Healthcare facilities must maintain electrical equipment if it can cause danger. It is ultimately the role of the manager to decide what level of maintenance is needed according to the risk of an item becomign faulty. See the CQC website for further information on PAT Testing.
The World Health Organisation's definition of medical equipment
"Medical devices requiring calibration, maintenance, repair, user training and decommissioning – activities usually managed by clinical engineers. Medical equipment is used for the specific purposes of diagnosis and treatment of disease or rehabilitation following disease or injury; it can be used either alone or in combination with any accessory, consumable or other piece of medical equipment. Medical equipment excludes implantable, disposable or single-use medical devices."