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Antidysrhythmic Medications | 마이메르시 MyMerci
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Antidysrhythmic Medications

NCLEX Review Guide: Antidysrhythmic Medications

Classification and Mechanisms

Class I: Sodium Channel Blockers

  • Class IA (Quinidine, Procainamide, Disopyramide): Block sodium channels and prolong action potential duration, used for atrial and ventricular dysrhythmias
  • Class IB (Lidocaine, Mexiletine): Shorten action potential duration, primarily used for ventricular dysrhythmias
  • Class IC (Flecainide, Propafenone): Markedly slow conduction with minimal effect on action potential duration

Class II: Beta Blockers

  • Propranolol, Metoprolol, Atenolol: Block beta-adrenergic receptors, decrease heart rate and contractility, effective for supraventricular tachycardia

Class III: Potassium Channel Blockers

  • Amiodarone: Most commonly used, blocks potassium channels and prolongs repolarization, effective for both atrial and ventricular dysrhythmias
  • Sotalol, Ibutilide, Dofetilide: Prolong action potential duration and refractory period

Class IV: Calcium Channel Blockers

  • Verapamil, Diltiazem: Block calcium channels in AV node, slow conduction, used for supraventricular dysrhythmias

Key Points

  • Class I drugs affect sodium channels and are subdivided into A, B, and C based on their effects on action potential
  • Amiodarone is the most versatile antidysrhythmic but has significant side effects
  • Beta blockers are first-line for many supraventricular dysrhythmias

High-Yield Medications and Nursing Considerations

Amiodarone

  • Monitor for pulmonary toxicity: Obtain baseline chest X-ray and pulmonary function tests, assess for cough, dyspnea, and decreased oxygen saturation
  • Thyroid dysfunction monitoring: Check TSH, T3, T4 every 6 months as amiodarone can cause both hypo- and hyperthyroidism
  • Hepatotoxicity monitoring: Monitor liver enzymes (ALT, AST) regularly and assess for signs of hepatic dysfunction

Amiodarone Memory Aid

"AMIO-TOXIC"
A - Arrhythmias (treats)
M - Monitor thyroid
I - IV compatibility issues
O - Ocular toxicity
T - Thyroid problems
O - Oxygen (pulmonary toxicity)
X - X-ray chest (baseline)
I - Interactions (many)
C - Corneal deposits

Digoxin

  • Therapeutic level: 0.5-2.0 ng/mL; toxicity occurs >2.0 ng/mL
  • Signs of toxicity: Nausea, vomiting, visual disturbances (yellow-green halos), bradycardia, heart blocks
  • Hypokalemia increases digoxin toxicity risk; monitor potassium levels closely

Clinical Scenario

Patient on digoxin reports seeing yellow halos around lights and feels nauseated. Serum digoxin level is 2.8 ng/mL. Priority nursing action: Hold digoxin, notify physician, monitor cardiac rhythm, and check electrolytes.

Commonly Confused Concepts

Medication Primary Use Key Monitoring Major Side Effect
Amiodarone Atrial fib, V-tach Pulmonary, thyroid, liver Pulmonary toxicity
Digoxin Atrial fib (rate control) Drug level, K+ Bradycardia, heart block
Lidocaine Ventricular dysrhythmias Neurologic status CNS toxicity
Propranolol SVT, rate control BP, HR, respiratory Bronchospasm

Common Pitfalls

  • Don't confuse digoxin levels: Therapeutic is 0.5-2.0 ng/mL, NOT 0.5-2.0 mcg/mL
  • Amiodarone loading: Requires loading dose due to long half-life (up to 100 days)
  • Beta blockers can mask hypoglycemia symptoms in diabetic patients

Nursing Procedures and Interventions

IV Amiodarone Administration

  1. Use central line when possible; if peripheral, use large vein and rotate sites
  2. Dilute in D5W only (not normal saline) using non-PVC tubing
  3. Administer loading dose slowly over 10 minutes, then maintenance infusion
  4. Monitor for hypotension and bradycardia during infusion
  5. Assess injection site for phlebitis and extravasation

Digoxin Administration Guidelines

  1. Check apical pulse for 1 full minute before administration
  2. Hold if heart rate <60 bpm (or per facility protocol)
  3. Verify correct dose calculation, especially in pediatric patients
  4. Monitor for signs of toxicity before each dose
  5. Ensure adequate potassium levels before administration

Digoxin Pulse Check Memory Aid

"Before DIG, check the TICK"
Before giving Digoxin, check the apical pulse (heart's tick) for 1 minute

Study Tips and Quick Checks

Memory Strategies

  • Class I, II, III, IV: "Some Block Potassium Channels" (Sodium, Beta, Potassium, Calcium)
  • Digoxin toxicity: "NAVY" - Nausea, Arrhythmias, Visual changes, Yellow-green halos
  • Amiodarone monitoring: "PLATES" - Pulmonary, Liver, Arrhythmias, Thyroid, Eyes, Skin

Quick Check Questions

  • ☐ Can you name the four classes of antidysrhythmics and their mechanisms?
  • ☐ What is the therapeutic range for digoxin?
  • ☐ What are the major toxicities to monitor with amiodarone?
  • ☐ When should you hold digoxin?
  • ☐ What electrolyte imbalance increases digoxin toxicity?

Practice Scenario

A patient with atrial fibrillation is started on amiodarone. What baseline assessments and ongoing monitoring would you implement? Consider pulmonary function, thyroid function, liver enzymes, and ophthalmologic examination.

Remember: You've got this! Antidysrhythmics can be complex, but focus on the major classes, key monitoring parameters, and safety considerations. Practice identifying the differences between medications and their specific nursing implications. Your thorough preparation will help you provide safe, effective patient care!

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