adrengenics Flashcards
SYMPATHETIC NERVOUSSYSTEM
▪mediates Organ systems, blood pressure
▪Hormone (epi from adrenal medulla) vs. neurotransmitter (NE)
rate limiting step NE release
Tyr to dopa
NEUROTRANSMITTER TERMINATION NE vs Ach
▪Acetylcholine: ACh-esterase, 150ms FAST
▪Norepinephrine: Reuptake
▪Monoamine oxidase (Pregang)
▪Catechol-OMethyltransferase (postgang)
direct sympathetic agonists
effects depend on?
bind to receptors
effect depends on: route, affinity, expression of receptor subtypes
indirect sympathetic agonists mechanisms
▪Indirect: Catecholamine displacement (Amphetamines)
▪Decreased NE clearance: Reuptake inhibition
ADRENERGIC RECEPTORS
▪α1 α2
▪β1 β2
▪Dopamine
▪Sympathomimetic (sym effects) vs sympatholytic (opposes sym effects)
states dowregulating adrengenic receptors
▪Congestive Heart Failure (CHF)
▪Acidosis
▪Hypoxia
and sepsis
A1 functions
works at peripheral vas beds, sympathomimetic
▪Vasoconstriction=Blood pressure increased
▪Mydriasis (dilated pupils)
▪Urinary sphincter constriction
A2 functions
symphatolytic
▪In the vasculature
▪Inhibition of NE and ACh
▪Decreased sympathetic tone
▪Decreased BP
▪Sedation
B1 functions
sympathetimetic
▪Cardiac excitation
▪Increased rate, contractility, conduction (chronotrophy and ionotrophy with increased Ca)
B2 functions
sympathetlytic
▪Bronchodilation
▪Smooth muscle relaxation
▪Skeletal muscle vasodilation
▪Decreased vascular resistance
Dopa receptor function
▪Resistance vessel vasodilation to increase blood flow at:
▪Renal
▪Splanchnic
▪Coronary
▪Cerebral
catecholamines
1 ones?
where each is from?
▪Dopamine (DA) and norepinephrine (NE)= Primary catecholamines
▪DA – Brain and kidney
▪NE – Sympathetic nerve endings
▪Epinephrine – Adrenal medulla
NE binding affinties?
A1>B1>B2
NE
▪Primary neurotransmitter at?
▪Maintenance of?
BP?
▪ cardiac output changes
▪ chronotropic changes
▪ coronary blood flow
▪Endogenous
▪Primary neurotransmitter at sympathetic nerve endings
▪Maintenance of sympathetic tone
▪⇧BP
▪No cardiac output changes
▪Minimal chronotropic changes
▪Increased coronary blood flow
NE uses
spetic shock or hypotensive pts with fluids administered first
NE caution
porlonged use: cardiac cell death
Epi
▪Only released by
▪ released for?
coronary blood flow effect?
▪Caution?
▪Endogenous
▪Only released by adrenal medulla
▪Stress preparation
▪⇧coronary blood flow
▪Caution prolonged infusions
epi affinities
A1 at high doses and B1/2 at lower doses
epi uses based on dosage?
can be used for?
high doses: increase bp and hr
lower doses; beta effects
can be used for anaphylaxis and with LA
DA
▪Endogenous
▪NE precursor
DA affinities
- DA receptor
- A1,B1,B2 all similar
DA Dose-specific effects
▪Low dose (0.5 – 3 mcg/kg/min): DA effects
▪Intermediate (3 – 10 mcg/kg/min): B effects
▪High (10 – 20 mcg/kg/min): A effects
DA uses
can bes used as a NE reuptake inhibitor at intermediate doses to increase iono/chrono at heart and increase BP
caution with DA
can increase risk of V fib
dobutamine
▪ from?
▪Augments?
▪Dose-dependent increase in?
▪Alpha effects?
▪Beta-mediated effect? dose?
▪High dose increases?
