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N550 Pharm > Dyslipidemia, anticoagulants > Flashcards

Dyslipidemia, anticoagulants Flashcards

0
Q

What might you find on a physical exam of someone with hyperlipidemia?

A

Xanthelasma: fatty deposits on hands, arm, face
Circumferential arcus: white ring around eyelid/iris (fat)
PVD: shiny extremities, discoloration of skin, hairlessness
Thickened achilles
HTN

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1
Q

What does cholesterol produce?

A

Cell Membranes, bile acids, steroid hormones

Lipoproteins = triglycerides + cholesterol

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2
Q

If fasting, which lab results do you look at to determine if someone has hyperlipidemia, if they don’t fast which lab results do you look at?

A

Fasting: Total cholesterol, LDL, HDL, TAGs
Not fasting: total and HDL
If total is more than 200 mg/dl or HDL less than 40, test again with fasting

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3
Q

What total cholesterol levels are desirable vs. borderline vs. high?

A

Desirable: less than 200 mg/dl
Borderline: 200-239
High: over 240

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4
Q

What levels of HDL are considered high vs. low?

A

High: over 60
Low: under 40

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5
Q

What levels of LDL are considered optimal, near optimal, borderline high, high, and very high?

A 
Optimal: less than 100
Near optimal 100-129
Borderline high: 130-159
High: 160-189
Very high: over 190
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6
Q

What is primary hyperlipidemia?

A

Genetic heterozygous condition resulting in elevated total cholesterol (over 200) or triglycerides (over 500)
These patients are prone to pancreatitis

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7
Q

What is secondary hyperlipidemia?

A

Hyperlipidemia caused by diseases or drugs
Diabetes, hypothyroid, obstructive liver disease, chronic renal failure, alcohol, HIV/AIDS, obesity
Drugs: progestins, corticosteroids, anabolic steroids

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8
Q

Who is screened for hyperlipidemia? How often? What tests are done?

A 
Adults over 20
Every 4-6 years
Fasting lipoprotein profile: total cholesterol, LDL, HDL, triglycerides
ALT, DK, HbA1c
Estimated 10 year ASCVD risk
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9
Q

What do the newest guidelines from the ACC/AHA focus on regarding hyperlipidemia?

A

Lower cholesterol by improving overall health as number one focus, if that doesn’t work then add medication

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10
Q

What factors elevate and lower HDL?

A

Elevate: alcohol, saturated fats, weight loss
Lower: low fat diet, sugar, excess calories, polyunsaturated fats

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11
Q

What factors elevate and lower LDL?

A

Elevate: saturated fat, trans fatty acids, dietary cholesterol
Lower: MUFAs, complex carbs, and soy

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12
Q

What factors elevate and lower cholesterol?

A

Elevate: saturated fats, trans-fatty acids
Lower: substituting MUFAs and complex carbs for saturated fats, soy

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13
Q

What factors elevate and lower triglycerides?

A

Elevate: alcohol, sugar, high carb diet, excess calories
Lower: weight loss, fish oils

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14
Q

What are the 4 categories established indicating statin therapy for secondary prevention of ASCVD?

A
  1. Clinical ASCVD
  2. LDL over 190
  3. Diabetes
  4. Over 7.5% estimated 10-year ASCVD risk
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15
Q

How do HMG-CoA Reductase Inhibitors work? (AKA statins)

A

Inhibit the rate-limiting enzyme in the formation of cholesterol
Interrupts the process that the body is storing fats
Effect is to decrease LDLs, decrease TGs, and increase HDLs

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16
Q

For someone with clinical ASCVD, at what age should they receive high vs. moderate-intensity statins?

A

75 or older = high intensity statins

Under 75 = moderate intensity statins

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17
Q

What are bile acid sequestrants? Name a few

A

Work by binding bile acids in the intestine, resuting in the liver using hepatic cholesterol to producce more bile acids
Effect is to decrease LDLs and increase HDLs
Cholestyramine (Questran), Colestipol, Colesevelam
Note: these make the patient have oily poops

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18
Q

How does nicotinic acid (niaspan, niacin) work?

