strokes and DOACS Flashcards
what are the 3 types of stroke?
transient ischaemic stroke
haemorrhagic stroke
ischaemic stroke
what are the symptoms of stroke?
FAST
face drop
arm weakness
slurred speech
time to dial 999
what medication must you avoid in stroke until haemorrhagic stroke has been excluded and why?
avoid antiplatelets bc pt could bleed out and die
how should transient ischaemic stroke be treated? [2 options]
1- aspirin 300mg asap with a PPI
2- clopidogrel [unlicensed] if intolerant to aspirin
what is the initial management of ischaemic stroke?
what if the patient has had a stroke for longer than 4.5 hours?
- initial treatment is alteplase within 4.5 hours of symptom onset for 24 hours [if intracranial haemorrhage is excluded]
- if pt has stroke for longer than 4.5 hours then give aspirin 300mg
- after wards you give aspirin 300mg [or clopidogrel 75mg] once daily for 14 days
what is the long term management of ischaemic and TIA stroke NOT associated with atrial fibrillation?
recommended: clopidogrel 75mg once daily
if clopidogrel unsuitable: MR dipyridamole 200mg twice daily WITH aspirin 75mg once daily
if clopidogrel and dipyridamole unsuitable: aspirin 75mg once daily alone
what is the long term management of stroke WITH atrial fibrillation?
warfarin and other anticoagulants
in addition to antiplatelet therapy, what is the long term management of ischaemic stroke and TIA?
hint: statins
what must you monitor?
what advice must you give patients?
high intensity statins [eg atorvastatin 20-80] 48 hours after a stroke.
monitor blood pressure target of less than 130/80
advice on lifestyle, diet, exercise, weight, alcohol
what is the initial management of intracerebral haemorrhage?
surgery
avoid all medication
what is the long term management of intracerebral haemorrhage stroke?
treat hypertension
avoid all meds
what drugs are in the drug class coumarins?
warfarin, phenindione, acenocoumarol
what is the onset of action of warfarin?
48-72 hours to get full anticoagulant effect - long time to work
what are the 4 different strengths of warfarin and their associated colours?
0.5mg = white 1mg = brown
3mg = blue 5mg = pink
what is an important interaction of warfarin?
miconazole daktarin oral gel.
switch to nystatin
what side effect is very common in patients on warfarin and what must you do if it occurs in a patient?
calciphylaxis - painful rash
refer to gp
what is the initial dose of warfarin for adults?
what is the maintenance dose of warfarin?
initial: 5-10mg daily on day 1, subsequent doses depend on prothrombin time
maintenance : 3-9mg daily at same time each day
what is the antidote for warfarin?
vitamin K [phytomenadione]
are coumarins safe in pregnancy? what can you use instead?
no
use heparins instead
what is inr and in which drug is it only measured in?
a measure of how long it takes the blood to clot
in warfarin only
what are the target warfarin INR values for recurrent DVT or PE and mechanical prosthetic heart valves?
What INR target value is satisfactory above and below this number?
- 5
0. 5
what is the target warfarin value for treatment of DVT and PE atrial fibrillation cardioversion dilated cardiomyopathy mitral stenosis or regurgitation myocardial infarction acute arterial embolism
2.5
what must you do if a patient is experiencing a major bleed on warfarin?
INR does not matter
stop warfarin
administer vitamin K phytomenadione by slow IV injection and/or dried prothrombin complex/fresh frozen plasma
what must you do if a patient has an INR greater than 8 with minor bleeding?
when can you restart warfarin?
stop warfarin
administer phytomenadione vit K. by slow iv injection. repeat dose of vitamin K if INR is still high after 24 hours
restart warfarin once INR smaller than 5
what must you do if a patient has an INR greater than 8 with NO bleeding?
when can you restart warfarin?
