Anti arrhythmic Meds Exam 2-Cardiac Flashcards
Class I-A action
Prolongs repolarization;
Inhibits fast sodium channel, decreases automaticity, depresses phase 0, prolongs the action potential duration
Class I-A medication
Procainamide
1-A used on what dysrythmia ?
A and V
Class I-B action
Accelerates repolarization: Inhibits fast sodium channel, depresses phase 0 slightly, shortens action potential duration
1-B medication
Lidocaine (IV/IVP)
Tocainide (PO form of lidocaine)
1-B what dysrhythmia?
Ventricular
1-B extra notes
- Takes care of Ventricular rhythms such as PVC’s or runs of V-tach
- May be on Lidocaine drip or Tocainide PO to send home with
Class I-C action
Little or no effect on repolarization: • Inhibits fast sodium channel, depresses phase 0 markedly
• Slows His-Purkinje conduction profoundly leading to a prolonged QRS duration
1-C medication
Flecainide
1-C treats what dysrhythmia?
A and V
Class II action
beta blocker:
•↓ automaticity & ↓ conduction leading to ↓ HR
•Depresses phase 4 depolarization
•Blocks sympathetic stimulation of the conduction system
Class II med
Propranolol
Class II notes
- Decreases workload of the heart – can decrease force of contraction
- May not be best for a pt in HF, but sometimes they are trial & error
- Use with caution in pts with MI because it can put them in HF
Class III action
Prolongs repolarization: •Blocks potassium channel, prolongs phase 3 repolarization, prolongs action potential duration
Class III meds
Amiodarone
Class III treats what dysrythmia
A and V
Class IV action
Calcium Channel Blockers: • Blocks calcium-channels to slow HR
• Inhibits inward calcium channel
• Depresses phase 4 depolarization, lengthens repolarization in phases 1 and 2
Class IV meds
Diltiazem (Cardizem)
Class IV treats what dysrhythmias
Atrial
Class IV notes
Prevents coronary artery spasm angina by causing smooth muscle relaxation
Anticholinergics action
increase HR
Anticholinergics meds
Atropine
Anticholinergic notes
Avoid in patient’s who have had a heart transplant; use theophylline instead
Catecholamines action
- Alpha-Beta1 Beta2 stimulant
- ↑ activity in all body systems
Catecholamines medication
Epinephrine
Catecholamine notes
Reserved for code status
Potassium channel opener action
- Allows influx of K more quickly
- Stops tachy arrhythmias
- Can cause short term asystole
- Given rapidly IVP
Potassium Channel Opener medication
Adenosine
Potassium Channel Opener treats what dysrythmia?
Atrial
Potassium Channel blocker notes
- Can monitor with a single lead heart monitor during administration (don’t have to have a continuous 12 lead ECG read out)
- Administer IVP undiluted by pushing as fast as you can – has very short half-life
Positive Ionotropic: Cardiac Glycoside
increase contractility–> positive inotropic
decrease HR–> negative chronotropic
