By: Michael Kerr

Gas Guide is a simple anaesthetics reference app most suited to junior doctors in anaesthetic rotations or training. It’s free, has decent content, and as alluded to in its name, is best suited as a quick reference. While it’s probably a little too simple to be that useful for physicians further along in their careers, again, it’s free, content is quick to navigate, and I can see myself keeping this on my devices for future use.

As you can see from the main menu below, the design of the app is incredibly simple, yet does not detract significantly from the content.

Topics are meaty enough and include common medication doses, resuscitation algorithms, monitoring, common problems, etc. There’s enough here to make the app feel genuinely useful, and not a one trick pony.

I must stress that the purpose of this app review isn’t to review the minutia of the content since things like antibiotic doses, timing, algorithms etc. will vary based on country and local protocols.


The app is essentially a bunch of minimally formatted text documents that are separated by logical categories/sections. This works well, given the relatively simple content. It’s rather high yield stuff presented in a simple manner, and almost reminds me of flashcards.


I think that this would be very useful for physicians and students new to anaesthetics or critical care. For example, as a medical student preparing for their first few days on a new rotation in theater, it’s worth remembering that, aside from testing your talents as a barista, many attendings like to maintain their pimping skills. Memorizing some of the material in the evaluation of an airway (such as the Mallampati classification and predictors of a difficult bag-mask ventilation) is definitely going to score you brownie points.



I can also see value for non-anaesthetists to use this as a quick reference tool for things that escape daily repetition, such as the section on regional anaesthesia in an emergency department. The Bier block section has a quick and dirty run down on indications, landmarks, technique, troubleshooting and complications.


Keeping in mind the scope of the content in the app, I feel that it would be a worthy addition to any junior physician or student’s collection. In particular, I would suggest that any such junior-level doctor on a critical care rotation might want to have a run through the content here. Given that the app is entirely free and incredibly concise, there’s little reason not to give it a spin.


  • Free


  • Concise content with decent breadth
  • Logically categorized material


  • None, though some pictures or flow diagrams would be nice


  • Some quick and dirty anaesthetic knowledge for free best suited to junior doctors / students.

iTunes Link

This post does not establish, nor is it intended to establish, a patient physician relationship with anyone. It does not substitute for professional advice, and does not substitute for an in-person evaluation with your health care provider. It does not provide the definitive statement on the subject addressed. Before using these apps please consult with your own physician or health care provider as to the apps validity and accuracy as this post is not intended to affirm the validity or accuracy of the apps in question. The app(s) mentioned in this post should not be used without discussing the app first with your health care provider.