[Hereditary motor-sensory neuropathy. II. Electrophysiological studies].

Electrophysiological parameters (conduction velocity, distal latency, amplitude of evoked response) were analysed in two types of sensorimotor hereditary neuropathy isolated on the ground of the values of motor conduction velocity in the median nerve which was 38 m/sec. Using this criterion the studied material of 53 cases could be divided into two groups. Group I of 34 cases in which the mean conduction velocity in the median nerve was 16.2 m/sec, and group II of 19 cases had a mean conduction velocity in the median nerve of 50.7 m/sec. The evaluation of the degree of slowing down of conduction in both types showed similar values in individual cases and in families.