心肌缺血高压氧治疗对心脏起搏器的影响

为探讨高压氧对安装心脏起搏器的心肌缺血病人的治疗价值和安全性 ,前瞻性地分析了 38例安装心脏起搏器伴心肌缺血的病人高压氧治疗前后起搏阈值、心电图、血压及一氧化氮 (NO)、心钠素 (ANP)、血管紧张素Ⅱ(AT Ⅱ )的变化。结果 :高压氧治疗后 ,心肌缺血的心电图表现改善 ,总有效率为 92 .1% ;起搏阈值电压显著降低(1.6 2± 0 .6 8vs 1.91± 0 .6 1V ,P <0 .0 1)、脉宽显著变窄 (0 .2 5± 0 .12vs0 .2 9± 0 .10ms ,P <0 .0 1) ;NO由治疗前 5 7.89± 6 0 .82 μmol/L提高到治疗后 6 3.87± 48.0 7μmol/L(P <0 .0 1) ;ANP、AT Ⅱ起搏后显著降低 (分别为 179.95±5 2 .2 9vs 186 .37± 5 4.11pg/ml,P <0 .0 1;312 .37± 6 7.84vs 331.71± 75 .44pg/ml,P <0 .0 5 ) ,血压下降 (P <0 .0 1)。结论 :高压氧治疗可改善心肌缺氧 ,降低起搏阈值     

长程、普通心室晚电位的对比及其重复性的研究

探讨数字化Holter记录仪监测长程心室晚电位 (LVLP)的可靠性。健康受试者 30例 ,按立体正交导联方式记录 2 4h动态心电图 ,选择 1个LVLP数值 ,与同时记录的短程心室晚电位 (VLP)进行比较。结果两次记录的各参数差异不大 (95 .83± 8.34ms,2 2 .9± 7.0 3ms,5 4 .73± 2 5 .89μV及 95 .5 7± 8.5 7ms,2 3.99± 7.81ms,5 3.6 1± 2 5 .4 1μV ,P均 >0 .0 5 ) ;选取Holter中任意 3个连续的时间段 ,计算机自动计算出VLP各项参数的数值 ,分别比较这 3组数值 ,结果亦无明显统计学差异 (95 .5± 7.94ms,2 4 .6± 7.11ms ,4 6 .6± 2 4 .99μV ;95 .7± 8.73ms ,2 6 .6± 7.83ms,4 5 .8± 2 3.86 μV及 95 .6± 8.32ms ,2 6 .0± 8.6 8ms,4 7.6± 2 5 .12 μV ,P均 >0 .0 5 )。总QRS持续时间是各项参数中重复性最佳的指标。结论 :数字化Holter监测的LVLP与标准的实时记录有很好的一致性 ,且LVLP各项参数的重复性均很高     

病毒性肝炎后肝硬化患者肠道的通透性

目的　探讨病毒性肝炎后肝硬化与肠道通透性的关系。方法　参照Holt等的方法测定96例肝硬化患者血清中二胺氧化酶 (DAO)活性 ;并用气相色谱法测定服用乳果糖、甘露醇后在尿中的分泌率 ,用以评价患者肠黏膜的组织结构及其功能。结果　患者Child +Pugh分级各组中DAO的活性和乳果糖 /甘露醇 (L/M)比值与对照组间差异有显著性 (DAOA级 4 .6 8± 0 .97,B级 6 .0 5± 1.0 2 ,C级7.80± 1.34比 3.98± 0 .93,P <0 .0 5～ 0 .0 0 5 ;L/MA级 0 .0 39± 0 .0 0 7,B级 0 .0 6 8± 0 .0 12 ,C级 0 .119±0 .0 2 3比 0 .0 33± 0 .0 0 4 ,P <0 .0 5～ 0 .0 0 5 )。并发自发性细菌性腹膜炎 (SBP)组与非SBP组间差异有显著性 (DAO 7.6 7± 3.0 3比 4 .96± 0 .95 ,P <0 .0 0 5 ;L/M 0 .10 7± 0 .0 6 0比 0 .0 4 2± 0 .0 0 7,P <0 .0 0 5 ) ;非SBP组与对照组间差异亦具有显著性 (DAO 4 .96± 0 .95比 3.98± 0 .93,P <0 .0 5 ,L/M 0 .0 4 2± 0 .0 0 7比0 .0 33± 0 .0 0 4 ,P <0 .0 5 )。结论　病毒性肝炎后肝硬化患者肠道黏膜受损是导致SBP的主要原因之一 ,测定病毒性肝硬化患者血清中DAO活性及尿中L/M比值可以探知肠黏膜结构及其功能有无损害。     

