Reduces striated muscle contractions and blocks peripheral neuromuscular transmission by reducing acetylcholinesterase release at the myoneural junction; manages seizures in toxemia of pregnancy; induces uterine relaxation; can cause bronchodilation after beta agonists and anticholinergics have been used.
Card 242
Question
MANNITOL 20% MOA
Answer
Promotes the movement of fluid form the intracellular space to the extracellular space. Decreases cerebral edema and intracranial pressure. Promotes urinary excretion of toxins.
Card 243
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MEPERIDINE (Demerol) MOA
Answer
Synthetic opioid agonist that acts on opioid receptors to produce analgesia, euphoria, respiratory and physical depression; a schedule II drug with potential for physical dependency and abuse.
Card 244
Question
METOPROLOL (Lopressor) MOA
Answer
Selective inhibitor of beta1-adrenergic receptors; completely blocks beta1 receptors, with little or no effect on beta 2 receptors at doses <100 mg;
Card 245
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MIDAZOLAM (Versed) MOA
Answer
Increased production of GABA, an inhibitory neurotransmitter, causing procedural amnesia; anesthesia; skeletal muscle relaxation. Anxiolytic and sedative / hypnotic properties similar to other benzodiazepines.
Card 246
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MORPHINE SULFATE MOA
Answer
Alleviates pain through CNS actions Suppresses fear and anxiety centers in brain. Depresses brain stem respiratory centers. Decreases preload and afterload, decreasing myocardial oxygen demand.
Card 247
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NALOXONE (Narcan) MOA
Answer
Competitive inhibition at narcotic receptor sites. Reverse respiratory depression secondary to depressant drugs. Completely inhibits the effect of morphine.
Card 248
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NITROGLYCERIN MOA
Answer
Smooth muscle relaxant with dilation of arterioles and veins in the periphery, reduces preload and afterload, decreases the workload of the heart and, thereby, myocardial oxygen demand.
Card 249
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NITROPASTE MOA
Answer
Smooth muscle relaxant acting on vascular, bronchial, uterine and intestinal smooth muscle. Dilation of arterioles and veins in the periphery reduces preload and afterload, decreases the workload of the heart and, thereby, myocardial oxygen demand.
Card 250
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NOREPINEPHRINE (Levophed) MOA
Answer
Potent alpha-agonist resulting in intense peripheral vasoconstriction, positive chronotropic and increased inotropic effect with increased cardiac output. Alpha adrenergic activity resulting in peripheral vasoconstriction and beta-adrenergic activity leading to inotropic stimulation of the heart and coronary artery vasodilation.
Card 251
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ONDANSETRON (Zofran) MOA
Answer
Selective 5-HT receptor antagonist, blocking serotonin, both peripherally on vagal nerve terminals and centrally in the CNS chemoreceptor trigger zone
Card 252
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OXYGEN MOA
Answer
Reverses hypoxemia.
Card 253
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PANCURONIUM (Pavulon) MOA
Answer
Pancuronium produces complete muscular relaxation by binding to the receptor for acetylcholine at the neuromuscular junction, without initiating depolarization of the muscle membrane. As the concentration of acetylcholine rises in the neuromuscular junction, Pancuronium is displaced and muscle tone is regained.
Card 254
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PRALIDOXIME CHLORIDE (2-PAM, Protopam) MOA
Answer
Reactivation of cholinesterase to effectively act as an antidote to organophosphate pesticide poisoning. This action allows for destruction of accumulated acetylcholine at the neuromuscular junction.
Card 255
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PROCAINAMIDE (Pronestyl) MOA
Answer
Suppresses phase IV depolarization in normal ventricular muscle and Purkinje fibers, reducing automaticity of ectopic pacemakers; suppresses reentry dysrhythmias by slowing intraventricular conduction.
Card 256
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PROMETHAZINE (Phenergan) MOA
Answer
H receptor antagonist that blocks the actions of histamines by competitive antagonism at the H receptor. In addition to antihistamine effects, promethazine also possesses sedative, anti-motion, antiemetic, and considerable anticholinergic activity.
Card 257
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RACEMIC EPINEPHRINE MOA
Answer
Stimulates alpha-1 receptors reducing subglottic edema in croup by mucosal vascular bed vasoconstriction. Stimulates beta-2 receptors in the smaller airways in lungs causing bronchodilation with relaxation of bronchial smooth muscles. Reduces airway resistance. Useful in treating laryngeal edema; inhibits histamine release.
Card 258
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ROCURONIUM (Zemuron) MOA
Answer
Rocuronium produces complete muscular relaxation by binding to the receptor for acetylcholine at the neuromuscular junction, without initiating depolarization of the muscle membrane. As the concentration of acetylcholine rises in the neuromuscular junction, Pancuronium is displaced and muscle tone is regained.
Card 259
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SODIUM BICARBONATE 8.4% MOA
Answer
Reacts with hydrogen ions to form water and carbon dioxide
Card 260
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SUCCINYLCHOLINE (Anectine) MOA
Answer
Ultra short acting depolarizing skeletal relaxant that mimics acetylcholine as it binds with the cholinergic receptors on the motor end plate, producing a phase I block as manifested by fasciculations.
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