▪Synthetic
▪Augments myocardial contractility
▪Dose-dependent increase in stroke volume and cardiac output
▪Alpha agonist AND antagonist
▪Beta-mediated vasodilation (low dose)
▪High dose increases myocardial O2 consumption
dobutamine affinity
- B1
- B2
- A1
dobutamine uses
B1 agonist used for cardiac stress test, unstable cardiogenic shock (short t1/2)
phenylephrine
▪made?
▪ A/B?
▪ metab?
▪HR?
▪Push dose?
▪Synthetic
▪All alpha, no beta
▪Not a catechol derivative, not metabolized by COMT BUT still by MAO
▪Can lead to baroreceptor mediated decrease in HR
▪Push dose pressor for short-term hypotension
phenylepherine affinity
A1
phenylepherine uses
push dose pressor for short term hypotension and as a nasal decongestant
milrinone
▪ inhibitor?
▪Inhibits breakdown of?
▪inotropy?
▪ vaso effect?
▪Increased?
▪Reduced?
▪Good in the setting of?
▪Phosphodiesterase-3 inhibitor
▪Inhibits breakdown of cAMP
▪Positive inotropy
▪Potent vasodilator
▪Increased diastolic relaxation
▪Reduced preload and afterload
▪Good in the setting of receptor downregulation
milrinone affinity?
no binding but has:
1. B1 like effects
2. B2 like effects
milrinone use
HF
vasopressin
▪AKA
▪Stored in?
▪Released when?
▪receptor agonist?
▪Neutral to negative impact on?
▪Dose dependent effects?
▪Not affected by?
▪AKA: antidiuretic hormone
▪Stored in posterior pituitary
▪Released when plasma osmolality increases or BP drops
▪V1 (vasoconstrict) and V2 (retain volume) receptor agonist
▪Neutral to negative impact on CO
▪Dose dependent SVR and vagal tone increase
▪Not affected by pH
ADH affinity? resembles effects of what receptor?
V1 and 2: A1 like effects
ADH uses
pts with acidosis to increase bp
A2 selective agonists
Clonidine
Dexmedetomidine
Guanfacine
Methyldopa
Clonidine, Dexmedetomidine, Guanfacine, Methyldopa
▪bp?
▪Effective?
▪Class effect =
▪Drop BP by reducing sympathetic tone
▪Effective antihypertensive
▪Class effect = sedation
A2 AGONISTS
long term clonidine oral effect
candidasis
Dexmedetomidine effects
no effects on bp, all sedative
A2 agonist
guanfacine use
ADHD; activates A2 in PF cortex to incrase focus
methyldopa key use
HTN tx during pregnancy
INDIRECT ACTING
SYMPATHOMIMETICS
mechanisms
▪Displacers of stored NE
▪Reuptake inhibition
increasing effects of endogenous NE
▪Amphetamine
▪ CNS uptake
▪effect?
▪Effects mediated by?
▪Rapid CNS uptake
▪Stimulant
▪Effects mediated by NE and DA (indirect sympathetomeitic)
▪Methylphenidate (Ritalin)
▪ variant?
▪ effect?
▪Use:
▪Caution?
teeth/drug tests?
▪Amphetamine variant/ amphetamine like molecule
▪Similar effect and abuse potential to amphetamine
▪Use: ADD-spectrum
▪Caution - UDS
no effects on teeth
postive on drug tests
amphetamine oral effects
destroys teeth
▪Modafinil (Provigil)
▪role?
▪Totally different from?
▪NE, DA?
▪NE, DA, 5-HT3, glutamate?; GABA?
▪Use:
▪Psychostimulant
▪Totally different from amphetamine but a amp like molecule
▪NE, DA reuptake inhibition
▪NE, DA, 5-HT3, glutamate increase; GABA decrease
▪Use: narcolepsy
▪Straterra
▪ MOA
▪CV effects
▪similar effects as what other drug?
