Vaughan Williams Classifications Flashcards by Karthika Velusamy | Brainscape

Q

Class 1a

A

Blocks Na channel
PROLONGS refractory period

Drugs: Dispyramide, Procainamide, Quinidine

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Q

Class 1b

A

Blocks Na channel
SHORTENS refractory period

Drugs: Lidocaine, Mexiletine, Phenytoin

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Q

Class 1c

A

Blocks Na channel
NO EFFECT on refractory period

Drugs: Flecainide, Propafenone

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Q

Class 2

A

B-adrenoreceptors

Drugs: Atenolol, Propanolol etc.

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Q

Class 3

A

K+ channel blockade

Drugs: Amiodarone, Bretylium, Sotalol

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Q

Class 4

A

Ca+ channel blockers

Drugs: Diltiazem, Verapamil

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Q

Class 5

A

Miscellaneous

Drugs: Adenosine, Digoxin, Magnesium sulphate

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