Antianginals Flashcards
What are the nitrates?
Nitroglycerin, Isosorbide Dinitrate, Amyl Nitrite
What is the MOA of Nitroglycerine?
Rapidly actin; sublingual; high first pass effect; spray; can be given as patch or ointment for prolonged action (prophylaxis)
When would you use Nitroglycerine?
Stable, variant, and unstable angina; used sublingually for acute and topical and SR for long-term
What are the side effects of Nitroglycerine?
Excessive vasodilation (decrease BP), headache, reflex tachycardia, dizziness (orthostatic hypotension), flushing, throbbing headache (meningeal artery dilation), severe hypotension when mixed with ED drugs; can have tolerance/rebound effect
What is the MOA of Isosorbide Dinitrate?
Rapidly acting; sublingual; can be given orally or topically for prolonged action (prophylaxis)
When would you use Isosorbide Dinitrate?
Stable, variant, and unstable Angina; acute attacks (sublingual prep)
What are the side effects of Isosorbide Dinitrate?
Excessive vasodilation (decrease of BP), headache, reflex tachycardia, dizziness (orthostatic hypotension), flushing, throbbing headache (meningeal artery dilation), hypotension when mixed with ED drugs; can have tolerance/rebound effect
What is the MOA of Amyl Nitrite?
Convert to NO > Vasodilation (veins affected more than arteries); inhalation
When would you use Amyl Nitrite?
Stable, variant, and unstable Angina; acute attacks (sublingual prep)
What are the side effects of Amyl Nitrite?
Excessive vasodilation (decrease of BP), headache, reflex tachycardia, dizziness (orthostatic hypotension), flushing, throbbing headache (meningeal artery dilation), hypotension when mixed with ED drugs; can have tolerance/rebound effect
What are the Ca channel blockers?
Verapamil, Diltiazem, Nifedipine, Amlodipine, Nicardipine
What is the MOA of Verapamil?
Block L-type Ca channels, preventing Ca influx > decreased arteriolar tone (decreased afterload), cardiac depression (decreases HR and contractility) > less O2 requirement
When would you use verapamil?
Stable and variant angina to relieve chest pain; fast atrial/nodal arrhythmias to slow HR/AV conduction
What are the side effects of verapamil?
High doses/toxicity may cause CHF; constipation, flushing, dizziness; AV blockade, sinus node depression
What is the MOA of Diltiazem?
Block L-type Ca channels, preventing Ca influx > decreased arteriolar tone (decreased afterload), cardiac nodal and muscle cells; decreases HR, AV conduction , myocardial contractility better than Verapamil
When would you use Diltiazem?
Stable and variant angina; posses both cardiac and vasodilator activity
What are the side effects of Diltiazem?
Excessive dilation (decrease of BP) > reflexive tachycardia, dizziness (orthostatic hypotension), flushing, throbbing headache (meningeal artery dilation); potential severe hypotension with erectile dysfunction treatment (sildenafil, etc.)
What is the MOA of Nifedipine?
Dihydropyridine; Block L-type Ca channels, preventing Ca influx > decreased arteriolar tone (decreased afterload) in vascular smooth muscle, cardiac nodal and muscle cells; causes arteriolar dilation and less cardiac depression
When would you use Nifedipine?
Stable angina esp. vasospastic angina (Prinzmetal’s)
What are the side effects of Nifedipine?
Avoid short-acting agents; excessive vasodilation > reflex tachycardia, nausea, lightheadedness, dizziness, headache, peripheral edema