Hemorrhagic Shock Resuscitation Simulator

Scenario

Interventions

Golden Window

Time remaining10:00

Patient Status

Stable — compensated

Circulating blood volume100%

Heart rate

78 bpm

Blood pressure

118/76

SpO₂

98%

Shock index

0.66

Resp. rate

16 /min

GCS

Blood units available4/4

How it works

The patient's circulating volume V follows a mass-balance ODE driven by your interventions:

dV/dt = -bleed(t) + crystalloid(t) + transfusion(t)
bleed(t) = k · severity · (tourniquet ? 0.04 : 1)

Oxygen-carrying capacity is tracked separately from volume. Whole-blood hemorrhage removes both in proportion (concentration is unchanged); crystalloid adds volume without hemoglobin, so it dilutes capacity; a transfused unit restores it via the same mixing rule:

O2cap_new = (O2cap_old · V_old ± mass_in) / V_new

Heart rate and blood pressure follow the classic hemorrhage-class staging: up to ~30% volume loss the baroreceptor reflex compensates — HR climbs, pulse pressure narrows, SBP holds. Beyond that the reflex fails and both HR and SBP decompensate toward arrest. SpO₂ relaxes toward a target set by perfusion, hemoglobin and whether O₂ is applied; shock index = HR ÷ SBP, with >0.9 flagging shock clinically.

Mild / Moderate / Severe — starts the case at a different initial blood loss.
Apply O₂ — raises the SpO₂ target and its recovery rate.
Direct pressure / tourniquet — cuts the ongoing bleed rate to a trickle.
IV bolus — repeatable; restores volume fast but dilutes oxygen-carrying capacity.
Transfuse PRBC — limited to 4 units; restores volume and capacity together.

Stabilize the patient (BP, SpO₂ and volume recovered, bleeding controlled) before the golden window runs out.

Active hemorrhage Perfusion / oxygenation

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