MethodThe subjects were 79 hemiplegic stroke patients (39 males, 40 felames, mean age 61.9 years). We measured the BMD of the subjects, compared the BMD of affected sides with that of unaffected sides, and evaluate the BMD in connection with stroke duration and affected sides.

ResultsThe reduction of the BMD in affected sides was highly correlated with the duration of hemiplegia, but the correlation was not shown in the case of those in unaffected sides. In addition, the difference of BMD in affected sides between those in unaffected sides had an obvious negative correlation with the stroke duration of left hemiplegia, but not with that of right hemiplegia.

ConclusionStroke patients have a high prevalence of osteoporosis and this findings were particularly prominent in people who suffer from left hemiplegia. Early rehabilitative care, including weight-bearing exercise and outdoor ambulation, is essential for left side hemiplegic patients in order to prevent possible complications.

Method: Sciatic nerve of seventy rats was compressed with haemostatic forceps. The experimental group was divided into 4 subgroups according to the intensity and duration of injury: group 1, first degree compression for 5 seconds; group 2, first degree for 30 seconds; group 3, third degree for 5 seconds; and group 4, third degree for 30 seconds. Treadmill exercise was done for either 30 minutes or 2 hours a day, 5 days a week for 4 weeks. Histochemical study of soleus was done before nerve compression and 1 week, 4 weeks after compression.

Results: The fiber diameter of soleus was larger in the experimental group at 4 weeks (p＜0.05). The intensity of injury had greater impact on the recovery of fiber diameter than the duration. Thirty minute exercise was seen to have a earlier recovery of fiber diameter than 2 hours.

Conclusion: These results may provide the basic data to clarify the neurological recovery in relation to the severity of injury, and to help establishing adequate duration of exercise after nerve damage.

Objective: To demonstrate a conduction block of the median nerve at the flexor retinaculum (FR) in carpal tunnel syndrome (CTS), comparison of potentials obtained with stimulation of median nerve at the wrist and the palm may be required.

Method: To determine the severity and incidence of conduction block in patients with CTS, seventy hands of neurologically healthy adults (mean age, 48 years) as control, and seventy hands of patients with CTS (mean age, 51 years) were tested. We performed median motor and middle finger recorded antidromic sensory conduction study with stimulation of the wrist and palm of a distance of 5 cm. The negative peak spike duration and baseline to peak amplitude of the compound muscle action potential (CMAP), and sensory nerve action potential (SNAP) with wrist and palm stimulations were measured. From these values, the wrist to palm duration ratio and amplitude ratio were obtained.

Results: The criteria of median motor nerve conduction block were a wrist to palm amplitude ratio of less than 0.7 and a wrist to palm duration ratio of less than 1.13. The criteria of median sensory conduction block were a wrist to palm amplitude ratio of less than 0.61 and a wrist to palm duration ratio of less than 1.33. In the patient group, 10 hands (14.3%) showed motor conduction block and 12 hands (17.1%) showed sensory conduction block and 3 hands (4.3%) showed both. The wrist to palm amplitude ratios of CMAP and SNAP in the patient showing conduction block were 0.6⁑0.1, and 0.4⁑0.2, respectively. There was no correlation between palm CMAP or SNAP amplitude and respective wrist to palm ratios.

Conclusion: Comparison of the amplitude and duration of CMAP or SNAP obtained with stimulation of both wrist and palm may be able to differentiate between conduction block and axonal degeneration. These values may be useful in planning treatment and predicting outcome.