頁籤選單縮合
題名 | Electrophysiological Study of Carpal Tunnel Syndrome |
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作者 | Tseng, Chun-hung; Wang, Pao-yu; | 書刊名 | Acta Neurologica Taiwanica |
卷期 | 9:3 民89.09 |
頁次 | 頁215-221 |
分類號 | 416.26 |
關鍵詞 | Carpal tunnel syndrome; Distal latency; Sensory nerve action potential; |
語文 | 英文(English) |
英文摘要 | Carpal tunnel syndrome (CTS) was a common mononeuropathy. It is often caused by focal entrapment of the median nerves at the wrists with an increased of pressure in the carpal tunnel. There are some limits in the evaluation of the early CTS using conventional electrodiagnostic techniques. We tried to evaluate the sensitivity and specificity of different electrophysiological parameters for the diagnosis of CTS. We measured several parameters during this study. The parameters included distal latencies (DL) and amplitudes (AMP) of sensory nerve action potentials (SNAP) in the writs-digit and palm-digit segments of median sensory nerves, DL and AMP of SNAP in the wrist-digit segments of the ulnar sensory nerves, the latency differences between the wrist-digit and palm-digit conduction of median sensory nerves (Δt1), and absolute values of the latency differences between the wrist-digit conduction of median and ulnar sensory nerves (Δt2). Then we evaluated the sensitivity and specificity of these parameters in patients with CTS. We chose the cut-off values of 4.0 msec, 2.70 msec, 1.81 msec and 0.47 msec for the DL of wrist-digit conduction of median sensory nerves (DLMW), DL of palm-digit conduction of median sensory nerves (DLMP), Δt1, and Δt2. The sensitivities of DLMW, of DLMP, of Δt1, and of Δt2 were 85.7 %, 48.6 %, 46.4 % and 80.0 % respectively. The specificities of DLMW, of DLMP, of Δt1, and of Δt2 were 100%, 95.7 %, 98.9 % and 96.8 % respectively. The “clinical” CTS was defined as patients with hands with positive clinical symptoms, but with normal DLMW (DL < 4.0 msec). Fifteen percent and 20 % of the affected hands of the “clinical” CTS had abnormal DLMP and Δt2, respectively. With the higher sensitivities and specificities, the DLMW and Δt2 were most valuable during the electrophysiological diagnosis of CTS. Our results also suggested that with the additional electrophysiological study of DLMP, Δt1, and Δt2, we will be able to detect “clinical” CTS at earlier stages than is possible at this time. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。