Code 3 Workshop

Paramedic Education
Home/All lessons/Cardiac & ECG/Atrial Fibrillation with RVR
Lesson

Atrial Fibrillation with RVR

12 min Cardiac & ECG

Objective: Name AF with RVR as irregularly irregular, decide whether the rate is the emergency, and pick cardioversion versus rate-control framing — without treating it like regular SVT.

Why This Is Hard

AF with RVR is the common fast irregular rhythm. Crews either panic-cardiovert a talking 140 or push adenosine like it is SVT. AHA 2025 is blunt for the sick ones: if hemodynamic instability is attributable to AF/flutter with rapid rates, immediate electrical cardioversion. If they are perfusing, this is usually a rate-control and cause-hunt problem, not a “shock because the number is big” problem.

Say out loud
  • Irregularly irregular — no repeating pattern
  • Is the rate the reason they are crashing — or is this sepsis, bleed, hypoxia, or PE?
  • Unstable from the rate → synchronized cardioversion
  • Pre-excited AF (very fast, wide, irregular) → do not AV-nodal-block

Recognition

  • No consistent P waves; irregularly irregular QRS. Use your six-step pass.
  • RVR is a teaching label for a ventricular rate fast enough to threaten perfusion — there is no single magic cutoff. AHA cardioversion education notes immediate cardioversion is generally not needed if the rate is ≤150/min and they are stable — that is a hint, not a law. Perfusion wins.
  • New vs old AF matters for hospital anticoagulation and elective conversion. In the truck, stability and cause matter more than “when did this start?” if they are crashing.

Two Paths (Education)

  • Unstable because of the rate: synchronized cardioversion per protocol (AHA 2025: at least 200 J biphasic for AF is reasonable if you are using energy — protocol owns the number). Sedate if they are conscious and it will not delay a dying patient.
  • Stable: oxygen as indicated, 12-lead, IV, treat pain/fever/volume/hypoxia. Rate-control agents (beta-blocker or non-DHP calcium-channel blocker teaching class) only if your protocol includes them and this is not pre-excited AF. Many EMS systems do not carry those drugs — then your job is support, 12-lead, and destination.

Do Not

  • Treat AF with adenosine as if it were regular SVT. A diagnostic glimpse of flutter waves is not a care plan.
  • Cardiovert sinus tach or compensatory AF in a bleeder — fix the tank.
  • Give AV-nodal blockers in irregular, very fast, wide/changing QRS (WPW AF pattern). Shock if unstable.

Field Pitfalls

  • “It’s SVT” on an irregular strip.
  • Chasing a rate of 130 in a talking patient while skipping the 12-lead and a fever.

Practice

60-second drill

Partner: (1) irregular 180, pale, BP 70; (2) irregular 140, talking, febrile UTI; (3) irregular 220, wide and changing QRS. Path for each in one sentence.

Related: SVT & Adenosine, Stable vs Unstable Tachycardia, CardioStrip.

Sources & Further Study

Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.

Education only. Apply learning within your protocols and medical direction. This is not clinical care guidance.

Check Your Understanding

Street decisions from this lesson only. After you check, the key is highlighted. Education practice — not a certification exam.

1. AF with RVR on the monitor is typically:
2. If AF/flutter with a rapid rate is the reason the patient is in shock:
3. Adenosine as “treatment” for AF with RVR is:
4. Very fast, irregular, wide or changing QRS (possible WPW AF):
← SVT & Adenosine Framing Hyperkalemia on the Monitor →