stop warfarin
IV phytomenadione by mouth orally. repeat dose of vitamin K if INR still high after 24 hour
restart warfarin if INR less than 5
what must you do if a patient has an INR of 5-8 with minor bleeding?
when can you restart warfarin?
stop warfarin
give phytomenadione slow iv injection
restart warfarin when less than 5
what must you do if a patient has an INR 5-8 with no bleeding?
when can you restart warfarin?
withhold 1 or 2 doses of warfarin
reduce subsequent maintenance dose
what are the 7 important drug interactions with warfarin?
miconazole daktarin gel st johns wart amiodarone aspirin alcohol carbamazepine bezafibrate
what is the interaction between warfarin and miconazole?
what is the action?
miconazole increases effects of warfarin
advise to avoid
what is the interaction between warfarin and fluconazole? what is the action?
fluconazole increases effects of warfarin
monitor and adjust dose
what is the interaction between warfarin and clarithromycin? what is the action?
clarithromycin increases effect of warfarin
monitor and adjust dose
what interactions does warfarin have with food and drinks?
- cranberry and pomegranate juice increase effects of warfarin AVOID
- green leafy veg/change in diet to brocolli, kale, green tea, spinach etc
- alcohol decreases warfarin
which combination has a higher risk of bleeding? clopidogrel and warfarin or aspirin and warfarin?
clopidogrel and warfarin
which heparins are preferred for patients with higher risk of bleeding and why?
unfractionated heparin because its effects can be stopped suddenly by stopping the infusion
which heparin works rapidly but has a short duration of action?
unfractionated heparins
what is primary and secondary prevention of cardiovascular events?
primary: never had any cardiovascular event
secondary: have had an event and now take medication to prevent it from happening again
is aspirin recommended for primary or secondary cardiovascular events?
only secondary
how do antiplatelets work?
decreases platelet aggregation in ARTERIES
What can you give a pt taking aspirin who also has high bleeding risk?
PPI
what is the recommended dose and instructions of dipyridamole?
200mg twice daily with or after food
what is the important prescribing and dispensing information regarding dipyridamole?
m/r capsules should be dispensed in original containers
remaining capsules should be discarded 6 weeks after opening
what are DOACS?
read
rivaroxaban
edoxaban
apixaban
dabigatran
why are DOACS more popular than warfarin?
they have no routine anticoagulant monitoring tests and less bleeding
how do DOACS work?
inhibit thrombin and factor xa
what are DOACS most common side effect?
haemorrhage
what are DOACS all contraindicated in?
antiphospholipid syndrome
what is the dose of rivaroxaban in acute coronary syndrome?
2.5mg twice daily
what is the dose of rivaroxaban in VTE prophylaxis?
what is the dose of rivaraxoban for stroke?
10mg once daily
20mg once daily
what is the dose of apixaban for VTE prophylaxis?
2.5mg twice daily
what is the dose of apixaban in stroke?
5mg twice daily
what must you monitor with DOACs?
kidneys
when would there need to be a dose reduction with DOACs?
ABCD age - older than 80 Body weight - under 60/62kg crcl - 15-50 drugs - eg verapamil, amiodarone, ciclosporin, erythromycin
what crcl should be avoided in DOACS?
under 15
which DOACs inhibit thrombin?
dabigaTran
which DOACS inhibit factor Xa?
rivaroxaban
edoxaban
apixaban
which DOACS have an antidote?
which is the only DOAC to not have an antidote?
antidote = i
rivaroxaban
dabigatran
apixaban
edoxaban = no i
what is the mode of action of warfarin?
inhibits vitamin K [decreasing clotting factors]
what are the 3 indications of DOACs?
what is an additional indication of rivaroxiban?
- prevention of VTE following hip/knee replacement surgery
- secondary prevention and treatment of DVT/PE
- prophylaxis of stroke and systemic embolism with non-valvular AF
- prevention of atherothrombotic events eg ACS
is routine monitoring for doacs required?
what should you monitor patients on doacs for signs and symptoms of?
no
bleeding or anaemia
how long do the effects of doacs last?
