Trauma Bay ABCDE Primary Survey Simulator

Primary Survey — ABCDE

Assess the patient. Findings appear here as you complete each step.

Vitals

Heart rate

75 bpm

SpO₂

98%

Systolic BP

120 mmHg

Survival est.

99%

Scenario

Sim speed 1.0×

Second responder (team assist)

How it works

Each new patient gets a randomized hidden injury set — possible airway obstruction, possible tension pneumothorax, and an ongoing hemorrhage rate (mL/min). Vitals are driven by a simplified but real physiology model, integrated every frame:

loss   = 1 − blood/blood₀                (fractional blood volume lost, only while C is undone)
sysBP  = 120 − 150·max(0, loss − 0.15)    (compensated shock breaks down past ~15% loss)
HR     = 75  + 140·loss                   (reflex tachycardia)
SpO2 → 70% while airway is obstructed and untreated, → 85% while a tension
       pneumothorax is undecompressed — each relaxes toward target with a
       first-order lag (like a real monitor's response time)

An "insult" integral accumulates every second from hypoxia, hypotension and tachycardia; survival estimate = 100·e^−insult/40. This is why time-to-intervention matters, not just eventually doing the right thing.

A–E buttons — perform each step of the primary survey. Doing them out of ABCDE order still helps the patient but adds a fixed penalty to the insult integral (real trauma teams follow this order because it catches the fastest killers first).
Team assist — a second responder cuts the ongoing insult accumulation rate by ~35%, modeling parallel assessment and treatment.
Sim speed — fast-forwards the physiology clock so you can see outcomes without waiting in real time.

This mirrors the ATLS-style hemorrhagic shock classes (Class I–IV) and the rationale for the ABCDE sequence used in real trauma bays and battlefield first aid.

t = 0.0s

Active hemorrhage Cyanosis (low SpO₂)

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