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HTN Drugs
Pharmacology
47
Medical
Professional
11/19/2011

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Term
This is the hallmark feature of essential hypertension
Definition
Increased TPR
Term
what are the resistance vessels
Definition
arteries and arterioles
Term
Capacitance vessels
Definition
venules (determine CO)
Term
Stage 1 HTN drug choices
Definition
THIAZIDE diuretics initially
ACE, ARB, BB, CCB
Term
HCTZ mech of action
Definition
blocks Na reabsorption in kidney

Needs to be combined with another HTN drug.
Term
Prototype ACE Inhibitors
Definition
Enalapril, Fosinopril, Captopril
Term
Mech of Action for ACE inhibs
Definition
inhibits ACE which converts Ang I to ang II
Term
Clinical use of ACE inhibs
Definition
used alone or comb w/diuretic
Term
Toxicity of ACE inhibs
Definition
COUGH
hyperkalemia
angioedema
*increased renin*
NO to Pregant women!
Term
Prototype ARB's
Definition
Losartan
Term
Mech of action for ARBs
Definition
bind receptors on sm. muscle, block Ang II from causing vasoconstriction
Term
Toxicity of ARBs
Definition
NO COUGH
Term
renin inhibitor
Definition
Aliskiren
Term
Mech of action for aliskiren
Definition
blocks angiotensinogen to ang I

*rate limiting step in formation of angII*
Term
Clinical use of renin inhib
Definition
avoids rise in plasma renin activity
(renin thought to be involved in mortality0
Term
HTN drug in pregnant women
Definition
Hydralazine + B-blocker
Term
where is the a1 receptor located
Definition
vascular smooth muscle (constriction)
Term
Effect of a2
Definition
CNS: inhibit NE to DECREASE sympathetic tone
Term
B1 rec
Definition
In heart- incr rate, contractility, and CO
Term
B2 effect
Definition
vascular sm. muscle (dilation)
Term
What are the centrally acting sympatholytics
Definition
Clonidine, methyldopa, reserpine
Term
What are central acting used for
Definition
severe, resistant HTN.
Term
Toxicities of Central acting
Definition
CNS toxicity
dry mouth, stuffy nose
Methyldopa- *positive Coomb's test*
Clonidine- *severe rebound HTN*
Term
Peripheral acting sympatholytic
Definition
guanethidine
Term
Guanethidine mech of action
Definition
No CNS effects
depletes catecholamine displacing them in peripheral nerve endings
Term
Toxicity of Guanethidine
Definition
severe sympatholysis
profound hypotension, shock
Term
A1 blockers
Definition
Prazocin -ocin
Term
A1 antag mech of action
Definition
Blocks a1 on vascular sm. muscle blocking constriction caused by NE release.
Term
A1 antag toxicity
Definition
1st dose orthostatic hypotension and tachy
Term
Mech of Beta blockers
Definition
reduce HR and contr.
reduce renin release, decr Ang II
Term
Combination therapy of Beta blocker
Definition
diuretic- uncomplicated HTN

also prevent reflex tachycardia
Term
Toxicity of B blocker
Definition
AV heart block
propanolol- bronchospasm
Term
This I.V. is available for HTN crisis, although not first line
Definition
Hydralazine
Term
This direct vasodilator increases cGMP to cause smooth muscle relaxation
Definition
Hydralazine
Term
toxicity of Hydralazine
Definition
lupus like syndrome of myalgia, arthalgia, and skin rashes
Term
Mech of action for Diazoxide
Definition
Activates K channels, hyperpolarizing vasc sm. muscle causing dilation
Term
Clinical use of Diazoxide
Definition
Severe HTN emergencies
Term
Toxicity of Diazoxide
Definition
reflex tachycardia used alone
volume retention
Term
This direct vasodilator induces hyperglycemia
Definition
diazoxide
Term
This is a dopamine 1 agonist IV used for hypertensive ER
Definition
Fenoldapam
Term
Three classes of CCBs
Definition
Verapimil
Diltiazem
Nifedipine and Amlodipine
Term
mech of action for CCBs
Definition
block L-type Ca channels affecting heart contraction and VSM
Term
Preference of CCBs in heart
Definition
verapimil, diltiazem, nifedipine
Term
preference of CCB in the vessels
Definition
Nifedipine, diltiazem, verapimil
Term
clinical use of CCB's
Definition
Raynauds dz
Suprventricular arrhythmia
Term
Toxicity of Sodium Nitroprsside
Definition
thiocyanate toxicity
Term
side effect of Fenoldapam
Definition
increase in intraocular pressure
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