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26 Cards in this Set
- Front
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nicotinic receptors
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NICOTINIC TYPE I-R
=autonomic ganglia (SNS & PSNS): in both SNS & PSNS, 1st neuron releases ACh on N1-R -also, adrenal medulla: 2nd neuron releases Ach on N1 receptor of adrenal medulla. (Then, adrenal medulla secretes Epi (the only thing that releases Epi.)) agonists (enhance Na conductance) *nicotine *Ach antag ("ganglionic blocking drugs"): *triMETHaphan *hexaMETHonium -------------------------- NICOTINIC TYPE II-R =SkM motor endplate agonists: Ach succinylcholine antag: "the --curiums & --roniums": ~d-tubocurarine (d-tc) [non-depol NMB) ~pancuronium ~Mg++ |
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sodium channels
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I. Na+ in cardiac fast fibers (atria, ventricles):
class 1A Rx: proCAINamide, disopyramide, quinidine *all 3 inhibit repol==>prolong ERP *only quinidine incr Q-T interval (can lead to Toursaud) class 1B: lidoCAINe (only affects ventricles) *accelerates repolarization==>shortens ERP II. Na+ channels in CNS: the antiepileptic drugs "PVC" (Phenytoin, Valproate, Carbamazepine; imagine a PVC pipe dripping Na+ out) inhibit spread of electrical signals by prolonging inactivation state of Na+ channels III. Na+ channels in sensory nerve fibers =cationic form of local anesthetic drugs (coCAINE, proCAINE, lidoCAINE) block Na+ conductance by binding site in channel on axoplasmic side (inside cell) *Na+ channels near CTZ (Chemotactic Trigger Zone) induce vomiting; -blocked by ondansetron (and other "--setron" drugs) |
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ketamine
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blocks NMDA receptors (Glutamate's receptor) coupled to Ca++ channels
==>Ca++ channels do not open ==>no depol ==>thus Ketamine's hallucinations (only in adults, not kids; thus, good to use in KIDS=KETamine) & Dissociative Anesthesia (Produces cataleptic trance-like state (pt may appear awake w/ eyes open)) |
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phencyclidine
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"angel dust"
-works the same as Ketamine: blocks NMDA receptors (Glutamate Receptor) coupled to Ca++ receptors ==>Ca channels do not open ==>no depol ==>thus hallucinations & "dissociative anesthesia" (=cataleptic trance-like state; pt may appear awake w/ eyes open) |
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felbamate
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-works the same as Ketamine:
blocks NMDA receptors (Glutamate Receptor) coupled to Ca++ receptors ==>Ca channels do not open ==>no depol |
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Tx neuroleptic malignant syndrome
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DOC=dantrolene
MOA: blocks internal Ca++ channels of SR ==>prevents release of "trigger" Ca++ |
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Tx anesthesia-induced malignant hyperthermia (hyperpyrexia)
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Tx: dantrolene sodium
MOA: blocks internal Ca++ channels of SR ==>prevents release of "trigger" Ca++ |
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sulfonylureas
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=oral active hypoglycemics
*tolbutAMIDE *chlorpropAMIDE *glypizide MOA: inhibits K+ channels ==>depolarization ==>Ca++ flows in ==>activates PLC ==>incr IP3 ==>release more Ca++ from SR ==>secrete insulin diazoxide opens ATP-regulated K+ channels ==>prevent depolarization and insulin secretion furosemide and thiazides also inhibit insulin secretion (mechanism unknown) |
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what GABA receptors coupled to?
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GABA-A reeptors are coupled to Cl- channels (inhibitory: Cl- flows in==>cell less positive and thus hyperpolarized);
GABA-B receptors are coupled to K+ channels (inhibitory: K+ flows out==>cell less positive and thus hyperpolarized) |
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baclofen
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Tx: spasticity assoc w/cerebral palsy, MS, and stroke
MOA: baclofen is an agonist for GABA-mediated K+ channels in CNS ==>decr release of excitatory glutamate in s.c. "BACK OFF! Don't be so spastic!" (BACLOFen) |
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drugs that act at GABA-A receptors
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All the following enhance GABA's effects:
*incr FREQ of opening of GABA channels: -ethanol -propanol -volatile anesthetic agents -BZ *incr DURATION of opening of GABA channels: -Barbiturates ("Barbie is the girl who will never leave the party (incr duration)") *Valproate incr GABA via -incr glutamic acid dehydrogenase -inhibiting GABA transaminase *GABApentin releases GABA from its neurons |
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glycine receptors
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*Glycine receptors on Renshaw cells (spinal motorneurons) INHIBT alpha-motor neuron
*strychnine blocks glycine receptors ==>no alpha-motor neuron inhibition ==>convulsions |
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D1-R do what?
