[Preoperative use of computed tomography for foreign bodies].

Computed tomography, with the possibility of density determination, makes possible the detection of foreign bodies that are not visible when using conventional techniques. The possibilities of localization are improved by the fact that tomograms are free of shadows and that distances can be measured exactly. These advantages provide important information in those cases in which surgical operation is planned.

Clinical experience with iopamidol for myelography.

Within 20 months 145 ascending thoracocervical myelographies and 155 lumbar myelographies with the nonionic water-soluble contrast medium iopamidol were performed. The iodine concentration given was 250 mg I/ml or 200 mg I/ml respectively. The total iodine never exceeded 2.

Qualitative H-reflex testing in huntington's disease.

The occurrence of H-reflexes over both the anterior tibial muscle and the thenar muscle on both sides was investigated in 15 patients suffering from Huntington's disease, 8 clinically inconspicuous offspring, and 30 healthy normal controls. The following results were obtained: 1. An obvious H-reflex over the anterior tibial muscle was found in 12 of 15 patients; there was no H-reflex in only 3 patients.

Correlation between tremor, voluntary contraction, and firing pattern of motor units in Parkinson's disease.

PATIENTS WITH TREMOR OF PARKINSONISM SHOW THREE CHARACTERISTICS OF MOTOR UNIT ACTIVITY: rhythmic spontaneous resting discharge, abnormally low firing rates during voluntary contraction, and consistent differences in firing pattern between small and large motor units. Smaller units discharge once per tremor beat at weak contractions but change into bursts of two or three spikes per beat at stronger forces. Large units are later recruited and fire preferentially once per beat.