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ECG Rhythm Lab
A live simulated patient monitor, and the reading skills around it. Watch the ECG, pulse oximetry and capnography sweep together in real time, pick from 51 rhythms carrying 218 tracings between them, then drive the rate, the saturation, the pressure and the capnography yourself. Cut any beat up factor by factor on real paper, learn ECGs from zero with Einthoven’s triangle and axis, or sit the 48-question test until calling rhythms is reflex. Rhythm interpretation is a core skill in PCP and ACP programs and one of the hardest to practise without a monitor in front of you, so this one is free, needs no account, and locks nothing.
Delta ECG Rhythm Lab
Pick a view
Call it with confidence on a 3-lead monitor: this is a rate, regularity, and conduction question.
How to read it
- Rate: count the R waves. 60 to 100 is normal.
- Rhythm: R to R spacing is even and regular.
- P waves: one upright P before every QRS in lead II.
- Intervals: PR 120 to 200 ms, QRS under 120 ms.
Cut it up: tap a factor
The first R wave is sitting on a heavy line for you. Name the next heavy lines 300, 150, 100, 75, 60, 50, and wherever the following R wave lands is the rate. This one runs 66 bpm, a normal rate. Normal is 60 to 100.
Regular rate and rhythm at 60 to 100 bpm. Upright P wave in lead II. PR interval 120 to 200 ms. QRS under 120 ms. Normal axis.
Sick or not sick: how it is managed
Read the patient: Normal sinus is the baseline, so the question is whether the patient's symptoms fit the rhythm or point somewhere else.
Stable / not sick
No rhythm treatment is needed. Confirm perfusion, treat what the patient actually complains of, and keep monitoring.
Unstable / sick
A sick patient with a normal rhythm is not sick from the electrical activity, so look off the monitor for shock, sepsis, or another driver.
Educational only. Follow your current protocols and medical direction.
Simulated waveforms for training only. Not a medical device and not for clinical use.
Switch mode above or below · deltaemergency.com
Vendor neutral on purpose: we teach ECGs and patient assessment, not devices. What you learn here reads the same on whatever monitor or AED your service runs.
A free study aid from Delta Emergency Support Training. This is a simulator, not a diagnostic tool, and not medical direction. Simulated tracings are idealised; real patients are noisier. Always follow your own protocols and medical oversight.
Rhythms come up in EMR training — see the course.Emergency Medical Responder