首页 > 文献资料
-
SURVEY ON SLEEP RESEARCH IN CHINA
It is a big topic on sleep research in China,current sleep research in China will be introduced from basic and early research in the paper.Basic researches Current sleep research in China began with the study on hybernation using urchin at Peking University in the early 1950s.During 1960 ~ 1979,lots of agencies such as Shanghai Institute of Physiology of Academia Sinica,Institute of Psychology of Academia Sinica,Henan Medical University have accumulated large investigative and experimental data on sleep,but the most of those data focused on the descriptive researches of animal assortment (feline,dog,goat,mouse,rat and macque)and sleep classicification.
关键词: experimental data -
-
Objective: To observe pressure changes in the spinal canal of the vertebrarium subjected to impact. From the point of view of impact, pressure changes and spinal cord injuries, the relationship between the type of spinal fracture and the severity of spinal cord injuries were analyzed and some experimental data were provided for early evaluation of severity of spinal cord injuries. Methods: An experimental model of spinal burst fracture was made with Type BIM-I bio-impact machine and techniques of high velocity vertical loading in static pattern and stress shielding were adopted. Vertebral sections T10-L4 taken from fresh cadavers were impacted and pressure changes in the spinal canal were observed. The types and severity of spinal fracture were studied with gross and radiography examination. Results: Great positive pressure wave (wave A) in the spinal canal of the 4 vertebral specimens with burst fracture was recorded. The peak value of pressure was correlated with the severity of posterior column injuries. Generally, the peak value of pressure was low in the samples with posterior column injuries, but high in the samples without injuries. The predominant features of fractures were burst fractures of vertebral body and severe destruction of the skeletal and fiber structure of the spinal canal. Positive and negative pressure waves (wave B) were recorded in 2 vertebral samples in which no significant abnormal changes were found by radiography examination, however, a little liquid effusion in the vertebral body was found by gross examination. Conclusions: The type of pressure wave in the spinal canal is related to the deformation or the destruction of the spinal canal structure. The peak value of the pressure is non-linearly related to the obstruction in the spinal canal, but related to posterior column injuries.