A client with atrial fibrillation suddenly develops a heart rate of 175 to 195 per minute, blood pressure of 80/50 mmHg, chest pain, dizziness, and oxygen saturation of 88 percent. What should be done immediately?

1. A

   Increase oxygen flow

2. B

   Give an IV beta-blocker

3. C

   Perform synchronized cardioversion

4. D

   Perform unsynchronized defibrillation

Appeared in: NORCET-11 Mains

Explanation

• The patient's clinical presentation of atrial fibrillation with a rapid ventricular response (175-195 bpm) accompanied by hypotension (80/50 mmHg), chest pain, and dizziness signifies hemodynamic instability.
• According to Advanced Cardiac Life Support (ACLS) guidelines, synchronized cardioversion is the immediate and definitive treatment for any unstable tachyarrhythmia where the patient has a pulse.
• The primary goal is to rapidly terminate the arrhythmia to restore adequate ventricular filling time, improve cardiac output, and resolve the signs of shock and end-organ hypoperfusion.
• Delaying cardioversion to attempt rate control with medications in an unstable patient can lead to further deterioration and cardiac arrest.

Why Other Options Were Wrong

• Option A: Increasing oxygen flow is a necessary supportive measure due to the patient's hypoxia (SpO2 88%), but it does not correct the underlying life-threatening arrhythmia that is causing the hemodynamic collapse. It is an adjunct, not the primary, immediate intervention.
• Option B: Administering an IV beta-blocker is contraindicated in this hemodynamically unstable patient. Beta-blockers can cause further reduction in blood pressure and cardiac contractility, which would worsen the patient's shock state.
• Option D: Unsynchronized defibrillation is used for pulseless arrhythmias, specifically ventricular fibrillation (VF) and pulseless ventricular tachycardia (VT). This patient has a pulse and an organized rhythm (atrial fibrillation), making defibrillation inappropriate and potentially harmful.

Related Visual

Clinical Relevance

• Nursing practice connection: Use the key finding related to Management of Unstable Atrial Fibrillation to guide bedside assessment, documentation, and the next nursing action.
• Nurses must be able to rapidly recognize the signs of hemodynamic instability in a patient with a tachyarrhythmia: hypotension, altered mental status, signs of shock, ischemic chest pain, or acute heart failure.
• The nurse's role in this emergency includes calling for immediate help (e.g., rapid response team), ensuring IV access, preparing the cardioverter/defibrillator, and being ready to administer sedation as ordered before the procedure.
• What if? If this same patient had a heart rate of 175 bpm but a blood pressure of 110/70 mmHg and was only complaining of palpitations without chest pain or dizziness, they would be considered 'stable.' The initial treatment would then focus on rate control using medications like diltiazem or a beta-blocker, rather than immediate cardioversion.

How to Approach the Question

• First, analyze the patient's clinical data. Identify the rhythm (atrial fibrillation), the rate (very rapid, 175-195 bpm), and the vital signs/symptoms.
• Next, determine if the patient is stable or unstable. The presence of hypotension (BP 80/50), chest pain, and dizziness clearly indicates instability.
• Recall the fundamental principle of arrhythmia management: unstable patients require electricity, while stable patients can often be managed with medication first.
• Differentiate between the types of electrical therapy. Synchronized cardioversion is for unstable tachycardias with a pulse. Unsynchronized defibrillation is for pulseless arrhythmias (VF/pulseless VT).
• Since the patient is unstable and has a pulse, select synchronized cardioversion as the correct immediate intervention.
• Eliminate the other options: oxygen is supportive but not definitive, beta-blockers are for stable patients, and defibrillation is for pulseless patients.

Concept Tested & Keywords

• Concept Tested: Management of Unstable Atrial Fibrillation
• Stem keywords: atrial fibrillation, heart rate of 175 to 195, blood pressure of 80/50 mmHg, chest pain, dizziness, oxygen saturation of 88 percent
• Lead-in keywords: immediately
• Clinical cues: The combination of rapid heart rate and signs of poor perfusion (hypotension, chest pain, dizziness) indicates hemodynamic instability, which dictates the need for immediate electrical cardioversion.

Question ID

QtnaYj12S0vd6Zj0ehiB5-

Copy ID

Reference Book

E6 Medicine Davidson Principles Practice 24e p. 212-214

E6 Obstetrics Williams p. 53-73