急性心肌梗塞后血清IgE水平变化的初步研究

急性心肌梗塞36例,分别在梗塞后第1,3,7,14天测血清IgE 水平。结果显示血清IgE 在梗塞后第1天即开始升高(0. 010. 05) 。发病第1天血清IgE 浓度与血清cpk 值峰明显相关(r=0. 6852. 0. 001相似文献   

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

房室传导正常的病窦综合征患者心房或心室起搏的长期随访

评价长期心房或心室起搏对病窦综合征 (SSS)患者心功能及房性心律失常的影响 ,对 1 1 8例SSS伴房室传导正常的患者 (AAI组 56例、VVI组 62例 )进行随访。随访 40 .8± 2 .3个月 ,VVI组 62例中 1 9例NYHA分级增加 ,而AAI组 56例中 4例NYHA分级增加 (P <0 .0 5)。左室射血分数VVI组明显下降 (从 0 .491± 0 .0 4 1至 0 .451± 0 .0 4 3 ,P <0 .0 5) ,而AAI组则增加 (从 0 .482± 0 .0 75增至 0 .535± 0 .0 59,P <0 .0 5)。左房内径VVI组明显增加 (从 33± 6增至 40± 6mm ,P <0 .0 5) ,AAI组从 34± 7增至 36± 6(P >0 .0 5)。房性心律失常发生率VVI组明显增加 (从 35 .5 %增至 45 .2 % ,P <0 .0 5) ,AAI组减少 (从 2 6 .8%降至 0 % ,P <0 .0 1 )。结论 :心房起搏对SSS患者是一安全、可靠的起搏方式 ,可减少房性心律失常的发作 ,有助于患者心功能的改善     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

抗心房颤动起搏器的应用初探

为评价心房程序起搏治疗阵发性心房颤动 (简称房颤 )的有效性 ,1 1例阵发性房颤患者中 1 0例置入Selec tion90 0E(AF2 .0 )型起搏器、1例置入IntegrityTMAFXDR5346型起搏器。对患者进行术前 1个月和术后 1 ,2个月阵发性房颤事件和SF 36生活质量调查。结果 :患者术后 1 ,2个月较术前 1个月在有症状阵发性房颤事件数和生活质量评分有明显降低 (1 3 .0 1± 8.51 ,9.81± 5 .91vs 2 7.0 0± 1 3 .2 1 ;62 .82± 2 1 .57,55 .73± 1 8.48vs 1 1 0 .0 0± 1 6 .57,P值均<0 .0 5) ,术后 2个月较术后 1个月有症状阵发性房颤事件数 (9.81± 5 .91vs 1 3 .0 1± 8.51 )、阵发性房颤总数 (2 1 0 .0 0± 2 69.59vs 30 9.82± 41 8.1 4 )、房颤总持续时间 (6 .0 0± 4 .1 4dvs 7.87± 4 .2 6d)、房颤负荷 (2 0 .0 1 %± 1 3 .80 %vs 2 6 .2 4 %± 1 4 .2 0 % )及生活质量评分 (55 .73± 1 8.48vs 62 .82± 2 1 .57)均降低 (P值均 <0 .0 5)。结论 :心房程序起搏能够减少阵发性房颤事件的发生 ,降低房颤负荷 ,有望成为阵发性房颤药物治疗的重要辅助手段     

