Monitoring Of The Different Of Pressure Of Arterial Oxygen Between The Carotid And The Femoral And Clinical Significance In Patients With Head Injury

Objective The goal of this study was to learn of how about the difference of pressure of arterial oxygen(Po2) between the carotid and the femoral and whether or not the difference of Po2 between the carotid and the femoral is relative to hypoxia of brain after head injury. Methods Forty patients with acute head injury were divided into four groups according to the GCS(â… : 6 patients for GCS 3-5score ;â…¡: 16 patients for GCS 6-8 score; â…¢: 8 patients for GCS 9-12 score; â…£ :10 patients for GCS 13-15score). The Po2 of the carotid and the femoral was monitored for every patient .At the same time, 26 patients including every group were monitored using transcranial dopplergraphy. Additional, 22 severe head injury were continuously monitored on Po2 of the carotid and the femoral for 5 day. Results (1)The difference of Po2 between the carotid and the femoral was identified inâ… and â…¡ group. The Po2 of carotid is more less then the Po2 of femoral(P<0.05). (2)When the Po2 of carotid with severe head injury was reduced persistently during the first 5 day after admission, the patient must have be poor outcome.(3)The changes of the difference of Po2 between the carotid and the femoral correlated with the diastolic velocity of middle cerebral artery and the GCS. Conclusions With the increase of ICP after head injury, the difference of Po2 between the carotid and the femoral was increased gradually. We suggest that the oxygen inshort supply is one of the most important reasons of hypoxia of brain tissue.