CVS Flashcards
Symptoms of AF?
Palpitations, dyspnoea, dizziness and tiredness
What is paroxysmal AF?
Symptoms for less than 7 days
What is persistent AF?
Symptoms for more than 7 days
What is permanent AF?
Symptoms all the time
What are the two different types of AF control?
Rate and rhythm
What is first line treatment for AF?
Rate control with monotherapy
What medications are used in rate control of AF?
Beta blockers (not sotalol)
Rate limiting CCB (diltiazem and verapamil)
Digoxin
Which rate limiting CCB can cause constipation?
Verapamil
When can digoxin be used as monotherapy in AF?
For sedentary patients or patients with HF
What can be given if monotherapy rate control is not effective?
Dualtherapy with beta blocker + digoxin
What can be given if dual therapy rate control is not effective?
Rhythm control
What medications are used in rhythm control?
Beta blocker or anti arrhythmic drug
Exceptions to 1st line treatment of AF?
New onset within 48 hours = Rate/rhythm control
Patients with HF and reduced ejection fraction = dual therapy
Reversible cause
Which rate limiting CCB can never be given with a beta blocker?
Verapamil = severe bradycardia and hypotension
What medications are used for “pill in a pocket”
Flecainide or propafenone
When should “pill in a pocket” be used?
Infrequent episodes
When should “pill in a pocket” never be used?
In ischaemic heart disease
What is Torsade de pointes?
A life threatening form of arrhythmia caused by prolonged QT interval
Symptoms of torsade de pointes?
Fainting or seizures
Treatment of torsade de pointes?
IV magnesium sulphate
What does the CHASVASc score measure?
Risk of stroke
What does the orbit score measure?
Risk of bleeding for patients on anticoagulants in AF
What does CHADSVASc stand for?
C = chronic HF or LV dysfunction
H = hypertension
A2 = age 75+
D = diabetes
S2 = stroke / ischaemic attack / VTE history
V = vascular disease
A = aged between 65 - 75
Sc = sex category (females = 1)
What CHADSVASc score prompts anticoagulation?
2+ = anticoagulation with warfarin or DOAC
What does ORBIT stand for?
O = over 75
R2 = reduced Hb / anaemia
B2 = bleeding history
I = insufficient kidney function (<60)
T = treatment with anti platelets
What ORBIT score prompts avoiding anticoagulation?
Men = 2+
Women = 3+
What anti arrhythmic class is amiodarone?
3
Loading dose of amiodarone?
200mg TDS for 7 days, then 200mg BD for 7 days, then 200mg OD as maintenance
Side effects of amiodarone?
“PHONES”
P = pulmonary toxicity / QT prolongation
H = hyper/hypothyroidism / hepatic impairment
O = optic neuropathy
N = neuropathy of the limbs
E = eyes - corneal micro deposits
S = slate grey skin / photosensitivity
Amiodarone interactions?
“BCDDGW”
Beta blocker
CCB
Digoxin
Diuretics
Grapefruit juice
Warfarin
What is the therapeutic drug range for digoxin?
0.8 - 2micrograms/L
How long after doses should digoxin blood samples be taken?
6 hours post dose
Does digoxin require a loading dose?
Yes due to its long half life
When is digoxin contraindicated?
When heart rate is less than 60bpm
Digoxin dose in atrial flutter or non-paroxysmal AF?
125 - 250mg
Digoxin dose in worsening or severe HF?
62.5 - 125mg
Signs of digoxin toxicity?
“GRACE”
G = GI disorders
R = rash
A = arrhythmias caused by hypokalaemia
C = CNS effects E.g. confusion
E = eyes E.g. blurred or yellowing vision
What electrolyte disturbances can digoxin cause?
Hypokalaemia
Hypomagnesaemia
Hypercalcaemia
How should electrolyte disturbances caused by digoxin be treated?
Withdraw digoxin while electrolyte imbalances are corrected
Digoxin interactions?
“CRASED”
C = CCB
R = Rifampicin
A = amiodarone, quinine and donedarone - half dose of digoxin
S = SJW
E = erythromycin
D = diuretics
What is tranexamic acid?
Antifibrinolytic which helps reduce bleeding
Typical tranexamic acid dose?
1g TDS for 4 days
(7 days for nose bleeds)
What are the two types of VTE?
PE and DVT
VTE risk factors?
