| Project/Area Number |
11670422
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Legal medicine
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| Research Institution | Fukushima Medical University |
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Principal Investigator |
HIRAIWA Kouichl Fukushima Med. Univ., Schl. Of Med., Professor, 医学部, 教授 (60124616)
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| Co-Investigator(Kenkyū-buntansha) |
SAKUMA Jun Fukushima Med. Univ., Schl. Of Med., Research Assistat, 医学部, 助手 (60305365)
GUNJI Hirobumi Fukushima Med. Univ., Schl. Of Med., Research Assistat, 医学部, 助手 (20234643)
ABE Sumiko Fukushima Med. Univ., Schl. Of Med., Research Assistat, 医学部, 助手 (50136975)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Trauma / Cerebral artery rupture / Complication / Causal relationship |
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| Research Abstract |
Complications arising from trauma may cause sudden death, or cerebral infarction may occur due to traumatic cerebrobasilar disorder. Such cases may be misdiagnosed as spontaneous diseases. Thus, the present study is aimed to clarify the mechanism of traumatic cerebral artery rupture.
1. Out of 156 autopsied traffic accident cases, 26 (16.7%) of the victims had gross primary brainstem injury. Eight of the pedestrians and 2 of the cyclists had medullary lesions for which cause could not be explained by the direct impact to the head, suggesting that indirect forces, I.e., the inertia of the head, had caused neck hyperextension at the moment of impact with the car. These findings led to conclusion that when a pedestrian or cyclist is hit by a vehicle travelling at high speed, the traction force due to the inertia of the head is one of the causes of violent hyperextension of the head that result in traumatic brainstem lesions.
2. Out of 169 autopsy cases due to head injury, isolated traumatic subarachnoid hemorrhage (ITSAH) accounted for approximately 10% of the fatal head injuries. Analyses of the relationship between site of impact and site of vascular injury showed that the vertebral artery on the same side as the site of impact tended to be injured, and that an external force causing rotation of the head was likely to cause tear of the artery. It was also confirmed that in cases in which an external force equivalent to that of a fist punch is applied to the head or face, the alcohol level in the victim at the time of impact is a significant factor affecting the likelihood of occurrence of artery rupture. The results also suggested that a difference between diameters of left and right vertebral arteries is a risk factor for artery rupture.
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