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静态球对称引力场对钟和尺的影响
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作者 杨青勇 《广西师范学院学报(自然科学版)》 2003年第2期105-109,共5页
从爱因斯坦引力场方程的严格解———史瓦西解的物理解释出发 ,讨论了引力场中“钟慢”、“尺缩”效应与弯曲时空几何结构的对应关系 ,指出真实引力场对钟和尺的影响与表观引力场中的“钟慢”、“尺缩”效应有本质上的区别 .
关键词 史瓦西几何 引力效应 “钟慢” “尺缩”
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Six Minute Walk Test to assess functional capacity in chronic liver disease patients 被引量:6
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作者 Hatem F Alameri Faisal M Sanai +4 位作者 Manal Al Dukhayil Nahla A Azzam Khalid A Al-Swat Ahmad S Hersi Ayman A Abdo 《World Journal of Gastroenterology》 SCIE CAS CSCD 2007年第29期3996-4001,共6页
AIM: To examine the utility of Six Minute Walk Test (6MWT) in patients with chronic liver disease (CLD). METHODS: Two hundred and fifty subjects between the ages of 18 and 80 (mean 47) years performed 6MWT and the Six... AIM: To examine the utility of Six Minute Walk Test (6MWT) in patients with chronic liver disease (CLD). METHODS: Two hundred and fifty subjects between the ages of 18 and 80 (mean 47) years performed 6MWT and the Six Minute Walk Distance (6MWD) was measured. RESULTS: The subjects were categorized into four groups. Group A (n = 45) healthy subjects (control); group B (n = 49) chronic hepatitis B patients; group C (n = 54) chronic hepatitis C patients; group D (n = 98) liver cirrhosis patients. The four groups differed in terms of 6MWDs (P < 0.001). The longest distance walked was 421 ± 47 m by group A, then group B (390 ± 53 m), group C (357 ± 72 m) and group D (306 ± 111 m). The 6MWD correlated with age (r = -0.482, P < 0.01), hemoglobin (r = +0.373, P < 0.001) and albumin (r = +0.311, P < 0.001) levels. The Child-Pugh classification was negatively correlated with the 6MWD in cirrhosis (group D) patients (r = -0.328, P < 0.01). At the end of a 12 mo follow-up period, 15 of the 98 cirrhosis patients had died from disease complications. The 6MWD for the surviving cirrhotic patients was longer than for non-survivors (317 ± 101 vs 245 ± 145 m, P = 0.021; 95% CI 11-132). The 6MWD was found to be an independent predictor of survival (P = 0.024). CONCLUSION: 6MWT is a useful tool for assessing physical function in CLD patients. We suggest that 6MWD may serve as a prognostic indicator in patients with liver cirrhosis. 展开更多
关键词 Six Minute Walk Test Chronic liver disease Functional capacity
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