Cardiovascular Flashcards
Ectopic beats treatment
- ectopic beats are spontaneous - rarely need treatment
- if treatment required - b-blockers
Atrial fibrillation treatment summary
- stroke risk
- ventricular rate or sinus rhythm control
Life threatening AF treatment
- haemodynamic instability = emergency electrical cardioversion ASAP for anticoagulation
AF onset < 48 hours - acute treatment
rate OR rhythm control
AF onset > 48 hours - acute treatment
rate control
What is used for urgent rate control
- IV b-blocker OR
- verapamil LVEF > > 40 %
If cardioversion (rhythm control) agreed:
- pharmacological = flecainide or amiodarone
- electrical = IV anticoagulation to rule out left atrial thrombus
AF maintenance treatment
- rate control monotherapy - b-blocker (not sotalol) or RLCCB (digoxin - sedentary in non-paroxysmal)
- rate control dual therapy
- rhythm control - electrical or pharmacological cardioversion
AF > 48 hours - maintenance treatment
- electrical preferred = risk of clotting so fully anticoagulated for at least 3 wks before and 4 wks after
Drug treatment post cardioversion
b-blocker OR 1 of:
Sotalol
Propafenone
Amiodarone
Flecainide
What is used with electrical cardioversion to improve success of procedure
amiodarone 4 wks before and up to 12 months after
Paroxysmal AF treatment
- ventricular rhythm control = b-blocker
- SPAF
- episodes of symptomatic paroxysmal AF = ‘pill-in-pocket’ - felcainide/propafenone PRN on symptoms
CHA2DS2VASc score
- congestive HF - 1
- hypertension - 1
- age 75+ - 2
- diabetes - 1
- stroke/tia - 2
- vascular disease - 1
- age 65-74 - 1
- sex = female = 1
- men > >1, women > >2 = thromboprophylaxis
Stroke risk treatment AF
DOAC in non-valvular AF or warfarin
Atrial flutter treatment
- rate or rhythm control but less effective
- rate control temporary until sinus rhythm restored = b-blocker or RLCCBS
- rhythm control = direct current cardioversion for rapid control. pharmacological, catheter ablation for recurrent flutter
- assess for stroke risk
- anticoagulant for 3 weeks if flutter lasted > 48 hours
Paroxysmal supraventricular tachycardia treatment
- terminate spontaneously/alone - no tx
- reflex vagal stimulation - valsalva manoeuvre with ECG monitoring - face in ice cold water/carotid sinus massage
- IV adenosine
- IV verapamil
- recurrent = catheter ablation, prophylaxis = b-blockers or RLCCBs
Ventricular tachycardia treatment
- pulseless VT or VFib = resuscitation (ECG = random)
- unstable sustained VT = direct current cardioversion - IV amiodarone - repeat current cardioversion
- stable VT = IV amiodarone - direct current cardioversion not sustained VT = b-blocker
- high risk cardiac arrest = maintenance = implantable cardioverter defibrillator, can add b-blocker alone or with amiodarone
Torsade de pointes (QT prolongation) treatment
- drug induced or caused by hypokalaemia and severe bradycardia = amiodarone, sotalol, macrolides, haloperidol, SSRIs, TCAs, antifungals
- self limiting but can be recurrent - impaired consciousness
- if not controlled = Vfib = death
- treat with IV magnesium sulfate
- b-blocker (not sotalol) and atrial/ventricular pacing considered
- no anti-arrhythmias = prolongs QT interval = worsens condition
Anti-arrhythmic drugs
- classified into acting on: supraventricular arrhythmias, ventricular arrhythmias or both
- also according to electrical behaviour:
1. membrane stabilising drugs (lidocaine, flecainide)
2. b-blockers
3. amiodarone, sotalol
4. RLCCBs ONLY - not ‘pines’
Warfarin and INR limits
- INR 2.5 = VTEs, AF, cardioversion, MI, cardiomyopathy
- INR 3.5 = recurrent VTEs or mechanical heart valves
- major bleed = stop warfarin - IV phytomenadione & dried prothrombin
- INR > 8, minor bleed - stop warfarin & IV vit K
- INR > 8, no bleeding - stop warfarin & oral vit K
- INR 5-8, minor bleed - stop warfarin & IV vit K
- INR 5-8, no bleed - withhold 1-2 doses of warfarin
- start warfarin when INR < 5
- monitor INR every 1-2 days in early tx, then very 12 weeks
Warfarin MHRA warning
skin necrosis & calciphylaxis (painful skin rash)
Warfarin side effects
- haemorrhage - vit K
- teratogenic - avoid in 1st and 3rd trimester - use contraception
Warfarin interactions
- vit K foods (leafy greens) - reverses warfarin
- pomegranate and cranberry juice - increase INR
- miconazole (OTC daktarin gel) - increases INR
- CYP 450 inhibitors/inducers - increase/decrease warfarin conc
Warfarin and surgery
- minor, low bleeding risk = INR < 2.5, warfarin restarted within 24 hours
- risk of bleeding = stop warfarin 3-5 days before, INR <1.5 day before surgery (vit K to reduce), if high risk VTE bridge with LMWH - stop LMWH 24 hours before restart LMWH 48 hours after
- emergency surgery = IV vit K and prothrombin complex, if can be delayed 6-12 hours - IV vit K alone