENSION if drug is stopped abruptly
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Giving IV this agent is the drug of choice for HYPERTENSIVE EMERGENCIES
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Sodium nitroprusside
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This drug should always be given IV, given orally this drug is toxic because it results in cyanide production, affects both arterial and venous smooth muscle
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Sodium nitroprusside
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These agents are not first line agents for hypertension, often used with beta blockers and diuretics, REFLEX TACHYCARDIA that results can actually precipitate attacks of angina
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Vasodilators (HYDRALAZINE, MINOXIDIL)
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Adverse effects to hydralazine
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Headache, arrhythmias and LUPUS-LIKE REACTION
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Adverse effects of MINOXIDIL
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Sodium retention and hypertrichosis
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This Ca channel blocker can be used to control the ventricular response rate in atrial fibrillation because it slows AV nodal conduction
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Diltiazem
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These antihypertensive agents can also be used to treat symptoms of BPH
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Alpha 1 blockers
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These antihypertensive agents can mask many of the symptoms of hypoglycemia ( tremors, sweating, palpitations) mediated by epinephrine. This as well as endocrine effects puts individuals taking them with insulin dependent diabetes at increased risk of profound hypoglycemia
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Beta blockers
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