A

Reduces the production of VLDLs
Effect is to reduce LDLs, TGs, and increase HDLs
Note: it causes flushing, sweating

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19
Q

How do fibric acid derivatives work? Name a few

A

Fibrates reduce the synthesis and increase the breakdown of VLDLs
Effect is to reduce LDLs, decrease TGs, and increase HDLs
Gemibrozil (lopid), fenofibrate, clofibrate

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20
Q

How does eztimibe (zetia) work?

A

Works by inhibiting cholesterol and phytosterol absorption from the brush border of the intestines
No effect on fat soluble vitamins (A,D,E,K)
No effect on CYP450
Used in combination with a statin
Not used as often because of coronary side effects

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21
Q

What can happen with patients taking statins and fibric acids together?

A

Increased risk of myopathy

Contraindicated with severe hepatic disease

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22
Q

What can happen with patients taking statin and niacin?

A

Increased risk of hepatic dysfunction

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23
Q

Name some drug interactions with lovastatin and simvastatin

A 
Intraconazole (sporanox)
Ketoconazole (nizoral)
Erythromycin
Clarithromycin (biaxin)
Gemfibrozin
Grapefuit juice
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24
Who is at greater risk of myopathy?
Age over 80 Small body frame and frail Impaired renal/hepatic system Alcohol abuse
25
What drugs combined with statins increase risk of myopathy?
``` Niacin Gemfibrozil Cyclosporin HIV protease inhibitors Verapamil Amiodarone ```
26
What drugs should pregnant and nursing women avoid related to hyperlipidemia? What is the only safe drug they can take?
``` Statins Ezetimibe Niacin Fibric acid derivatives Bile acid-binding resins are the only safe drugs during pregnancy (oily poop drugs!) ```
27
How quickly does primary hemostasis start working?
Occurs immediately (seconds-minutes) in response to a vessel injury that results in a "platelet plug"
28
How does primary hemostasis work?
Exposed subendothelial collagen attracts circulating platelets, which then adhere to each other. These platelets adhere, degranulate, and aggregate Promoted by a group of pro-coagulants (von willebrand factor, clotting factor VIII, ADP), causes localized vasoconstriction
29
How do platelets activate, degranulate and aggregate in primary hemostasis?
Adhered platelets activate and change shape forming pseudopods (like an "arm" that grabs platelet to form a platelet plug) and release thromboxane A2 Platelets degranulate, releasing a variety of biochemicals. Aggregation begins, using fibrinogen and vWF and a connecting agent
30
What agents are released during degranulation?
Serotonin, histamine (vasoconstrict) Thromboxane (vasoconstrict, degranulate platelets) ADP (makes plasma membrane sticky, degranulates platelets) Clotting factors Va, VIIIa, IXa Platelet factor 4 (heparin neutralizing factor, enhances clot formation)
31
What is secondary hemostasis?
Takes minutes to hours and results in fibrin clot formation The fibrin clot is a meshwork of protein that acts as a net to collect other cells and stabilize the platelet plug. Then the net retracts and fibrin strands shorten to trap the platelets. Each clotting factor is converted to its active form until fibrin ends the coagulation cascasde
32
Once the coagulation process is activated, what natural anticoagulants regulate this process?
``` Prostacyclin Antithrombin III Heparin Protein C Protein S ```
33
What mediates lysis in the fibrinolytic system?
Plasmin, activated by coagulation and inflammation substances Plasmin splits fibrin and fibrinogen into fibrin degradation products
34
Name some oral and IV antiplatelet medications
Oral: aspirin, ticlopidine, clopidogrel (plavix), prasugrel, ticagrelor IV: abciximab, eptifibatide, tirofiban
35
What is aspirin? What is the normal dosage?
COX inhibitor, prevents production of thromboxane A The action is irreversible, lifespan of a platelet is 10 days Dosage 81-325 mg every day
36
Aspirin precautions?
