[Vertigo and vertebral artery stenosis (author's transl)].

Forty nine elderly patients with osteochondrosis of the cervical spine and on whom carotid angiography had been performed were divided into two groups. In one 36 patients had vestibular symptoms whereas the other group of remaining patients was free of such symptoms. Comparison of both groups showed that vertigo (20 patients), other vestibular symptoms or nystagmus were not solely related to vertebral artery stenosis.

Single motor unit activity in extraocular muscles in man during fixation and saccades.

Extraocular motor unit activity was recorded electromyographically from the lateral and medial rectus muscles in eight normal subjects, together with their EOGs. Twelve motor units showed a discharge pattern characterized by regular firing during positions of fixation, a burst of saccadic "on" activity and complete silence during saccades in the "off" direction. Two other units seemed to be phasic or predominantly phasic.

[Follow-up studies of subtotal carotid artery stenosis (author's transl)].

Angiographic and/or operative follow up studies on 19 patients with angiographically demonstrated subtotal carotid artery stenosis showed the following results: In 3 out of 16 cases where no immediate operation of the stenosis was performed, complete occlusion followed within a week of the angiographic demonstration of the stenosis. Though intramural artifacts did not occur, this could be a consequence of the angiographic procedure (temporary fall of blood pressure?). In 4 out of 7 cases with subtotal stenosis where the diagnosis was known for at least 6 months, no occlusion occurred.

Dissecting aneurysm of the petrous portion of the internal carotid artery. Case report and review of previous cases.

A "spontaneous" dissecting aneurysm of the petrous portion of the right internal cartoid artery in a 60 year old man was demonstrated angiographically. It showed a typical double lumen which is rarely demonstrated by angiography. It was probably of atherosclerotic origin.

Interval analysis of repetitive denervation potentials of human skeletal muscle.

Interval analyses of denervation potentials (fibrillation-potentials and positive sharp waves) in human skeletal muscles were performed using a DEC PDP-12 computer. Extremely small differences between consecutive intervals (usually less than 1%) and slow up and down drifts in the spontaneous discharge frequency were found to be characteristic of repetitive denervation potentials. These two findings are safe criteria for the clinical diagnosis of denervation and they may be superior to the more commonly used criteria based upon the shapes, amplitudes, and durations of the potentials.