Vaughan Williams classification of antiarrhythmics

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Avoid flecainide in patients with structural heart diseases
Beta-blockers
Nevivolol is a unique beta blocker; (beta-1 sepcific) that increases nitric oxide and thus does not cause erectile dysfunction as other beta-blockers.
Cardio-selective beta-blockers include:
Metoprolol, atenolol, Esmolol IV,
Amiodarone
very long half-life (>50 days)
Most severe side effects are related to the lungs and present as cough, fever, or painful breathing