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Management of Dysrhythmias | 마이메르시 MyMerci
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Management of Dysrhythmias

NCLEX Review Guide: Management of Dysrhythmias

Understanding Dysrhythmias

Basic Concepts

  • Dysrhythmias are abnormal heart rhythms caused by disturbances in the heart's electrical conduction system. They can originate from the atria, ventricles, or AV junction.
  • Normal sinus rhythm has a rate of 60-100 bpm with regular P waves preceding each QRS complex and consistent PR intervals.
  • Assessment includes monitoring hemodynamic stability, symptoms like chest pain, shortness of breath, dizziness, and syncope.

Key Points

  • Always assess patient tolerance and hemodynamic stability first
  • Unstable patients require immediate intervention regardless of rhythm type
  • Obtain 12-lead ECG for accurate rhythm identification

Common Dysrhythmias and Management

Atrial Dysrhythmias

  • Atrial Fibrillation: Irregularly irregular rhythm with absent P waves. Management includes rate control with beta-blockers or calcium channel blockers, and anticoagulation therapy to prevent stroke.
  • Atrial Flutter: Regular atrial rate of 250-350 bpm with sawtooth pattern. Treatment involves cardioversion for unstable patients or rate control medications for stable patients.
  • SVT (Supraventricular Tachycardia): Heart rate >150 bpm with narrow QRS complexes. First-line treatment includes vagal maneuvers, then adenosine 6mg IV push.

Ventricular Dysrhythmias

  • Ventricular Tachycardia (VT): Wide QRS complexes >120ms with rate >100 bpm. Pulseless VT requires immediate defibrillation, while stable VT may be treated with amiodarone.
  • Ventricular Fibrillation (VF): Chaotic, irregular waveform with no identifiable QRS complexes. Requires immediate CPR and defibrillation.
  • PVCs (Premature Ventricular Contractions): Early, wide QRS complexes. Treatment needed if >6 per minute, multifocal, or causing symptoms.

Key Points

  • Pulseless rhythms (VF, pulseless VT) require immediate defibrillation
  • Stable patients allow time for medication administration
  • Always check pulse and blood pressure before treatment decisions

Pharmacological Management

Antiarrhythmic Medications

Memory Aid: "ABCD" for Emergency Drugs

  • Adenosine - for SVT (6mg, then 12mg IV push)
  • Beta-blockers - for rate control
  • Calcium channel blockers - for rate control
  • Digoxin - for rate control in A-fib
  • Adenosine: First-line for stable SVT. Give 6mg rapid IV push, followed by 12mg if ineffective. Monitor for brief asystole - this is expected.
  • Amiodarone: Used for VT and VF. Loading dose 150mg IV over 10 minutes, then maintenance infusion. Monitor for pulmonary toxicity with long-term use.
  • Beta-blockers (Metoprolol): Reduce heart rate and contractility. Contraindicated in heart failure exacerbation and severe bradycardia.
  • Calcium Channel Blockers (Diltiazem): Effective for rate control in atrial fibrillation. Monitor blood pressure closely during administration.

Key Points

  • Always have crash cart available when giving antiarrhythmics
  • Monitor continuous ECG during medication administration
  • Check drug interactions, especially with digoxin

Non-Pharmacological Interventions

Electrical Therapies

  1. Cardioversion (Synchronized): Used for stable patients with atrial fibrillation, atrial flutter, or SVT. Ensure synchronization is ON to avoid R-on-T phenomenon.
  2. Defibrillation (Unsynchronized): Used for pulseless VT and VF. Start with 200 joules biphasic, increase as needed.
  3. Pacemaker Insertion: Temporary for symptomatic bradycardia unresponsive to medications. Permanent for chronic conduction disorders.

Clinical Scenario

Patient presents with chest pain, shortness of breath, and blood pressure 80/50 mmHg. ECG shows atrial fibrillation with rapid ventricular response at 180 bpm. This patient is unstable and requires immediate synchronized cardioversion, not rate control medications.

Key Points

  • Unstable = immediate electrical therapy
  • Stable = medication trial first
  • Always sedate conscious patients before cardioversion

Commonly Confused Concepts

Cardioversion Defibrillation
Synchronized to R wave Unsynchronized
Stable patients Pulseless patients
Lower energy (50-200J) Higher energy (200-360J)
Sedation required Patient unconscious

Memory Aid: "Stable = Synchronized"

If patient is stable and has a pulse, use synchronized cardioversion. If pulseless, use unsynchronized defibrillation.

Study Tips

  • Practice ECG rhythm strips daily - pattern recognition is key for NCLEX success.
  • Remember the "Big 4" life-threatening rhythms: VF, pulseless VT, asystole, and PEA - all require immediate CPR.
  • Use the mnemonic "Rate, Rhythm, P waves, PR interval, QRS" for systematic ECG interpretation.
  • Focus on patient stability assessment - hemodynamics determine urgency of intervention.

Quick Check Questions

  • ☐ Can you identify the difference between stable and unstable patients?
  • ☐ Do you know when to use synchronized vs. unsynchronized electrical therapy?
  • ☐ Can you list the first-line medications for SVT, VT, and atrial fibrillation?
  • ☐ Do you understand anticoagulation requirements for atrial fibrillation?

Remember: You're not just memorizing rhythms - you're learning to save lives! Every dysrhythmia concept you master brings you closer to becoming the confident, competent nurse your future patients need. Keep pushing forward! 💪

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