▪Use:
▪Selective NE reuptake inhibition
▪No CV effects
▪Clonidine-like effect
▪Use: ADD
▪Cocaine
▪Local?, peripheral?
▪mechanism?
▪sign of abuse (mental)
▪Avoid?
▪Use:
▪Local anesthetic, peripheral sympathomimetic
▪Reuptake inhibition,especially dopamine
▪Excited delirium
▪Avoid concurrent betablockade
▪Use: epistaxis
Excited delirium
seen with cocaine abuse, increased DA in brain can lead to aggression ith increased temp folllowed by sudden res/cardaic arrest
goal would be to get pt sedated
why avoid betablockade with coke
increased risk MI, HR will decrease but A effects of coke active=vasoconstrict
Beta agonism and asthma
BETA-? AGONISM
▪Commonality?
▪Triggered by?
▪Angioedema?
BETA-2 AGONISM
▪Key to management of acute asthma
▪Common “allergy” in dentistry (7.9%)
▪Triggered by allergens, stress, food, drugs
▪Angioedema = similar but different
short acting beta agonsits (SABA)
Albuterol
Levalbuterol
Terbutaline
SABA used for:
short term control with fast onset and short duration
albuterol
acute managment, B2 agonist but also B1 so HR may increase (can pt handle?)
Levalbuterol
L sterioisomer of albuterol
used instead of albuterol for no B1 effect
terbutaline
SABA used in severe cases: IV/IM administration
LABAs
Formoterol
Salmeterol
LABA use
▪used in conjunction with?
▪Blocks receptors for?
▪NOT FOR?
▪Longer term control, used in conjunction with SABA/steroids
▪Blocks receptors 12-18h
▪NOT FOR ACUTE ATTACKS
dulera
formoterol + mometasone
LABA
symbicort
formoterol +budesonide
LABA
advair
salmeterol + fluticasone
LABA
DENTAL MANAGEMENT OF ASTHMA PATIENTS
▪Minimize likelihood?
▪Talk to your patient to learn?
▪Instruct pt. to bring?
▪Decrease?
▪Minimize likelihood of exacerbation
▪Talk to your patient to learn their management
strategies
▪Instruct pt. to bring albuterol inhaler to all appointments
▪Decrease stressors
▪Drug considerations of asthma pts
ASA/NSAIDS?
antihistamines?
cholergenics?
opioids?
▪No ASA or NSAIDS
▪Avoid histaminic drugs, triggers attack
▪Avoid antihistamines, decreased secretions= attack
▪Avoid cholinergics, increased secretions= attack
no opioids (morphine)
in an asthma emergency administer:
▪Supplemental O2
▪Consider epinephrine: 0.3 mg IM (or use EpiPen)
types of alpha receptor antagonists
▪Reversible
▪Concentration dependent
▪Duration dependent on t1/2
▪Irreversible
▪Body has to generate new receptors
▪Drug effect can persist even after drug is cleared
A1 antagonists common adr
▪α1 blockade blocks vasoconstriction which can lead to Orthostatic hypotension
other effect A antag
▪Miosis, nasal stuffiness
▪Decreased resistance to urinary flow
phenoxybenzamine use
A non-comp antag for pheochromocytoma
phentolamine
▪Blocks?
▪Decreased?
▪ADR?
▪Blocks α1 and α2
▪Decreased PVR and cardiac stimulation
▪ CV adverse reactions: tachycardia with ischemia due to decrased VR
uses of phentolamine
pheochromocytoma
reverse LA in soft tissue
reduce extravasation rxns
selective A1 blockers
prazosin
terazosin
doxazosin
prazosin, terazosin, doxazosin
Selective?
functions?
% bioavailability
Selective α1 antagonists
▪Arterial and venous vascular smooth muscle relaxation and prostate relaxation
▪50% bioavailability, First pass effect
t1/2
▪Prazosin:
▪Terazosin:
▪Doxazosin:
▪Prazosin: 3h
▪Terazosin: 9h
▪Doxazosin: 22h
▪Prazosin, Terazosin, Doxazosin use?
chronic HTN
what side effect is common in selective A1 blockers
ortho hypoten
tamsulosin
▪effect?
