Sensory-motor index is useful parameter in electroneurographical diagnosis of carpal tunnel syndrome (original) (raw)
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International journal of scientific research, 2019
BACKGROUND: Patients with Mild Carpal tunnel syndrome (CTS) may not be picked up by routine nerve conduction methods. So, this study was performed to identify the most sensitive way to detect mild to moderate Carpal tunnel syndrome and to evaluate the sensitivity of different methods for diagnosis of carpal tunnel syndrome. MATERIAL AND METHOD: We included sixty clinically confirmed CTS patients in our study. We recorded the clinical characteristics and laboratory features in a proforma. We also included sixty healthy age and sex-matched asymptomatic individuals as controls in our study. We excluded patients with underlying peripheral neuropathy. We included Median distal motor latency, Median distal sensory latency, Median-versusulnar 2nd Lumbrical-interossei comparison study, Median-versus-ulnar wrist-to-digit four comparison study, Median-versus-Radial thumb sensory study, Median-versus-ulnar motor distal latency difference, and Median-versus-ulnar sensory latency difference tests in our study. RESULTS: Out of sixty patients, female: male ratio was 2.3:1, and the mean age was 44.28±11.41 years. The mean symptom duration was 0.76±0.03 years. Out of 42 females, 38(90.4%) were engaged in daily household activities. In patients group median nerve distal motor latency was 5.024±2.05 ms, whereas sensory latency was 3.53±0.75 ms. We found maximum sensitivity in Median-versus-ulnar wrist-to-digit four comparison study (90.19%). In Median-versus-Radial thumb sensory study sensitivity was 88.23%, followed by Median-versus-ulnar 2nd Lumbrical-interossei comparison study (86.27%). We found lowest sensitivity (72.55%) in Median distal motor latency test. CONCLUSION: Electrophysiological tests including Median-versus-ulnar wrist-to-fourth digit comparison study, and comparative study of Median-versus-ulnar 2nd Lumbrical-interossei should be included to diagnose mild CTS patients with normal Median distal motor latency, and median distal sensory latency tests. KEYWORDS carpal tunnel syndrome, median nerve, electrophysiological tests INTRODUCTION: Carpal tunnel syndrome (CTS) is caused due to entrapment of the median nerve at the wrist, as it passes through the carpal tunnel. Women are more often affected as compared to men, and it usually [1] involves dominant hand first. CTS is clinically characterized by pain and paresthesias over the lateral palm and the lateral 3 fingers. These paresthesias may result in a disturbed night time sleep, and patient usually shakes hands to get rid of them. If symptoms are not present in lateral 3 fingers, it is unlikely to [2] be CTS.
Journal of neurosciences in rural practice
The purpose of the study is to determine whether the clinical profile of patients with carpal tunnel syndrome (CTS) has been same over the years with the help of routine and comparative electrodiagnostic tests. A prospective study of 100 patients with suspected CTS was conducted without controls. Three provocative maneuvers were performed. Routine and comparison nerve conduction tests were performed, i.e., second lumbrical interossei motor latency difference (2 LIMLD), digit 4 median-ulnar sensory latency difference (D4MUSLD), palm wrist distal sensory latency difference (PWDSLD), and digit 1 median-radial sensory latency difference (D1MRSLD). Data entry, analysis, and statistical evaluation were done using International Business Machines Corporation Statistical Package for the Social Sciences statistics package (IBM, SPSS). A total of 195 hands of 100 patients met the criteria for CTS. Forty-three percentage of patients were homemakers. Considering the rapidly changing communicatio...
