Anti-Anginal Flashcards
Nitroglycerin and Isosorbide are what class of drugs?
Nitrates & Nitrites
MOA for Nitrates, Nitrites?
Vasodilation via NO –> cGMP –> uneven vasodilation (veins > arterioles) –> decreased preload > afterload
DOC for any acute anginal attack?
Nitroglycerin and Isosorbide.
Decreased myocardial O2 requirements
T or F: nitrates relax all smooth muscles?
TRUE
Why is sublingual the preferred form of Nitrates?
Avoids hepatic destruction (due to high first pass metabolism), rapid absorption, immediate relief
Adverse effects of Nitrates/Nitrites?
Throbbing HA (vasodilation in brain) Tachycardia, Orthostatic hypotension
IF you take nitro often, what will happen?
Tolerance or marked reduction to drugs effects
T or F: Calcium channel blockers relax all smooth muscles that depend on calcium for normal resting tone and contraction?
TRUE
Verapamil, Diltiazem, and Nifedipine are what drug class?
Ca Chanel Blockers
Verapil has greater effect on vascular smooth muscle or cardiac muscle?
Cardiac muscle (depress SA/AV nodes)
Niedipine has greater effect on vascular smooth muscle or cardiac muscle?
Vascular smooth muscle (cause vasodilation and reflex tachycardia)
Why is Nifedipine indicated only in HTN, not angina?
May provoke angina attacks
What anti-anginal class is better for chronic angina tx and not immediate angina relief?
Ca Channel Blockers
What Ca channel blocker will have equal effects on vascular smooth muscle, cardiac muscle, vasodilation, reflex tachycardia, depression of SA/AV node function
Diltiazem
Nifedipine can lead to what harmful effect?
Increased development of MI
rapid hypotension –> baroreflex –> increased cardiac workload –> ischmia
Verapamil and diltiazem can lead to what harmful effect?
Serious cardiac depression (from SA/AV node depression)
B-blockers have 3 CV effects on what 3 organs?
- Heart (decrease CO)
- Kidneys (decrease renin)
- CNS (decrease sympathetic vasomotor tone