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RxPrep > Anticoagulation > Flashcards

Anticoagulation Flashcards

1
Q

How do anticoagulants work?

A

prevent clots from forming and to keep existing clots from becoming larger; they DO NOT break down clots

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2
Q

What 3 main factors contribute to thrombosis (blood clots) forming (Virchow’s triad)?

A
  1. blood vessel (endothelial) injury
  2. blood stasis (stopping/slowing of blood flow)
  3. pro-thrombotic conditions (hypercoagulability)
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3
Q

What conditions are anticoagulants used to prevent?

A
  1. venous thromboembolism (VTE)
    –> DVT/ PE
  2. cardioembolic stroke
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4
Q

What conditions are anticoagulants used to treat?

A
  1. immediate treatment of acute coronary syndrome (ACS)
  2. venous thromboembolism (VTE)
    –> DVT/ PE
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5
Q

Where do blood clots form?

A

anywhere in the body

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6
Q

When do blood clots become dangerous?

A

when they become an embolus (a clot/ piece of clot that travels somewhere), blocking blood flow to the lungs, heart, or brain

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7
Q

Where are coagulation (clotting) factors made?

A

liver

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8
Q

Which clotting factors are vitamin K dependent?

A

II (2)
VII (7)
IX (9)
X (10)

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9
Q

At which factor do the intrinsic and extrinsic pathways meet?

A

X (10)

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10
Q

What is the outcome of clotting factor activation beginning from either pathway?

A

activate the next clotting factor in the cascade until fibrin is formed

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11
Q

What is the body’s natural, endogenous anticoagulant?

A

Antithrombin

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12
Q

Which anticoagulants inhibit the clotting cascade indirectly via antithrombin?

A
  1. Fondaparinux
  2. LMWHs
  3. UFH
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13
Q

What factors does heparin inhibit?

A

IIa (thrombin)
Xa

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14
Q

What factors do LMWHs inhibit?

A

Xa > IIa (thrombin)

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15
Q

Which medications directly inhibit factor Xa?

A
  1. apixaban (Eliquis)
  2. edoxaban (Savaysa)
  3. rivaroxaban (Xarelto)
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16
Q

What is the MOA of warfarin?

A

vitamin K antagonist; coagulation factors are still made but have reduced coagulation activity

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17
Q

What medications are DOACs (direct-acting oral anticoagulants)?

A
  1. apixaban
  2. rivaroxaban
  3. edoxaban
  4. dabigatran (direct thrombin inhibitor)
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18
Q

When is warfarin preferred over DOACs?

A
  1. stroke prevention in Afib WITH moderate to severe mitral stenosis or mechanical heart valve
  2. VTE treatment in patients WITH triple-positive antiphospholipid syndrome or mechanical heart valve
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19
Q

What agents directly inhibit thrombin, decreasing the amount of fibrin available for clot formation?

A
  1. Argatroban (IV)
  2. Bivalirudin (IV)
  3. Dabigatran (PO)
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20
Q

What conditions require more anti-platelet action vs. anticoagulation?

A
  1. coronary artery disease
  2. acute coronary syndromes
  3. PREVENTION of ischemic stroke/ TIA
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21
Q

What conditions are fibrinolytics appropriate for?

A
  1. acute ischemic stroke
  2. STEMI
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22
Q

What is the biggest side effect of anticoagulants?

A

bleeding

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23
Q

A drop ≥2 g/dL in what lab value could signify internal or external bleeding?

A

Hemoglobin

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24
Q

What can cause epistaxis (nose bleeds)?

A
  1. drugs
  2. dry nasal mucosa
  3. nose blowing
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25
Q

What can cause bleeding gums?

A
  1. new or worse than usual gingivitis
    –> counsel patients to use soft toothbrushes
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26
Q

What can cause bruising?

A
  1. drugs (chronic steroids)
  2. thrombocytopenia/ clotting disorder
  3. Cushing’s syndrome
  4. malnutrition
  5. fracture/sprain
  6. infection
  7. physical abuse
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27
Q

What can cause hematoma (internal bleeding from broken blood vessels; deep bruise)?

A
  1. can occur on the abdomen from LMWH injection that was rubbed
  2. epidural/spinal hematomas can occur in patients using LMWH or DOACs getting neuraxial anesthesia or spinal puncture
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28
Q

What can cause hematuria (blood in urine)?

A
  1. UTIs
  2. kidney stones
  3. prostatitis
  4. kidney disease
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29
Q

What can cause hematemesis (blood in the vomit)?

A
  1. esophageal (varices, chronic reflux)
  2. stomach/ duodenum (ulcer)
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30
Q

What can cause hematochezia (blood from the anus)?

A
  1. esophageal (varices, chronic reflux)
  2. stomach/ duodenum (ulcer)
  3. rectum (hemorrhoid, rectal tear)
  4. diverticulosis
  5. colon cancer
  6. IBD
  7. colon polyps
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31
Q

What infections can cause bloody diarrhea (dysentery)?

A
  1. C. diff
  2. Shigella
  3. Entamoeba hitsolytica
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32
Q

How can we tell where a GI bleed might be based on visual appearance?

A

the darker the bleeding site is away from the anus, the darker the stool; rectal bleeding from polyps might be occult; need fecal occult test to identify

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33
Q

Which medications do not cross-react with HIT antibodies?

A

IV direct thrombin inhibitors

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34
Q

What is the MOA of unfractionated heparin?

A

binds to antithrombin and potentiates its ability to inactivate thrombin (IIa), Xa, and other clotting factors (IXa, XIa, XIIa, and plasmin); prevents conversion of fibrinogen to fibrin

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35
Q

What is the dosing of heparin for VTE prophylaxis?

A

5000 units SQ Q8-12H

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36
Q

What is the dosing of heparin for VTE treatment?

A

80 units/kg IV bolus –> 18 units/kg/h

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37
Q

What is the dosing of heparin for ACS/STEMI?