Rheumatology International, 2004
To compare the sensitivity of different electrodiagnostic tests on the same hand affected by mild carpal tunnel syndrome (CTS), 189 hands with the clinical diagnosis of CTS and 61 hands of healthy persons were evaluated prospectively. On all hands, median sensory studies from digits 1, 2, 3, 4, and the palm-towrist segment from digit 3 and medial motor latency were recorded. Sixty-two hands with delayed motor latency (>4.2 ms) were excluded to ensure that only mild cases were enrolled. Sensory median-radial latency differences from the thumb, median-ulnar latency difference between second and fifth digits, and median-ulnar latency difference from the fourth digit were calculated in each limb. Sensory studies of only one median innervated digit failed to diagnose 15-20% of hands. Conduction velocity at the palm-to-wrist segment was the most sensitive, diagnosing 99% of cases. In comparative tests, median radial sensory latency difference from the first digit was the most sensitive (94%), and median ulnar latency difference from the fourth digit was the least (85%) sensitive. Segmental measurement has the highest diagnostic yield and may be used first in the evaluation of CTS.
Electrophysiological studies in mild idiopathic carpal tunnel syndrome
… and Motor Control, 1998
Many techniques have been reported to improve the diagnosis of carpal tunnel syndrome (CTS), but there is no agreement on the diagnostic yield of these different methods. We used an electrophysiological protocol including the assessment of the orthodromic sensory conduction velocity of the median nerve along the carpal tunnel, comparison of median and ulnar sensory conduction between the ring finger and wrist, short segment incremental median sensory nerve conduction across the carpal tunnel recording from the III digit ('inching test'), the study of the refractory period of transmission (RPT) and calculation of the distoproximal ratio obtained by dividing the nerve conduction velocity in the median nerve between the third digit and the palm and between the palm and wrist in 41 patients with mild CTS (75 symptomatic hands) and in 45 control subjects. The distoproximal ratio calculation was the most sensitive technique (81%), but was also the least specific. The 'inching test', even though less sensitive, had the advantage of localising focal abnormalities of the median nerve along the carpal tunnel. RPT was abnormal in patients with recent symptoms. Combining the different techniques, an overall sensitivity of 92% was reached, 11% higher than the yield of the single best test suggesting that a multimodal approach could be useful. The best procedure for electrodiagnosis of mild CTS was to combine the median/ulnar comparison test with calculation of the disto-proximal ratio.
Electrodiagnostic evaluation of carpal tunnel syndrome
Muscle & Nerve, 2011
Carpal tunnel syndrome (CTS) is the most common nerve entrapment. Electrodiagnostic (EDX) studies are a valid and reliable means of confirming the diagnosis. This monograph addresses the various EDX techniques used to evaluate the median nerve at the wrist. It also demonstrates the limitations of EDX studies with a focus on the sensitivity and specificity of EDX testing for CTS. The need to use reference values for populations such as diabetics and active workers, where normative values differ from conventional cutoffs used to confirm suspected CTS, is presented. The value of needle electromyography (EMG) is examined. 44: 597-607, 2011 Carpal tunnel syndrome (CTS) is a clinical syn-Abbreviations: AANEM, American Association of Neuromuscular and Electrodiagnostic Medicine; AAOS, American Academy of Orthopedic Surgeons; APB, abductor pollicis brevis; CMAP, compound muscle action potential; CSI, combined summary index; CTS, carpal tunnel syndrome; EDX, electrodiagnostic; EMG, electromyography; inching, median sensory short segment stimulation across the wrist; MGA, Martin-Gruber anastomosis; MMW, median mononeuropathy at the wrist; NAP, nerve action potential; NCS, nerve conduction studies; palmdiff, median-ulnar mixed nerve palm latency difference from palm to wrist; ringdiff, median-ulnar sensory latency difference to the ring finger; SNAP, sensory nerve action potential; thumbdiff, median-radial latency difference to the thumb
Toward sensitive and specific electrodiagnostic techniques in early carpal tunnel syndrome
Egyptian Rheumatology and Rehabilitation, 2018
Context There remains no gold standard or even true agreement among clinicians as to which electrophysiological tests are most important and most relevant particularly in the mild and early carpal tunnel syndrome (CTS). Aim The aim of this study was to determine the sensitivity and specificity of electrodiagnostic (EDX) techniques to confirm the clinically diagnosed patients with mild CTS. Patients and methods This is a descriptive study. A total of 109 hands (68 right hands and 41 left hands) with symptoms consistent with mild idiopathic CTS, as well as 100 hands from controls, were clinically examined and underwent EDX evaluation. Results The ring-difference and thumb-difference had the highest sensitivity, with the distal sensory latency (DSL) of the median nerve coming next. Combined sensory index (CSI) test at a cutoff point more than 1.1 had 100% specificity and positive predictive value. Abnormal DSL of the median nerve had the best negative predictive value. In patients with early and mild CTS and with normal distal motor latency and DSL, the CSI at cutoff point more than 1.1 is the best EDX test that is able to detect most of these patients. Conclusion CSI and its individual components appear as the best EDX tests that help in the diagnosis of patients with early and mild idiopathic CTS.
