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Cardiology & ResuscitationThe rhythms that change the next move

ECG EssentialsNREMT cheat sheet

Paramedic candidates are examined on the rhythms that change the next action: shockable versus non-shockable arrest rhythms, unstable rhythms with a pulse, and the 12-lead territories.

15 key facts Reviewed Oct 2026
The 1-minute sheetCinnaEMS

Shock

  • VF · pulseless VT

Don'T Shock

  • Asystole (confirm 2 leads) · PEA

With A Pulse

  • Unstable fast → synchronized cardioversion
  • Peaked T → high potassium

12-Lead

  • II, III, aVF inferior
  • V3–V4 anterior · I, aVL, V5–V6 lateral
Key takeaway

VF and pulseless VT are shocked; asystole and PEA are not.

Key points to remember

  • VF and pulseless VT are shocked; asystole and PEA are not.
  • Confirm asystole in more than one lead and check the connections.
  • Unstable tachycardia with a pulse: synchronized cardioversion.
  • II, III and aVF are inferior; V1–V2 septal; V3–V4 anterior; I, aVL, V5–V6 lateral.
  • Peaked T waves with a widening QRS suggest high potassium.

Field priorities

  1. Check right-sided leads before nitrates in an inferior infarction.
  2. Unsynchronized shocks are for pulseless rhythms only.

Coaching the patient

  • Epinephrine early in non-shockable arrest; after the first failed shock in shockable.

Red flags: act now

  • Hypotension or altered mentation with any fast or slow rhythm

ECG Essentials: FAQs

What are the priority actions for ECG Essentials in the field?

Check right-sided leads before nitrates in an inferior infarction. Unsynchronized shocks are for pulseless rhythms only.

What findings in ECG Essentials change your plan or your transport decision?

Hypotension or altered mentation with any fast or slow rhythm.

What do I need to know about ECG Essentials for the NREMT?

VF and pulseless VT are shocked; asystole and PEA are not. Confirm asystole in more than one lead and check the connections. Unstable tachycardia with a pulse: synchronized cardioversion. II, III and aVF are inferior; V1–V2 septal; V3–V4 anterior; I, aVL, V5–V6 lateral.

What should the crew communicate or document for ECG Essentials?

Epinephrine early in non-shockable arrest; after the first failed shock in shockable.

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