SVT algorithm Flashcards
(12 cards)
What is the typical heart rate threshold for diagnosing SVT in adults?
- > 150 beats per minute.
What are the key life-threatening features that indicate unstable SVT requiring immediate cardioversion?
A: Shock (hypotension), syncope, myocardial ischaemia (chest pain), and severe heart failure.
What is the first-line treatment for stable SVT?
A: Vagal maneuvers (e.g., Valsalva)
What is the dosing regimen for adenosine in adult SVT according to Resuscitation Council UK?
A: 6 mg rapid IV bolus, followed by 12 mg if no response, then 18 mg if still ineffective.
What is the management for unstable SVT?
A: Immediate synchronized cardioversion with sedation and analgesia if possible.
How is SVT differentiated from sinus tachycardia in clinical practice?
A: SVT has abrupt onset and termination, narrow QRS complex, and heart rate typically >150 bpm,
sinus tachycardia has gradual onset and rate usually <150 bpm
What are common precipitating factors for SVT?
A: Anxiety, exercise, caffeine, alcohol, electrolyte imbalance, and underlying heart disease.
When is amiodarone considered in SVT management?
A: For recurrent SVT refractory to adenosine or when cardioversion is unsuccessful
What is the role of synchronized cardioversion in SVT?
A: It is the treatment of choice for unstable patients or when pharmacological treatment fails.
What is the typical ECG finding in SVT?
A: Narrow QRS complex tachycardia, regular rhythm, often without visible P waves or with retrograde P waves.
What investigations should be done after SVT termination?
A: 12-lead ECG, electrolyte panel, thyroid function tests, and echocardiography if indicated.
SVT stable Mx algorithm
- Vagal maneuvres
- Adenosine 6, 12, 18 (rapid bolus)
- Verapamil / beta-blocker
- Syn DC shock up to 3 shocks