Muscle & Nerve, 1993
The sensitivity and specificity of nerve conduction studies (NCS'sJ and electromyography (EMG) for the diagnosis of carpal tunnel syndrome CTS) were evaluated by a critical review of the literature. With a search of the medical literature in English through May 1991, 165 articles were identified and reviewed on the basis of six criteria of scientific methodology. The findings of 11 articles that met all six criteria and the results of 48 additional studies that met four or five criteria are presented. We concluded that median sensory and motor NCS's are valid and reproducible clinical laboratory studies that confirm a clinical diagnosis of CTS with a high degree of sensitivity and specificity. Clinical practice recommendations are made based on a comparison of the sensitivities of the several different median nerve conduction study (NCS) techniques.
Study of Carpal Tunnel Syndrome Using Electroneurography and Ultrasound in a Spanish Cohort
Japan Journal of Research, 2024
Introduction: Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy. Its diagnosis is clinically supported by the electroneurography (ENG). The use of ultrasound (US) has increased in recent years. Our objectives are: to describe the ENG and US findings in patients with suspected CTS, based on age, sex and anthropometric data; and to study the correlation of both tests based on the severity of CTS. Material and methods: prospective study of patients with suspected CTS who undergo ENG and US. ENG examination: antidromic sensory median at 3rd and 4th finger; distal motor of median. US: crosssectional area (CSA) prior to or within the tunnel (higher values). Inclusion criteria: patients aged 18 to 85 years. Exclusion criteria: previous trauma or previous surgery for CTS or forearm, carpus or hand. Statistical study with the SPSS 29.0 program.
Premotor Potential Study for Diagnosis of Carpal Tunnel Syndrome
The Tokai journal of experimental and clinical medicine, 2016
The second lumbrical-interossei latency difference test (2LINT) is used frequently for electrodiagnosis of carpal tunnel syndrome (CTS). A premotor potential observed with 2LINT has been identified as a median-nerve sensory nerve action potential. We evaluated the utility of the premotor potential latency analysis (i.e., premotor potential study; PPS) for CTS electrodiagnosis. Sensitivity, specificity, and percentage "no evoked response" (%NER) values were compared prospectively among PPS, median-nerve sensory nerve-conduction studies (NCSs) for digits 1, 2, and 4, and palmar mixed NCS. Sixty-four healthy control hands and 104 hands with CTS were enrolled in this study. PPS sensitivity was superior to other sensory/mixed NCSs (75% vs. 42%-62%). All NCS specificities were acceptable (95%-97%). The %NER of PPS was lower than that of other NCSs (13% vs. 25%-44%). Premotor potential could be evoked in more CTS hands and was the most sensitive among median-nerve sensory and mix...
Neurophysiological classification and sensitivity in 500 carpal tunnel syndrome hands
Acta Neurologica Scandinavica, 2009
Neurophysiological classification and sensitivity in 500 carpal tunnel syndrome hands. Acta Neurol Scand 1997: 96: 211-217. 0 Munksgaard 1997 Objectives -To evaluate the following points about carpal tunnel syndrome (CTS): 1) characterization of a wide population; 2) sensitivity of electrodiagnostic tests, and particularly the contribution of disto-proximal ratio test; 3) validity of a neurophysiological classification developed by us.