[A system of automatic analysis for ambulatory recordings]

Magnetic ambulatory recordings were made on cassettes and analysed at 60 times the original recording speed using an analogical system. The amplitude of EEG was directly inscribed, in 6 different frequency bands, on paper. Limits of bands are 1, 2, 4, 8, 12, 24 (spindles) and 48 Hz. Included in the system are: automatic detection of rolandic paroxysms, detection of apneas after continuous recording of the respiratory movement and a cardiac frequency monitor. These additional parameters make the interpretation easier. The results and curves obtained are similar to those found in other methods elsewhere. Sigma rhythm or increase of delta activity during sleep are evident. Over long recording periods, research for respiratory apneas and cardiac rhythm variations is quick and easy to do. It is also possible to compare an entire day's paroxysmal activity on either right or left rolandic derivations. This system thus supplies information on various situations: disturbance of vigilance, study of interictal paroxysmal activity or detection of cardiac or respiratory pathology.