A

60 units/kg IV bolus –> 12 units/kg/h

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38
Q

Heparin treatments are dosed off of which weight in kg?

A

total body weight

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39
Q

Why should heparin not be administered IM?

A

hematoma risk

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40
Q

What are CIs to heparin?

A
  1. uncontrolled active bleed (intracranial hemorrhage)
  2. severe thrombocytopenia (low platelets)
  3. history of HIT
  4. benzyl alcohol formulations in neonates, pregnancy, breastfeeding, and infants
  5. pork containing products in those with pork hypersensitivity
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41
Q

What are the warnings with heparin?

A

fatal medication errors; verify the correct concentration is chosen

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42
Q

What are SEs with heparin?

A
  1. bleeding (epistaxis, bruising, gingival, GI)
  2. thrombocytopenia
  3. HIT
  4. hyperkalemia
  5. alopecia
  6. osteoporosis (long-term use)
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43
Q

What should be monitored while on heparin treatment?

A
  1. aPTT or anti-Xa level (Q6H until therapeutic, at every dose change, and daily)
  2. platelets (baseline and daily)
  3. Hgb (baseline and daily)
  4. Hct ( baseline and daily)
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44
Q

What should be monitored while on VTE prophylaxis with SQ heparin?

A
  1. platelets (baseline and daily)
  2. Hgb (baseline and daily)
  3. Hct ( baseline and daily)
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45
Q

What is a therapeutic aPTT range while on heparin?

A

1.5 -2.5x control (per specific institutional protocol

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46
Q

What is a therapeutic anti-Xa range while on heparin?

A

0.3-0.7 units/mL

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47
Q

What lab value suggests HIT?

A

a drop in platelets >50% from baseline

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48
Q

Why is heparin dosed IV for VTE and ACS treatment?

A

rapid onset and short half life (1.5h)

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49
Q

Why is heparin dosed SQ for VTE prophyaxis?

A

longer onset (20-30 minutes) vs. IV administration

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50
Q

What dosage form of heparin is only used to keep IV lines open?

A

heparin lock-flushes (HepFlush)

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51
Q

Which dosages of heparin are look alike and sound alike and has been fatal especially in neonates?

A

heparin injection (10,000 units/mL)
and heparin flushes (10-100 units/mL)

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52
Q

What is the MOA of LMWHs?

A

binds to antithrombin and potentiates its ability to inactivate thrombin (IIa) and Xa; prevents the conversion of fibrinogen to fibrin; factor Xa inhibition is much greater than IIa

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53
Q

What is the antidote for UFH and LMWHs?

A

protamine

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54
Q

What is the dosing of enoxaparin for VTE prophylaxis in those with normal renal function?

A
  1. 30mg SQ BID
  2. 40mg SQ QD
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55
Q

What is the dosing of enoxaparin for VTE prophylaxis when CrCl <30 ml/min?

A

30mg SQ QD

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56
Q

What is the dosing of enoxaparin for VTE, unstable angina, and NSTEMI treatment?

A
  1. 1 mg/kg SQ Q12H
  2. 1.5 mg/kg SQ QD (only for inpatient VTE treatment)
  3. CrCl <30 ml/min: 1 mg/kg SQ QD
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57
Q

What is the dosing of enoxaparin for STEMI in patients <75 y/o?

A
  1. 30mg IV bolus + 1 mg/kg SQ dose (MAX 100mg for the first IV+SQ doses only), followed by 1 mg/kg SQ Q12H
  2. CrCl <30: 30mg IV bolus + 1 mg/kg SQ dose followed by 1 mg/kg SQ QD
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58
Q

What is the dosing of enoxaparin for STEMI in patients >75 y/o?

A
  1. 0.75 mg/kg SQ Q12H (no bolus); (MAX 75mg for first 2 SQ doses)
  2. CrCl <30: 1 mg/kg SQ QD (no bolus)
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59
Q

LMWHs are dosed based off of which weight in kg?

A

total body weight

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60
Q

What is the dosing of dalteparin for VTE prophylaxis?

A

2500-5000 units SQ QD

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61
Q

What is the dosing of dalteparin for unstable angina/NSTEMI treatment?

A

120 units/kg SQ Q12H (MAX 10,000 units)

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62
Q

What are boxed warnings for LMWHs?

A

patients undergoing neuraxial anesthesia (epidural/spinal) or undergoing spinal puncture are at risk of hematomas and subsequent paralysis

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63
Q

What are CIs to using LMWHs?

A
  1. Hx of HIT
  2. active major bleed
  3. hypersensitivity to pork
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64
Q

What should be monitored on LMWHs?

A
  1. platelets
  2. Hgb
  3. Hct
  4. SCr
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65
Q

In what populations is it recommended that anti-Xa levels for LMWHs be monitored?

A
  1. pregnancy
  2. renal insufficiency
  3. obesity
  4. low body weight
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66
Q

When should anti-Xa levels be obtained in special populations taking LMWHs?

A

peak anti-Xa levels 4 hours post-SQ dose

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67
Q

What are important storage and administration requirements for LMWHs?

A
  1. store at room temperature
  2. do not administer in patients with HIT, antibodies will cross-react
  3. do not expel air bubble prior to administration (can cause loss of drug)
  4. do not administer IM
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68
Q

What drugs interact with LMWHs?

A

drugs that can increase bleeding risk:
1. NSAIDs
2. SSRIs/SNRIs
3. fibrinolytics
4. anticoagulants/antiplatelets
5. some herbal supplements

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69
Q

Enoxaparin

A

Lovenox

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70
Q

Dalteparin

A

Fragmin

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71
Q

What is the MOA of HIT?

A
  1. the immune system forms IgG antibodies against heparin bound to platelet factor 4
  2. the antibodies join with heparin and PF4 to make a complex
  3. complex binds to Fc receptors on platelets
  4. platelet activation band release of pro-coagulant microparticles
  5. pro-thrombotic state
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72
Q

How is the probability of HIT assessed?