Immobility
Obesity
Cancer
60+
VTE history
HRT/COC
Pregnancy
Bleeding risk factors?
Thrombocytopenia (low platelet count)
Acute stroke
Bleeding disorder: acquired (E.g. liver disease) or inherited (e.g. haemophilia)
Anticoagulant use
Systolic hypertension
When should stockings be avoided?
In stroke patients
How long should stockings be used for?
Until sufficiently mobile / 30 days for spinal injuries
When is unfractionated heparin preferred over LMWH?
Renal impairment or increased risk of bleeding
Heparin alternative?
Fondaparinux
How long are heparins normally given for surgical VTE prophylaxis?
General surgery = 7 days
Abdominal surgery or cancer patients = 28 days
Spinal surgery = 30 days
Surgical VTE prophylaxis in hip surgery?
LMWH for 10 days then 28 days of low dose aspirin
OR
LMWH for 28 days + stockings/rivaroxaban
Surgical VTE prophylaxis in knee surgery?
Low dose aspirin for 14 days
OR
LMWH for 14 days + stockings/rivaroxaban
Which heparin is used if the patient has an increased risk of bleeding?
Unfractionated
Which heparin has lower risk of osteoporosis and thrombocytopenia?
LMWH
Reversal agent for LMWH?
Protamine (partial reversal)
Which electrolyte disturbance is caused by LMWH?
Hyperkalaemia
Which heparin causes osteoporosis when used long term?
Both but risk higher with unfractionated
How long does it take for warfarin to work?
2-3 days
Typical warfarin dose?
10mg OD for 2 days
Then 3-9mg OD
What should be done if a dose of warfarin is missed?
Take as soon as you remember if on the same day. If next dose is due omit previous dose (I.E. never take more than one in a day)
How long is warfarin given for an isolated calf DVT?
6 weeks
How long is warfarin given for a provoked VTE?
3 months
How long is warfarin given for an unprovoked VTE?
At least 3 months
What colour is the 0.5mg warfarin tablet?
White
What colour is the 1mg warfarin tablet?
Brown
What colour is the 3mg warfarin tablet?
Blue
What colour is the 5mg warfarin tablet?
Pink
Normal INR range for warfarin?
2.5
INR range in recurrent VTE while the patient was on anticoagulants?
3.5
How often is INR checked?
Every 12 months
MHRA alert for warfarin? (2)
- Calciphylaxis - report painful rash
- Miconazole (Daktarin) - severe interaction
What should be done if a patient taking warfarin has no bleeding but INR is between 5-8?
Hold 1 - 2 doses. Restart when INR below 5
What should be done if a patient taking warfarin has no bleeding but INR is >8?
Stop warfarin and give oral phytomenadione.
Repeat after 24 hours if still high.
Restart warfarin when INR is below 5.
What should be done if a patient taking warfarin has minor bleeding and INR is between 5-8?
Stop warfarin and give IV phytomenadione.
Restart warfarin when INR is below 5.
What should be done if a patient taking warfarin has minor bleeding and INR is >8?
Stop warfarin and give IV phytomenadione.
Repeat after 24 hours if still high.
Restart warfarin when INR is below 5.
What should be done if a patient taking warfarin has major bleeding and INR is between 5-8?
Stop warfarin and give IV phytomenadione + dried prothrombin.
Restart warfarin when INR is below 5.
What should be done if a patient taking warfarin has major bleeding and INR is >8?
Stop warfarin and give IV phytomenadione + prothrombin.
Repeat after 24 hours if still high.
Restart warfarin when INR is below 5.
When should patients taking warfarin report nose bleeds?
If they last greater than 10mins
When should patients taking warfarin report headaches?
Always due to risk of SAH
Main OTC interactions with warfarin?
Cranberry juice, pomegranate juice, leafy veg (high in vit K), Miconazole and NSAIDs
How long before surgery should warfarin be stopped?
5 days
What can be done if a patient needs to stop taking warfarin for a surgery but is at high risk of VTE?
Bridge with LMWH
Rivaroxaban MHRA interaction?
Erythromycin increases risk of bleeding
Rivaroxaban dose for VTE prophylaxis?
10mg OD
35 days = hip
14 days = knee
Rivaroxaban dose in recurrent VTE?
10mg OD for 6months
20mg if at high risk
Rivaroxaban dose in VTE treatment?
15mg BD for 21 days, then 20mg OD