Monday, to King's, to have cardiac ambulatory test. Three electrodes are strapped to the chest, and the signals are collected on a rectangular device about the size of a cigarette packet, over a period of 24 hours.
MRI of the brain didn't show any acute ischaemic lesions but there is a background of moderate small vessel disease. There are some discrete white matter lesions which appear to be more numerous on the left than on the right. Carotid Dopplers showed 40-49% on the right and 20-30% on the left. Interestingly, the white matter lesions on the brain are more numerous on the side of the lower grade carotid stenosis.
Regarding the EEG, the background activity shows a bilateral and symmetrical alpha, at 8-9 Hz, up to 78 μV.It is seen over posterior regions and attenuates on visual attention. Some slow theta and delta activity is seen over temporal regions, especially over the left hemisphere. Some sharp transients may be seen associated to slow waves, and seen over fronto-temporal regions as well as more prominent over the left hemisphere. These probably don't represent epileptiform discharges but rather, non-specific changes which are seen in cerebro-vascular disease.