A

4 Ts:
1. Thrombocytopenia
2. Timing of platelet drop (hours up to 5-10 days after starting heparin)
3. Thrombosis (or skin lesions that are necrotizing or non-necrotizing)
4. oTher causes

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73
Q

How is HIT confirmed?

A
  1. heparin-PF4 antibody enzyme-linked immunosorbent assay (ELISA) test
  2. functional assay (serotonin release assay or heparin-induced platelet aggregation assay)
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74
Q

How is HIT managed/treated?

A
  1. stop all forms of heparin and LMWH (if on warfarin D/C and administer vitamin K)
  2. immediately treat with non-heparin anticoagulants (Argatroban)
  3. DO NOT start warfarin therapy until platelets ≥ 150,000 cells/mm3 and should be initiated at lower doses
  4. overlap warfarin with a non-heparin anticoagulant for at least 5 days and after the INR is in target for >24 hours
  5. if urgent cardiac surgery or PCI is required use Bivalrudin
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75
Q

What is the MOA of PO factor Xa inhibitors?

A

directly inhibit factor Xa

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76
Q

What is the MOA of Fondaparinux (SQ factor Xa inhibitor)?

A

injectible synthetic pentasaccharide that selectively and indirectly inhibits factor Xa by binding to anti-thrombin

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77
Q

What are boxed warnings with PO factor Xa inhibitors?

A
  1. patients undergoing neuraxial anesthesia (epidural/spinal) or undergoing spinal puncture are at risk of hematomas and subsequent paralysis
  2. premature discontinuation increases risk of thrombotic events
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78
Q

What are boxed warnings unique to edoxaban?

A

reduced efficacy in nonvalvular AF patients with CrCl >95 ; DO NOT USE

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79
Q

What are CIs with PO factor Xa inhibitors?

A

active pathological bleeding

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80
Q

What are general warnings with PO factor Xa inhibitors?

A
  1. not recommended with prosthetic heart valves or triple-positive antiphospholipid syndrome (all 3 antibodies positive)
  2. avoid in patients with moderate to severe hepatic impairment
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81
Q

What are SEs with PO factor Xa inhibitors?

A

generally well tolerated unless bleeding occurs

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82
Q

What are unique SEs with edoxaban?

A
  1. rash
  2. elevated LFTs
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83
Q

What is monitored with PO factor Xa inhibitors?

A
  1. Hgb
  2. Hct
  3. SCr
  4. LFTs
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84
Q

How can PO factor Xa inhibitors be administered if patients have trouble swallowing or have an NG tube?

A

all can be crushed and put on applesauce or suspended in water

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85
Q

How can apixaban be administered if patients have trouble swallowing or have an NG tube?

A

can be crushed and mixed with D5W, water, or applesauce

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86
Q

How long before elective surgery shoud PO factor Xa inhibitors be discontinued?

A

rivaroxiban: 24 hours prior
edoxaban: 24 hours prior
apixaban: 48 hours prior with mod-high bleeding risk; 24 hours prior with low bleeding risk

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87
Q

What is the dosing of apixaban for nonvalvular AF (stroke prophylaxis)?

A
  1. 5mg PO BID
  2. if 2/3 conditions met (≥80 y/o, ≤60mg TBW, SCr ≥1.5); 2.5mg PO BID
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88
Q

What is the dosing of apixaban for DVT/PE treatment?

A

Initial: 10mg PO BID x 7days, then 5mg PO BID (Eliquis DVT/PE started pack)
Extended (≥ 6 months of initial treatment): 2.5 mg PO BID

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89
Q

What is the dosing of apixaban for DVT prophylaxis post hip/knee replacement?

A

Knee: 2.5mg PO BD x 12 days; give first dose 12-24 hours after surgery
Hip: 2.5mg Po BID x 35 days ; give first dose 12-24 hours after surgeryv

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90
Q

What should a patient do if they miss a dose of apixaban?

A

take immediately on the same day, then resume BID dosing; DO NOT double the dose to make up for a missed dose

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91
Q

Which PO Xa-inhibitor is available as a suspension?

A

rivaroxaban

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92
Q

What should doses of rivaroxiban ≥15 mg be administered with?

A

food

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93
Q

What is dosing of rivaroxaban for nonvalvular AF (stroke prophylaxis)?

A

CrCl>50: 20mg PO QD with evening meal
CrCl 15-50: 15mg PO QD with evening meal
CrCl <15: 15 mg PO QD (per manufacturer, but limited data)

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94
Q

What is the dosing of rivaroxaban for DVT/PE treatment?

A

Initial: 15mg PO BID x 21 days, then 20mg PO QD with food
Extended (≥ 6 months of initial treatment): 10mg PO QD
CrCl 15-30: use caution
CrCl<15: DO NOT USE

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95
Q

What is dosing of rivaroxaban for DVT prophylaxis (after hip/knee replacement) and VTE prophylaxis in acutely ill medical patients)?

A

knee: 10mg PO QD x 12 days
hip: 10mg PO QD x 35 days
acutely ill: 10mg PO QD x 31-39 days
CrCl 15-30: use caution
CrCl<15: DO NOT USE

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96
Q

What is dosing of rivaroxaban for risk reduction of major CVD events in PAD/CAD?

A

2.5 mg PO BIS in combination with low dose aspirin
CrCl< 15: 15mg PO QD (per manufacturer)

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97
Q

What should be done if a dose of rivaroxaban is missed?

A

If taking 15mg BID: take immediately to ensure intake of 30mg/day (2 tablets can be taken at once) then resume regular schedule the following day
If taking 10,15,20mg QD: take immediately on the same day, otherwise skip (DO NOT DOUBLE UP)

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98
Q

What is andexanet alfa (Andexxa) an antidote for?

A

apixaban and rivaroxaban

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99
Q

What is the dosing of edoxaban for nonvalvular AF (stroke prevention) ?

A

CrCl> 95: DO NOT USE
CrCl 51-95: 60mg PO QD
CrCl: 15-50: 30mg PO QD
CrCl< 15: not recommended

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100
Q

What is the dosing of edoxaban for the treatment of DVT/PE?

