Cellular mobile phones may interfere with hospital equipment. We irradiated five representative pieces of equipment using simulated phone signals and frequencies. Two (an oximeter and a syringe pump) were immune to electric fields of up to 40 V m-1. The most susceptible was a physiological monitor which showed effects at 10 V m-1. None of the equipment was affected by fields that could be produced at over one metre from a 2 W mobile phone.
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Robinson et al. (1997) studied this question.