Abstract
SUMMARY Bilateral carotid angiography was carried out in thirty-six unselected patients. Anaesthesia was induced with thiopentone and maintained with nitrous oxide, oxygen and halothane. Overall values for the systolic blood pressure showed significant decreases during anaesthesia of 30 minutes duration and also 2 minutes after the injection of 60 per cent Urografin into the carotid artery. Decreases in the systolic pressure were most marked in patients who were found to have cerebrovascular lesions and occurred to a lesser extent in those with cerebral tumours and with negative radiological findings. Carotid puncture was made difficult by a fall in the systolic pressure although anatomical and pathological factors affecting the neck were also responsible. Possible causes of these findings have been discussed. The above anaesthetic technique was considered unsuitable for patients with cerebrovascular lesions undergoing carotid angiography.
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