💓 Dysrhythmias for the CEN Exam (Rhythm Recognition Made Easy)

Goal: On the CEN, you’re not just naming rhythms — you’re proving you can recognize danger fast, decide shockable vs non-shockable, and pick the best next ED action 🏥⚡

🚨 The “CEN Rhythm Game Plan” (3 Steps)

1️⃣ Patient First: Stable or Unstable?

Dysrhythmia becomes an emergency when it causes poor perfusion 🧠🫁🫀

🔥 UNSTABLE = treat NOW (think: “This patient is crashing”):

• 🧠 Altered mental status (confused, sleepy, syncope)
• 💔 Chest pain / ischemia
• 🫁 Acute respiratory distress or pulmonary edema
• 📉 Hypotension or shock signs (cool/clammy, weak pulses)
• 💧 Acute heart failure (new crackles, frothy sputum)

✨ CEN Power Rule:

• ⚡ UNSTABLE tachy + pulse → Synchronized cardioversion
• 💥 Pulseless VF/pVT → Defibrillation + CPR
• 🐢 UNSTABLE brady → Atropine → pacing → pressors

2️⃣ Strip Second: Wide or Narrow QRS?

QRS width tells you where the rhythm is coming from 📏🫀

• ✅ Narrow QRS (< 0.12 sec) = usually supraventricular (atria/AV node) 💓
• ⚠️ Wide QRS (≥ 0.12 sec) = usually ventricular or aberrant conduction 💥

🚑 ED Safety Trap (CEN loves this):
Wide-complex tachycardia = VT until proven otherwise 🧨

3️⃣ Pattern Third: Regular or Irregular?

This step instantly narrows your choices 🔍⚡

• 🟦 Regular + Narrow → SVT, Aflutter (fixed conduction) ⚡
• 🟪 Irregular + Narrow → AFib, MAT 🌀
• 🟥 Regular + Wide → VT, SVT w/ aberrancy 💥
• 🟧 Irregular + Wide → AFib w/ WPW, polymorphic VT (torsades) 🌪️

“Turn Phone Sideways to Take the (10) Question Exam.”

💥 Shockable vs Non-Shockable (Must Know)

🧠 The CEN “Don’t Miss” Dysrhythmias

These show up constantly in ED practice and on CEN questions 📚✨

💓 Supraventricular (Usually Narrow)

• 🌀 Atrial Fibrillation (AFib): irregularly irregular, no P waves
• 〰️ Atrial Flutter: sawtooth flutter waves (often 2:1)
• ⚡ SVT: very fast, regular, narrow; P waves often hidden
• 🎯 MAT: irregular + ≥3 different P-wave shapes (COPD trigger)

💥 Ventricular (Often Wide)

• 🧨 V-Tach (Monomorphic): wide + regular; treat as VT
• 🌪️ Torsades de Pointes: polymorphic VT + prolonged QT
• 💥 V-Fib: chaotic, no QRS; pulseless = defib now

🐢 Brady Rhythms + Blocks

• 🐢 Sinus Bradycardia: slow but organized (may be normal)
• 🧱 1st-degree AV block: PR prolonged, all beats conducted
• 🪜 Wenckebach (Mobitz I): PR gets longer → dropped beat
• 🚨 Mobitz II: random dropped beats (danger → pacing)
• 🔒 3rd-degree block: AV dissociation (often needs pacing)

🩺 “Next Best Action” Cheat Sheet (CEN Style)

🧩 H’s & T’s (PEA/Asystole Life-Savers)

When you see PEA/asystole, the exam wants you thinking: “What reversible cause am I missing?” 🔎

✨ CEN “Trap Alerts” (Exam Favorites)

• 🧨 Wide tachy? Assume VT until proven otherwise.
• ⚡ Don’t shock asystole or PEA. Shockable rhythms are VF/pVT only.
• 🌀 Irregular + wide can be AFib with WPW (danger zone).
• 💉 Adenosine is for regular narrow tachy (classic SVT), not “everything fast.”
• 🫀 Always treat the patient’s perfusion first, not the monitor.

📌 Ready to Practice Like the Real CEN?

Next step: Take a timed rhythm quiz and train your brain to react fast 🧠⚡

🚑 Start Dysrhythmia Practice Quiz

Tip: Replace the “#” link above with your FlexiQuiz quiz link.