Ch 24/25 DRUGS Cardiac Rhythm & Contractility Pharmacology

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14 Terms

1
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Procainamide

Class: Antiarrhythmic

  • CLASS 1A (Na+ channel blocker)

  • Moderate - prolonged repolarization

  • Prefers OPEN sodium channels

Treats:

  • Supraventricular arrhythmias

  • Ventricular arrhythmias

  • Re-entrant arrhythmias

  • Acute ventricular tachycardia

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Lidocaine

Class: Antiarrhythmic

  • CLASS 1B (Na+ channel blocker)

  • Minimal - shortened repolarization

  • Prefers OPEN OR INACTIVE sodium channels

Treats:

  • Ventricular arrhythmias in emergencies

  • Ventricular tachyarrhythmias

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Flecainide

Class: Antiarrhythmic

  • CLASS 1C (Na+ channel blocker)

  • Major - prolonged duration (no action potential impact)

Treats:

  • Supraventricular arrhythmias

  • Ventricular arrhythmias

***BAD FOR patients with MI history (can worsen arrhythmias)

4
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Propranolol

Class: Antiarrhythmic

  • CLASS 2 (Beta-Adrenergic Antagonist)

Treats:

  • Tachyarrhythmias due to exercise and stress

5
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Pindolol

Class: Antiarrhythmic

  • CLASS 2 (Beta-Adrenergic Antagonist)

Treats:

  • Tachyarrhythmias due to exercise and stress

***PARTIAL AGONIST ACTIVITY = less side effects

6
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Ibutilide

Class: Antiarrhythmic

  • CLASS 3 (K+ channel blockers)

  • Prolonged repolarization

  • Increased refractory period

Treats:

  • Atrial defibrillation

7
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Verapamil

Class: Antiarrhythmic

  • CLASS 4 (Ca2+ channel blockers)

  • AV & SA nodes - slowed signaling

Treats:

  • Re-entrant arrhythmias involving the AV node

  • Hypertension

  • Angina

***BAD FOR patients using beta blockers (can cause heart failure)

8
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Adenosine

Class: Antiarrhythmic

  • Inhibits SA & AV node conduction

9
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Potassium

Class: Antiarrhythmic

  • Abnormal levels cause arrhythmias

10
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Digoxin

Cardiac Glycoside

  • Na+/K+ ATPase selective inhibitor

  • VERY COMMONLY USED

Treats:

  • Cardiac contraction issues in myocytes

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Dobutamine

Beta-Adrenergic Agonist

  • Racemic mixture

Treats:

  • Cardiogenic Circulatory Failure

12
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Epinephrine

Beta-Adrenergic Agonist

  • Nonselective

  • Beta1 agonist at all doses

  • Beta2 agonist at lose doses

  • Alpha1 agonist at high doses

Treats:

  • Cardiac arrest

13
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Amrinone

PDE Inhibitor

  • PDE3 selective

  • Increases cardiac contraction/heart rate

14
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Levosimendan

Calcium-Sensitizing Agent

  • Increases crossbridging

  • Activates ATP-sensitive K+ channels