CVS Flashcards
3 types of atrial fibrillation
paroxysmal AF- episodes stop within 48h without trt
persistent AF- last > 7 days
permanent AF- present all the time
4 class of anti-arrhythmic drugs
CLASS I: Na+ blocker, membrane stabilising drugs: disopyramide, flecainide/propafenone (C/I in asthma, severe COPD, avoid in structural/ ischaemic heart disease) lidocaine
CLASS II: B blocker: propranolol, esmolol
CLASS III: K+ blockers: amiodarone (use b/f and a/f cardioversion), SOTALOL, dronedarone
CLASS IV: CCB (rate-limiting): verapamil, diltiazem
OTHER: adenosine, digoixin
two pathways for cardioversion to restore sinus rhythm
1 electrial current
2 pharmacological
which cardioversion method is preferred for arrhythmias > 48h
electrical
trt for acute new-onset presentation of arrhythmias 1-life threatening haemodynamic instability
electrical cardioversion
trt for acute new-onset presentation of arrhythmias 2- <48 hrs
rate or rhythm control (electrical or amiodarone/flecainide)
trt for acute new-onset presentation of arrhythmias 2- >48 hrs
rate control (verapamil, BB)
maintenance trt for arrhythmias: 1st line
rate control (BB not sotalol, CCB, digoxin) monotherpy -> dual therapy -> rhythm control
maintenance trt for arrthymias: 2st line
rhthym control: SOTALOL, amiodarone, dronedarone, flecainide, propafenone
What is “pill in the pocket” and which drug
self treatment for arrhythmias, FLECAINIDE or propafernone
preferred surgical treatment for atrial flutter
catheter ablation
What is the screening tool for risk of stroke
CHADS-VASc tool
what does CHA2DS2-VASc stand for? what score indicates treatment
Chronic heart failure Hypertension Age >75 (score2) Diabetes Stroke / TIA/ VTE Hx (score2) Vascular disease Age 65-74 Sex (M-1,F-2) Treat if score >2 or more
Treatment for pulseless/V fibrillation
immediate defibrillation and CPR then IV amiodarone in refractory
Trt for UNSTABLE sustained V tachycardia
direct current cardioversion, if fail add IV amidodarone
Trt for STABLE sustained V tachycardia
IV amiodarone preferred
Trt for NON-SUSTAINED V tachycardia
BB
maintanance trt for pt at high risk of cardiac arrest (2 types of therapy)
- implantable cardioverter defibrillator
2. some pt needs drugs e.g. sotalol, BB alone or BB + amiodarone
what’s prolonged QT interval also called
torsade de pointes
trt for QT prolongation i.e. TdP
magnesium sulphate
what are the causes for QT-prolongation (4)
- sotalol
- other drugs that prolong QT e.g. cirpofloxacin, amitriptyline, risperidone, ACE abx
- hypOKalaemia
- bradycardia
PSVT can go away spontaneously or with relflex vagal nerve stimulation (reduce BP) such as
valsalva manoeuvre, carotid sinus massage, immerse face in ice cold water
IV trt for PSVT
adenosine *c/i in asthma/copd, verapamil
trt for recurrent PSVT
catheter ablation or anti-arrhythmic drugs