Some of the best hospital clients I've had have been doctors who are smart enough to understand that info tech knowledge is almost as important to them as medical knowledge. If you spend the time with them to advise on how to best implement their ideas for new systems/processes then you can end up with the best possible win/win result.

That said, you have to know what you are talking about or admit you don't. Doctors are used to being mislead by the best, and if you try to mislead or bullshit them they will know and you've lost their trust. Admit when you don't have in depth knowledge about what they are asking for and they will respect you for it. In a lot of cases you may be able to learn from them, as there interest is specific when you will have to deal with the entire environment.

The other important thing is don't waste their time. A lot of Doctors are working 18 to 20 hour days, and don't have time for you to be disorganised. If something is going to take a long time to do, then tell them so they can plan around the job. If a quick task suddenly looks like it's going to take longer, let them know as soon as you can so they can plan.

Keep at the top of your mind that the clinical staff you are supporting are their to save the lives of real people, they are not there at your convivence. Remember one day you will be a patient and you don't want your doctor to have to stuff around with a unhelpful IT specialist.