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vd in kidney
*blocked by D1-D2-R blockers like haloperidol |
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H2-R do what?
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-relax VSM (driect & via NO)==>vd
-incr secretion from oxynitic cells |
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PGI2-R
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(PGI2=Prostcyclin)
-relax VSM==>vd ==>decr platelet agg (Goljan) |
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PGE-R
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(PGE=Prostaglandin)
-relax VSM==>vd ==>decr platelet agg (Goljan) |
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V2-AVP-R
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*in renal CD
*AVP (ADH) absorb water Inhibited by: -ANF -PGE2 -Lithium -Demeclocycline (Tx SIADH) Stimulated by: -chlorpropramide (Tx T2DM) -carbamazepine |
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5-HT1-R
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relax VSM==>sustained vd
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what does Li+ do re Ca++?
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Li++ inhibits recycling of PIP2
==>interrupts IP3 pathway ==>IP3 does not release Ca++ from SR ==>no SmM contraction |
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digoxin
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Nl heart functioning:
I. Depolarization allows Ca++ to move into the cell via L-type (voltage-sensitive) Ca++ Channels→Now ↑[Ca++] inside cell II. After depol is over, now you want to ↓ [Ca++] inside the cell: 1. Some of the Ca++ is pumped into the SR. 2. Additional Ca++ is extruded (sqeezed out, like toothpaste out of a toothpaste tube) by a Na+- Ca++ antiporter (exchanger) which uses the high outside/low inside Na+ gradient to move Ca++ out against its concentration gradient. This outside/inside Na+- gradient is maintained by the membrane Na+- K+ ATPase. ***Digoxin partially blocks the Na+- K+ ATPase →the outside/inside Na gradient is decreased →less Ca++ is extruded via Na+- Ca++ exchange →excess Ca++ inside the cell is stored in the SR →the next depolariaztion results in a greater release of Ca++ from the SR |
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glucorticoids
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-incr transcription for lipocortin (inhibits PLA2), the inhibitor of NF-kappa-B (inflammatory cmpd) & enzymes for gluconeogenesis
-decr transcription of: COX-2 IL-1 IL-6 gene for NF-kapa-B enzymes for glycogen storage (except glycogen synthetase) |
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cyclosporine
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immunosuppressant
decr transcription of gene for IL-2 in helper T cells |
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androgens
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-increase erythropoiesis
-incr hepatic syntehsis of C1-esterase inhibitor of complement |
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estrogen increase the synthesis of what?
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-TBG (Thyroid Binding Globulin)
-CBG (Cortisol Binding Globulin) -transferrin (iron-binding protein) -angiotensinogen (renin substrate) -fibrinogen -clotting factors 2,7,9,10 |
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malignant hyperthermia
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AKA hyperpyremia
-genetic defect prevents Ca++ from being sequestered correctly into SR ==>volatile anesthetic agent (i.e. halothane) + succinylcholine causes massive release of Ca++ ==>incr BP, HR, cardiac arythmias, lactic acidosis, hyperthermia (the only Sx that's the same in neuroleptic malignant syndrome) Tx: Dantrolene sodium (prevents release of Ca++ from SR) |
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neuroleptic malignant syndrome
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NOT related to malignant hyperthermia
-neuroleptics (=antipsychotics=DA antagonists, i.e. haloperidol) block DA receptors==> Sx ~Park Dz (DA deficiency)w/catatonia: -EPS -stupor -hyperthermia (the only Sx that's the same as in malignant hypthermia) -incr CPK (indicates damaged SkM) -myoglobinuria -ARF Tx w/dantrolene sodium + bromocriptine (D2-R agonist) |