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Characteristics of forearm mixed nerve conduction study in carpal tunnel syndrome: Comparison with ultrasound assessments |
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| Affiliation: | 1. Department of Neurology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea;2. Department of Neurology, Myung Diagnostic Radiology Clinic, Seoul, Republic of Korea;1. Department of Radiology, the Royal Melbourne Hospital, Parkville, VIC, Australia;2. Department of Radiology, the University of Melbourne, Parkville, VIC, Australia;3. Department of Pathology, the Royal Melbourne Hospital, Parkville, VIC, Australia;1. Department of Neurosurgery, Nagoya University, Graduate School of Medicine, Nagoya, Aichi, Japan;2. Nagoya University Hospital, Center for Advanced Medicine and Clinical Research, Statistical Analysis Section, Nagoya, Aichi, Japan;1. Department of Neurological Surgery, University of Washington, Seattle, WA United States;2. Department of Radiology, University of Washington, Seattle, WA, United States;3. Department of Mechanical Engineering, University of Washington, Seattle, WA, United States |
| Abstract: | This study aimed to characterize forearm mixed nerve conduction study (NCS) findings in carpal tunnel syndrome (CTS). Eighty-two patients with CTS and 48 healthy controls were enrolled. We directly compared the forearm mixed NCS and ultrasonography results from CTS patients with those from the controls. Correlation analyses were performed to identify the relationship between forearm mixed NCS parameters and ultrasound measurements in CTS. We observed reduced forearm mixed nerve amplitude and increased cross-sectional area (CSA) of the median nerve at the proximal carpal tunnel (CT) inlet in CTS. The forearm mixed nerve amplitude negatively correlated with the CSA at the proximal CT inlet. We found a negative correlation between Bland's neurophysiological grade and the forearm mixed nerve amplitude as well as a positive correlation between the CSA of the median nerve at the proximal CT inlet and Bland's neurophysiological grade. We confirmed that the reduced median mixed nerve amplitude is the distinguishing feature of forearm mixed NCS in CTS. Our findings suggest that the forearm mixed NCS is potentially useful in evaluating its severity. |
| Keywords: | Carpal tunnel syndrome Median nerve Retrograde axonal degeneration Forearm mixed nerve conduction study Ultrasound |
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