Posts by Tara

ISIN Somatosensory Evoked Potential (SSEP) Recommendations

Click  here to read this beautiful comprehensive document on somatosensory evoked potentials (SSEPs) by the International Society of Intraoperative Neurophysiology (ISIN). Whether you have been doing SSEPs for years and want to refresh your memory or you want to learn about them for the first time, this document has everything about SSEPs you need to…

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When Does Anesthetic Fade Begin To Effect Your Motor Evoked Potentials?

Click here for the journal article: An evaluation of anesthetic fade in motor evoked potential monitoring in spinal deformity surgeries. Background: Though not well researched, in IONM it is known that transcranial motor evoked potentials (TcMEPs) deteriorate gradually in surgeries with general anesthesia. In other words, the threshold to get a TcMEP response will increase…

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Motor Deficits After Consistent TcMEP Responses

For the original paper click the title:  Limitations of Intraoperative Transcranial Electrical Stimulation-Motor Evoked Potential Monitoring During Brain Tumor Resection Adjacent to the Primary Motor Cortex. When you stimulate between C3/C4 the current must travel a further distance. If you are stimulating at high levels that current can bypass the cortex and stimulate deeper structures.…

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Is Neuromonitoring on OLIFs Warrented?

Click here for original paper: Safety of Lateral Interbody Fusion Surgery without Intraoperative Monitoring Background A direct lateral lumbar approach results in psoas and lumbar plexus injury 19%-63% of the time. The mini-open OLIF accesses the disc obliquely, anterior to the psoas muscle. Unlike the lateral lumbar approach, the OLIF does not need to pass through the…

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The Time for SSEPs to Stabilize After an Anesthetic Change

Here’s an oldie and not necessarily a goodie:  Sequential Measurements of the Median Nerve Somatosensory Evoked Potential During Isoflurane Anaesthesia in Children. Background: During anesthesia when the volatile gas is increased there is a lag before the alveolar gas, arterial blood and brain gas concentrations respectively equilibrate.  Until the brain reaches steady-state, the SSEP responses will…

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