[Dystocia and intracranial hemorrhage in perinatal autopsy]

A statistic analysis of 1,421 perinatal autopsies from our institute in 30 years divided into 5-year groups, matched with clinical data was reported. Dystocia rate was 2.3 times increased mainly because the number of cesarean section was increased 6.8 times. The rate of intracranial hemorrhage has not been reduced significantly in the 6-groups. However in the last 5 years intracranial hemorrhage due to trauma as result of dystocia has decreased. The development of intracranial hemorrhage depends upon the birth weight and the degree of anoxia: the lower the birth weight, the more severe the anoxia, the more intracranial hemorrhage. The location of hemorrhage is intraventricular and subarachnoid. The higher the birth weight, the more the traumatic type of intracranial hemorrhage, and the location of bleeding was subdural due to tentorial tear of the cerebellum. Trauma occurred more frequently with severe anoxia. In the neonatal intracranial hemorrhage group 2/3 died within 2 days; a few died after one week.