A

60mg QD after 5-10 days of parenteral anticoagulation
CrCl 15-50, TBW ≤60kg, or certain P-gp inhibitors: 30mg QD
CrCl<15: not recommended

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101
Q

What should be done if a dose of edoxaban is missed?

A

take immediately on the same day; DO NOT DOUBLE UP

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102
Q

Apixaban

A

Eliquis

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103
Q

Rivaroxaban

A

Xarelto

104
Q

Edoxaban

A

Savaysa

105
Q

What are boxed warnings for fondaparinux?

A

neuraxial analgesia (epidural/spinal) or spinal puncture are at increased risk of hematomas and subsequent paralysis

105
Q

Fondaparinux

A

Atraxia

106
Q

What are CIs to using fondaparinux?

A
  1. CrCl<30ml/min
  2. active major bleed
  3. bacterial endocarditis
  4. thrombocytopenia with a positive test for anti-platelet antibodies in the presence of fondaparinux
107
Q

What are SEs with fondaparinux?

A
  1. bleeding (epistaxis, bruising, gingival, GI)
  2. anemia
  3. local injection site reactions (rash, pruritus, bruising)
  4. thrombocytopenia
108
Q

What is the dosing of fondaparinux for VTE prophylaxis?

A

≥50kg: 2.5mg SQ QD
<50kg: contraindicated

109
Q

What is the dosage of fondaparinux for VTE prophylaxis?

A

<50kg: 5mg SQ QD
50-100kg: 7.5mg SQ QD
>100kg: 10mg SC QD

110
Q

What are warnings with fondaparinux?

A
  1. CrCl 30-50mL/min: use caution
  2. do not expel air bubble from syringe prior to the dose
  3. Do not administer IM
    4, No antidote (indirect inhibition)
111
Q

What is monitored on fondaparinux?

A
  1. platelets
  2. Hgb
  3. Scr
  4. anti-Xa levels (one time 3 hours post-dose; does not have to be routine)
112
Q

How should fondaparinux pre-filled syringes be stored?

A

room temperature

113
Q

What drugs interact with all factor Xa inhibitors?

A

medications that increase bleeding risk:
NSAIDs
antiplatelet drugs
SSRI/SNRIs
fibronolytics
Cobicistat-containing products can increase exposure of factor Xa inhibitors:
Tybost
Stribild
Genvoya

114
Q

What drugs should be avoided with apixaban (major CYP3A4 and P-gp substrate) due to drug interaction?

A

strong dual CYP3A4 and P-gp inducers:
1. carbamazepine
2. phenytoin
3. rifampin
4. st.johns wart

115
Q

What drugs interact with apixaban requiring doses >2.5 mg BID to be reduced by 50% AND should be voided in those taking 2.5mg BID (major CYP3A4 and P-gp substrate)?

A

strong dual CYP3A4 and P-gp inhibitors:
1. itraconazole
2. ketoconazole
3. ritonavir

116
Q

What drugs should be avoided with rivaroxaban (major CYP3A4 and P-gp substrate) due to drug interaction?

A

strong dual CYP3A4 and P-gp inducers:
1. carbamazepine
2. phenytoin
3. rifampin
4. st.johns wart
strong dual CYP3A4 and P-gp inhibitors:
1. itraconazole
2. ketoconazole
3. ritonavir

117
Q

What drugs must provide benefit over risk in patients taking rivaroxaban (major CYP3A4 and P-gp substrate) due to drug interaction??

A

patients with CrCl 15-80 and receiving combined P-gp and moderate CYP3A4 inhibitors:
1. diltiazem
2. verapamil
3. dronedarone
4. erythromycin

118
Q

What medication should be avoided with edoxaban? (P-gp substrate)

A

rifampin

119
Q

What drugs interact with edoxaban requiring dose reduction to 30mg QD when treating DVT/PE?

A
  1. verapamil
  2. macrolides (azithromycin, clarithromycin, erythromycin)
  3. oral itraconazole/ketoconazole
120
Q

How is warfarin converted to other oral anticoagulants?

A

D/C warfarin and start other when:
Rivaroxaban when INR<3
Edoxaban when INR≤2.5
Apixaban when INR <2
Dabigatran when INR <2

121
Q

How are rivaroxiban and apixiban converted to warfarin?

A
  1. stop factor Xa inhibitor
  2. start parenteral anticoagulant and warfarin at next scheduled dose
122
Q

How is edoxaban converted to warfarin?

A

refer to package labeling for conversion recommendations

123
Q

How is dabigitran converted to warfarin?

A

start warfarin 1-3 days before stopping dabigatran (determined by renal function- refer to dabigatran labeling)

124
Q

What is the MOA of direct thrombin inhibitors?

A

directly inhibit thrombin ( factor IIa); bind to active site of free and clot-associated thrombin

125
Q

What are boxed warnings for dabigatran?

A
  1. patients reciving neuraxial anesthesia (epidural/spinal) or spinal puncture are at risk of hematomas and subsequent paralysis
  2. premature discontinuation increases risk of thrombotic events
126
Q

What are CIs wth dabigatran?

A
  1. active pathological bleeding
  2. treatment of patients with mechanical heart valve
127
Q

What are the warnings with dabigitran?

A
  1. not recommended for triple-positive antiphospholipid syndrome
  2. can increase aPTT, PT/INR
  3. discontinue if undergoing invasive surgery (1-2 days if CrCl≥50 or 3-5 days of CrCl<50)
128
Q

What are SEs with dabigitran?

A
  1. dyspepsia
  2. gastritis-like symptoms
  3. bleeding (including GI bleeding)
129
Q

What is the dosing of dabigitran for nonvalvular AF?

A

150mg BID
CrCl15-30: 75mg BID
CrCl<15 avoid use

130
Q

What is the dosing of dabigatran for the treatment and prevention of recurrent DVT/PE?

