Prevention

• flecainide 50 mg twice daily ^a

Why?

• Patients on at least 50 mg flecainide twice daily are less likely to have symptomatic arrhythmic episodes ^a
• Flecainide is not clearly more effective than propafenone ^d or verapamil ^d

Paroxysmal SVT: flecainide prevents symptomatic attacks

Patient	Treatment	Comparison	Outcome	CER	RRR (95% CI)	NNT (95% CI)
paroxysmal SVT a	flecainide 50 mg twice daily	placebo	no attacks	7.1%	-600% (-2700% to 75%)	2 (2 to 5)