Utilizing Longer Intramuscular Needle Pair Electrodes: What are we Missing in Our Intraoperative Muscle Recordings?

(Paper was presented by Dr. Faisal Jahangiri at the 2015 annual meeting of the American Society of Neurophysiological M...

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(Paper was presented by Dr. Faisal Jahangiri at the 2015 annual meeting of the American Society of Neurophysiological Monitoring (ASNM) in Chicago, Illinois. It received a Lead Author-Scientific Achievement Award from the ASNM research committee). Dr. Jahangiri also presented this paper at the 2015 annual meeting of the American Neurodiagnostic Society (ASET) in Weston, Florida.
Objective: This study illustrates the benefit of utilizing longer 37mm and 50mm intramuscular needle pair electrodes for recording Transcranial electrical Motor Evoked Potentials (TCeMEP) in Rectus Femoris (RF) muscle during various surgeries in obese patients, as opposed to the regularly used sub-dermal 13 mm needle electrodes, which can miss muscle activity (EMG) due to presence of adipose tissue.  The 37 mm and 50mm intramuscular needle pair electrodes increased accuracy and reliability of TCeMEP recording at lower stimulation thresholds.