Conduction in ulnar nerve bundles that innervate the proximal and distal muscles: a clinical trial

<p>Abstract</p> <p>Background</p> <p>This study aims to investigate and compare the conduction parameters of nerve bundles in the ulnar nerve that innervates the forearm muscles and hand muscles; routine electromyography study merely evaluates the nerve segment of distal (hand) muscles.</p> <p>Methods</p> <p>An electrophysiological evaluation, consisting of velocities, amplitudes, and durations of ulnar nerve bundles to 2 forearm muscles and the hypothenar muscles was performed on the same humeral segment.</p> <p>Results</p> <p>The velocities and durations of the compound muscle action potential (CMAP) of the ulnar nerve bundle to the proximal muscles were greater than to distal muscles, but the amplitudes were smaller.</p> <p>Conclusions</p> <p>Bundles in the ulnar nerve of proximal muscles have larger neuronal bodies and thicker nerve fibers than those in the same nerve in distal muscles, and their conduction velocities are higher. The CMAPs of proximal muscles also have smaller amplitudes and greater durations. These findings can be attributed to the desynchronization that is caused by a wider range of distribution in nerve fiber diameters.</p> <p>Conduction parameters of nerve fibers with different diameters in the same peripheral nerve can be estimated.</p

An alternative nerve conduction study method to evaluate early diabetic neuropathy: Ratio of different diameter nerve fibers in peroneal nerve

Different nerve fibers may have disparate conduction parameters even though they are in the same peripheral nerve. Hyperglycemia can have differential effects on nerve fibers, depending on diameter. In diabetes, conventional nerve conduction studies have allowed us to classify a peripheral nerve as normal or not. But, there may be differential involvement in disparate nerve fibers of the same peripheral nerve. This study evaluated the effects of hyperglycemia on nerve fibers of peroneal nerve by diameter. Thirty-five diabetic patients with normal nerve conduction studies and thirty-two healthy controls were included to the study. The peroneal nerve was stimulated from two points (upper and below the fibula head) and recorded from the tibialis anterior (TA) and extensor digitorum brevis (EDB) muscles. Then the ratios of conduction velocity parameters recorded in these sides were compared between the diabetic and control groups. The conduction velocity recorded from EDB seemed to be faster in both groups. But there were no significant differences among the ratios between the groups. Our study has demonstrated the conduction parameters of two nerve fibers with different diameters in the peroneal nerve. The ratios of conduction parameters were similar in both groups, suggesting that fibers in the peroneal nerve are similarly affected by hyperglycemia. © 2015, Research Society for Study of Diabetes in India

Benign Episodic Unilateral Mydriasis (Case Report)

Benign episodic unilateral mydriasis is a descriptive situation with recurrent unilateral mydriasis in adult people especially women with migraine. A 20 year-old man who presented with paroxysmal left pupil mydriasis and diagnosed as benign episodic unilateral mydriasis after the examinations to exclude the other reasons of anisocoria was reported. In such cases to keep in mind the benign causes of mydriasis would be helpful to avoid unnecessary invasive test

Cerebral Venous Thrombosis, A Retrospective Study of 14 Patients and Review of Literature

OBJECTIVE: Cerebral venous thrombosis is thrombosis of brain veins and sinuses which are due to prothrombotic process. They present with various neurological symptoms. The annual incidence is 3- 4/million. METHODS: Symptoms, demographic data, etiologic factors, clinical and radiological features of 14 consecutive patients between July 1st 2006 and July 1st 2008 with cerebral venous thrombosis are evaluated retrospectively. RESULTS: The study group comprised 4 men and 10 women. Their mean age was 44.2±19 years. Headache is the most frequent symptom, present in %92.8 of the patients. Papilloedema (50%), impairment of level of consciousness (14.3%), vertigo (14.3%), visual disturbances (14.3%) were the other symptoms. Eight patients were admitted just because of headache. Seven patients had one and seven patients had more than one sinus involvement. CONCLUSION: The incidence is rare but the outcome of this disorder is generally favourable if diagnosed. Cerebral venous thrombosis must be remembered in the differantial diagnosis of headaches of unknown etiologi

Serebral Palsi rehabilitasyonunda EEG bulgularının prognostik değeri

Prognostic value of EEG findings in cerebral palsy rehabilitation-EEG of 32 cerebral palsy patient who are treated according to the with rehabilitation program by the Bobath technique were evaluated. Patients motor improvement was assessed by motor development test. The difference and monthly improvement scores were compared with EEG findings which is defined between 1-9 points. No correlation was found. On the other hand there were no significant difference also in the motor development parameters if we separete patients into two group according to their EEG's such as normal and abnormal