Atropine in the Field
Objective: Put atropine in the bradycardia box, know when it is a delay, and keep organophosphate atropine as a different protocol.
Why This Is Hard
The rate is 38 and they are hypotensive. Crews give atropine, wait, give it again, and never open the pacer. AHA 2025: atropine is reasonable; it is less effective in infranodal block. Pacing should not wait.
- This is not a milligram lesson. Protocol owns the dose and repeat.
- If they are crashing in complete block, pads go on now.
- Organophosphate / SLUDGE atropine is a hazmat/protocol megadose pathway — not the ACLS bradycardia syringe by habit.
Field Rules (Education)
- Bradycardia: atropine may reverse vagal / AV-nodal slowing. Unstable patients still need TCP readiness.
- Mobitz II / complete block: atropine is less reliable. Do not stack delays.
- Heart transplant patients may not respond (denervated). Protocol/OLMC.
- Cholinergic poisoning uses atropine differently. See toxidromes. Do not mix the cards.
Field Pitfalls
- Waiting through three atropine cycles in a dying complete block.
- Using the bradycardia dose for organophosphate from memory.
- No pads on the chest while you draw.
Practice
60-second drill
Partner: 30 bpm, complete block, BP 60. Atropine vs TCP first and why.
Related: TCP, Bradycardia.
Sources & Further Study
Named guidelines for further study. They are not clinical orders and do not replace your protocol or medical direction.
- NASEMSO National Model EMS Clinical Guidelines (2022) — U.S. EMS model language; protocol still wins
- AHA 2025 Part 9: Adult ALS — atropine for bradycardia; less effective infranodal; do not delay pacing
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.