A

150mg BID starts after 5-10 days anticoagulation
CrCl≤30 mL/min avoid use

131
Q

What is the dosing of dabigatran for DVT/PE prophylaxis after hip replacement?

A

110mg on day 1 then 220mg daily
CrCl≤30 mL/min avoid use

132
Q

What should the patient do if they miss a dose of dabigatran?

A

take it immediately unless within 6 hours of the next scheduled dose; do not double the dose to make up for it

133
Q

What are important counseling points for the storage and administration of dabigatran?

A
  1. dispense in original container (protects capsules from moisture) and dispose of the container 4 months after opening
  2. blister packs are good until the date on the pack
  3. swallow capsules whole
  4. do not administer capsules or pellets via NG/OG tube (increases bioavailability by 75%)
134
Q

What is the antidote for dabigatran?

A

idarucizumab (Praxbind)

135
Q

What are CIs to IV direct thrombin inhibitors (argatroban, bivalirudin)?

A

active major bleed

136
Q

What are SEs with IV direct thrombin inhibitors (argatroban, bivalirudin)?

A
  1. bleeding (mild to severe)
  2. anemia
137
Q

What is monitored with IV direct thrombin inhibitors (argatroban, bivalirudin)?

A
  1. aPTT and/or activated clotting factor (efficacy)
  2. platelets
  3. Hgb
  4. Hct
  5. renal function
138
Q

What is the approved indication for argatroban?

A

patients with HIT

139
Q

What is the approved indication for bivalirudin?

A

patients with or at risk of HIT undergoing percutaneous coronary intervention (PCI)

140
Q

How is argatroban dosed for HIT?

A

initiate 2 mcg/kg/min then titrate to a goal aPTT
MAX: 10mcg/kg/min

141
Q

How is bivalirudin dosed for HIT (or suspected)?

A

IV bolus followed by infusion; all weight based dosing

142
Q

What dosage adjustments are required for renal/hepatic impairment in IV direct thrombin inhibitors (argatroban, bivalirudin)?

A

argatroban: decrease dose in hepatic impairment
bivalirudin: decrease dose when CrCl<30

143
Q

What are drug interactions with dabigitran (P-gp substrate)?

A
  1. avoid use with rifampin (or any P-gp inhibitor if CrCl<50 (CrCl<30 in nonvalvular Afib)
  2. reduce dose to 75mg BID if CrCl 30-50 in nonvalvular A fib and concurrent use of dronedarone nor systemic ketoconazole
144
Q

What is the outcome of P-gp inducers interacting with anticoagulants that are substrates of P-gp?

A

increased transport of drug to intestinal lumen for excretion in the feces; decreased anticoagulation effect; subtherapeutic

145
Q

What is the outcome of P-gp inhibitors interacting with anticoagulants that are substrates of P-gp?

A

decreased transport of drug to intestinal lumen for excretion in the feces; increased anticoagulation effect; supratherapeutic

146
Q

What is the outcome of P-gp and CYP3A4 inducers interacting with anticoagulants that are substrates of both enzymes?

A
  1. increased transport of drug to be excreted in feces
  2. increased CYP enzyme available to breakdown the drug
  3. decreased anticoagulation effect; subtherapeutic
147
Q

What is the outcome of P-gp and CYP3A4 inhibitors interacting with anticoagulants that are substrates of both enzymes?

A
  1. decreased transport of drug to be excreted in feces
  2. decreased CYP enzyme available to breakdown the drug
  3. increased anticoagulation effect; supratherapeutic
148
Q

What medications can increase exposure to dabigatran?

A

Cobicistat-containing products:
1. Tybost
2. Stribild
3. Genvoya

149
Q

What is the MOA of warfarin?

A

competitively inhibits the C1 subunit of vitamin K epoxide reductase (VKORC1) enzyme complex –> decreases the production of active clotting factors (II, VII,IX, and X) and natural anticoagulants protein C and protein S

150
Q

What are boxed warnings for warfarin?

A

major or fatal bleeding

151
Q

What are CIs to using warfarin?

A
  1. pregnancy (except with mechanical heart valve at risk for thromboembolism)
  2. hemorrhagic tendencies
  3. blood dyscrasias
  4. malignant HTN
  5. non compliance
  6. recent or potential surgery of eyes or CNS
  7. major regional lumbar block analgesia or trauma surgery resulting in large open surfaces
  8. pericarditis or pericardial effusion
  9. bacterial endocarditis
  10. preeclampsia/eclampsia
  11. possible miscarrige
152
Q

What are warnings with warfarin?

A
  1. tissue necrosis/gangrene
  2. HIT (CI as monotherapy in initial treatment of active HIT)
  3. systemic arhtroemboli and cholesterol microemboli (PURPLE TOE SYNDROME)
  4. presence of CYP2C9 *2 or *3 alleles and /or polymorphism of VKORC1 gene may increase bleeding risk
153
Q

What are SEs with warfarin?

A
  1. bleeding/bruising
  2. skin necrosis
154
Q

What are the monitoring parameters for warfarin?

A
  1. INR monitoring after the initial 2-3 doses, if chronic then every 4-12 weeks
  2. HCT
  3. Hgb
    4.signs of bleeding
155
Q

What conditions have a goal INR 2-3 (target 2.5)?

A

most indications:
1. VTE
2. AF
3. bioprosthetic mitral valve
4. mechanical aortic valve
5. antiphospholipid syndrome

156
Q

What conditions have a goal INR of 2.5-3.5 (target 3)?

A
  1. mechanical mitral valve
  2. 2 mechanical heart valves
  3. mechanical aortic valve with 1 additional risk factor (hx DVT, AF, hypercoagulable state)
157
Q

Which 3x more potent enantiomer of warfarin is a substrate of CYP2C9 responsible for most drug interactions?

A

S-warfarin

158
Q

What medications are CYP2C9 inhibitors that increase the INR?

A
  1. amiodarone
  2. fluconazole (other azole antifungals)
  3. metronidazole
  4. Bactrim
  5. capecitabine
  6. cimetidine
  7. fluvastatin
  8. tigecycline
158
Q

What medications are CYP2C9 inhibitors that decrease the NR?

