A microshock Geoff is a small electrical shock around 10uA which when applied to the heart can lead to cardiac arrest. Although this current does have to pass through the heart so I'd be surprised if an Enuresis could cause this. (are class CF Enuresis alarms available?)
If you have access to Web of Science or know someone with Athens access there's a lot available on the subject of microshocks, but these are dealing more with the risks from electrosurgical equipment during surgery or indirect shocks from HV use like working on overhead lines.
