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
effects of RAAS
- regulate NA (aldosterone causes Na and water retentaion, K wasting)
- blood volume (increases due to aldosterone)
- SNS activity & vascular tone (increase BP HR CO)
how is RAAS stimulated?
- decreases perfusion kidneys
- decreased Na and Cl delivered to distal tubule
(activate need to alsodterone to absorb NA) - direct stimulation beta-1 receptors (release renin)
what receptors release renin?
beta-1
what are 2nd causes HTN
- renovascualr dx
- pheochromocytoma
- primary aldosteronism
- cushing’s
- coarctation of aorta
- sleep apnea
- head injury
- brain tumor
medications to cause HTN
- corticosteroids
- NSAIDS
- Na/water retention SE
- estrogen
what are ways SNS Can be activated, what effect does this have on BP
can cause HTN
- amphetamines
- sympathomimetic agents
- antidepressants (SNRI< Trycyclics
st. john’s wort can [] BP
increase
alcohol can [] BP
increase
according to ACC/AHA guidelines, what is HTN
> 130/80
according to JNCP guidelines what is HTN
> 140/90
what is ACC/AHA stage 1 HTN
130-39/80-89
what is ACC/AHA Stage 2 HTN
> /= 140/90
what is the BP threshold for everyone EXCEPT a 1o year ASCVD risk < 10% and stable ischemic heart disease
> /=130/80
what is the BP threshold for a patient a ASCVD risk of < 10%
> /= 140/90
what is a BP threshold of a patient with stable ischemic heart disease
> /= 140/90
normal BP patients should be followed up how requently
annual
patients with hx HTN but are at goal/nonpharm
how frequently should they fu
1-6 months
medication change, when to see pt back?
1 month
1 Kg weight reduction can result in [] BP change
1 mmHG for every 1 KG
general counseling points DASH
increase fruits, veggies, whole grains, low fat
-decrease saturated adn total fat
what is Na intake goal for HTN pt
< 1500 mg/day
aim for at least 1,00 mg/day reduction
what ion should increased dietarily to help with HTN
K+
aim for 3,500-5,000 mg/d
what drug class blocks aldosterone release, vasoconstriction, and Na retention (ultimately lowering BP)
prils, ACEI
name some AE ACEI
- hypotension (in volume depleted pts. i.e. diuretic, HF, renal impairment)
- cough, dry persistent
(more prevalent AA) due ot bradykinin - angioedema (due to bradykinin)
[] is an emergency adverse effect of ACEI and is []x more fatal in AA
angioedema, can happen with ARB too
5x
[] is asymmetric swelling of face, mouth, and upper airway
could be in absence of urticaria or itching
angioedema
ACEI > ARB
what electrolyte disturbance may occur wiht ACEI/ARB
increased K+, due to block in aldosterone
ACEI/ARBS contraindicated in []
pregnancy
- oligohydraminos
- hypotension
- renal failure
- death
renal artery stenosis (BRAS) wont be enough perfusion of glomerulus with artery stenosis and dilation efferent arteriole
how might ACEI/ARB affect the kidney
block constriction of efferent arteriole, less pressure in glomerulus
decreased GFR, increase Scr
what should be monitored while one ACEI/ARB
SCr
if increases >30% there is too much strain on kidney
what kind of dose adjustment is assoc with ACEI/ARB
50% decrease if on diuretics, elderly or with renal impairment
[] have been shown to decrease progression of renal disease and are great for CKD
ACEI/ARB
but caution with AKI
what drugs can be benificial in in HFeEF
ACEI/ARB
can you combine and combo if ACEI, ARB, or renin inhibitor
NOOOOOOO
how would you monitor a patient on ACEI/ARB
- BMP ( K+, SCr) specificially
2. BP
ARBS have {higher/lower] rates of cough and angioedema in comparison to ACEI
lower
can you give an ARB To a pregnant patient
no
- oligohydramnios
- hypotension
- renal failure
- death
if a patient has a cough on an ACEI, what shoul you do next
switch to an ARB
how do you monitor an ARB
- BMP (K+, Scr)
2. BP
what is the primary action of the dipine drugs
DHP CCB
-primarily DILATE blood vessels
AE dipine drugs
DHP CCB
- peripheral edema (may not be relieved by diuretics because it is not a fluid retention issue)
- HA
- dizziness
- flushing
- reflex tachycardia (more likely IR)
caution with dipine drugs
DHP CCB
- unstable angina
- CYP 3A4 interactions
- -simvastatin should not excess 20 mg/day
how do you monitory a DHP CCB
BP
name non DHP CCB
- diltiazem
2. verapamil
caution non DHP CCB
bradycardia
AE NON DHP CCB
- Constipation
- gingival hyperplasia
- bradycardia
- avoid in hf pt.
how would you monitor non DHP CCB
HR, BP
a patient has a HR of 56 BPM, what meds should they avoid?
verapamil, diltiazem, BB “ olols”
interactions with non DHP?
