Detection of intraneural needle-placement with multiple frequency bioimpedance monitoring: a novel method

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• 作者：Håvard Kalvøy ; Axel R. Sauter
• 关键词：Bioimpedance ; Monitoring ; Needle ; Nerve ; Nerve stimulation ; Regional anaesthesia
• 刊名：Journal of Clinical Monitoring and Computing
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：30
• 期：2
• 页码：185-192
• 全文大小：2,524 KB
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Anesthesiology
  Intensive and Critical Care Medicine
  Statistics for Life Sciences, Medicine and Health Sciences
  
• 出版者：Springer Netherlands
• ISSN：1573-2614

文摘

Electrical impedance measurements have been used to detect intraneural needle placement, but there is still a lack of precision with this method. The purpose of the study was to develop a method for the discrimination of nerve tissue from other tissue types based on multiple frequency impedance measurements. Impedance measurements with 25 different frequencies between 1.26 and 398 kHz were obtained in eight pigs while placing the tip of a stimulation needle within the sciatic nerve and in other tissues. Various impedance variables and measurement frequencies were tested for tissue discrimination. Best tissue discrimination was obtained by using three different impedance parameters with optimal measurement frequencies: Modulus (126 kHz), Phase angle (40 kHz) and the Delta of the phase angle (between 126 and 158 kHz). These variables were combined in a Compound variable C. The area under the curve in a receiver operating characteristic was consecutively increased for the Modulus (78 %), Phase angle (86 %), Delta of the phase angle (94 %), and the Compound variable C (97 %), indicating highest specificity and sensitivity for C. An algorithm based on C was implemented in a real-time feasibility test and used in an additional test animal to demonstrate our new method. Discrimination between nerve tissue and other tissue types was improved by combining several impedance variables at multiple measurement frequencies.