Repeater F waves: A comparison of sensitivity with sensory antidromic wrist-to-palm latency and distal motor latency in the diagnosis of carpal tunnel syndrome

Neurology ◽  
1987 ◽  
Vol 37 (5) ◽  
pp. 773-773 ◽  
Author(s):  
W. N. Macleod
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Distal Motor Latency ◽  
Motor Latency ◽  
Tunnel Syndrome

scholarly journals When is needle examination of thenar muscle necessary in the evaluation of mild and moderate carpal tunnel syndrome?

2021 ◽  
Vol 67 (4) ◽  
pp. 518-525
Author(s):  
Zuhal Özişler ◽  
Müfit Akyüz
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Spontaneous Activity ◽  
Carpal Tunnel ◽  
Nerve Conduction ◽  
Sensory Nerve ◽  
Symptom Duration ◽  
Thenar Muscle ◽  
Distal Motor Latency ◽  
Motor Latency ◽  
Tunnel Syndrome

Objectives: This study aims to evaluate the predictors of standard nerve conduction study (NCS) parameters in determining the presence of axonal loss by means of spontaneous activity in patients with mild and moderate carpal tunnel syndrome (CTS). Patients and methods: Between May 2015 and April 2018, a total of 118 patients (11 males, 107 females; mean age: 52.3±10.6 years; range, 27 to 79 years) who underwent electrophysiological studies and were diagnosed with CTS were included. Demographic data of the patients including age, sex, and symptom duration were recorded. Electrodiagnostic studies were performed in all patients. All the needle electromyography (EMG) findings were recorded, but only the presence or absence of spontaneous EMG activities was used as the indicator of axonal injury. Results: In 37 (31.4%) of the patients, spontaneous activity was detected at the thenar muscle needle EMG. No spontaneous activity was observed in any of 43 (36.4%) patients with normal distal motor latency (DML). There were significant differences in DMLs, compound muscle action potential (CMAP) amplitudes, sensory nerve action potentials amplitudes, and sensory nerve conduction velocities between the groups with and without spontaneous activity (p<0.05). The multiple logistic regression analysis revealed that DML was a significant independent risk variable in determining presence of spontaneous activity. The most optimal cut-off value for median DML was calculated as 4.9 ms. If the median DML was >4.9 ms, the relative risk of finding spontaneous activity on thenar muscle needle EMG was 13.5 (95% CI: 3.6-51.2). Conclusion: Distal motor latency is the main parameter for predicting the presence of spontaneous activity in mild and moderate CTS patients with normal CMAP. Performing needle EMG of the thenar muscle in CTS patients with a DML of >4.9 ms may be beneficial to detect axonal degeneration in early stages.

Carpal Tunnel Syndrome: Neurophysiological Results of Surgery Based on Preoperative Electrodiagnostic Testing

1997 ◽  
Vol 22 (5) ◽  
pp. 599-601 ◽  
Author(s):  
L. PADUA ◽  
M. LO MONACO ◽  
R. PADUA ◽  
F. TAMBURRELLI ◽  
B. GREGORI ◽  
...  
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Sensory Nerve ◽  
Middle Finger ◽  
Sensory Function ◽  
Distal Motor Latency ◽  
Electrodiagnostic Testing ◽  
Motor Latency ◽  
Tunnel Syndrome ◽  
Results Of Surgery

Fifty-three hands with carpal tunnel syndrome had pre- and postoperative evaluations of median nerve distal motor latency (from wrist to thenar muscles) and orthodromic sensory nerve conduction velocity (from thumb and middle finger to wrist). At 6 months we observed a neurophysiological return to normal in all cases with normal preoperative distal motor latency and in about 50% of the hands with preoperative distal motor latency between 4 and 6 ms. Prolongation of the distal motor latency over 6 ms was not followed by return to neurophysiological normality, although some degree of sensory function was restored in the majority of cases.

Usefulness of Distal Motor Latency Measurement After Palmar Stimulation in Advanced Carpal Tunnel Syndrome

2012 ◽  
Vol 29 (3) ◽  
pp. 260-262 ◽  
Author(s):  
Takako Kanatani ◽  
Hiroyuki Fujioka ◽  
Masahiro Kurosaka ◽  
Masatoshi Sumi ◽  
Kyoko Yamasaki
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Distal Motor Latency ◽  
Motor Latency ◽  
Tunnel Syndrome

scholarly journals Prolonged distal motor latency of median nerve does not improve diagnostic accuracy for CIDP

2021 ◽  
Author(s):  
Emanuele Spina ◽  
Pietro Emiliano Doneddu ◽  
Giuseppe Liberatore ◽  
Dario Cocito ◽  
Raffaella Fazio ◽  
...  
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Diagnostic Accuracy ◽  
Median Nerve ◽  
Carpal Tunnel ◽  
Chronic Inflammatory Demyelinating Polyneuropathy ◽  
Distal Motor Latency ◽  
Motor Latency ◽  
Inflammatory Demyelinating Polyneuropathy ◽  
Tunnel Syndrome ◽  
Median Neuropathy

