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Methods & systems for intraoperatively monitoring nerve & muscle frequency latency and amplitude

  • US 20070282217A1
  • Filed: 06/01/2006
  • Published: 12/06/2007
  • Est. Priority Date: 06/01/2006
  • Status: Abandoned Application
First Claim
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1. A method for monitoring and assessing the function of an at-risk nerve in a subject during a surgical procedure, comprising the steps of:

  • a. obtaining a baseline spontaneously occurring electromyography activity (sEMG) recording;

    then serially, throughout the procedure, obtaining a plurality of mechanically elicited electromyography activity (mEMG) recordings; and

    therefrom obtaining a plurality of real-time mEMG/sEMG comparisons between the serially obtained mEMG recordings and the sEMG recording;

    b. obtaining a baseline spontaneously occurring nerve action potential (sNAP) recording;

    then serially, throughout the procedure, recording a plurality of mechanically elicited nerve action potential (mNAP) recordings; and

    therefrom obtaining a plurality of real-time mNAP/ sNAP comparisons between the serially obtained mNAP recordings and the sNAP recording;

    c. serially, throughout the procedure, electrically stimulating a (sciatic) nerve portion and following each act of stimulating, obtaining a plurality of electrically elicited compound muscle action potential (eCMAP) recordings, and a plurality of electrically elicited compound nerve action potential (eNAP) recordings; and

    therefrom obtaining a plurality of real-time eCMAP/eCMAP comparisons between the serially obtained eCMAP recordings and a plurality of real-time eNAP/eNAP comparisons between the serially obtained eNAP recordings,wherein the obtained mEMG, sEMG, mNAP, sNAP, eCMAP, eNAP recordings, and the mEMG/sEMG, mNAP/sNAP, eCMAP/eCMAP and eNAP/eNAP comparisons are displayed by means of one or more of a plurality of real-time trend displays, and a processor adapted and configured to receive and store in a plurality of real-time data acquisition buffers the obtained mEMG, sEMG, mNAP, sNAP, eCMAP, eNAP recordings, and receive and store in a plurality of real-time comparison buffers the mEMG/sEMG, mNAP/sNAP, eCMAP/eCMAP and eNAP/eNAP comparisons, said processor being in communication with said real-time trend displays, andwherein said real-time trend displays comprise;

    one or a plurality of baseline data windows wherein one or more baseline data are displayed;

    one or more amplitude waveform windows wherein one or more amplitude waveforms are displayed with respect to time;

    one or a plurality of latency waveform windows wherein one or more latency waveforms are displayed with respect to time;

    one or a plurality of frequency waveform windows wherein one or more frequency waveforms are displayed with respect to time; and

    one or a plurality of real-time digital value analysis windows, wherein recorded analog data converted to digital values are displayed with respect to time, said digital value analysis windows providing a plurality of evaluations in real-time.

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