Atrial Fibrillation vs Atrial Flutter
Both AFib and flutter are atrial tachyarrhythmias that increase stroke risk, but the NCLEX expects you to identify each by its signature ECG pattern and rhythm regularity. Choosing "irregularly irregular" for flutter — or missing anticoagulation for either — costs you the question.
Side-by-side comparison
- Chaotic, disorganized atrial activity
- Atrial rate 350–600 bpm
- Organized re-entrant atrial circuit
- Atrial rate ~300 bpm
- ★Irregularly irregular pulse
- Ventricular rate 100–180 bpm (variable)
- Regular or fixed-ratio rhythm
- ~150 bpm with classic 2:1 block
- No P waves; chaotic fibrillatory baseline
- Erratic, irregular R-R intervals
- ★Sawtooth flutter (F) waves
- Often 2:1, 3:1, or 4:1 conduction block
- Assess apical-radial pulse deficit
- CHA₂DS₂-VASc guides anticoagulation
- Same CHA₂DS₂-VASc scoring applies
- Often harder to rate-control
- Rate control (BB/diltiazem) + anticoagulate
- Sync cardioversion 120–200 J biphasic
- Same rate-control/anticoagulant agents
- ★Sync cardioversion at lower 50–100 J
- Anticoagulation adherence; bleeding precautions
- If >48 hr, anticoagulate ≥3 wk before DCCV
- Same anticoagulation thresholds as AFib
- Or rule out clot with TEE first
- Rapid ventricular response with hypotension
- New focal deficits → cardioembolic stroke
- 1:1 conduction → dangerously fast rate
- Unstable rhythm → urgent cardioversion
- ★Highest cardioembolic stroke risk
- Heart failure from chronic tachycardia
- Stroke risk elevated, slightly < AFib
- May degenerate into atrial fibrillation
Atrial Fibrillation
- Chaotic, disorganized atrial activity
- Atrial rate 350–600 bpm
Atrial Flutter
- Organized re-entrant atrial circuit
- Atrial rate ~300 bpm
Atrial Fibrillation
- ★Irregularly irregular pulse
- Ventricular rate 100–180 bpm (variable)
Atrial Flutter
- Regular or fixed-ratio rhythm
- ~150 bpm with classic 2:1 block
Atrial Fibrillation
- No P waves; chaotic fibrillatory baseline
- Erratic, irregular R-R intervals
Atrial Flutter
- ★Sawtooth flutter (F) waves
- Often 2:1, 3:1, or 4:1 conduction block
Atrial Fibrillation
- Assess apical-radial pulse deficit
- CHA₂DS₂-VASc guides anticoagulation
Atrial Flutter
- Same CHA₂DS₂-VASc scoring applies
- Often harder to rate-control
Atrial Fibrillation
- Rate control (BB/diltiazem) + anticoagulate
- Sync cardioversion 120–200 J biphasic
Atrial Flutter
- Same rate-control/anticoagulant agents
- ★Sync cardioversion at lower 50–100 J
Atrial Fibrillation
- Anticoagulation adherence; bleeding precautions
- If >48 hr, anticoagulate ≥3 wk before DCCV
Atrial Flutter
- Same anticoagulation thresholds as AFib
- Or rule out clot with TEE first
Atrial Fibrillation
- Rapid ventricular response with hypotension
- New focal deficits → cardioembolic stroke
Atrial Flutter
- 1:1 conduction → dangerously fast rate
- Unstable rhythm → urgent cardioversion
Atrial Fibrillation
- ★Highest cardioembolic stroke risk
- Heart failure from chronic tachycardia
Atrial Flutter
- Stroke risk elevated, slightly < AFib
- May degenerate into atrial fibrillation
★ marks the fact that sets a column apart.
Clinical Pearl
Irregularly irregular with no P waves = AFib; sawtooth waves with regular rhythm = flutter.
Play this as a game — free
Drill Atrial Fibrillation vs Atrial Flutter in Swipe Right & Speed Sort. 14-day free trial, no card required.