Block I: HTN Flashcards
How is BP determined?
CO X PR
where CO= HR xSV
where SV= EDV-ESV
[] is resistance/friction that arterioles have against the flow of blood
peripheral resistance
what can increase PR?
- vasoconstriction
2. athersclerosis
what can decrease PR?
vasodilation
vasoconstriction has [] affect on PR and [] effect on BP
increases PR, increases BP
vasodilation has [] affect on PR and [] effect on BP
decrease, decrease
atherosclerosis has [] affect on PR and [] affect on BP
increase, increase
[] is the amount of blood that is pumped out of the heart per minute
cardiac output (normal 5L in avg. adult)
how is CO determined?
HR X SV
SV=EDV-ESV
what 4 factors affect HR
- autonomic innervation
- hormones
- fitness level
- age
what factors affect stroke volume
- heart size
- fitness level
- gender
- contractility
- duration contraction
- pre-load (EDV)
- afterlaod resistance (ESV)
[] is the volume of blood in ventricles at end of diastole
EDV
[] is resistance left than the ventricle must overcome to circulate blood
ESV
stimulation of [] will cause all factors of BP to rise
SNS
SNS stimulation of BP will cause all factors to []
rise
what causes SNS stimulation on heart
- stress
- exercise
- pheochromocytoma
[] is failure of heart to adequately pump enough blood to meet body’s needs
chronic HF
what are some compensatory mechanisms of heart failure?
- hypertrophy of cardiac muscle & chamber size
- neurohumoral reflex (activate SNS)
- kidneys & RAAS
describe the goal of hypertrophy to compensate during HF
an attempt to increase stroke volume
describe the goal of neuralhumoral reflexes in HF
activate sympathetic nervous system
alpha 1 -> vasoconstrict
beta 1 -> increase HR and force myocardial contraction
what happens when SNS activates alpha-1 receptors
vasoconstriction
what happens when SNS stimulates beta-1 receptors
increase HR and force myocardial contraction
positive inotropic and choriotropic respectively
describe the role of kidneys in HF
will activate RAAS –> vasoconstriction and release aldosterone –> increase Na and water retention
increase BP and blood volume
what needs to be reduced to control heart failure?
cardiac work load
- HR
- SV (EDV-ESV)
- PR
what drugs interfere with RAAS?
- ACEI
- ARBS
- Renin inhibitors
what drug class do the “prils” belong to?
ACEI
what is the moa of the “prils”
ACEI (angiotensin converting enzyme inhibitor)
block angiotensin 1 from being converted to angiotensin 2
-thereby decreasing vasoconstriction and aldosterone release (inhib. Na and water retention)
what are some indications for ACEI?
- HTN
- HF
- post MI
(also CKD)
what suffix belongs to ARBs?
“artans”
what is the MOA of the “artan” drugs
angiotensin receptor blocker
block angiotensin 2 from binding target cell and exerting effect
indications ARB
- HTN
- HF
- post MI
(helpful in CKD)
describe some AE affects of ACEI/ARB
- cough (due to bradykinin)
2. angioedema (more common in black individuals)
ACEI [>/
ACEI
what are some drugs that affect the SNS to help with HTN
- centrally acting sympatholytic
- neuronal blockers
- alpha blockers
- beta blockers
what is the role of alpha-1 receptors when stimulated by SNS
contraction of smooth muscle via NE
what is the role of beta-1 receptors when stimulated by SNS
cardiac stimulation via NE (increase force & rate contraction)
[] is the name of a centrally acting symatholytic
Clonidine
what is the MOA clonidine
centrally acting sympatholytic
acts on vasomotor centers of medulla oblongata & stimulates inhibitory receptors to reduce activity of sympathetic nerves that control HR and CO (thereby decreasing BP)
what are some other uses for clonidine?
centrally acting sympatholytic
- AHDH off label
- drug WD
- menopausal flushing
- diarrhea
Guanthidine is a []
neuronal blocker
what drug is a neuronal blocker?