糖尿病大鼠一氧化氮与骨代谢变化的研究

目的　研究糖尿病 (DM )大鼠血清一氧化氮 (NO)与早期骨代谢改变的关系。方法2 0只SD大鼠分为 2组 ,一组以链脲佐菌素诱导建立糖尿病 (STZ DM )大鼠模型 ,另一为正常对照组 ,测定 2组大鼠的空腹血糖 (FBG)、HbA1c、血清胰岛素、全身、股骨和腰椎骨密度 (BMD)、骨代谢相关指标〔血清钙、骨钙素、降钙素、甲状旁腺素 (PTH)、维生素D3 及尿吡啶酚 /肌酐比〕和血清NO水平。结果　STZ DM大鼠与正常对照组相比 ,血清NO水平显著升高〔(5 1.3± 11.9vs 38.1± 12 .0 )μmol/L ,P <0 .0 1〕 ;全身、股骨和腰椎的BMD显著降低〔(0 .15± 0 .0 7vs 0 .2 1± 0 .0 2 ) g/cm2 ,P<0 .0 1;(0 .16± 0 .0 2vs 0 .19± 0 .0 3) g/cm2 ,P <0 .0 5 ;(0 .12± 0 .0 4vs 0 .18± 0 .0 6 ) g/cm2 ,P <0 .0 5〕 ;血清钙浓度显著升高〔(135 .9± 11.3vs 117.2± 6 .5 )mg/L ,P <0 .0 0 1〕 ,骨钙素水平显著升高〔(0 .0 7± 0 .0 4vs 0 .0 5± 0 .0 1) μg/L ,P <0 .0 5〕 ,维生素D3 水平显著降低〔(7.6± 1.9vs 11.6± 4 .1)μg/L ,P <0 .0 5〕 ,尿吡啶酚 /肌酐显著降低〔(4.8± 0 .8vs 75 .8± 6 0 .7)nmol/mmolCr,P <0 .0 1〕 ;而降钙素和PTH水平改变无统计学意义。相关性分析显示 ,血清NO与尿吡啶酚排泄呈负相关 (r= - 0 .74 ,     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

骨细胞密度对骨生物力学性能的影响

Objective To investigate osteocyte density as a potential index of bone biomechanical property. Methods Forty 7-month-old female Sprague-Dawley rats were randomly group (EST) and sham operation group (SHAM). At 15 weeks postoperation, the compression test was performed on L5 vertebral body and micro-computed tomography (μ-CT) was used to estimate the three-dimensional bone mineral density (BMD) and three-dimensional microstructure parameters of L6 vertebral body. After fatigue damage testing, the L6 vertebral body was bulk-stained in 1% basic fuchsin and embedded in methylmethacrylate. Mounted bone slices were used to measure microcrack parameters and osteocyte density. Results At 15 weeks postoperation, osteocyte density (Ot. N/T. area) was significantly decreased in OVX group compared with SHAM group and EST group [(1268. 1 ±191.2)/mm2 vs. (1760. 8 ± 376.6)/mm2 and (1550. 9± 202.2)/mm2, F = 3.513,P<0. 05]. Maximum load (ML) was significantly decreased and the length of microcrack (Cr. Le) was significantly increased in OVX group compared with SHAM group, EST group and GEN group [(84. 4±16.9)N vs. (110.3±25.6),(103. 9±15. 8)and(110.1±4. 9)N; (58. 1±6.8) μm vs. (24.2±8. 1), (36. 5±9. 7)and(28.5±7. 5)μm, F=9. 561,3. 179, all P<0. 05]. Compared with SHAM group and EST group, bone trabecula connection density (Conn. D) was significantly decreased and trabecular separation (Tb. Sp) was significantly increased in OVX group [(47.4±7.4) m-3 vs. (71.8±16.0)and (74.0±12.7)m-3;(315.0±32.7)μm vs. (222. 5±21.7)and (273.3± 50.0)μm, F=7. 635,7. 007, all P<0. 05]. Bone mineral content (BMC) was lower in OVX group than that in SHAM group[(6.5±2. 2)g vs. (7. 9±1.2)g, P<0. 05]. When data in four groups were overall analyzed, Ot. N/T. Ar was positively correlated with ML, Conn. D and BMC (R2 = 0. 7874, 0. 1153, 0. 1309, all P<0. 05), but was negatively correlated with Cr. Le and Tb. Sp (R2 =0. 5738, 0. 3964, both P < 0.05). Conclusions Osteocyte plays a crucial role in maintaining bone biomechanical property and osteocyte density may be considered as a useful indicator for assessing bone biomechanical property.     

