An objective assessment of nerve stimulators used for peripheral nerve blockade

Abstract

Nerve stimulation is considered by many to be the current 'gold standard' for locating peripheral nerves. Thirteen nerve stimulators were subjected to a battery of tests performed by two independent observers under standardised conditions using a digital oscilloscope, a calibrated resistance and a novel scoring system. Individual scores were assigned for the signal waveform, current intensity, impulse duration, maximum load output and functionality of each nerve stimulator; the maximum score achievable was 20. A score of ≥ 15/20 was achieved by six nerve stimulators: Stimuplex HNS 12™ (B Braun); MultiStim Vario™ (Pajunk); Plexival™ (Medival, Vygon); MultiStim Sensor™ (Pajunk); Plexygon™ (Aryon, Vygon); Stimuplex HNS 11™ (B Braun). Seven nerve stimulators scored < 15/20. Anaesthetists should be aware of the limitations of the nerve stimulator being used. Standardisation of features is desirable when manufacturing nerve stimulators. © 2006 The Authors Journal compilation 2006 The Association of Anaesthetists of Great Britain and Ireland.