AbstractCompression of the median nerve at the carpal tunnel can give demyelinating features and result in distal motor latency (DML) prolongation fulfilling the EFNS/PNS demyelinating criteria for chronic inflammatory demyelinating polyneuropathy (CIDP). Accordingly, being carpal tunnel syndrome (CTS) common in the general population, the EFNS/PNS guidelines recommend excluding the DML of the median nerve when DML prolongation may be consistent with median neuropathy at the wrist from CTS. The main aims of this study were to verify whether the inclusion of DML of the median nerve (when consistent with CTS) could improve electrophysiological diagnostic accuracy for CIDP and if the median nerve at the carpal tunnel was more prone to demyelination. We analyzed electrophysiological data from 499 patients included consecutively into the Italian CIDP Database. According to the EFNS/PNS criteria, 352 patients had a definite, 10 a probable, and 57 a possible diagnosis of CIDP, while 80 were not fulfilling the diagnostic criteria. The inclusion of DML prolongation of median nerve did not improve significantly the diagnostic accuracy for CIDP; overall diagnostic class changed in 6 out of 499 patients (1.2%) and electrodiagnostic class of CIDP changed from not fulfilling to possible in only 2 patients (2.5% of not-fulfilling patients). In conclusion, we can infer that excluding DML prolongation of median nerve does not increase the risk of missing a diagnosis of CIDP thus corroborating the current EFNS/PNS criteria.

scholarly journals Sonographic short-term follow-up after surgical decompression of the median nerve at the carpal tunnel: a single-center prospective observational study

2015 ◽  
Vol 39 (3) ◽  
pp. E6 ◽  
Author(s):  
Sueleyman Tas ◽  
Frank Staub ◽  
Thomas Dombert ◽  
Gerhard Marquardt ◽  
Christian Senft ◽  
...  
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Median Nerve ◽  
Carpal Tunnel ◽  
Surgical Decompression ◽  
High Definition ◽  
Distal Motor Latency ◽  
Motor Latency ◽  
Tunnel Syndrome ◽  
The Mean

OBJECT Carpal tunnel syndrome causes increased cross-sectional area (CSA) of the median nerve, which can be assessed by high-definition ultrasonography. It is unclear today, however, whether high-definition ultrasonography may play a role in the postoperative period. This prospective study aimed to determine the natural history of the morphology of the median nerve at the carpal tunnel after surgical decompression assessed by high-definition ultrasonography. METHODS Between October and December 2014, patients with suspected carpal tunnel syndrome who were referred to the authors’ center for peripheral neurosurgery were prospectively enrolled and underwent pre- and postoperative (3 months) high-definition ultrasonography, electrophysiology, and clinical testing. RESULTS Eighty-one patients were enrolled in the study, and 100% were clinically better at the 3-month follow-up. The mean CSA decreased from 14.7 ± 4.9 mm2 to 12.4 ± 3.4 mm2 (mean ± SD, p < 0.0001). The mean distal motor latency decreased from 6.6 ± 2.4 msec to 4.8 ± 1.0 msec (mean ± SD, p < 0.0001). Ninety-eight percent of patients who were available for electrodiagnostic follow-up showed an improvement of the distal motor latency; only 80% had a reduction in the CSA. CONCLUSIONS The authors present the second-largest series of patients with sonographic follow-up after surgical decompression of the carpal tunnel reported in the literature so far. This study, which showed a decrease in size of the median nerve after surgical decompression, suggests that the preoperative increase in median nerve CSA at the carpal tunnel may be due to compression and that enlargement of the median nerve is (partially) reversible.

Age delays the recovery of distal motor latency after carpal tunnel syndrome surgery

2014 ◽  
Vol 156 (7) ◽  
pp. 1335-1339 ◽  
Author(s):  
O. Vyšata ◽  
A. Procházka ◽  
P. Kunc ◽  
M. Kanta ◽  
E. Ehler ◽  
...  
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Distal Motor Latency ◽  
Motor Latency ◽  
Tunnel Syndrome

Relation between distal motor latency delay and sensory action potential absence of the median nerve in carpal tunnel syndrome

2016 ◽  
Vol 148 ◽  
pp. 45-48
Author(s):  
Masahiro Funaba ◽  
Tsukasa Kanchiku ◽  
Yasuaki Imajo ◽  
Hisashi Yamamoto ◽  
Yasuhiro Hiura ◽  
...  
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Action Potential ◽  
Median Nerve ◽  
Carpal Tunnel ◽  
Distal Motor Latency ◽  
Motor Latency ◽  
Sensory Action ◽  
Tunnel Syndrome
Sign in / Sign up

Export Citation Format

Share Document