Tibial Nerve Somatosensory Evoked Potentials in Spinal Cord Hemisection (original) (raw)
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Cortical evoked potentials and somatosensory perception in chronic spinal cord injury patients
Journal of the Neurological Sciences, 1987
The correlation between somatosensory evoked potentials (SEPs) and. sensory perception was studied in 110 patients with traumatic chronic spinal cord lesions. Perception thresholds over the legs for light touch, vibratory sensibility, temperature and thermal pain were tested together with recordings of tibial and peroneal SEPs. Tibial nerve SEPs correlated better with sensory perception than peroneal nerve SEPs. Normal tibial nerve SEPs were not present with absent or trace vibratory sensibility and vice versa. However, we found many exceptions to the correlation between temperature and pain perception and SEPs. Light touch, vibratory sensibility, and SEPs were highly correlated between each other, while temperature and pain perception correlated poorly to these other modalities. This represents an evident segregation of touch perception, vibratory sensibility and SEPs, which are thought to share dorsal columns as a common ascending pathway, and temperature and pain perception known to be related to the spinothalamic system.
Neurourology and Urodynamics, 2009
Objective: Long-latency somatosensory evoked potentials (LL-SEP) provide information on the function of somatosensory cortical structures. Percutaneous tibial nerve stimulation (PTNS) is indicated in the treatment of lower urinary tract dysfunction. Aim of this study was to evaluate LL-SEP in patients with overactive bladder syndrome (OAB) treated by means of PTNS. Methods: Sixteen female patients with a diagnosis of pharmacoresistant OAB underwent PTNS while eight female patients with the same diagnosis underwent sham stimulation. LL-SEP were performed at baseline and at the end of PTNS or sham stimulation. Peak latency and peak to peak amplitude of P80, P100, and P200 waves were measured. Results: Mean latency of P80, P100, and P200 and mean amplitude of P200 did not show any significant change after both stimulation. Mean amplitude of P80 and P100 waves increased significantly after PTNS while it did not vary after sham stimulation. Conclusion: The P80 and P100 amplitude increase might reflect long-term modifications in synaptic efficiency through the somatosensory pathway. The plastic reorganization of cortical network triggered by peripheral neuromodulation can be hypothesized as a mechanism of action of PTNS. Further studies are needed to correlate LL-SEP modifications after PTNS with the success of the treatment.
Electroencephalography and clinical neurophysiology, 1985
Evidence has been obtained for the existence of two separate events occurring in the human spinal cord following posterior tibial nerve (PTN) stimulation. These events can be recorded on the surface in unanesthetized individuals. The first is an ascending wave which is conducted up to the cord at constant velocity and has a relatively short refractory period consistent with a compound nerve action potential. This represents the afferent volley traversing the lumbosacral plexus and the ascending dorsal columns. A second event, the N22/P22 complex, is surface negative on the back and surface positive anteriorly; its amplitude is maximal 5-15 cm above the level of the L4 spine and its peak latency remains constant at all levels. This activity has a relatively long refractory period. These characteristics of N22/P22 indicate that it is a localized synaptically dependent event conforming to a transverse dipole with dorsal negativity and a simultaneous anterior positivity. The N22/P22 is ...
Effect of Tibial Nerve Mobilization on Nerve Conduction Velocity in Diabetic Neuropathy Patient
https://www.ijhsr.org/IJHSR\_Vol.9\_Issue.5\_May2019/IJHSR\_Abstract.033.html, 2019
Background: Diabetic neuropathy is a noteworthy reason for neuropathy worldwide and may prompt removal and inadequacy. Distal symmetrical polyneuropathy presents sensory and autonomic symptoms with predominant involvement of small fibers, evolving with the involvement of sensory large fibers and finally motor fibers in its more severe stages. Sensory disturbance is normally observed, and mostly recognized is the loss of vibration sense at the toes, checked by pinprick, temperature, and light touch sensations. Nerve mobilization is a technique to reduce injuries or to assist in upgrading performance in activities included in the management. It helps in improving the strength. Objective: The aim of the current study was to find out the effect of tibial nerve mobilization on nerve conduction velocity in diabetic neuropathy patients. This was an experimental study using NCV test and nerve mobilization technique. Method: Twenty participants were included between the age group of 50-60 years diagnosed with diabetic neuropathy. Tibial nerve mobilization technique was performed in the participant"s lower limbs, pre and post sensory nerve conduction velocity was assessed. Outcome measure used in this study will be nerve conduction velocity test. Result: The study showed that there was statistically significant difference in the nerve conduction velocity after giving the intervention for three weeks. ("p"= <0.05,"t"= 2.22) Conclusion: The study showed that the SNCV of the dominant limb improved as compared to the pre-intervention SNCV. Thus, this study concluded that tibial nerve mobilization technique canimprove the nerve conduction velocity and helps subside the burning sensation in individuals.
Clinical Neurophysiology, 2008
Objective: Clinical utility of nerve conduction studies (NCS) of the medial plantar and dorsal sural nerves in the early detection of polyneuropathy have already been shown separately. However, at present, there is no data about the combined assessment of these two nerves in distal sensory neuropathy. In the present study, we aimed to evaluate the medial plantar and dorsal sural NCS in a group of diabetic patients with distal sensory neuropathy (DSN) and in healthy controls. Methods: Thirty healthy and 30 diabetic adult patients were included. In all subjects, peripheral motor and sensory NCS were performed bilaterally with surface electrodes on the lower limbs including medial plantar and dorsal sural nerves. In addition, motor and sensory nerves were studied unilaterally on the upper limb. Results: In all patients, nerve action potential (NAP) amplitudes of sural and superficial peroneal nerves were within normal ranges, but in the patient group mean value was significantly lower than in the controls. Among clinically defined 30 DSN patients, medial plantar NAP amplitude was abnormal in 18 (60%) and dorsal sural nerve amplitude was abnormal in 13 (40%) of the patients bilaterally. Additionally, the onset NCV of the dorsal sural nerve was significantly slower in patients than controls (P = 0.038). Evaluation of both of these nerves increased the sensitivity up to 70% in the detection of neuropathy.
Diabetic Neuropathy Influences Control of Spinal Mechanisms
Journal of Clinical Neurophysiology, 2020
Purpose: Comprehensive evaluation of the upstream sensory processing in diabetic symmetrical polyneuropathy (DSPN) is sparse. The authors investigated the spinal nociceptive withdrawal reflex and the related elicited somatosensory evoked cortical potentials. They hypothesized that DSPN induces alterations in spinal and supraspinal sensory–motor processing compared with age- and gender-matched healthy controls. Methods: In this study, 48 patients with type 1 diabetes and DSPN were compared with 21 healthy controls. Perception and reflex thresholds were determined and subjects received electrical stimulations on the plantar site of the foot at three stimulation intensities to evoke a nociceptive withdrawal reflex. Electromyogram and EEG were recorded for analysis. Results: Patients with DSPN had higher perception (P < 0.001) and reflex (P = 0.012) thresholds. Fewer patients completed the recording session compared with healthy controls (34/48 vs. 21/21; P = 0.004). Diabetic symmetr...