Children (reye's) Pregnancy CV (blunts effect of ACEI, b-blockers, diuretics due to prostaglandin inhibition) Asthmatics (increased leukotrienes which increase bronchoconstriction Increased bleeding with other anticoagulants (treat with platelet transfusion)
37
What class ticlopidine (ticlid) and clopidogrel (plavix)? How do they work and why are they used?
Thienopyridine that blocks ADP receptor on platelet and inhibits fibrinogen from binding Used for prevention of ischemic events (for patients with aspirin intolerance) Plavix is also used in combination with aspirin
38
Why is hardly anyone on ticlipidine (ticlid) anymore?
``` Risk for... Neutropenia TTP GI upset Teratogenesis ```
39
Clopidogrel (plavix) precautions?
Metabolized by CYP2C19, genetic predisposition to poor metabolism along this pathway, may require increased dosing CP450 inhibitor Dose adjustment for renal/hepatic disease
40
What is prasugrel (effient)? How does it compare to clopidogrel?
New thienopyridine that has greater prevention of platelet aggregation than clopidogrel but more fatal events and higher risk of bleeding during CV surgery
41
What is ticagrelor (brilinta) and how does it compare to clopidogrel?
Allosteric antagonist, blocks ADP receptors from a different binding site Reduces death rates after MI more than clopidogrel BUT, there is a higher rate of non-procedure related bleeding and higher incidence of fatal intracranial hemorrhage compared to clopidogrel Used in combo therapy with ASA, precaution: hepatic dysfunction
42
What are GPIIb/IIIKa inhibitors? What are they used for? Name a few
Block the GPIIb/IIIa receptor, preventing fibrinogen binding Used for acute coronary syndrome and PCI Abciximab (ReoPro), eptifibatate (integrillin), tirofiban (agrastat)
43
Why would you use Abciximab vs eptifibatide? How would you treat bleeding?
Abciximab for ACS with planned PCI, most prolonged effects Eptifibatide for the same thing, dosage based on serum creatinine (decreased dosage for creatinine 2-4) For bleeding, reverse with platelets if they are on abciximab, just discontinue the drug if they are on eptifibatide or tirofiban
44
When are antiplatelets stopped before surgery and restarted?
7-10 days before surgery, resume 24 hours after surgery Clopidogrel should be stopped 5 days before surgery Patients at high risk for cardiac events should not discontinue
45
How does heparin work? What are the uses?
It is a heterogenous mixture of polysaccharide chains Activates Antithrombin III which increases inhibition of Thrombin IIa and Factor Xa by 1000-fold Uses: DVT/PE tx, DVT prophylaxis, ACS, warfarin contraindicated
46
True/False: Heparin has an inability to inhibit clot-bound thrombin.
TRUE, this is a major drawback of heparin use
47
When heparin causes bleeding, what is the reversal?
Protamine 1 mg/ 100 units of heparin given OR 50mg bolus of protamine
48
Type 1 vs. Type 2 HIT
Type 1: non-immune mediated, benign, mild drop in platelets, usually within 4 days of heparin tx, NOT associated with thrombosis Type 2: immune mediated, starts 5-14 days of heparin tx, reduction in platelets less than 150k or decrease by 50% of baseline
49
What is HITT? 10-25% of cases 25-30% mortality
Thrombocytopenia with thromboembolism Venous (more common): DVT, PE, gangrene, dural sinus thrombosis Arterial: cerebral infarction, limb ischemia, skin necrosis, MI, gut, renal, adrenal infarction
50
What lab tests help diagnose HIT?
``` ELISA assay (measures titer of IgG to heparin) C-serotonin release assay (detects platelet activation, not readily available) ```
51
HIT treatment?
Don't delay treatment waiting for labs!! | Stop heparin and start argatroban (or another non-heparin anticoagulant)
52
How does a low molecular weight heparin (enoxaparin/lovenox) work? What is it used for?
Binds with Antithrombin III and inhibits factor Xa | Uses: DVT prophylaxis (40mg qd), ACS (1mg/kg q12h), VTE tx
53
LMWH precautions? (exoxaparin/lovenox)
Pregnant women (monitor anti-Xa levels) Obese pt (needs weight based) NOT recommended for renal insufficiency Spine surgery pt or epidural
54
Fondaparinux (arixtra): class of drug, how does it work, what are the uses?
