[Telemedicine: Who, what, with what aids, where, why, how, when?]

Telemedicine can be defined as the practice of medicine or surgery via telecommunication interposition using technologies which permit the exchange of medical information and the application of medical care at a distance. Geographic separation, logistical problems which impede the delivery of care, extreme climactic conditions, artificial environments, or a combination of these parameters may all influence the health of patients and the ability of healthcare professionals to do their work effectively. This article reviews the standards of current telemedical and telesurgical systems, defines target groups who may benefit from such care, and details the technologic requirements of telemetry; it uses selected cases and a review the medical literature. The conclusion focuses on future developments and the potential for further improvements through ongoing research.