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Antianginal Antianginal AgentsAgents
Dr.Shadi-SarahroodiDr.Shadi-Sarahroodi
Pharm.D & PhDPharm.D & PhD
Qom University of Medical sciencesQom University of Medical sciences
When the supply of oxygen and When the supply of oxygen and nutrients in the blood is nutrients in the blood is insufficient to meet the demands insufficient to meet the demands of the heart, the heart muscle of the heart, the heart muscle achesaches..
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Types of AnginaTypes of Angina
Atherosclerotic angina Atherosclerotic angina (also called classic or effort angina)(also called classic or effort angina)
Vasospastic anginaVasospastic angina(also called Prinzmetal’s or variant angina)(also called Prinzmetal’s or variant angina)
Unstable anginaUnstable angina(also called preinfarction or crescendo (also called preinfarction or crescendo angina)angina)
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Antianginal Agents:Antianginal Agents:
Therapeutic ObjectivesTherapeutic Objectives Increase blood flow to ischemic heart muscleIncrease blood flow to ischemic heart muscle
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intracellular conversion to nitrite ions, and then to intracellular conversion to nitrite ions, and then to nitric oxidenitric oxide
activates guanylate cyclase activates guanylate cyclase and increases the and increases the cells' cyclic guanosine monophosphate cells' cyclic guanosine monophosphate (cGMP).(cGMP).
Elevated cGMP ultimately leads to Elevated cGMP ultimately leads to dephosphorylation of the myosin light chaindephosphorylation of the myosin light chain, , resulting in vascular resulting in vascular smooth muscle relaxationsmooth muscle relaxation
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Organic NitratesOrganic Nitrates
Ferid Murad
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NitroglycerinNitroglycerin Prototypical nitratePrototypical nitrate Large first-pass effect with PO formsLarge first-pass effect with PO forms Used for symptomatic treatment of ischemic Used for symptomatic treatment of ischemic
heart conditions (angina)heart conditions (angina) IV form used for BP control in perioperative IV form used for BP control in perioperative
hypertension, treatment of CHF, ischemic hypertension, treatment of CHF, ischemic pain, pain, and pulmonary edema associated with acute and pulmonary edema associated with acute MIMI
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– Usually diminish in intensity and Usually diminish in intensity and frequency with continued usefrequency with continued use
Tachycardia, postural hypotensionTachycardia, postural hypotension Tolerance may developTolerance may develop facial flushing, and tachycardiafacial flushing, and tachycardia
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ToleranceTolerance
blood vessels become blood vessels become desensitizeddesensitized to vasodilationto vasodilation
daily daily “nitrate-free interval”“nitrate-free interval” typically typically 10 to 12 hours10 to 12 hours, usually at , usually at
nightnight, because demand on the , because demand on the heart is decreased at that timeheart is decreased at that time
variant angina worsens early in the morning, variant angina worsens early in the morning, perhaps due to circadian catecholamine surgesperhaps due to circadian catecholamine surges
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Mechanism of ActionMechanism of Action Decrease the HRDecrease the HR, resulting in decreased , resulting in decreased
myocardial oxygen demand and increased myocardial oxygen demand and increased oxygen delivery to the heartoxygen delivery to the heart
Decrease myocardial contractilityDecrease myocardial contractility, helping to , helping to conserve energy or decrease demandconserve energy or decrease demand
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Propranolol is the prototype: not Propranolol is the prototype: not cardioselectivecardioselective
metoprolol or atenolol, are metoprolol or atenolol, are preferredpreferred
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All β-blockers are nonselective at All β-blockers are nonselective at high doses and can inhibit βhigh doses and can inhibit β22 receptors.receptors.
Important in asthmatics.Important in asthmatics.
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Do not discontinue β-blocker therapy Do not discontinue β-blocker therapy abruptlyabruptly. .
The dose should be gradually tapered The dose should be gradually tapered off over off over 5 to 10 days 5 to 10 days to avoid to avoid rebound angina rebound angina or or hypertensionhypertension.].]
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Mechanism of ActionMechanism of Action
Calcium influx is increased Calcium influx is increased in in ischemia because of the membrane ischemia because of the membrane depolarization that hypoxia depolarization that hypoxia producesproduces
In turn, this promotes the activity of In turn, this promotes the activity of several adenosine triphosphate–several adenosine triphosphate–consuming enzymes, thereby consuming enzymes, thereby depleting energy stores and depleting energy stores and worsening the ischemiaworsening the ischemia
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NifedipineNifedipine
a dihydropyridine derivativea dihydropyridine derivative arteriolar vasodilatorarteriolar vasodilator OralOral Usually: extended-release tablets.Usually: extended-release tablets. Hepatic metabolismHepatic metabolism Eliminate in both urine and the Eliminate in both urine and the
fecesfeces
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Side EffectsSide Effects
FlushingFlushing HeadacheHeadache HypotensionHypotension peripheral edema as peripheral edema as all all calcium-channel blockerscalcium-channel blockers are are
with with constipationconstipation is a problem is a problem
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VerapamilVerapamil
Slows AV conductionSlows AV conduction decreases heart rate, contractility, decreases heart rate, contractility,
blood pressure, and oxygen demandblood pressure, and oxygen demand contraindicatedcontraindicated in patients with in patients with
preexisting depressed cardiac preexisting depressed cardiac function or AV conduction function or AV conduction abnormalitiesabnormalities
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DiltiazemDiltiazem
slow AV conductionslow AV conduction decrease the rate of firing of the decrease the rate of firing of the
sinus node pacemakersinus node pacemaker metabolized by the livermetabolized by the liver
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