CYP3A4 interactions
-no more than 10 g simvastatin
chlorthalidone is what type of drug
thiazide diuretic
HCTHZ is what kindof ddrug
Thiazide diuretic
MOA chlorthalidone
thiazide diuretic
act on early distal tubule to block reabsorption of Na, Cl, water (HCTZ too) -excretion K + increased -decrease, K, Na, Mg -increase uric acid, glucose, Ca2+
what drug may increase uric acid
diuretics, thiazides ecp.
what drug may increase glucose
thiazide diuretic
what may render HCTZ ineffective
CrCl < 30 (kidneys need to be perfused for thiazide to exert effect)
what drug may cause photosensitivity
thiazide diuretics
chlorthalidone has a [higer/lower] half life than HCTZ
higher, more likley to reduce CV symptoms
ACC/AHA rec. over HCTZ
how would you monitor a patient on a thiazide diuretic
- BMP (Na, K Scr, glucose)
2. BP
fursomide belongs wo what class
loop diuretic
torsemide belongs to what class
loop diuretic
[] diuretics are preferred if there is concomitant renal dysfunction
loop (furosemide, torsemide)
triamterene/HCTZ is a [] diuretic
K sparring
aldosterone blocker is a [] diuretic
K sparring
epleredone is a [] diuretic
K sparing
Spironolactone is a [] diuretic
K sparing
what diuretic is thought to have the weakest diuresis
K SPARRING
what diuretic can be used to offset thiazide induce K+ loss
K sparring
- spironolactone
- triamterene/HCTZ
- aldosterone blocker
- elperedone
what caution should be made with spironolactone/aldosterone blocker/triamterene/HCTZ/elperedone and ACEI/ARB
hyperkalemia,
using K sparing with ACEI/ARB (that already blocks aldosterone and spares K) may lead to too much K
is atenolol selective
yes
is betaxolol selective
yes
is bisoprolol selective
yeS
is metorpolol selective
yes, succ. and tart
is nadolol selective
NO
is propranolol selective
NO
is timolol selective
NO
is carvedilol selective
NO (also with alpha-1 activity)
is labetalol selective
NO (also alpha-1 activity(
what kind of drug is pindolol
BB with intrinsic sympathomimetic
MOA BB
stop angiotensin II from binding target cells in heart
- decreased contractility
- decreased cardiac output
Caustion non selective bb
COPD, asthma, may cause bronchonstriction by blocking B2 (bronchodilate when bound to NE)
what drugs should not be mixed for fear bradycardia
non DHP CCB (verapamil, diltiazem), BB
name the selective BB
beta-1 selective
ABBA MEN
Atenolol Betaxolol Bisoprolol Acebutolol Metoprolol Esmolol Nevivolol
what drug can cause hypoglycemia, how is this mechanism
BB,
epi acts via beta-adrenergic receptors
will increase glucose, but BB will block this action and cause hypoglycemia WIHTOUT warning signs
(only hypoglycemia symptom that will occur is sweating)
what are some AE of BB
- decreased exercise tolerace
- exacerbation decomensated HF
- bronchospasm
- mask hypoglycemia
- depression
- fatigue
- sexual dysfunction
cuation with stopping BB
rebound HTN
what are teh more 1st line HTN drugs
- ACEI/ARB
- CCB
- diuretic
how would you moitor a BB patient
- hr
2. BP
What class does clonidine belong to?
Alpha-2 agonist
what class does methyldopa belong to?
Alpha-2 agonist
what is the MOA of clonidine
alpha-2 agonist
block CNS stimulation to BLOCK increase in vasopressin and sympathetic discharge. (SNS speeds up HR, alpga-2 agonsit will block and constriction)
- decrease peripheral resistance to decrease BP
- VASODILATE
**Remember alpha-2 is the inhibiting factor so you want to AGONIZE it
what is the MOA of methyldopa
alpha-2 agonist
block CNS stimulation to BLOCK increase in vasopressin and sympathetic discharge. (SNS speeds up HR, alpga-2 agonsit will block and constriction)
- decrease peripheral resistance to decrease BP
- VASODILATE
**Remember alpha 2 is the inhibiting factor, so you want to AGONIZE it
What kinds of cautions should you educate your patients on before you give them an alpha 2 agonist
- AVOID with cradycardia or drugs that can cause it ( BB, non DHP)
- rebound HTN with aprubt d/c (like BB)
- may cause orthostatic hypertension
what 2 patient groups are important to keep in mind with alpha-2 agonists
- elderly (orthostatic hypotension)
2. pregnancy (methyldopa PREFFERED)
what drug can be used a patch once weekly to treat HTN?
clonidine, alpha-2 agonist
what HTN drug is preferred in pregnancy
methyldopa
How would you monitor a patient on an alpha-2 agonist
HR, BP
what kind of drug is Aliskiren
a renin inhibitor
MOA Aliskiren
inhibit renin release from kidney, block entire RAAS system
directly block the conversion of angiotensin to angiotensin 1
what 3 drug groups are contraindicated in pregnancy
- ACEI
- ARB
- renin inhibitor
what 3 drug groups should NOT be combined
- ACEI
- ARB
- renin inhibitor
what are some AE of aliskiren
- angioedema
- hyperkalemia
- elevated SCr
- decreased GFR
- hypotenson
What cautions must you consider when Rxing Aliskiren
- pregnancy (cont!)
