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The lower subscapular nerve conduction studies and utilisation in brachial plexopathy evaluation
Kumar M Prakash1, Stephanie M C Fook-Chong, Teng H Leoh
1Department of Neurology, National Neuroscience Institute (SGH campus), Singapore General Hospital, Singapore 169608, Singapore. gnrpk@sgh.com.sg
Objective:
To define the optimal nerve conduction study (NCS) method of lower subscapular nerve and evaluate its clinical utility.
Methods:
Thirty healthy adults (8 males) with a mean age of 45.2+/-16.5 (range, 21-75) years were recruited in this study. A total of sixty nerves were studied using the Dantec Counterpoint EMG machine (Dantec, Skovlunde, Denmark). 6 patients with clinical and electrodiagnostic evidence of brachial plexopathy were also evaluated.
Results:
The mean+/-2 standard deviation values of the distal latencies, base-to-peak amplitudes and inter-side amplitude ratio were 2.38+/-0.52 (range, 1.80-2.90) ms, 13.10+/-5.10 (range, 8.70-21.10) mV and 0.93+/-0.12 (range, 0.67-1.00), respectively. There was a significant correlation between the subject age and the base-to-peak amplitudes. All 6 patients with brachial plexopathy had reduced base-to-peak amplitudes as well as inter-side amplitude ratio of less than 0.67 (the normal limits for control).
Conclusion:
The lower subscapular NCS were satisfactorily recordable and well tolerated. It was useful in evaluation of patients with brachial plexopathy.
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