Measurement of jugular venous blood gases for prediction of brain ischaemia following carotid ligation. A comparison with direct measurements of cerebral blood flow.

Measurements of various indices derived from arterial and jugular venous blood gas and pH values during temporary carotid clamping have been compared with measurements of cerebral blood flow and internal carotid artery pressure in 15 patients referred for carotid ligation. Cerebral venous blood gas measurements did not provide a reliable index of cerebral ischaemia.