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11 Cards in this Set
- Front
- Back
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Sensory EP |
Recorded from Cns after sensory/ PNS |
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Motor EP |
Recorded from muscle after motor cortex stimulation |
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Evoked potential |
Evoked potential/ evoked response is an electrical potential recorded from a nervous system following presentation of a stimuli |
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Spont potential |
Include EEG, EMG etc |
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Low amplitudes |
Averaging is required to eliminate errors |
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Signals recorded from |
Cerebral cortex Brain stem Spinal cord Peripheral nerves |
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Types |
Sensory - auditory ear Somatosensory-PN Tactile/electrical Motor |
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Clinical use |
•In surgical procedure associated with possible neurological injury Spinal fusion with instrumentation Spinal cord tumour resection Brachial plexus repair Thoraco abd aortic aneurysm repair Epilepsy surg Cerebral tumour resection • Facilitates probe localisation in stereotactic surgery |
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Contraindications |
SEP no abs cx Limited availability of monitoring equipment Trained personnel MEP Cx in retained intracranial metal Implantable device After seizure or major cranial insult Can produce brain injury due to repetitive stimulation of cortex & can induce seizures |
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Commonly measured |
Brain stem auditory evoked potential SEP MEP |
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Clinical considerations |
Altered by variables During monitoring foll is kept constant A- physiological Temp/BP/O2 saturation B- Pharmacological Constant depth of anesthesia Constant muscle relaxation In GA balanced technique with n2o NDMR and opioids cause minimum changes Volatile agents are used at constant low dose or avoided High dose BZD also avoided |
