It's a good idea but (there's always a 'but' isn't there) there's a couple of issues which need to be considered with such a system. The first one is maintaining the information/keeping it up to date. The problem here is that if the info is incorrect there's the potential for more harm than good to come out of the initial response. Equally if you've got 2 people with the same or similar names again there's a risk of the wrong info being given that could drastically change the outcome of any medical attention given. So, data quality is absolute key and to ensure the system works as required. The second issue would be in relation to the Data Protection Act, security and the legal issues relating to staff disclosure of medical issues. Not being an expert in that area it's something that would have to be looked at in detail before setting up a database of staff medical conditions (if you're in a unionised workplace it could be particularly contraversial). If I were to recommend a system it would be the In Case of Emergency (ICE) tags that are attached to helmets. With this system being used the info is entered by the member of staff and is available there and then by the first responders. The only issues I can see with this system is ensuring that staff are issued and only use their own PPE and that they periodically check the details to keep them up to date.

Minefield is the word that springs to mind. You could do it providing those with I'll health agree to it but where are you going to keep the information? If its on general display or accessed by everyone you may have problems. A paramedic may request the information, and it will be useful to them, but it is not going to stop them carrying out the necessary measures to save life. they would expect those at risk to carry the information on them. You also need to consider how you will keep this data current to ensure that your information does not lead the paramedics and doctors down a wrong path of treatment. There are enough devices that can be purchased to allow medical information to remain private whilst informing paramedics of any issues. For example those on warfarin will be issued with an orange card to carry in their purse or wallet.

One of my previous employers used to encourage employees with specific health issues to wear an SOS medallion or bracelet which contained information about their condition which would be there for the emergency services to access when needed.

It may be easier to train your first aiders or first responders to assess the patient to the same or similar standard... If you go down the corporate recording route, for all the right reasons I might add, however there will be individuals that may be economic with what they feel comfortable telling their employers.