AI Article Synopsis
- This study evaluated how effective motor responses are in detecting contact between catheters and nerves using ultrasound as a reference.
- In a trial involving 25 patients, stimulating catheters were used, and muscle contractions were measured as the current increased; a 0.5 mA threshold was established.
- The findings showed that only 64% of patients responded at this current level, indicating that a lack of muscle response does not confirm there is no contact between the catheter and nerve.
Article Abstract
Background: We determined the sensitivity of motor responses evoked by stimulating catheters in determining catheter-nerve contact using ultrasonography as reference.
Methods: Femoral nerves were contacted using stimulating catheters under ultrasonography scanning in 25 patients. The output current was increased from its minimum until quadriceps muscle contraction occurred. The sensitivity of the motor response in determining catheter-nerve contact was calculated using 0.5 mA as current threshold.
Results: The current required for catheter stimulation to evoke a motor response ranged between 0.18 and 2.0 mA. Muscle contraction in response to 0.5 mA occurred in 16 of 25 subjects. The sensitivity of motor response for nerve stimulation was 64% (95% confidence interval: 0.43, 0.82).
Conclusions: The absence of muscle responses at a stimulating current≤0.5 mA does not necessarily indicate the absence of catheter-nerve contact.
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| http://dx.doi.org/10.1213/ANE.0b013e31822c9887 | DOI Listing |
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