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Pharm Unit 17,18,19

Pharmacology Exam 6

Peripheral Acting Drugs Given by IV, Action is dose dependent, Interferes with N2 receptor
Non-Depolarizing Blocker Act as anatagonist, Onset 3-5min, Duration 20-30min, often used for long-term paralysis, has antidote, frequently assess pt
Depolarizing Blocker Stimulates N2 receptor then blocks it, no antidote, short acting, can cause malignant hyperthermia, spike in potassium levels & facial twitching
Train of Four Used to assess degree of paralysis 4 twitches = <75% block 3 twitches = 90% block 2 twitches = 95% block 1 twitch = 98% block
What is Norcuron? Non-depolarizing medication, has few cardiovascular effects
What is Zemuron? non-depolarizing medication has low incidence of adverse cardiovascular effects, expensive
What is Tensilon? Used to diagnose & treat myasthenia gravis, quick onset, ultra short acting
3 medications used in maintenance Tx of myasthenia gravis Prostigmin, Eserine, Mestinon
Antidote for non-depolarizing paralytics Prostigmin
What is Pre-Load? The amount of blood volume returning to the right heart. Increase in preload = Increase in Right heart work Decrease in preload = Decrease in Right heart work
What is After-Load? Resistance to blood movement from the left ventricle at systole. Increase in SVR/Afterload = Increase in left heart work Decrease in SVR/Afterload = Decrease in Left heart work
Hypertension can result in _____ . Stroke, kidney disease, & cardiac disease *Adversely alters organ function
Morphine Sulfate Relaxes smooth muscle surrounding blood vessels w/ a resulting fall in BP, can vbe used to drop Pre & After Load in Tx of heart failure, Can cause nausea, constipation, apnea, bronchospasm, or hypotension.
Anti-hypertensive Medications Sympathetic Blocker, ACE Inhibitor (Vasotec), Thiazides, Nipride, Nitrates
Inderal (propranolol) Blocks sympathetic receptor, Beta blocker - can promote airway spasm w/ asthma, lowers BP
ACE Inhibitors Given PO for Tx of hypertension, Act by interfering w/ angiotensin II = vasoconstriction is reduced resulting in lower BP
Vasotec ACE Inhibitor used to lower BP, may cause swelling of tongue which can result in possible airway obstruction
Thiazides A class of diuretics used to lower BP because they promote the loss of sodium which results in loss of sympathetic tone & so blood vessels dilate lowering BP
Nipride (sodium nitroprusside) Rescue med used to Tx acute hypertension, IV drip, light sensitive, fast acting vasodilator, requires close pt monitoring
Nitrates Promote vasodilation by limiting the availability of Ca+, reduces pre & after load, enhances myocardium perfusion
Levophed (norepinephrine) Rescue med by IV drip, very strong acting vasoconstrictor, vasoconstriction is significant & can result in ischemia & tissue necrosis of the extremities, use of this med = dire situation
Vasopressin (pitressin) Rescue med, anti-diuretic hormone, can be used as a vasopressor med by IV drip
Dopamine Rescue med by IV drip, stimulates AlphaI receptor, requires higher doses to promote vasoconstriction
Moderate to High doses of Dopamine (intropin) Catecholamine, dose dependent Low dose <5ug/kg/min not therapeutic Moderate dose <10ug/kg/min Beta1 increases force & rate of myocardium High dose >10ug/kg/min Alpha1 vasoconstriction
Cardiac Glycosides Promotes availability of free Ca+ w/in myocardium which improves stroke volume
3 Cardiac Gylcoside medications Digitalis, Lanoxin, Digitoxin
Digitalis med from foxglove plant, high K+ reduces effect, low K+ makes it toxic
Dobutamine (dobutrex) Synthetic catecholamine, non-selective Beta agonist, Beta1 improves stroke volume, Beta2 vasodilation decreases systemic vascular resistance & can reduce BP & promote reflex tachycardia, indication is acute heart failure
Somatic Nervous System receptor & neurotransmitter Nicotinic II & Ach
Acetylcholinesterase Enzyme that terminates neuro message & allows for repolarization
Depolarization contraction
Repolarization resting state/relaxation
Indications for using nicotinic antagonists Surgery, orthopedic procedures, intubation, mechanical ventilation, paralysis
Side-effects associated with peripheral acting nicotinic antagonists Histamine release = bronchospasm Loss of sympathetic tone = hypotension Tachycardia, hypertension, arrhythmias Temp increase that is unstoppable
Compatibility of nicotinic agaonists Poor compatibility with other drugs, pentiated by some: antibiotics, antiarrhythmics, diurectics
Non-depolarizing medications Tubocurarine(tubarine), Pancuronium bromide(pavulon), Vercuronium bromide(norcuron), Rocuronium(zemuron), Gallamine(flaxedil)
Depolarizing medication Anectine(succinylcholine chloride)
Anticholinesterase medications Used in diagnosis & treatment of myasthenia gravis, potentiate Ach @ N2 receptor by inhibition of actylcholinesterase, antidote for non-depolarizing agents, promote skeletal muscle contraction
Vascular Tone Smooth muscle surrounding the blood vessel alters the size of the blood vessel
Vascular Resistance The amount of resistance to the movement of blood represents myocardium work
Ganglionic Blockers Reduce hypertension through reduction of sympathetic tone,
Problems associated with Ganglionic Blockers Loss of venous tone & resulting blood pooling in legs, Results in orthostatic hypotension, Constipation, Urinary retention
What is Shock? The absence of adequate blood pressure is profound. Death follows quickly if intervention is not swift and appropriate. Metabolic Acidosis.
What is angina pectoris? Intense chest pain secondary to lack of oxygen for the myocardium
Explain the use of calcium channel blockers Vascular smooth muscle – requires free calcium for contraction – dilating/relaxing smooth muscle, Blocks the availability of free calcium, Negative Ionotropic effect
Explain the action of Procardia Calcium channel blocker, reduces coronary artery spasm with resulting enhanced coronary perfusion
Glycosides Are a positive inotropic medication, increases intracellular Ca+ which promotes contractility, increases myocardial contraction which increases stroke volume
Two actions of Glycosides Reduces heart rate, lower AV conduction
Phosphodiesterase Inhibitors Promote higher levels of free Ca+, Acts by increasing the level of cAMP through inhibition of phosphodiesterase, Higher levels of cAMP result in greater blood levels of free Ca+, Higher free levels of Ca+ promote enhance myocardial contraction
Inamrione and Amrinone Phosphodiesterase inhibitors, used to treat severe congestive heart failure that does not respond to more conventional therapy
Created by: vgflgirl