Historic documents often refer to the potential for Micro-Shocks, in their effort to justify following certain practices within medical locations, such as the use of isolated power supplies.
However, I and others have been unable to find any statistical evidence of any deaths or injuries from such phenomenon. If anyone knows of any verifiable statistics concerning Micro-Shock please let me know.
Also if you have any data in general pertaining to unintentional electric shocks where medical electrical equipment is being used this would be useful. However, again I am not sure any exists since medical equipment is so well designed and maintained these days. A tribute to all those who frequent this site!