RESUMO
Objective To investigate the effect of hydrogen on radiation-induced acute injury in rat brain.Methods Forty-five mature Sprague-Dawley rats were randomly divided into three groups:saline therapy group,hydrogen therapy group and healthy control group.The whole brain of SD rat was irradiated with single dose of 20 Gy by 4 MeV electrons.Rats in therapy group were injected with hydrogen-rich saline after irradiation and were sacrificed at 1,3,7,14 d post-irradiation.The changes of malonaldehyde (MDA),superoxidase dismutase (SOD) and 8-hydroxydeoxygunosine (8-OHdG) in brain homogenate and the pathological changes in brain hippocampus were observed.Results The brain water content (t=3.78,3.18,P＜0.05) and the contents of 8-OHdG (t=2.33,2.71,2.33,P＜0.05) in the therapy group was lower than the control group at 7 d and 14 d post-irradiation.The contents of SOD were significantly higher(t =2.41-2.92,P ＜ 0.05) from 1 to 7 day,while the contents of MDA were significantly lower in therapy group than those in the control group from 1 to 14 day post-irradiation (t =4.01-6.20,P ＜ 0.05).Moreover,the damage degree in the nerve cells of hippocampus was less compared to the control group.Conclusions The hydrogen-rich saline could have protection role in irradiation-induced acute brain injury in rats.
RESUMO
Objective: To explore safety and effects of exercise rehabilitation in aged patients with chronic heart failure (CHF). Methods: A total of 83 aged CHF patients were randomly divided into exercise rehabilitation group (n=42, received exercise training based on usual care) and usual care group (n=41, received usual care). Period of treatment was eight weeks and patients were followed up for 12 months. New York heart association (NYHA) classification was used to represent cardiac function. Left ventricular ejection fraction (LVEF), left ventricular end-diastolic dimension (LVEDd) were determined by ultrasound cardiography, 6 min walking distance (6MWD) and oxygen metabolic equivalent (METs) also were determined , plasma level of brain natriuretic peptide (BNP) was examined. Minnesota living with heart failure questionnaire (MLHFQ) was used to represent quality of life. Rehospitalization rate and mortality rate within 12 months were recorded in all patients. Results: On 8 th weeks after treatment, the LVEF, LVEDd and NYHA class of two groups all significantly improved（P＜0.05 all）,compared with usual care group, there were significant improvement in LVEF [（54.7±6.2）% vs. 65.4±8.7）%], LVEDd [（49.6±8.3）mm vs.（40.2±9.3）mm] and NYHA class [（2.7±0.8）classes vs.（1.9±0.9）classes], P<0.05 all; 6MWD [(122.7±9.2) m vs. (175.6±8.7) m] and METs [(5.8±1.8) vs. (8.4±2.4)] also significantly increased (P<0.01), and plasma level of BNP [(43.4±9.8) pg/ml vs. (31.7±8.9) pg/ml, P<0.05] significantly decreased in exercise rehabilitation group. No severe adverse events occurred in exercise rehabilitation group. After 12 months, compared with usual care group, there were significant increase in MLHFQ score [(45.6±8.2) scores vs. (68.9±7.9) scores], significant decrease in rehospitalization rate caused by heart failure (24.4% vs. 9.5%) , P<0.05 all in exercise rehabilitation group. Conclusion: Exercise rehabilitation is safe and effective in aged patients with chronic heart failure, which can significantly improve cardiac function, enhance exercise capacity and increase quality of life.
RESUMO
BACKGROUND: There are so many experimental and clinical researches on levels of nitrogen monoxide (NO) in serum and endothelins in plasma of patients with stroke; however, ratio and significance between them are still unclear.OBJECTIVE: To observe dynamic changes of levels of NO in serum and endothelins in plasma of patients with stroke.DESIGN: Case-controlled observation.SETTING: Neurological Department and Clinical Neurological Laboratory of the Second Hospital affiliated to Suzhou University.PARTICIPANTS: A total of 216 patients with acute cerebral infarction including 133 males and 83 females and 112 cases with cerebral hemorrhage including 68 males and 44 females were selected from Neurological Department of the Second Hospital affiliated to Suzhou University from September 1999 to December 2001. Another 106 subjects including 63males and 43 females were regarded as healthy control group.METHODS: Contents of NO in serum and endothelins in plasma were measured on 328 patients with stroke and 106 healthy subjects in the courses of 1-3 days, 1, 2, 4, 8 and 12 weeks with nitrate reductase and radio-immunity methods, respectively.MAIN OUTCOME MEASURES: Contents of NO in serum and endothelins in plasma; ratio between NO in serum and endothelins in plasma (NO/endothelins).RESULTS: ① As compared with those in the control group, content of NO in serum of patients with cerebral infarction and cerebral hemorrhage was decreased and reached the lowest value during acute period (within 1-3 days), and then increased gradually and closed to the normal level at about 4 weeks. In addition, content of endothelins in plasma was increased obviously during acute period, reached the peak at 2 weeks, and then decreased gradually. The level was still high at stage of recovery and closed to normal value within 4-8 weeks. ② As compared with that in the control group, NO/endothelins was decreased in cerebral infarction group at the courses of 1-3 days (P ＜ 0.05), reached the lowest value at 1 week (P ＜ 0.001), and increased to the normal level at 2 weeks. Moreover,NO/endothelins was remarkably decreased in cerebral hemorrhage group at the courses of 1-3 days (P ＜ 0.001), reached the lowest value at 1week (P ＜ 0.001), and increased gradually. The changes of course were great and the level reached above normal value at 8 weeks. There was significant difference of dynamic changes of NO/endothelins between cerebral hemorrhage group and cerebral infarction group (P ＜ 0.05).CONCLUSION: NO and endothelins play an important role in onset and development of ischemic cerebrovascular disease and hemorrhagic cerebrovascular disease, and their contents are related to prognosis.