12-24 hours
what is the cautionary label for rivaroxaban for strengths 15 and 20mg only?
what is the brand name of rivaroxaban?
take with or just after food
xarelto
what is the cautionary label of apixaban?
what is the brand name of apixaban?
read additional info given with this medication
eliquis
what is the cautionary label of edoxaban?
what is the brand name?
read additional info given with this info
lixiana
what is the cautionary label of dabigatran?
what is the brand name?
read additional info, do not chew or crush, swallow whole
pradaxa
what are the 2 contraindications of doacs?
- conditions with risk factors eg antiphospholipid syndrome
2. concomitant treatment with any other anticoagulant agent
what should happen when you switch a patient from warfarin to rivaroxaban?
stop warfarin before rivaroxaban tor reduce risk of bleeding
what is the antidote for warfarin?
vitamin K/phytomenadione
andexanet alpha [ondexxya]
idrarucizumab [praxbind]
which is the antidote for rivaroxaban, apixaban and dabigatran?
riv and apixaban: andexanet alpha [ondexxya]
dabIgatran - iDrarucizumab
what is the antidote for heparin?
protamine
what is the dose of warfarin as anticoagulant treatment?
initially 5-10mg on day 1 then subsequent doses adjusted according to INR.
maintenance 3-9mg same time each day
what is the dose and duration of rivaroxaban for prophylaxis of VTE for KNEE replacement?
10mg once daily for 2 weeks
what is the dose and duration of rivaroxaban for prophylaxis of VTE for HIP replacement?
10mg once daily for 5 weeks
what is the dose and duration of rivaroxaban for treatment of DVT and PE?
[initial and maintenance dose]
initially 15mg twice daily for 21 days
maintenance 20mg once daily
what is the dose and duration of rivaroxaban for prophylaxis of recurrent DVT or PE?
what is the dose in high risk pt?
10mg once daily
20mg - high risk
what is the dose of rivaroxaban for prophylaxis of stroke/AF with ONE risk factor eg tia, chf, hypertension, diabetes, age over 75?
20mg ONCE DAILY
WHAT is the dose and duration of rivaroxaban for prophylaxis of atherothrombotic events following ACS?
2.5mg TWICE DAILY FOR 12 MONTHS
what is the dose and duration of apixaban for PROPHYLAXIS of VTE for KNEE replacement?
2.5mg TWICE DAILY for 10-14 days
what is the dose and duration of apixaban for PROPHYLAXIS of VTE for HIP replacement?
2.5mg TWICE DAILY for 28-32 days
what is the dose and duration of apixaban for TREATMENT of DVT/PE? [initial and maintenance doses?]
initially 10mg ONCE DAILY for 7 days. maintenance is 5mg TWICE DAILY
what is the dose of apixaban for PROPHYLAXIS of recurrent PE and DVT?
2.5mg TWICE DAILY
what is the dose of apixaban for PROPHYLAXIS of stroke/AF with at least ONE RISK FACTOR?
what about in patients with TWO RISK FACTORS?
5MG TWICE DAILY - pt with one risk factor
2.5 twice daily - pt with 2 risk factors
what is the dose of EDOXABAN for prophylaxis of stroke/AF with one risk factor, treatment of DVT, treatment of PE, prophylaxis of recurrent DVT, prophylaxis of recurrent PE
for patients UNDER 61kg?
for patients OVER 61kg?
30mg ONCE DAILY
60mg ONCE DAILY
what is the dose and duration of dabigatran for prophylaxis of VTE for knee replacement in..
adults aged 18-74 ?
adults aged over 75?
18-74: 110mg then 220mg ONCE daily for 10 DAYS
75+: 75mg then 150mg ONCE daily for 10 days
what is the dose of dabigatran for PROPHYLAXIS of STROKE?
110mg - 150mg TWICE DAILY