▪ bioavailability?
▪More specific to?
▪Less?
▪Competitive α1 blocker
▪High bioavailability
▪More specific to prostate
▪Less orthostatic hypotension= safest for BPH
beta blockers
▪Antagonize effects of?
▪Differ in affinity for?
▪β1 specificity decreases with?
▪End in?
▪Antagonize effects of catecholamines and beta agonists
▪Differ in affinity for β1 and β2
▪β1 specificity decreases as dose increases
▪End in -lol (-olol, -ilol,-alol)
-olol
B only block
-ilol, -alol
B block with likely A effects
▪Labetalol, carvedilol receptor affinty
▪β1= β2 > α1 > α2
▪Metoprolol, betaxolol, acebutolol,
esmolol, atenolol, nebivolol receptor affinty
▪β1»> β2
▪Propranolol, carteolol, penbutolol,
pindolol, timolol receptor affinty
β1= β2
beta 1 specific blockers, when are these useful?
Betaxolol
Esmolol
Acebutolol
Metoprolol
Atenolol
Nebivolol
use for asthma, do not want to affect B2 with a non-specific block
esmolol
▪selective
▪t1/2
▪onset
▪Requires what for administration?
▪Great for?
▪Beta-1 selective blocker
▪Short t1/2
▪Quick onset
▪Requires central line for administration (IV)
▪Great for tight BP control in aortic dissection
labetalol
▪blockade of
▪ b;a ratio oral and IV
▪duration of action, up to?
▪Beta and alpha blockade
▪3:1 oral
▪7:1 IV
▪Dose dependent duration of action, up to 20 hours
safer Rx for asthma pts?
B1 specifc blockers, do not want to block B2 which could affect bronchodialtion
nonspecific β-blockers and epi
▪Caution with nonspecific β-blockers and epi, nonspecific block will antagonize epi
works at peripheral vas beds, sympathomimetic
▪Vasoconstriction=Blood pressure increased
▪Mydriasis (dilated pupils)
▪Urinary sphincter constriction
A1 functions
symphatolytic
▪In the vasculature
▪Inhibition of NE and ACh
▪Decreased sympathetic tone
▪Decreased BP
▪Sedation
A2 functions
sympathetimetic
▪Cardiac excitation
▪Increased rate, contractility,
conduction (chronotrophy and ionotrophy with increased Ca)
B1 functions
sympathetlytic
▪Bronchodilation
▪Smooth muscle relaxation
▪Skeletal muscle vasodilation
▪Decreased vascular resistance
B2 functions
▪Resistance vessel vasodilation to increase blood flow at:
▪Renal
▪Splanchnic
▪Coronary
▪Cerebral
Dopa receptor function
A1>B1>B2
NE binding affinties?
▪Endogenous
▪Primary neurotransmitter at sympathetic nerve endings
▪Maintenance of sympathetic tone
▪⇧BP
▪No cardiac output changes
▪Minimal chronotropic changes
▪Increased coronary blood flow
NE
▪Primary neurotransmitter at?
▪Maintenance of?
BP?
▪ cardiac output changes
▪ chronotropic changes
▪ coronary blood flow
spetic shock or hypotensive pts with fluids administered first
NE uses
porlonged use: cardiac cell death
NE caution
▪Endogenous
▪Only released by adrenal medulla
▪Stress preparation
▪⇧coronary blood flow
▪Caution prolonged infusions
Epi
▪Only released by
▪ released for?
coronary blood flow effect?
▪Caution?
