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67 Cards in this Set
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Lecture 155
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Lecture 155
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3 Parts of local anesthetic
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1. Aromatic residue. 2. Intermediate chain (determines degradation. 3. Terminal Amino group
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Which types of anesthetics are excreted which way
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Amides - out liver. Esters - Broken in blood.
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Henderson Hasselbach
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pKa - pH = log (BH/B)
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TTX-R vs TTX-S
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TTX-R contain Na1.8 channel, and conduct pain.
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Epinephrine and local anesthetic -
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Epi increases duration of action. - via decreased blood flow.
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Ca and local anesthetic
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Ca decreases local anesthetic efficacy.
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Local anesthetic site of action
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Na channel - a S6 domain IV
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Lecture 156
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Lecture 156
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ACh synthesis enzyme
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choline acetyltransferase
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Components of the 'Fusion Machine'
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Taxin(binds membrane), Brevin(binds vesicle), S-25(interconnects), Tagmin (senses Ca)
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Myasthenia Gravis
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Auto immune disease w/ reduced # of nicotinic ACh receptors
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Lambert Eaton (myasthenic) syndrome
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Decrease calcium channels on nerve terminal
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Aminoglycoside antibiotics & neuropathy
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Aminoglycoside antibiotics block calcium entry into nerve terminal (Also blocked by Mg2+ & other polyvalent cations
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3 uses of nondepolarizing blockers
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1. Orthopedic manip. 2. Abdominal surgery 3. Bronchoscopy
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4 CI's of SUX
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1. Burns 2. Cardiac Arrythmia 3. Liver disease/ChE def 4. Long use
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2 short term drugs for intubation
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1. SUX 2. Rocuronium
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3 drugs paralytics pop for duration of surgery
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1. Vecuronium 2. Atracurium 3. Pancuronium
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Which drug reverses nondepolarizing block
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Anticholinesterases (neostigmine) because nondep block is competitive inhib
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Which 2 non-dep blockers are excreted by liver
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Vecuronium, Rocuronium
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159
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159
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Explain adrenergic control of the blood vessels.
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Skin and periphery are innevated by sympathetic alpha receptors. Muscles and liver have b2 receptors so they dilate in response to epinephrine
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Explain ANS control of sexual function
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Parasympathetic: Erection and mucus production, Sympathetic: alpha 2 inhibit erection alpha 1 cause detumescence
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Accomodation is controlled by:
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Parasympathetic NS
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3 classes of drugs that cause orthostatic hypertension
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a1 blockers, Adrenergic neuron blockers, ganglionic blockers
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160
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160
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How do muscarinic and nicotinic receptors differ?
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Muscarinic have are smaller - bind a diff O on ACh
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Explain how PS innervation slows heart rate.
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Inhibitory G protein - opens potassium channels, resulting in hyperpolarization.
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Explain how PS innervation vasodilates
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ACh causes release of EDRF --> cGMP
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Contraindications to muscarinic agonists
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SOAPT - Shock (cardiogenic), obstruction, asthma, peptic ulcers, hyperthyroid
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SLUD syndrome
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Salivations Lacrimation Urinary Defecation in irreversible acetylcholinesterase inhibitors. Also cause twitching in muscles and CNS effects
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Explain AChesterase
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Anionic site holds the Ach near to a serine (which partially shares electrons with a nearby histamine) and it's hydrolyzed)
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How does edrophonium work?
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Blocks the histamine on ChE
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How do the nerve gasses work?
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Phosphate groups binds to serine in ChE
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Treatment of anti-cholinesterase inhibitors?
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Atropine + 2-PAM
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Explain how Atropine can treat parkinsons
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Parkinsons is a misbalance between Dopamine and Ach. Atropine acts to block the Ach and even out the process (in the nigro striatal pathway)
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Atropine Toxicity
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Dry, Hot, Red, Blind, Mad
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CNS cholinergic muscarinic sites
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Emesis, Arousal, Memory,
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Effects of ganglion blockers
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Mostly similar to Atropine, except vasodilation.
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162
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162
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MAO
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Monoamine Oxidase - hyrdolyzes adrenergics in nerve & effector
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COMT
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Hydrolizes adrenergics in effector only.
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Uptake 1 vs 2
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Uptake 1: High affinity low capacity. Uptake 2: low affinity high capacity
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VMA
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Product of MAO dehydrogenase in periphery
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MHPG
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Product of MAO reducatase in CNS
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167
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167
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Alpha binding
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EPI > NE (no ISO)
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Beta binding
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ISO > EPI >> NE (NE no effect on B2)
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How do Alpha 1 receptors transduce signal?
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Phospholipase C --> Inc. Ca. (SOC's & CRAC channel activated too)
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How do Beta receptors work?
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G-proteins --> cAMP --> PKA
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How do Alpha 2 receptors work?
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Control channels via G protein (G protien --> Block ATP, Block Ca, open K)
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NE receptors
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alpha, beta 1
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EPI receptors
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alpha, beta 1, beta 2
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ISO receptors
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Beta 1, Beta 2
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Principal effects of alpha 2 agonists
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Decrease CO, decrease vascular resistance.
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How is clonidine used to distinguish b/t pheochromocytoma and essential hypertension?
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It will reduce NE in EH not pheo.
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Explain the mechanism of tyramine
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Indirect acting sympathomimetic. Enters nerve terminal via uptake 1, pushes NE out.
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3 problems w/ indirect sympathomimetics
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1. Tachyphylaxis. 2. Don't work w/ unptake 1 inhibitors. 3. Hypertensive crisis w/ MAO inhibitor.
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Tachyphylaxis
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Depletion of NE w/ indirect sympathomimetics --> reduced response.
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How do ephedrines work?
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Work by both indirect actions as well as agonists (esp of B2)
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Toxicity of ephedrines
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Very high doses --> a1 peripheral vasoconstriciton.
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Explain nasal congestions
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a1 controlled venous capacitance vessels (erectile) fill, & secrete mucous. Prolonged inhibition blocks the arterioles, and reactive hyperemia occurs.
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Nasal Decong. OD
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Eventually, dose affects alpha 2 receptors - venoconstriction & damage to nasal mucosa.
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What are the primary and secondary treatments for cardifenic shock
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Primary: Dobutamine - specific B1. Secondary : Dopamine - Nonspecific Adrenergic (causes vasoconstriction), may worsen myocardial ischemia.
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How is yombine an aphrodisiac
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Blocks a2 - PARASYMPATHETIC alpha 2 receptors inhibit tumescence.
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Contraindications go phosphidiesterase inhibitors
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No Nitrates or A1b blockers.
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Name three adrenerginic neuron blockers
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Bretylium, Reserpine, Guanethidine. (Sympahtolytics)
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