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Influence of rotating magnetic field on cerebral infarction volume, cerebral edema and free radicals metabolism after cerebral ischemia/reperfusion injury in rats

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Neural Regeneration Research 2006年第9期1卷 777-780页

作者： Xiaohong Liu1, Zhiqiang Zhang2, Lixin Zhang3 1Liaoning Disabled Children’s Rehabilitation Center, Shenyang 110015, Liaoning Province, China 2Department of Rehabilitation, Second Hospital Affiliated to China Medical University, Shenyang 110003, Liaoning Province, China 3Department of Rehabilitation and Physiotherapy, First Hospital Affiliated to China Medical University, Shenyang 110001, Liaoning Province, China Liaoning Disabled Children's Rehabilitation Center Shenyang 110015 Liaoning Province China Department of Rehabilitation China Medical University Shenyang 110003 Liaoning Province China Department of Rehabilitation and Physiotherapy China Medical University Shenyang 110001 Liaoning Province China

BACKGROUND: It has shown that magnetic field can improve blood circulation, decrease blood viscosity, inhibit free radicals, affect Ca2+ flow in nerve cells, control inflammatory and immunological reaction, and accelerate nerve cell regeneration. In addition, protective effect of magnetic field, which acts as an iatrophysics, on ischemic brain tissues has been understood gradually. OBJECTIVE: To investigate the effects of rotating magnetic field (RMF) on volume of cerebral infarction, cerebral edema and metabolism of free radicals in rats after cerebral ischemia/reperfusion injury. DESIGN: Randomized controlled animal study. SETTING: Rehabilitation Center of disabled children, Liaoniang; Department of Rehabilitation, the Second Affiliated Hospital, China Medical University; Department of Rehabilitation Physiotherapy, the First Affiliated Hospital, China Medical University. MATERIALS: A total of 70 healthy Wistar rats aged 18-20 weeks of both genders were selected and randomly divided into 3 groups: sham operation group with 12 rats, control group with 20 rats and treatment group with 38 rats. The treatment group included 4 time points: immediate reperfusion with 6 ones, 6-hour reperfusion with 20 ones, 12-hour reperfusion with 6 ones and 18-hour reperfusion with 6 rats. Main instruments were detailed as follows: magnetic head of rotating magnetic device was 6 cm in diameter; magnetic induction intensity at the surface of magnetic head was 0.25 T in silence; the maximal magnetic induction intensity was 0.09 T at the phase of rotation; the average rotating speed was 2500 r per minute. METHODS: The experiment was carried out in the China Medical University in March 2003. Focal cerebral ischemic animal models were established with modified Longa’s method. Operation was the same in the sham operation, but the thread was inserted as 10 mm. Neurologic impairment was assessed with 5-rating method to screen out cases. Those survivals with grade 1 and grade 2 after ischemia f

关键词： cerebral edema and free radicals metabolism after cerebral ischemia/reperfusion injury in rats free

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