UX/UI implications of user working under stress/time pressure

In UCD, it is often mentioned that the context of usage of the app is very important for designer to keep in mind. I am designing a decision support system application for field healthcare workers that don't have a lot of time for every session, and on the hand need to be precise with what they mark on the app. Of course, I understand that in terms of usability, that means I need to set efficiency goals and benchmarks and verify them through usability tests. I wonder, though, what are additional measures I should consider when designing the UI/UX. This is what I came up with so far:

• Clear spatial orientation of the app - every element has its place, consistent through the screens.
• Big fonts; big clickable areas for radio buttons/checkboxes;
• Clear emphasis on the important things (symptoms/warnings)

Anything else that I'm missing here?