ANS Flashcards

1
Q

a-1 agonist effects

A

increases vascular smooth muscle contraction (vasoconstriction), mydriasis increases intestinal and bladder sphincter muscle contraction, glucose metabolism

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2
Q

a-2 agonist effects

A

decreases sympathetic tone, inhibits glucose metabolism and insulin release, lipolysis
inhibits the release of NE
­increases platelet aggregation, aqueous humor

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3
Q

b-1 agonist effects

A

increases HR,­ contractility, ­dromotropy, EF%
renin release
increases hunger r/t ghrelin release in stomach

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4
Q

b-2 agonist effects

A

vasodilation, bronchodilation
Increases: lipolysis, ­renin release
inhibits insulin release and stimulates gluconeogenesis and glucolysis
Decreases: uterine tone, relaxes ciliary muscle

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5
Q

DA-1 agonist effects

A

renal, cerebral, coronary and splanchnic arteries vasodilation

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6
Q

DA-2 agonist effects

A

modulates neurotransmitter release

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7
Q

Primary autonomic muscarinic receptor locations

A

M1 - postganglionic neurons of autonomic ganglia
M2- Heart, smooth muscle
M3 - glands, sweat, salvation, smooth muscle, endothelium

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8
Q

Primary autonomic nicotinic receptor locations

A

N1/Nm - skeletal muscles/NMJ

N2/Nn - postganglionic neurons

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9
Q

Two esterases that hydrolyze Ach?

A

Acetylcholinesterase

Plasma cholinesterase

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10
Q

Where are adrenergic receptors found presynaptically?

A

a-2 and DA-2

autoregulation that provides negative feedback

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11
Q

Where are adrenergic receptors found postsynaptically?

A

on target tissues/end organs

  • cardiac muscle
  • smooth muscle
  • gland cells
  • renal vasculature
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12
Q

3 naturally occurring catecholamines

A

norepi
epi
dopamine

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13
Q

catecholamine enzyme metabolism

A

COMT and MAO

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14
Q

Non-selective Catecholamines

A

Epi, Norepi, Dopa

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15
Q

Examples of direct agonists & receptor-selective Catecholamines

A

Phenylephrine (a-1)
clonidine (a-2)
dobutamine (b-1)
albuterol (b-2)

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16
Q

Indirect acting agonists

A

cocaine, amphetamine

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17
Q

Mixed Indirect/Direct agonist

A

ephedrine

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18
Q

a-1 agonists examples

A

phenylephrine

methoxamine

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19
Q

a-2 agonist examples

A

clonidine
alpha-methyl-dopa
dex

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20
Q

Mixed alpha/beta agonists examples

A

norepi

epi

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21
Q

b-1 selective agonist example

A

dobutamine

22
Q

nonselective b-(1&2) agonist example

A

isoproterenol

23
Q

b-2 selective agonists examples

A

albuterol, terbutaline, metaproterenol

24
Q

a-1 selective antagonist examples

A

prazosin, terazosin, doxazosin, tamsulosin

25
non-selective alpha antagonists
inhibitory, sympatholytics phentolamine (competitive) phenoxybenzamine (non-competative/irreversible)
26
sympathomimetics are (agonists/antagonists)
agonists
27
sympatholytics are (agonists/antagonists)
antagonists | "blockers"
28
Mixed adrenergic (alpha/beta) antagonist
labetalol
29
Nonselective beta antagonists
propranolol, pindolol, timolol
30
B-1 selective antagonists
``` BEAM (cardiac selective) betaxolol esmolol atenolol metoprolol ```
31
Use ____ with caution in pts with asthma
B-2 blockers
32
Use ___ with caution in patients with cardiac insufficiency
beta-blockers - can decrease HR, contractility, and reduce CO
33
pheochromocytoma
adrenal gland tumor causes the release of catecholamines use non-selective alpha-blockers - phenoxybenzamine - phentolamine
34
Norepi infusion rate
0.01-3 mcg/kg/min | 1-20 mcg/min
35
Epi infusion rate
0.02-2 mcg/kg/min | 1-20 mcg/min
36
Dopamine infusion rate
5-10 mcg/kg/min
37
Dobutamine infusion rate
.5-20 mcg/kg/min
38
Isoproterenol infusion rate
0. 5-5 mcg/min | uses: heart blocks, transplants
39
phenylephrine dosing
bolus: 50-100 mcg pushes q1-2 min for hypotension infusion: 10-200 mcg/min
40
esmolol dosing
bolus: 0.5-1mg/kg over 30 seconds infusion: 50-300 mcg/kg/min
41
labetalol dosing
5-80 mg IV
42
a1 receptors: autonomic review
- postsynaptic | - Gq protein coupled, activates phospholipase C, PIP2 --> IP3 + Dag
43
a2 receptors: autonomic review
- presynaptic | - Gi protein coupled, inhibits Adenyl cyclase, ATP --> X --> cAMP
44
b1 & b2 receptors: autonomic review
- postsynaptic | - Gs protein coupled, activates adenyl cyclase, ATP --> cAMP
45
Factors that affect Blood pressure
CO (HR x SV) | Total peripheral resistance
46
Factors that affect HR + Contractility
increased by: SNS activity, B1 + Epi | decreased by: PSNS
47
Factors that affect stroke volume
``` contractility venous return (preload) ```
48
factors that affect venous return
blood volume is increased by: aldosterone, ADH, SNS blood volume is decreased by: ANP venous tone is increased by: SNS activity + Epi
49
factors that affect total peripheral resistance
circulating factors innervation viscosity of blood local regulators
50
circulating factors that affect total peripheral resistance
increased by: ang-II, Epi, NE, ADH
51
innervation that affects total peripheral resistance
increased by: A1 receptors + NE | decreased by B2 receptors + Epi
52
local regulators that affect total peripheral resistance
increased by: endothelin, O2 | decreased by: NO, H+, adenosine, PG, Bradykinin