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The thalamus, located between the cerebrum and midbrain, is a nuclear complex connected to the cerebral cortex that influences motor skills, cognition, and mood. The thalamus is composed of 50-60 nuclei and can be divided into four areas according to vascular supply. In addition, it can be divided into five areas according to function. Many studies have reported on a thalamic infarction causing motor or sensory changes, but few have reported on behavioral and executive aspects of the ophthalmoplegia of the thalamus. This study reports a rare case of a paramedian thalamus infarction affecting the dorsomedial area of the thalamus, manifesting as oculomotor nerve palsy, an abnormal behavioral change, and executive dysfunction. This special case is presented with a review of the anatomical basis and function of the thalamus.
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To establish a correlation between the modified Ashworth scale (MAS) and amplitude and latency of T-reflex and to demonstrate inter-rater and intra-rater reliability of the T-reflex of the biceps muscle for assessing spasticity after stroke.
A total of 21 patients with hemiplegia and spasticity after ischemic stroke were enrolled for this study. The spasticity of biceps muscle was evaluated by an occupational therapist using the MAS. The mean value of manual muscle test of biceps muscles was 2.3±0.79. Latency and amplitude of T-reflex were recorded from biceps muscles by two physicians. The onset latency and peak to peak amplitude of the mean of 5 big T-reflex were measured. The examinations were carried out by two physicians at the same time to evaluate the inter-rater reliability. Further, one of the physicians performed the examination again after one week to evaluate the intra-rater reliability. The correlations between MAS and T-reflex, and the intra- and inter-rater reliability of biceps T-reflex were established by calculating the Spearman correlation coefficients and the intra-class correlation coefficients (ICCs).
Amplitude of the biceps T-reflex increased with increasing level of MAS (
Biceps T-reflex demonstrates a good quantitative measurement and correlation tool with MAS for spasticity, and also shows acceptable inter- and intra-rater reliability, which can be used for patients with spasticity after stroke.
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To compare an objective assessment scale for "come-to-sit" in stroke patients with the previously established subjective assessment scales of "performance-based assessment" and the "ability for basic movement scale".
A specifically designed jacket was used to determine the objective degree of assistance needed for patients to perform the task. While patients were sitting up, the investigator evaluated the amount of assistance needed in a fully dependent state (A) and with maximal effort (B). Using this measure, we obtained an objective scale, {(A-B)/A} ×100. In addition, patients were tested in two starting positions: hemiplegic-side lying and sound-side lying. We then compared the objective scale with subjective scales and other parameters related to functional outcomes.
For both starting positions, the objective assessment scale showed high correlation with the previously established subjective scales (p<0.01). Only the hemiplegic-side lying-to-sit objective scale showed a significant correlation with the parameters used to assess functional outcomes (p<0.05). In terms of Brunnstrom stages, only the leg stage showed a significant correlation with the objective "come-to-sit" scale (p<0.01).
The objective scale was comparable to established subjective assessment scales when used by an expert. The hemiplegic-side lying-to-sit maneuver had a high correlation with patient's functional recovery. Specifically, balance and lower extremity function appear to be important factors in the "come-to-sit" activity.
To understand the neural generator of double-peak potentials and the change of latency and amplitude of double peaks with aging.
In 50 healthy subjects made up of groups of 10 people per decade from the age of 20 to 60, orthodromic sensory nerve conduction studies were performed on the median nerves using submaximal stimulation. Various stimulus durations and interstimulation distances were used to obtain each double peak in the different age groups. The latency and amplitude of the second peak were measured. Statistical analyses included one-way ANOVA and correlation tests. p-values<0.05 were considered significant.
When the cathode moved in a proximal direction, the interpeak intervals increased. Second peak amplitudes decreased, and second peak latencies were delayed with aging (p<0.05). In some older people, second peaks were not obtained.
Our experiments indicate that the double-peak response represented the two stimulation sites under the cathode and anode. The delayed latency and decreased amplitude of the second peak that occurs with aging represented peripheral nerve degeneration in aging, which starts at the distal nerve.
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