A
  1. carbamazepine
  2. phenobarbital
  3. phenytoin
  4. rifampin (large decrease)
  5. St.John’s wort
159
Q

What medication should be avoided with warfarin?

A
  1. tamoxifen
  2. SERMs
  3. estrogens
  4. drugs that increase clotting risk
160
Q

How much should the warfarin dose be reduced when starting amiodarone?

A

30-50%

161
Q

What other medications can increase the effect of the anticoagulant effect of warfarin?

A
  1. PCNs
  2. quinolones
  3. tetracyclines
  4. some cephalosporins
162
Q

What are pharmacodynamic drug interactions with warfarin?

A
  1. NSAIDs, antiplatelet agents, other anticoagulants, SSRI/SNRI may increase bleeding risk without increasing INR
  2. drugs that increase clotting risk should be avoided when possible (estrogen, SERMs)
  3. drugs that are highly protein bound may displace warfarin
163
Q

What natural/ herbal supplements can increase bleeding risk without increasing INR?

A
  1. 5Gs (garlic, ginger, ginkgo, ginseng, glucosamine)
  2. Vitamin E
  3. chondroitin
  4. dong quai
  5. high doses of fish oils
  6. Willow bark (a plant salicylate)
164
Q

What natural/herbal supplements decrease the effectiveness of warfarin?

A
  1. St. John’s wort
  2. coenzyme Q10
  3. green tea
165
Q

What foods are high in vitamin K?

A
  1. spinach (cooked)
  2. broccoli
  3. brussel sprouts
  4. collard greens
  5. kale
  6. green onion
  7. parsley
  8. swiss chard
  9. turnip greens
  10. endive
166
Q

What warfarin tablet color corresponds to what dose?

A

pink (1 mg)
lavender (2mg)
green (2.5)
brown (3mg)
blue (4mg)
peach (5mg)
teal (6mg)
yellow (7.5mg)
white (10mg)

167
Q

What is typical dosing of warfarin for healthy outpatients?

A

≤10mg QD for the first 2 days then adjust based on INR

168
Q

In what patients should lower starting doses ≤ 5mg of warfarin be used?

A
  1. elderly
  2. malnourished
  3. liver disease
  4. HF
  5. high risk of bleeding/other drugs that increase bleeding risk
169
Q

When should warfarin be started when a patient is being bridged from a parenteral anticoagulant for DVT/ PE treatment?

A

start warfarin while the patient is still on a parenteral anticoagulant; continue both anticoagulants for a minimum of 5 days and until the INR ≥2 for at least 24 hours

170
Q

If a patient with a stable therapeutic INR has a single low INR what should and should not be done?

A

Should: continue current dose and obtain repeat INR in 1-2 weeks if ≤0.5 below or above the therapeutic range
Should not: bridge with UFH or LMWH

171
Q

What dental procedure can be done without D/C warfarin?

A
  1. general cleaning
  2. single tooth extraction
172
Q

Why would anticoagulation need to be reversed?

A
  1. life-threatening bleed
  2. surgery
173
Q

What is the MOA of protamine for heparin and LMWH reversal?

A

protamine binds to highly acidic heparin to form a stable salt complex, neutralizing the anticoagulation effect

174
Q

What is the antidote for UFH/LMWH?

A

protamine

175
Q

What is the dosing of protamine for IV UFH reversal?

A

1mg protamine –> reverses ~100 units heparin; reverse the amount of heparin given within the last 2-2.5 hours due to short half-life
MAX dose 50mg

176
Q

What is the dosing of protamine for LMWHs?

A
  1. enoxaparin given within 8 hours: 1mg protamine –> 1mg enoxaparin
  2. enoxaparin given >8 hours ago: 0.5mg protamine per 1mg enoxaparin
  3. 1 mg protamine per 100 anti-xa units of dalteparin
177
Q

What are boxed warnings for protamine sulfate?

A
  1. hypersensitivity
  2. hypotension
  3. cardiovascular collapse
  4. non-cardiogenic pulmonary edema
  5. pulmonary vasoconstriction
178
Q

what are SEs with protamine sulfate?

A
  1. hypotension
  2. bradycardia
  3. flushing
  4. anaphylaxis
179
Q

What are important administration warnings with protamine?

A

rapid IV infusion causes hypotension; administer slow IV push (max rate 50mg over 10 min)

180
Q

What is used for the reversal of rivaroxaban and apixaban (and off-label for other Xa inhibitors)?

A

Andexanet alfa (Andexxa)

181
Q

What are boxed warnings with Andexxa?

A
  1. thromboembolic risk
  2. ischemic events
  3. cardiac arrest
  4. sudden death
182
Q

What are SEswith Andexxa?

A
  1. injection site reactions
  2. UTI
  3. pneumonia
  4. antibody development
183
Q

What is the reversal agent for dabigatran?

A

idarucizumab (praxbind)

184
Q

What are boxed warnings with idarucizumab?

A
  1. thromboembolic risk
  2. adverse reactions from sorbitol excipient
185
Q

What are SEs with idarucizumab?

A
  1. headache
  2. constipation
  3. hypersensitivity reaction
186
Q

What is dosing for idarucizumab?

A

5 g IV (given as two separate 2.5mg doses no more than 15 minutes apart)

187
Q

What are reversal agents for warfarin?

A
  1. Vitamin K/phytonadione
  2. Four factor Prothrombin complex concentrate
  3. Factor VII Recombinant (off-label)
  4. three factor prothrombin complex concentrate (off-label)
188
Q

What is dosing of Vitamin K for warfarin reversal?

A

1-10mg PO/IV

189
Q

Vitamin K / Phytonadione

A

Mephton

190
Q

Four Factor Prothrombin Complex Concentrate (human)

A

Kcentra, Balfaxar

191
Q

Three Factor Prothrombin Complex Concentrate (human)

A

Profilnine

192
Q

Factor VIIa Recombinant

A

NovoSeven RT, Sevenfact

193
Q

What are boxed warnings for vitamin K (phytonadione)?

