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- W2321459820 abstract "The ability of an evoked motor response (EMR) with nerve stimulation to detect intraneural needle placement reliably at low current intensity has recently been challenged. In this study, we hypothesized that current intensity is higher in needle-nerve contact than in intraneural needle placement.Brachial plexus nerves were exposed surgically in 6 anesthetized pigs. An insulated needle connected to a nerve stimulator was placed either with 1 mm distance to the nerve (control position), adjacent to nerve epineurium (needle-nerve contact position), or inside the nerve (intraneural position). Three pulse duration settings were applied in random fashion (0.1, 0.3, or 1.0 milliseconds) at each needle position. Starting at 0.0 mA, electrical current was increased until a minimal threshold current resulting in a specific EMR was observed. Fifty threshold current measurements were scheduled for each needle position-pulse duration setting.Four hundred-fifty threshold currents in 50 peripheral nerves were measured. Threshold current intensities (mA) to elicit EMR showed small differences between the needle-nerve contact position [median (25th-75th percentiles); 0.1 milliseconds: 0.12 (0.08-0.18) mA; 0.3 milliseconds: 0.10 (0.06-0.12) mA; 1.0 milliseconds: 0.06 (0.04-0.10) mA] and the intraneural position (0.1 milliseconds: 0.12 [0.10-0.16] mA; 0.3 milliseconds: 0.08 [0.06-0.10] mA; 1.0 milliseconds: 0.06 [0.06-0.08] mA) that are neither statistically significant nor clinically relevant. Regardless of the pulse duration that was applied, the 98.33% confidence interval revealed a difference of at most 0.02 mA. However, threshold current intensities to elicit EMR were lower for the needle-nerve contact position than for the control position (0.1 milliseconds: 0.28 [0.26-0.32] mA; 0.3 milliseconds: 0.20 [0.16-0.22] mA; 1.0 milliseconds: 0.12 [0.10-0.14] mA).The confidence interval for differences suggests minimal current intensity to elicit a motor response that cannot reliably discern between a needle-nerve contact from intraneural needle placement. In addition, an EMR at threshold currents <0.2 mA (irrespective of the applied pulse duration) indicates intraneural needle placement or needle-nerve contact." @default.
- W2321459820 created "2016-06-24" @default.
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- W2321459820 date "2014-03-01" @default.
- W2321459820 modified "2023-10-18" @default.
- W2321459820 title "Minimal Current Intensity to Elicit an Evoked Motor Response Cannot Discern Between Needle-Nerve Contact and Intraneural Needle Insertion" @default.
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- W2321459820 doi "https://doi.org/10.1213/ane.0b013e3182a94454" @default.
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