Supraventricular Tachycardias Flashcards
Identify three pathological mechanisms of SVT
- AVNRT
- AVRT
- Inappropriate sinus tachycardia
Identify three cardiac causes of SVT
- MI
- Mitral valve disease
- Cardiomyopathy
- Pericarditis
- Myocarditis
Identify three non cardiac causes of SVT
- Caffeine
- Smoking
- Cocaine
- Methamphetamines
- Alcohol
- Phaeochromocytoma
Identify three characteristics of the palpitations of SVT
- Regular
- Fast
- Sudden onset with a jump
Identify three symptoms of SVT
- Syncope
- Angina
- Dyspnoea
- Polyuria
What is seen on ECG in AVNRT
- No P wave
- Tachycardia
What is seen on ECG in AVRT
- P wave between QRS and T wave
- Tachycardia
What is seen on ECG with WPW?
Upstroke delta wave on QRS complex
When should emergency cardioversion be performed?
- Haemodynamic instability
- Pulse > 150 bpm
- SBP < 90 mmHg
What is the first line treatment of an acute presentation of SVT with haemodynamic stability?
- Valsava manoeuvre
What is the second line treatment of an acute presentation of SVT with haemodynamic stability?
- Intravenous adenosine
Identify a contraindication for adenosine and an alternative drug that can be used in this group
- Asthmatics
- Intravenous diltiazem
When is cardioversion performed in SVT?
- When valsava manoeuvre, adenosine or diltiazem are unsuccessful
Identify three medications used in the prevention of recurrent SVT
- Diltiazem
- Verapamil
- Sotalol
- Flecainide
- Propafenone
Identify the treatment for recurrent episodes of SVT
- Catheter ablation
