Dr Ganesh Sivasankara · Consultant Anaesthetist
Most of what I have made outside the operating theatre is here. The apps are free, there is no sign-up and nothing to download, and they open in the browser on a phone. Each one teaches a single subject, usually with a picture you can change, and each one lists its sources on the page.
gundoc9.github.io/reading-the-eeg
A course on the anaesthetic EEG for anaesthesia residents, built around a live trace and spectrogram you can still and read. It starts from what the waves are, works through the drugs and the states of anaesthesia, and ends each module with a short check drawn from its own drills. A primer of thirty-one terms is folded in for anyone starting cold.
gundoc9.github.io/reading-the-clot
The TEG and ROTEM trace for anaesthetists, in seventeen cards: the trace, the defects and the evidence. The five numbers on the trace come first, each drawn on its own. Then every defect shows the normal trace beside the abnormal one and what to give for it, with each picture computed from published medians and thresholds. There are drills, and a plot tab where you type your own numbers and see the trace against the published normal for that age, or for labour.
gundoc9.github.io/cannulation-geometry
There is one knob, the insertion angle, and a tab for each catheter length. The picture shows how deep a vein a given cannula can reach at a given angle and still have most of its length inside the vessel, and why a steep angle with a short cannula leaves so little of it in. Built for residents and fellows who know the clinical side and have not seen the arithmetic.
MRI safety physics for the anaesthetist, written for the paediatric list. Ten cards, from Always on to The quench, with the field drawn as iron filings and computed from the magnet, so you can see where the pull and the twist come from, what the bore does to the ECG, and why the lines and the labels matter. The ten things to remember are on one page for the department wall.
gundoc9.github.io/how-the-ai-works
A dictionary of the terms behind the AI tools we already use at work, one card per term, with a control to move and a plain-English readout. It covers tokens, temperature, context, retrieval, evals and the rest, and it is written for clinicians who have no wish to become engineers.
gundoc9.github.io/before-you-sign
A three-minute exercise in checking an AI scribe's note. You hear a pre-anaesthesia clinic consultation, in Gulf Arabic with transcripts in both languages, then review and sign the English note the scribe wrote from it, marking anything you would not sign. After you sign, the note comes back marked in red, with what was actually said, why each error matters and the source. Your attempt is recorded without your name, for a study of how these notes get checked.
gundoc9.github.io/bp-targets and gundoc9.github.io/glp1-sglt2
The same clinical question put to six AI models, three times each, with every answer drawn as a mark on one scale so the spread is visible at a glance. The first run asked ten questions on blood pressure targets in neonates and children under anaesthesia. The second asked what to do about GLP-1 agonists and SGLT2 inhibitors before surgery, and the page shows how far apart the models are on each question.
gundoc9.github.io/guideline-tracker
What has changed in anaesthesia guidelines over the last two years, one card per change, with a link to the full text where one is open. Every guideline from 2026 is in whether or not a free copy exists. I check for new ones monthly.
I write on LinkedIn about the evidence behind what we do every day, usually one paper at a time, and on Substack at more length about building these tools as an anaesthetist with no training in software.
If you are building something for the operating theatre, I can tell you how it will be used on a busy list, which is often not how it was designed to be used, and where it will get switched off. I have worked in the UK and in a tertiary centre in Saudi Arabia, where I am Section Head of Paediatric Anaesthesia and spent three years running the department's quality work, and I have lately built a few small tools of my own, so I have seen a little of both sides. Write to me if a conversation would help.
Everything above is free to use and to share with your trainees. The apps work best on a phone, and you can add any of them to your Home Screen like an app (the browser's share menu, then Add to Home Screen). If you find a mistake, or a source I have read wrong, write to me and I will fix it and say so on the page. The licence on each app says what you may do with the material in your own teaching.