A

severe reactions resembling hypersensitivity reactions have occurred rarely during or immediately after IV (even with proper dilution and rate of administration <1mg/min)

194
Q

What are SEs with vitamin K (phytonadione)?

A
  1. anaphylaxis
  2. flushing
  3. rash
  4. dizziness
195
Q

What is important with vitamin K (phytonadione) administration?

A
  1. requires light protection during administration
  2. SQ route not recommended due to variable absorption
  3. IM not recommended due to hematoma risk
  4. orlistat and mineral oil decrease oral vit K concentrations
196
Q

What is contained in Four Factor Prothrombin Complex Concentrate (human)?

A
  1. factor II
  2. factor VII
  3. factor IX
  4. factor X
  5. protein S
  6. protein C
197
Q

What are boxed warnings with Four Factor Prothrombin Complex Concentrate (human)?

A

arterial and venous thromboembolic complications have been reported

198
Q

What are CIs with Four Factor Prothrombin Complex Concentrate (human)?

A
  1. known HIT (contains heparin)
  2. disseminated intrvascualr coagulation (DIC with Kcentra only)
  3. IgA deficiency with antibodies to IgA (Balfaxar only)
199
Q

What are SEs with Four Factor Prothrombin Complex Concentrate (human)?

A
  1. headache
  2. N/V/D
  3. asthenia
  4. hypotension
  5. hypokalemia
  6. thrombotic events
200
Q

What is important about administration of Four Factor Prothrombin Complex Concentrate (human)?

A
  1. administer with vitamin K
  2. do not let drug back up into line it will clot
  3. allow to reach room temperature prior to administration if refrigerated
  4. each vial can have a different potency of multiple coagulation factors; actual potency stated in vial
201
Q

What are warnings with Three Factor Prothrombin Complex Concentrate (human)?

A
  1. contains factors II, IX, and X but low or nontherapeutic levels of VII and should not be confused with Kcentra that contains therapeutic amounts of VII
  2. made from human blood and may carry risk for transmitting infectious agents (virus)
202
Q

What are SEs with Three Factor Prothrombin Complex Concentrate (human)?

A
  1. chills
  2. fever
  3. flushing
  4. nausea
  5. headache
  6. risk of thrombosis
203
Q

What is important with administration of Three Factor Prothrombin Complex Concentrate (human)?

A
  1. administer with vitamin K
  2. administer via slow infusion and give antihistamine to minimize SEs
  3. given with fresh frozen plasma or factor VIIa
204
Q

What are boxed warnings for factor VIIa recombinant?

A

serious thrombotic events are associated with the use of factor VIIa

205
Q

What should be done if INR is above the therapeutic range but <4.5 without bleeding?

A

reduce or skip warfarin dose; resume when INR is therapeutic

206
Q

What should be done if INR is 4.5-10 without active bleeding?

A

routine use of vitamin K not recommended; hold 1-2 warfarin doses and monitor INR; resume at lower dose
Oral vitamin K can be used if urgent surgery is needed(≤5mg then 1-2mg in 24 hours prn) or bleeding risk is high (1-2.5mg)

207
Q

What should be done if INR> 10 without bleeding?

A

hold warfarin, give oral vitamin K 2.5-5mg, and monitor INR; resume at lower dose

208
Q

What should be done if INR> 10 with bleeding?

A

hold warfarin, give vitamin K 5-10mg slow IV injection and four-factor prothrombin complex concentrate (PCC)

209
Q

Why is four-factor prothrombin complex concentrate (PCC) preferred over fresh frozen plasma for warfarin reversal?

A
  1. less allergic reaction
  2. less infection risk
  3. less preparation time
  4. quicker onset
  5. lower volume
210
Q

How long before major surgery should warfarin be stopped?

A

5 days

211
Q

Which patients should have bridge therapy with therapeutic UFH or LMWH while off warfarin prior to surgery and after restarting warfarin for 5 days?

A
  1. mechanical heart valve
  2. atrial fibrillation
  3. VTE
  4. at high risk for thromboembolism
212
Q

How long before surgery should therapeutic doses of SQ LMWH be discontinued?

A

24 hours

213
Q

How long before surgery should therapeutic doses of IV heparin be discontinued?

A

4-6 hours

214
Q

When should warfarin be restarted after surgery?

A

12-24 hours after surgery or adequate hemostasis

215
Q

What should be done if INR is elevated 1-2 days before surgery?

A

give low dose vitamin K 1-2 mg

216
Q

What should be done if an urgent reversal of warfarin is required for a procedure?

A

give low dose 2.5-5mg vitamin K PO/IV

217
Q

What are symptoms of DVT?

A
  1. pain
  2. unilateral leg swelling
218
Q

What are symptoms of a PE?

A
  1. chest pain
  2. shortness of breath
219
Q

How is DVT diagnosed?

A
  1. ultrasound/ MRI/venography
  2. D-dimer
220
Q

How is PE diagnosed?

A

pulmonary CT angiogram

221
Q

What are modifiable VTE risk factors?

A
  1. acute medical illness
  2. immobility
  3. medications (SERMs, ESA, estrogen)
  4. obesity (BMI≥30)
  5. pregnancy/postpartum
  6. recent surgery/trauma
222
Q

What are non-modifiable risk factors?

A
  1. increasing age (>40 surgical, >70nonsugical)
  2. cancer/chemo
  3. previous VTE
  4. inherited or acquired thrombophilia
  5. disease states (HF, nephrotic syndrome respiratory failure)
223
Q

What are non-drug alternatives to prevent VTE?

A
  1. intermittent pneumatic compression (IPC devices)
  2. graduated compression stockings
224
Q

What is recommended for long-distance travelers to prevent VTE?

A
  1. frequent ambulation
  2. calf muscle exercises
  3. sitting in the aisle seat
  4. use graded compression stockings with 15-30 mmHg at the ankle during travel
225
Q

How long should full-dose treatment of VTE last?