A1 at high doses and B1/2 at lower doses
epi affinities
high doses: increase bp and hr
lower doses; beta effects
can be used for anaphylaxis and with LA
epi uses based on dosage
▪Endogenous
▪NE precursor
DA
- DA receptor
- A1,B1,B2 all similar
DA affinities
▪Low dose (0.5 – 3 mcg/kg/min): DA effects
▪Intermediate (3 – 10 mcg/kg/min): B effects
▪High (10 – 20 mcg/kg/min): A effects
DA Dose-specific effects
can bes used as a NE reuptake inhibitor at intermediate doses to increase iono/chrono at heart and increase BP
DA uses
can increase risk of V fib
caution with DA
▪Synthetic
▪Augments myocardial contractility
▪Dose-dependent increase in stroke volume (SV) and cardiac output (CO)
▪Alpha agonist AND antagonist
▪Beta-mediated vasodilation (low dose)
▪High dose increases myocardial O2 consumption
dobutamine
▪ from?
▪Augments?
▪Dose-dependent increase in?
▪Alpha effects?
▪Beta-mediated effect? dose?
▪High dose increases?
- B1
- B2
- A1
dobutamine affinity
cardiac stress test, unstable cardiogenic shock (short t1/2)
dobutamine uses
▪Synthetic
▪All alpha, no beta
▪Not a catechol derivative, not metabolized by COMT BUT still by MAO
▪Can lead to baroreceptor mediated decrease in HR
▪Push dose pressor for short-term hypotension
phenylephrine
▪made?
▪ A/B?
▪ metab?
▪Can lead to?
▪Push dose?
A1
phenylepherine affinity
push dose pressor for short term hypotension and as a nasal decongestant
phenylepherine uses
▪Phosphodiesterase-3 inhibitor
▪Inhibits breakdown of cAMP
▪Positive inotropy
▪Potent vasodilator
▪Increased diastolic relaxation
▪Reduced preload and afterload
▪Good in the setting of receptor downregulation
milrinone
▪ inhibitor?
▪Inhibits breakdown of?
▪inotropy?
▪ vaso effect?
▪Increased?
▪Reduced?
▪Good in the setting of?
no binding but has:
1. B1 like effects
2. B2 like effects
milrinone affinity
HF
milrinone use
▪AKA: antidiuretic hormone
▪Stored in posterior pituitary
▪Released when plasma osmolality increases or BP drops
▪V1 (vasoconstrict) and V2 (retain volume) receptor agonist
▪Neutral to negative impact on CO
▪Dose dependent SVR and vagal tone increase
▪Not affected by pH
vasopressin
▪AKA
▪Stored in?
▪Released when?
▪receptor agonist?
▪Neutral to negative impact on?
▪Dose dependent effects?
▪Not affected by?
A1 like effects
ADH affinity?
pts with acidosis to increase bp
ADH uses
Clonidine
Dexmedetomidine
Guanfacine
Methyldopa
A2 selective agonists
▪Drop BP by reducing sympathetic tone
▪Effective antihypertensive
▪Class effect = sedation
Clonidine, Dexmedetomidine, Guanfacine, Methyldopa
▪bp?
▪Effective?
▪Class effect =
A2 AGONISTS
candidasis
long term clonidine oral effect
no effects on bp, all sedative
A2 agonist
Dexmedetomidine effects
ADHD; activates A2 in PF cortex to incrase focus
guanfacine use
HTN tx during pregnancy
methyldopa key use
▪Rapid CNS uptake
▪Stimulant
▪Effects mediated by NE and DA (indirect sympathetomeitic)
▪Amphetamine
▪ CNS uptake
▪effect?
▪Effects mediated by?
▪Amphetamine variant/ amphetamine like molecule
▪Similar effect and abuse potential to amphetamine
▪Use: ADD-spectrum
▪Caution - UDS
no effects on teeth
postive on drug tests
▪Methylphenidate (Ritalin)
▪ variant?
▪ effect?
▪Use:
▪Caution?
▪Psychostimulant
▪Totally different from amphetamine but a amp like molecule
▪NE, DA reuptake inhibition
▪NE, DA, 5-HT3, glutamate increase; GABA decrease
▪Use: narcolepsy
▪Modafinil (Provigil)
▪role?
