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- W2004706503 abstract "Objective: To study relationships between median wrist and forearm ultrasonographic measurements and median nerve conduction studies (NCS). Design: Prospective, convenience sample of healthy adults. Setting: Outpatient clinic of an academic center. Participants: Healthy subjects replying to flyer advertisements. Interventions: Following subject screening, median motor NCS and sensory NCS to the index finger were performed using standard published techniques. A second examiner blinded to NCS results used a high-frequency linear-array transducer to measure the cross-sectional area (CSA) of the median nerve at the distal volar wrist crease (carpal tunnel outlet) and forearm (4cm proximally), measured in the transverse plane on static sonographic images. The outer margin of the median nerve was traced at the junction of the hypoechoic fascicles and adjacent outer connective tissue layer. Main Outcome Measures: Median motor nerve compound muscle action potential (CMAP) amplitude, distal latency, and conduction velocity; sensory nerve action potential (SNAP) amplitude and distal latency; ultrasound CSA of the median nerve. Results: 50 median nerves were evaluated in 25 subjects. The amplitude of the CMAP with wrist stimulation was positively related to CSA, with CSA increasing by .00195cm2 for every mV increase in amplitude in the dominant hand (95% confidence interval [CI], .0002–.0037, P<.05) and .00247 in the nondominant (95% CI, .00035–.00459, P<0.05). There was no significant linear association between wrist median CSA and median motor or sensory distal latencies. Conduction velocity through the forearm was not significantly linearly associated with CSA in the forearm, or the ratio of forearm to wrist CSA (tapering ratio). Wrist CSA was inversely related to SNAP amplitude. Conclusions: While associations were found between median NCS amplitudes and ultrasound nerve measures, this was not found with other parameters studied. Studying these relationships may increase our understanding of when to best use these procedures." @default.
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- W2004706503 date "2008-11-01" @default.
- W2004706503 modified "2023-09-26" @default.
- W2004706503 title "Poster 204: Median Nerve High-Resolution Ultrasonographic Measures: Correlates With Median Nerve Conduction Studies in Normal Subjects" @default.
- W2004706503 doi "https://doi.org/10.1016/j.apmr.2008.09.524" @default.
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