Peripheral nerve stimulation under ultrasonographic control to determine the needle-to-nerve relationship.

Objective: To determine the needle-to-nerve distances during electrical nerve location in dogs at different currents and pulse duration using a peripheral nerve stimulator (PNS) under ultrasound control (US), and the minimal electrical thresholds (MET) necessary to obtain a motor response (MR) after achieving needle-to-nerve contact.

Study Design: Prospective in vivo experimental trial in a clinical setting

Animals: Thirty dogs, scheduled for locoregional anaesthesia of the sciatic nerve.

Methods: Needle-to-nerve distance was measured ultrasonographically after obtaining the MR of sciatic nerve with 2, 1 and 0.

Relationship between evoked motor response and sensory paresthesia in interscalene brachial plexus block.

Background And Objectives: This study sought to define the relationship between a paresthesia and a motor response (MR) to electrical nerve stimulation using a peripheral nerve stimulator (PNS) during interscalene block. We sought to determine if at a low amperage (< or =1.0 mA) a MR would precede a paresthesia.