User guide

How a session runs.

One instructor drives the patient from a phone. The learners work a monitor-defibrillator that behaves like the real thing — and you decide what their actions achieve.

7QK3ZX 2:14

Sinus · HR 75 · SpO₂ 98

Patient Airway Device

Share the code or the link

SIMMER

75 98

AlarmsNIBP DEFIB PACER

Everything it can do

Rhythms

Sinus, AF, atrial flutter, SVT: Each with its characteristic rate; the HR control drives them directly.
1° / Mobitz I / Mobitz II / 3° block: Wenckebach lengthens the PR then drops a beat; complete block runs independent atrial and escape rhythms.
VT, VF, torsades, asystole: Selecting a rhythm snaps the rate instantly — a rhythm change is a sudden electrical event, not a ramp.
PEA: A flag on any organised rhythm: the ECG carries on, the pulse does not.

Vitals & transitions

HR, SpO₂, BP, RR, EtCO₂, temp, ST: Press-and-hold steppers: a tap is fine, holding accelerates.
ST elevation / depression: A real J-point-to-T plateau, so you can evolve a STEMI over minutes.
Change speed: Instant, smooth, or slow — how fast a change reaches the monitors.
Scenarios: Healthy, sepsis, hypoxia, STEMI, peri-arrest, VF, asystole — the whole patient in one tap.

Airway & signals

Breathing pattern: Cheyne-Stokes, Kussmaul, Biot, agonal, apnoea — rate and depth over time.
Capnogram shape: Bronchospasm shark-fin, rebreathing, curare cleft, oesophageal.
SpO₂ signal quality: Good, poor (motion artefact, unstable reading), or probe searching.
NIBP: A realistic cuff cycle the learner triggers — or continuous, so the number never goes stale.

Sensors & alarms

Leads / probe / capno line: Detach any of them: that trace flatlines and its numbers show dashes.
Technical alarms: A disconnected sensor is an equipment fault — a quiet, low-priority tone, never the patient alarm.
Patient alarms: High and medium priority, with flashing numerics and the limits on display.
Silence: Two-minute silence with a countdown, and a second tap resumes.

Defib & pacer (learner-operated)

Manual defib: Energy select → charge (with the rising tone) → shock. The waveforms keep running behind the panel.
Synchronised cardioversion: SYNC marks every sensed QRS and the shock lands on the R wave, never near the T.
Transcutaneous pacing: Rate and output in mA; at or above your threshold it captures — spikes, paced complexes, a real pulse.
Your rules: Preset what a shock does and what capture costs. Change it between shocks to script the arrest.

Joining & teaching together

QR code: Learners point a camera at the controller and they are on. No typing, no install.
Two instructors: A second instructor scans the separate instructor QR to take the controls too — both consoles stay in step. Learners hold the monitor code and can never take control with it.
Orphaned sessions: If the instructor's phone dies, another device can adopt the running session so the monitors never go dark.
Reconnects: Close the controller by accident and it rejoins the same session; monitors reconnect on their own.

Running it anywhere

Any browser: Phone, tablet, laptop, ward TV. Safari included — it is tested on WebKit every build.
Offline / locked-down Wi-Fi: Run one binary on a laptop and everything works on the local network with no internet at all.
Free: No account, no subscription, no per-seat licence.

Ready?

It's free, and it's running before your learners are.

Start a session →