A

3 months

226
Q

What patients is extended VTE treatment at full or reduced dose of anticoagulants recommended?

A
  1. unprovoked VTE and low bleeding risk
  2. ≥ 2 unprovoked VTE episodes
227
Q

What medications are contraindicated in patients with a history of or current VTE?

A

estrogen-containing medications and SERMS

228
Q

What anticoagulants are preferred for the first 3 months of VTE treatment in patients without cancer?

A
  1. dabigatran
  2. oral Xa inhibitors
229
Q

What anticoagulants are preferred for the first 3 months of VTE treatment in patients with cancer?

A

oral Xa inhibitors

230
Q

What is recommended in patients with unprovoked VTE who are stopping anticoagulation?

A

aspirin if not CI

231
Q

Why is stroke prevention important in those with AF?

A

clots in the heart (left atrial thrombus) that can travel to the brain and cause cardioembolic stroke or TIA

232
Q
A
233
Q

How is the need for chronic anticoagulation for AF determined?

A

based on stroke risk; CHA2DS2VASc scoring system

233
Q

When is temporary anticoagulation utilized in AF?

A

patients undergoing cardioversion

234
Q

What is the target INR when using warfarin as anticoagulation prior to cardioversion?

A

2-3

234
Q

How long do patients with AF ≤ 48 hours undergoing elective cardioversion need anticoagulation?

A

start full anticoagulation at presentation, perform cardioversion, and continue full anticoagulation for at least 4 weeks while in normal sinus rhythm

234
Q

What AF patients have the highest risk of clotting/stroke?

A

patients with a mechanical heart valve and AF

234
Q

How long do patients with AF < 48 hours or unknown duration need anticoagulation for cardioversion?

A

at least 3 weeks prior to and 4 weeks after cardioversion (when normal sinus rhythm is preferred?

235
Q

Which AF patient should only recieve warfarin for anticoagulation?

A
  1. mechanical heart valve
  2. mitral stenosis
235
Q

What is the most common type on AF?

A

nonvalvular; no heart valve involvement

235
Q

How is CHA2DS2VASc score calculated?

A

C: CHF- 1pt
H: HTN- 1pt
A2: age ≥75- 2pt
D: diabetes- 1pt
S2: prior stroke history- 2pt
V: vascular disease (MI, PAD, aortic plaque)- 1pt
A: age <75- 1pt
Sc: sex category, female sex- 1pt

236
Q

What CHA2DS2VASc score is anticoagulation not recommended?

A

0- male
1-female

237
Q

What CHA2DS2VASc score is anticoagulation recommended if the patient has additional risk facotrs?

A

1- male
2- female

238
Q

What CHA2DS2VASc score are DOACs recommended due to high stroke risk?

A

≥2- male
≥3- female

239
Q

What is the HAS-BLED scoring system used for?

A

assesses bleeding risk in patients requiring anticoagulation for stroke prevention in AF; should be compared with CHA2DS2VASc score to make a individualized decision to anticoagulant

240
Q

How is HAS-BLED score calculated?

A

H: HTN (SBP>160)- 1pt
A: abnormal liver/kindey function- 1-2 pt
S: prior stroke- 1pt
B: bleeding tendency/predisposition- 1pt
L: labile INR (if on warfarin)- 1pt
E: elderly age >65- 1pt
D: drugs (aspirin, NSAIDs), excess alcohol use- 1-2 pts

241
Q

What anticoagulant agents are preferred in pregnancy?

A

LMWH

242
Q

What should be done if warfarin is utilized during pregnancy?

A
  1. can switch from LMWH to warfarin after the 13th week of pregnancy (do not use warfarin during the 1st trimester)
  2. switch back to LMWH closer to delivery
243
Q

What is recommended to be monitored during pregnancy when using LMWHs?

A

anti-Xa levels

244
Q

What agents have not been studied in pregnancy and should not be used?

A
  1. oral factor Xa inhibitors
  2. direct thrombin inhibitors
245
Q

What are key counseling points for all anticoagulants?

A
  1. can cause serious/life-threatening bleeding/bruising
  2. tell physician/dentist before any procedure is performed
  3. call provider if you fall, injury, or hit your head
  4. avoid alcohol
  5. many drug interactions
246
Q

What are key counseling points for dabigatran?

A
  1. take with a full glass of water, and swallow the capsule whole
  2. can cause dyspepsia
  3. only open 1 bottle of dabigatran at a time; use within 4 months of opening
  4. keep dabigatran in the original bottle or blister package; do not put in pill boxes
  5. if your next dose is < 6 hours away, skip the missed dose
247
Q

What are key counseling points for rivaroxaban?

A
  1. AF: take once daily with evening meal
  2. blood clots in the veins of the legs or in the lungs : take Qd or BID as prescribed with food at the same time every day
  3. if taken twice daily, can double up on missed dose
248
Q

What are key counseling points for SQ administration of enoxaparin?

A
  1. choose an area on the right or left side of your abdomen, at least 2 inches from the belly button
  2. wash your hands and clean the site
  3. remove the needle cap by pulling straight of the syringe; DO NOT twist the cap, can bend needle
  4. DO NOT expel air bubble from the syringe unless advised to do so by healthcare provider
  5. hold the syringe like a pencil, pinch an inch of skin fold, insert full length of needle at 90 degree angle
  6. press plunger with your thumb until syringe is empty
  7. pull needle straight out at the same angle and release skin fold
  8. point needle down, away from yourself and push down on the plunger to activate the safety
  9. Do NOT rub the site of injection, can lead to brusing
  10. place used syringe in sharps container
249
Q

What are key counseling points for warfarin?

A
  1. take at the same time everyday
  2. Ask your pharmacist if your tablet looks different
  3. can rarely cause purple toe syndrome or death of skin tissue (with pain)
  4. frequent blood monitoring required (INR)
  5. keep vitamin K intake consistent

RxPrep (63 decks)

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