Sensory Nerve Fiber Composition Chart
The Neurometer® CPT procedure is the only neurodiagnostic procedure that can quantify sensory nerve function abnormalities from the hyperesthetic through the hypoesthetic/anesthetic stages in the large myelinated, small myelinated and unmyelinated sensory fibers. The chart above illustrates the findings from sNCT/CPT studies conducted on a group of 63 diabetic patients. Three neuroselective CPT measures were collected from three different sites (face/trigeminal n., finger/median n., toe/peroneal n.) for a total of 9 CPT measures from each patient. The chart shows that of those patients with only a single abnormal CPT measure (n=10), 50% had a single hyperesthetic measure and 50% had a single hypoesthetic measure. As the number of abnormal CPT measures per patient increased - reflecting increasing levels of diabetic neuropathy - the percentage of abnormal CPT measures in the hypoesthetic stage increased while the percentage of hyperesthetic measures decreased.
The unique ability of the Neurometer® sNCT/CPT evaluation to quantify neuropathies from the earliest hyperesthetic stages enables much earlier detection than traditional electrodiagnostic nerve tests. In addition to monitoring neuropathy, the Neurometer® sNCT/CPT evaluation has also proven valuable in monitoring the hyperesthesia associated with early nerve regeneration following surgery. Click here for a link to a document with additional information about hyperesthesia and the Neurometer evaluation.