- BRAS
- angioedema
how would you monitor a patient on aliskiren
- BP
2. BMP (K+, SCr)
Doxazosin is a [] drug
Alpha-1 blocker
remember alpha-1 STIMULATES heart muscle, want to block this
MOA Doxazosin
alpha-1 blocker
vasodilate veins/arteries by inhibiting alpha-1 receptors (when stimulated to vasoconstrict)
AE doxazosin
- orthostatic hypotenstion (esp. after 1st dose and elderly)
- priapaism
according to beer’s criteria [] is NOT Recommended for routine use in HTN due to risk of orthostatic hypotension
doxazosin
what needs monitored for a patient on doxazosin
BP
[] is NOT recommended fo rinital monothereapy due to increased risk CV events
doxazosin
hydralazine belongs to what group
direct vasodilator
minoxodil belongs to what group
direct vasodilator
MOA minoxidil
direact vasodilation, relexation or arteriolar smooth musle (LITTLE EFFECT ON VEINS)
MOA hydralazine
direct vasodilation, relaxation of arteriolar smooth muscle (LITTLE EFFECT ON VEINS)
AE direct vasodilators
reflex tachycardia
edema
hypertrichosis
lupus-like syndrome
HF (retention water and salt)
ischemic heart disease
[] can cause lupus-like syndrome
minoxodil, direct vasodilator
[] can cause hypertrichosis
direct vasodilaotr (minoxodil and hydralazine)
[] should be given with a diuretic to minimize fluid gain
direct vasodilator, hydralazine or minoxodil
[] should be given with a BB to prevent tachycardia and increase myocardial workload
direct vasodilator, hydralazine minoxodil
what is preffered inital therapy for HTN
Ccb
Acei/ARB
Thiazide
CAT
*just never combine ACEI/ARB
what can be given to treat ischemic heart disease?
BB +/- ACEI/ARB
+/- CCB if goal not met
what should be avoided in ischemic heart diseae
atenolol (use any other BB)
What can be used to treat HFrEF?
BB +/- ACEI/ARB
what BB are prefered to treat HFrEF?
- bisoprolol
- carvedilol
- metoprolol suc.
what should be avoided in treatment of HFrEF?
NON-DHP, CCB
what is first like for HFpEF
diuretics
remember hfPef, diuretics make you P
what treatments are best for CKD
ACIE (pref) ARB if cannot tolerate ACEI
for acute intracerebral hemorrhage or acute ischemic stroke, what is important to know when treating these pts.
dont lower NP to quicly
what should be done for secondary stroke prevention?
- wait to start HTN thereapt
- no HX HTN, start only when BP greater than 140/90
- select therapy based on comorbidities
- thiazide, ACEI/ARB
in DM all [] med are appropriate
first line (ACEI.ARB, CCB, Thiazide)
Describe how treatment should be done in AA patients
- use CCB or thiazide first
- Use ACEI/ARB or BB IFFFFFFF HFrEF or CKD
(these are greater than risk AE with BB or ACEI/ARB)
what are 3 preferred drugs in pregnancy
- Nifedipine ER
- Labetalol
- Methyldopa
How should you treat HTN with airway issues like asthma, COPD
- avoid non-selective BB
- use ABBA MEN selective BB
- sympathomimetic agents may raise BB
how to treat HTN pts. with gout
- avoid thiazides (other diuretics may be okay)
define orthostatic hypotension
a decrease in SBP of > 20 mmHG
decreased in DBP of > 10 mmHG
when changing from supine to standing
what drugs put a patient at risk for orthostatic hypotension
- clonidine
- alpha blockers
- sometimes ACEI, ARB, diuretics
most common in vasodilators
start low and titrate up*
describe a hypertensive crisis
SBP > 180 mmHG
DBP > 120 mmHG
when do hypertensive crises require hospitalization and IV antihypertensives
if end-organ damage is present
reduce SBP < 140 mmHG in first hr
SBP < 120 mmHG with IV meds
dont correct too quick, should take hours
name evidences of end organ damage in hypertensive crisis
- encephalopathy
- acute MI
- untable angina
- strokes
- AKI
- aortic anneurysm
if hypertensive crisis present with no end organ damage, what is protocol
reinstiture or intensify PO antihypertensives, arrange f/u