[ comparative study of distal latency of Palmar cutaneous branch of Median nerve with its main sensory branch among patients with diabetic neuropathy, carpal tunnel syndrome and normal population]

Background: It was established that nerve conduction studies are very sensitive and reliable in diagnosis of the diabetic neuropathy. In addition, it was known that asymptomatic carpal tunnel syndrome diagnosed by neuroelectrophysiologic study, is common in patients with diabetes. So, they should be differentiated to select appropriate treatment. This study was designed to identify distal latency ratio of palmar cutaneous branch of median to main branch of median [PCDL/MDL] in the normal, diabetic neuropathy and carpal tunnel syndrome [CTS]

Materials and methods: In the analytic, descriptive cross-sectional study, 60 patients with diabetic neuropathy, 60 patients with CTS and 60 normal cases who presented to 501 army medical center in Tehran, included in the study during 2004.The latency of main branch of median and its palmar cutaneous branch was measured by using EMG-NCV device in each patients

Results: The mean distal latencies of main branch of median nerve in normal, diabetic neuropathy and CTS groups were 3.23+/-0.2, 4.48+/-0.29 and4.10+/-0.21, respectively [P<0.05].The mean distal latencies of palmar cutaneous branch of median nerve in normal, diabetic neuropathy and CTS groups were 2.19+/-0.17, 2.81+/-0.12 and 2.25+/-0.18 [P<0.05]. The mean ratio of PCDL/MDL in normal, diabetic neuropathy and carpal tunnel syndrome groups were 0.67+/-0.07, 0.62+/-0.02 and 0.54+/-0.04, respectively [P<0.05].The PCDL/MDL ratio was not statistically depended on sex in each group. In normal and CTS group, PCDL/MDL ratio had direct colerration with age respectively [0.4 and 0.2] [P<0.05]. In patients with diabetic neuropathy, PCDL/MDL ratio had reverse colerration with age [P<0.05, -0.6]

Conclusions: In patients with diabetic neuropathy, the mean PCDL/MDL ratio was more than that in patients with CTS [P<0.05]

comparitive study of distal latency of palmar cutaneous branch of median nerve with its main sensory branch among patients with diabetic neuropathy, carpal tunnel syndrome and normal population

It was established that nerve conduction studies are very sensitive and reliable in diagnosis of the diabetic neuropathy. In addition, it was known that asymptomatic carpal tunnel syndrome diagnosed by neuroelectrophysiologic study, is common in patients with diabetes. So, they should be differentiated to select appropriate treatment. This study was designed to identify distal latency ratio of palmar cutaneous branch of median to main branch of median [PCDL/MDL] in the normal, diabetic neuropathy and carpal tunnel syndrome [CTS]. ln the analytic, descriptive cross-sectional study, 60 patients with diabetic neuropathy, 60 patients with CTS and 60 normal cases who presented to 501 army medical center in Tehran, included in the study during 2004.The latency of main branch of median and its palmar cutaneous branch was measured by using EMG-NCV device in each patients. The mean distal latencies of main branch of median nerve in normal, diabetic neuropathy and CTS groups were 3.23 +/- 0.2, 4.48 +/- 0.29 and4.10 +/- 0.21, respectively [P<0.05].The mean distal latencies of palmar cutaneous branch of median nerve in normal, diabetic neuropathy and CTS groups were 2.19 +/- 0.17, 2.81 +/- 0.12 and 2.25 +/- 0.18 [P<0.05]. The mean ratio of PCDL/MDL in normal, diabetic neuropathy and carpal tunnel syndrome groups were 0.67 +/- 0.07, 0.62 +/- 0.02 and 0.54 +/- 0.04, respectively [P<0.05].The PCDL/MDL ratio was not statistically depended on sex in each group. In normal and CTS group, PCDL/MDL ratio had direct colerration with age respectively [0.4 and 0.2] [P<0.05]. In patients with diabetic neuropathy, PCDL/MDL ratio had reverse colerration with age [P<0.05, -0.6]. In patients with diabetic neuropathy, the mean PCDL/MDL ratio was more than that in patients with CTS [P<0.05].