Synthetic factor Xa inhibitor Binds with anti-thrombin III to potentiate Xa inhibition (no effect on IIa) Uses: ACS, PE/DVT tx, DVT prophylaxis (7.5 mg)
55
What are argatroban and lepirudin used for? What is bivalirudin used for? What class are these drugs?
IV direct thrombin IIa inhibitors Argatroban and lepirudin for HIT Bivalirudin for PCI Note lepirudin ad desirudin can only be used once due to anaphylaxis issues
56
IV direct thrombin IIa inhibitors interactions? Treatment of bleeding?
Interactions: increased bleeding with anticoagulants, thrombolytics, antiplatelets Treatment of bleeding: stop infusion, can give Factor VII, FFP, and cryoprecipitate
57
How does warfarin work? What is it used for?
Interferes with production of Vitamin K-dependent clotting factors (II, VII, IX, X) and interferes with carboxylation of natural anticoagulants (Protein C and S) Uses: prevention clot/embolis with DVT, Afib, and mechanical heart valves, long term tx of VTE
58
Warfarin dosing is based on ____ (lab value). Start with 5-10 mg/day. Overlap with heparin/LMWH for ___ days
INR Therapeutic INR is 2-3 Overlap for 1-2 days
59
List warfarin adverse effects and interactions
Adverse effects: Bleeding, birth defects, cutaneous necrosis. Use caution in NSAIDs and antiplatelets Interactions: Increases effect of amiodarone, cimetidine, acetaminophen, and phenylbutazone. Decreases effect of sucralfate, cholestyramine, spironolactone, barbituates, and Vit K foods
60
Reversal/treatment of bleeding with warfarin therapy?
Vitamin K FFP Note: FFP's INR is 1.5 so it can't help more than that
61
If warfarin is d/c for surgery, how long before surgery is it d/c and how long post-op until it is resumed?
5 days before surgery d/c 12-24 hours post-op resume Bridging with heparin up until 4 hours of surgery is a possibility too
62
Dabigatran (pradaxa): drug class, uses?
Direct thrombin inhibitor IIa (new oral anticoagulants) | Uses: prevents stroke for Afib and treats DVT/PE
63
Dabigatran (pradaxa) advantages and disadvantages?
Adv: no routine monitoring, predictable pharmacokinetics, less diet/drug interactions, rapid peak (1 hr), short half-life (12 hrs) Disadv: high cost, bid dosing, no antidote, no assay for monitoring effect, no long term data
64
Rivaroxaban (xarelto): class, use?
Class: direct factor Xa inhibitor Use: stroke/embolism prevention in Afib, prevents DVT, treats PE/DVP
65
Rivaroxaban (xarelto): advantages/disadvantages?
Adv: no routine, monitoring predictable pharmacokinetics, less diet/drug interactions, rapid peak (2.5-4h), short half-life (7-11h) Disadv: high cost, no antidote, no assay, no long term data
66
Apixaban (eliquis): class, use?
Class: direct factor Xa inhibitor Use: stroke/embolism prevention in Afib, prevent DVT, tx DVT/PE
67
Apixaban (eliquis): advantages/disadvantages?
Adv: no routine monitoring, predicable pharmacokinetics, less diet/drug interactions, rapid peak (3h), short half-life (12h) Disadv: high cost, bid dose, no assay, no long term data, reversed ONLY with prothrombin complex concentrate
68
How do fibrinolytics work? Name some.
Plasminogen activators convert plasminogen to plasmin Plasmin causes fibrinolysis Streptokinase, urokinase, tPA, recombinant tPA (alteplase, reteplase), tenecteplase (TNK-ase)
69
Fibrinolytic uses?
Acute STEMI Acute ischemic stroke Urokinase used for CVC de-clotting and PE
70
Fibrinolytic absolute contraindications?
Previous hemorrhagic stroke Ischemic stroke within 3 mo Intracranial neoplasm Active internal bleeding Aortic dissection (CXR r/o wide mediastinum) Significant head/facial trauma within 3 mo
71
Fibrinolytic relative contraindications?
``` Uncontrolled HTN (180/110) Severe chronic HTN Current use of anticoagulants (INR over 2.5) Bleeding disorder Non-compressible vascular puncture ```
72
What statins are indicated for low, moderate, and high intensity statin therapy?
HIGH: Atorvastain 80mg, rosuvastatin 20mg MODERATE: atorvastatin 40, rosuvastain 10, simvastatin 20-40, pravastatin 40, lovastatin 40, fluvastatin 40, pitavastatin 2-4 LOW: pravastatin 10-20, lovastatin 20, simvastatin 10, fluvastatin 20-40, pitavastatin 1

N550 Pharm (14 decks)

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