CVS Flashcards
What are the clinically significant bradyarrhythmias?
- Sinus bradycardia
- Normal but slow
- 1st degree HB
- PR interval >200ms
- 2nd degree heart block type 1
- Progressive PR prolongation followed by dropped QRS
- 2nd degree heart block type 2
- Constant PR interval with dropped QRS
- 3rd degree heart block
- No synchronisation between P waves and QRS complexes
- Right bundle branch block
- M in V1
- W in V6
- Left bundle branch block
- W in V1
- M in V6
What is 1st degree heart block?
Prolonged PR interval (>200msec)
What is 2nd degree type 1 heart block?
Progressive PR prolongation followed by dropped QRS
What is 2nd degree type 2 heart block
Constant PR interval with dropped QRS
What is 3rd degree heart block?
Complete desynchronisation of P waves and QRS complexes
What bradyarrhythmia is associated with cannon A waves in the JVP?
3rd degree heart block
What are the primary atrial tachyarrhythmias?
- Sinus tachycardia
- Normal, but fast
- Atrial flutter
- Regularly irregular
- F waves (saw tooth) in leads II, III, and aVF
- Atrial fibrillation
- Irregularly irregular
- No P waves
- Can be rapid or slow
- AVNRT
- Burried p waves
- retrograde p waves (lead III)
- Pseudo R waves (V1)
- AVRT
- Can be wide complex because of delta waves from QPQ
- Short PR interval
What does atrial flutter look like?
- Regularly irregular
- F waves (saw tooth) in leads II, III, and aVF
What does atrial fibrillation look like?
- Irregularly irregular
- No P waves
- Can be rapid or slow
What is the emergency treatment for AVNRT?
Adenosine
What are the primary ventricular tachyarrhythmias?
- Ventricular tachycardia
- Monomorphic
- Polymorphic
- Ventricular fibrillation
- Ventricular ectopics
What are the shockable and non-shockable rhythms?
Shockable:
- VF
- Pulseless VT
Non-shockable:
- Asystole
- Pulseless electrical activity
What is the acute management of atrial fibrillation?
Rate control:
- Metroprolol IV
- Esmolol IV
- Verapamil IV
- If ADRs
- Pacemaker + AV node ablation
Rhythm control:
- Electrical cardioversion
- Haem unstable - immediate
- Haem stable <48h - immediate
- Haem stable >48- check for mural thrombus of 3+weeks of anticoags.
- Chemical cardioversion
- Normal LVEF + No Cad
Anticoags:
- LMWH
- Enoxaparin
- Clexane
What is the chronic management of atrial fibrillation?
Rate control:
- LVEF>40%
- Atenolol (oral)
- Metoprolol (oral)
- LVEF<40%
- Carvedilol
- Bisoprolol
- Metroprolol + amiodarone
- If ADRs
- Diltiazem
- Verapamil
Rhythm control:
- Normal LVEF + no CAD
- Flecainide (oral)
- Sotalol (oral)
- If ADR
- Amiodarone
Anti-coags:
What are the risks of warfarin treatment?
- Bleeding
- Bruising
- Rashes
- N/V
- Jaundice
- Alopecia
What precautions must be taken whilst receiving warfarin treatment?
- Avoid contact sports
- Avoid Vitamin K rich foods
- <2 standard drinks of alcohol in a 24h period
What monitoring is required for warfarin treatment?
- INR
- Every day for 1 week
- Every week for 3 weeks
- Every month for 3 months
- If high risk, give clexane
- Warfarin book
What is the CHADSVASC score
- Congestive HF or LVEF<40% (1)
- Hypertension (1)
- Age >= 75 (2)
- Diabetes (1)
- Stroke / TIA / Thromboembolism (2)
- Vascular disease (1)
- Age 65-75
- Sex Category -F (1)
What arrhythmia is shown in this ECG?
AVNRT
- Narrow complex tachy (150bpm)
- No visible P waves
- Pseudo R’ waves in V1-2
What arrhythmia is shown in this ECG?
2nd degree- type 2 heart block
- PR interval constant
- Dropped QRS
What is the pathphysiology of CAD?
- Endothelial dysfunction leads to LDL deposition and the formation of foam cells (lipid phagocytosis from macrophages)
- This is followed by smooth muscle proliferation and fibrous cap formation (fibroblast initiation).
- A necrotic core forms
- ACS occurs when the fibrous cap rutpures. This results in platelet aggregation and the formation of a mural thrombus
- Agina can occur when the luminal space is narrowed sufficiently to produce ischemia in the absence of full occusion or thrombus.
What are the risk factors for CAD?
- Non-modifiable
- Age
- Male, or post-menopausal female
- Family history of early onset CVD
- Ethnicity (south asian, Maori/Pacifica)
- Modifyable
- Metabolic syndrome
- HTN
- Dyslipidaemia
- Obesity
- Impaired glucose tolerance
- Smoking
- High alcohol consumption
- Metabolic syndrome