You need to establish what the "patient environment" is. Local definitions may vary, but 1.5 m around the patient may suffice. We always used to reckon it was at least "anything the patient can touch".
And then keep all PC's out of there!
And that goes for printers, CD-players, smart phones, trailing "extension cables", "wall warts" (mains power adaptors), hair dryers, toasters ... and all the rest of that [censored] as well.
@bam :
Ten years on and counting.