不同方式心脏起搏对左心构型的影响

目的　探讨右心室起搏 (VVI)和双腔起搏 (DDD)对各种症状性心动过缓患者左心构型的影响。方法　对安装永久起搏器的 45例患者行VVI起搏 (19例 )和DDD起搏 (2 6例 ) ,平均随访 (2 5 .2± 4.2 )个月 ,于术前和术后分别进行心脏超声检查 ,观察左心房内经 (LAD)、左心室内经(LVD)、心室间隔厚度 (VST)和左心室后壁厚度 (PWT)。结果　DDD起搏组的LAD显著减小 ,为3 2 .2 3mm± 1.45mm比 3 1.47mm± 1.47mm (P <0 .0 5 ) ;LVD趋向于正常 ,为 5 1.62mm± 1.91mm比 5 1.40mm± 2 .15mm (P >0 .0 5 ) ;VST和PWT虽无明显变化 ,分别为 0 .98cm± 0 .12cm比1.0 1cm± 0 .11cm (P >0 .0 5 )和 0 .99± 0 .10比 1.0 0± 0 .10cm(P >0 .0 5 ) ,但有增加的趋势。VVI组的LAD和LVD显著增大 ,分别为 3 2 .81± 1.5 1比 3 2 .94± 1.5 5mm和 5 2 .17mm± 2 .0 8mm比5 3 .46mm± 1.73mm(P <0 .0 5 ) ;VST显著增加 ,为 1.0 1cm± 0 .11cm比 1.0 3cm± 0 .12cm (P <0 .0 5 ) ,PWT也有增加的趋势 ,为 1.0 0± 0 .10比 1.0 2± 0 .0 9cm (P >0 .0 5 )。结论　DDD起搏改善患者的左心房室腔构型 ,但可能增加VST和PWT的厚度 ;VVI起搏对患者的左心构型有负面影响。     

盐酸吡格列酮对SHR心脏成纤维细胞增殖的影响及其与一氧化氮的关系

目的　研究胰岛素增敏剂盐酸吡格列酮 (PIO)对培养的自发性高血压大鼠 (SHR)和试验大鼠 (Wistar)心脏成纤维细胞 (CFs)增殖的影响及其与一氧化氮 (NO)的关系。方法　采用胶原酶消化法培养SHR和Wistar的CFs ,四氮唑蓝比色法 (MTT)测定CFs的增殖状况 ,硝酸还原酶法测定CFs培养上清NO浓度。结果　 (1) 1× 10 - 7、1× 10 - 6 、5× 10 - 6 、1× 10 - 5 mol/L的PIO作用 2 4h ,SHR和Wistar的吸收值 (A4 90 值 )分别为SHR 0 .19± 0 .0 1、0 .18± 0 .0 1、0 .16± 0 .0 1、0 .16± 0 .0 2 ;Wistar 0 .2 1± 0 .0 1、0 .19± 0 .0 1、0 .18± 0 .0 1、0 .17± 0 .0 1,与各自对照组 (SHR 0 .2 2± 0 .0 1,Wistar 0 .2 1± 0 .0 2 )相比 ,差异非常显著 (P <0 .0 1)。 (2 ) 5× 10 - 6 mol/L的PIO作用 12h、2 4h、3 6h、48h、60h、72h后 ,SHR的A490 值与同一时间点相比 ,差异非常显著 (P <0 .0 0 1) ;Wistar的A4 90 值与同一时间点的对照组相比 ,差异非常显著 (P <0 .0 0 1)。 (3 ) 5×10 - 6 mol/L的PIO干预 48小时后 ,SHR和Wistar的CFs培养上清NO浓度分别为 111.2± 12 .4μmol/L、2 2 1.7± 3 5.3μmol/L ,与各自对照组 (76.8± 2 .4μmol/L、112 .1± 8.9μmol/L)相比 ,差异非常显著 (P <0 .0 0 1)。 结论     

胫骨下段扭转角和外翻角的测量及临床意义

对国人胫骨 81副 (男性 41副 ,女性 40副 )胫骨下段扭转角及外翻角进行测量。结果 :1胫骨下段扭转角 ,男性左侧 64 .8°± 3 .6°,右侧 68.7°± 2 .8°;女性左侧 63 .6°± 5 .1°,右侧 67.0°± 6.1°。2胫骨下段外翻角 :男性左侧 15 .6°± 3 .0°,右侧 16.4°± 2 .9°;女性左侧 15 .6°± 3 .0°,右侧 16.4°± 2 .9°。男性无论扭转角还是外翻角其侧别差异显著 P<0 .0 1及 P<0 .0 5 ;女性扭转角侧别差异显著 P<0 .0 1,而外翻角侧别无差异 P>0 .0 5 ;男、女性别比较 :除左右外翻角差异显著 P<0 .0 1外 ,其余各角性别间均无差异 P>0 .0 5。在此基础上研制的内固定钢板更能符合胫骨下段的解剖特点 ,避免或减少因钢板塑形不佳所带来的并发症