Guanthidine
what drug is a centrally acting sympatholytic?
conidine
MOA Guanthidine
Neuronal blockers
causes significant inhibition of sympathetic activity
reserved for HTN that doesn’t respond to other drugs
what type of drugs are the ‘zosins’
alpha blockers
what suffix belongs to alpha blockers
zosins
what is the moa of alpha-1 blockers
normally alpha-1
- produces contraction and vasoconstriction when stimulated by NE
- increases PR
- increases BP
blockers reverse these effects
where are alpha-1 receptors located
smooth muscle of arteries, veins, sphincters & urinary tract
where are alpha-2 receptors located
what is their role?
adrenergic nerve endings, activated NE and EPI
negative feedback mechanism, regulates release of additional NE
- inhibits ACH release
- inhibits insulin release
- would want to agonize to treat HTN
what is the MOA of the zosins
alpha-1 blocker
block alpha-1 stimulation from NE, thereby blocking vasoconstriction and reducing PR
what drug class do the “olols” belong to
beta blockers
beta [] receptors are the predominant heart receptors
1
what is the role of beta-1 receptors
predominant heart
- increase myocardial contractility
- increase HR
- increase renin release
- cause tachycardia
*antagonize to treat heart issues
what is the role of beta-2 receptors
primarily in lung
- cause bronchodilation
- vasodilation (decreased PR)
- relaxed uterine smooth muscle
*caution use non selective BB in asthmatic and COPD patients
where are beta-2 receptors most predominately
smooth muscle and tissue
MOA ‘olols’
beta blockers
-inhibit sustained NE activation from SNS (inhibit cardiac stimlation)
indication beta blockers
- chronic heart failure (carvedilol, b-olol, metoprolol succ)
- reduced LV systolic function (L sided heart failure)
AE BB
- exacerbate symptoms in acute decompensated HF
- WD symptoms (ischemic)
- may affect glucose levels and mask effect hypoglycemia
orthostatic hypotension is a risk in [] drug
alpha inhibitor
[] should NOT be used in decompenstated HF
BB
[] can mask the symptoms of hypoglycemia
BB
[] may cause ischemic WD symptoms
BB
what is a relative contraiction in BB
COPD/Asthma in non-selective BBs
-if b-2 stimulation is blocked it may cause bronchoconstriction
hydralazine is [] type of drug
arterial vasodilation
minoxidil is [] drug
arterial vasodilator
MOA hydralazine
decrease sympathetic done, cause vasodilation
ARTERIAL
MOA minoxidil
decrease sympathetic tone, cause vasodilation
ARTERIAL
what kind of drug is nitroglycerin
vasodilator of veins and arteries
what kind of drug is nitroprusside
venous & arterial dilator
[] are often used on comnimation with diuretics and BB due to fluid retention and reflex tachycardia
vasodilators (hydralazine, minoxidil, nitroglycerin, nitroprusside)
[] is indicated FOR acute decompensated HF
vasodilators (hydralazine, minoxodil, nitroglycerin, nitroprusside)
[] is NOT indicated for decompensated HF
BB
[] is indicated for
- HTN
- post mi
- decompnensated HF
vasodilators
hydralazine, minoxodil, nitroglycerin, nitroprusside
MOA CCB
bind to long acting calcium channels to block influx of calcium in cardiac smooth muscle
- block depolarization
- block AP
nifedipine, amlodipine, and nicardipine belong to [] class
dihydropyridine CCBs
MOA of the dipines
dihydropyridine CCB
arterial dilation, decreased HR, decreased AV conduction & decreased myocardial contractility
due to blocking of long acting calcium channels
indications for dipine drugs
- HTN
- CAD
- angina
- cardiac arrythmias (diff from nonDHP)
what is the drug class verapamil
non DHP CCB
what is the drug class of diltiazem
non DHP CCB
what is the caution of non DHP
bradycardia
what is the MOA diltiazem
non DHP CCB
atrial dilation
what is the MOA verapamil
non DHP CCB
eterial dilation
indiations for non DHP CCB
- HTN
- CAD
- angina
(DHPs inddicatied for arrythmias, but non DHPs NOT indicated)
AE of CCB (CV)
- hypotension
- palpitations
- bradycardia
- peripheral edema
GI AE CCB
constipation
how can diuretics be helpful in treating HTN
increase excretion of water and salt from body (reverse effects adolosterone)
indications diuretcis
- edema
- HTN
- HF
[] is the most common cause of cardiovascular disease
HTN
stimulation of alpha-1 receptors leads to []
vasoconstrictoin (antagonize to treat HTN)
stimulation alpha-2 receptors leads to []
inhibit NE release (block sympathetic stimulation and vasoconstriction)
- negative feedback mechanism
- would want to agonize to treat HTN
beta-1 receptor activation leads to []
increased HR and contractility, increased renin
want to antagonize for HTN
beta-2 receptors activation leads to []
smooth muscle relaxation, can cause bronchodilation
blocking Beta-2 can lead to bronchoconstrction, caution COPD and asthma
[] is the most influential contributor to homeostatic regulation of BP
RAAS