Intracranial Movements After Temporoparietal Head Impact.

摘要

Head trauma represents one of the chief causes of injury and fatality in vehicular accidents. The etiology of the brain lesions which occur as a result of head impact has not been defined. These studies were undertaken to determine the displacements of the brain during nonpenetrating head trauma. Anesthetized rhesus monkeys were accelerated to a peak velocity of 7.3 plus or minus 0.1 m/sec and impacted on the left temporoparietal skull surface. Impact forces ranged from 400 to 1088 lbs with a pulse duration of 3 to 6 msec, linear deceleration ranged from 430 to 1500 G's and the maximum average angular acceleration was 83,840 plus or minus 24,082 radians/sec/sec. The lateral skull diameter decreased 3.8 plus or minus 0.7 percent and the left middle cerebral artery shifted 2.9 plus or minus 0.8 mm toward the skull midline within the first 2 msec. In contrast the midline common pericallosal artery shifted toward the impact site reaching its maximum deviation of 2.2 plus or minus 0.6 mm by 3 to 6 msec postimpact. Based on these data it was calculated that the left cerebral hemisphere underwent a strain of 8.6 plus or minus 1.9 percent within the first 5 msec.