▪Totally different from?
▪NE, DA?
▪NE, DA, 5-HT3, glutamate?; GABA?
▪Use:
▪Selective NE reuptake inhibition
▪No CV effects
▪Clonidine-like effect
▪Use: ADD
▪Straterra
▪function
▪CV effects
▪?-like effect
▪Use:
▪Local anesthetic, peripheral sympathomimetic
▪Reuptake inhibition,especially dopamine
▪Excited delirium
▪Avoid concurrent betablockade
▪Use: epistaxis
▪Cocaine
▪Local?, peripheral?
▪mechanism?
▪sign of abuse (mental)
▪Avoid?
▪Use:
Albuterol
Levalbuterol
Terbutaline
short acting beta agonsits (SABA)
acute managment, B2 agonist but also A1 so HR may increase (can pt handle?)
albuterol
L sterioisomer of albuterol
used instead of albuterol for no A1 effect
Levalbuterol
SABA used in severe cases: IV/IM administration
terbutaline
Formoterol
Salmeterol
LABAs
▪Advair = salmeterol + fluticasone
▪Symbicort = formoterol +budesonide
▪Dulera – formoterol + mometasone
LABA + steroid formulations
▪α1 blockade blocks vasoconstriction
▪Can lead to Orthostatic hypotension
A antag CV pharm effects
▪Miosis, nasal stuffiness
▪Decreased resistance to urinary flow
other effect A antag
A non-comp antag for pheochromocytoma
phenoxybenzamine use
▪Blocks α1 and α2
▪Decreased PVR and cardiac stimulation
▪Can lead to CV adverse reactions: tachycardia with ischemia due to decrased VR
phentolamine
▪Blocks?
▪Decreased?
▪ADR?
pheochromocytoma
reverse LA in soft tissue
reduce extravasation rxns
uses of phentolamine
prazosin
terazosin
doxazosin
selective A1 blockers
Selective α1 antagonists
▪Arterial and venous vascular smooth muscle relaxation and prostate relaxation
▪50% bioavailability, First pass effect
prazosin, terazosin, doxazosin
Selective?
functions?
% bioavailability
▪Competitive α1 blocker
▪High bioavailability
▪More specific to prostate
▪Less orthostatic hypotension= safest for BPH
tamsulosin (flomax)
▪effect?
▪ bioavailability?
▪More specific to?
▪Less?
▪Antagonize effects of catecholamines and beta
agonists
▪Differ in affinity for β1 and β2
▪β1 specificity decreases as dose increases
▪End in -lol (-olol, -ilol,-alol)
beta blockers
▪Antagonize effects of?
▪Differ in affinity for?
▪β1 specificity decreases with?
▪End in?
▪β1= β2 > α1 > α2
▪Labetalol, carvedilol receptor affinty
▪β1»> β2
▪Metoprolol, betaxolol, acebutolol,
esmolol, atenolol, nebivolol receptor affinty
β1= β2
▪Propranolol, carteolol, penbutolol,
pindolol, timolol
▪Beta-1 selective
▪Short t1/2
▪Quick onset
▪Requires central line for administration (IV)
▪Great for tight BP control in aortic dissection
esmolol
▪selective
▪t1/2
▪onset
▪Requires what for administration?
▪Great for?
▪Beta and alpha blockade
▪3:1 oral
▪7:1 IV
▪Dose dependent duration of action, up to 20 hours
labetalol
▪blockade of
▪ b;a ratio oral and IV
▪duration of action, up to?
which beta blockers have both B and A effects?
labetalol and carvedilol
which beta blockers have mainly B1 effects? (B1 specific)
BE A MAN
betaxolol
esmolol
atenolol
metoprolol
acebutolol
nebivolol
which beta blockers have equal B1 and 2 effects
propranolol
carteolol
penbutolol
pindolol
timolol