Autonomic nervous system Flashcards

(18 cards)

1
Q

alpha 1 receptor effects

A

Most vascular smooth muscle contraction, increased force on heart, prostate contraction, pupillary dilator muscle contraction (pupil dilation)

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2
Q

alpha 2 receptor effects

A

Postsynaptic CNS (decrease SNS tone), presynaptic ANS (decreased NT release), some vascular smooth muscle contraction

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3
Q

beta 1 receptor effects

A

heart (increased force and rate), Juxtaglomerular cells (increase renin release)

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4
Q

beta 2 receptor effects

A

relaxation of Skeletal muscle blood vessels, relaxation of Bronchial smooth muscle, uterus relaxation

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5
Q

beta 3 receptor effects

A

Increased lipolysis in fat cells

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6
Q

epinephrine activates which receptors

A

all (alpha1&2, beta 1,2&3) (the fight or flight hormone)

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7
Q

epinephrine effects

A

Cardiac - Positive inotropic and chronotropic effect.
Vascular: Vasoconstriction (splanchnic) and vasodilation (skeletal muscle)
Smooth muscle - Relaxation of GI, uterine and bronchial.
Metabolic - Elevates serum glucose and free fatty acids.

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8
Q

epinephrine clinical use

A
Cardiac arrest
Acute bronchospasm
Anaphylaxis
Surgical bleeding
Promote local hemostasis and to decrease systemic absorption of local anesthetics
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9
Q

epinephrine pharmacodynamics

A

ALL catecholamines are extensively metabolized in gut and liver following PO administration (first pass phenomenon) due to abundance of COMT. Epi not administered orally; Excretion - Rapidly inactivated in body by COMT or MAO. Metabolites excreted in urine. Duration of action 1-4 hr.

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10
Q

epinephrine adverse effects

A

angina, anxiety/fear, cardiac arrhythmias, dyspnea, headache, hypertension, peripheral vasoconstriction, tissue necrosis, tremor

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11
Q

norepinephrine activates which receptors?

A

all but beta 2

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12
Q

norepinephrine effects

A

Similar to epinephrine, except do not see relaxation of smooth muscle from β2 activation (i.e. bronchial smooth muscle). No relaxation of skeletal smooth muscle vasculature- therefore, increases in blood pressure are more exaggerated.

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13
Q

Norepinephrine: Clinical Use

A

Cardiogenic shock
Septic shock
Hypotension

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14
Q

Duration of action of norepinephrine

A

shorter than epinephrine

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15
Q

norepinephrine administration

A

only IV

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16
Q

norepinephrine adverse effects

A

Similar to epinephrine, except hypertension is more pronounced due to α1 stimulation without β2 balance.

17
Q

Dopamine Receptor Activation and Effects (outside CNS)

A

D1: Vasodilation. Especially prominent in renal vasculature.

D2: Presynaptic receptors. Negative feedback to inhibit further norepinephrine, and possibly dopamine release.

β1: Positive inotropic and chronotropic effect

α1: Seen only at high doses. Causes vasoconstriction.

18
Q

Dopamine: Clinical Use

A

Cardiogenic shock
Septic shock
Hypotension

Remember-High dose stimulates a1 and b1
just like norepinephrine.