Color flow imaging(CFI)ultrasound technique can discover the tumor vascularity and superimposed it to convontional B-mode ultrasonogram in real-time. The flow velocity on spectral Doppler sonogram can be measured by s...Color flow imaging(CFI)ultrasound technique can discover the tumor vascularity and superimposed it to convontional B-mode ultrasonogram in real-time. The flow velocity on spectral Doppler sonogram can be measured by setting the sample volume to any selected site.One hundred and thirty-six patients with solid hepatic space-occupied lesions had been admitted and 113 cases were confirmed by operation and pathology,23 patients were strongly suspected by hepatic angiography (HAA).Ninety nine patients with 109 nodules were finally diagnosed as hepatic cellular carcinoma(HCC).According to color flow distribution pattern,3 kinds of color configuation had been nominated.Tumor vascularity discovered by CFI,especially the arterial blood flow was easy to be recognized,and its emerge rate was quite different between HCC group(94.5%)and hemangioma(HCH)group(17.07%)(P<0.01).Spectral Doppler studies were also carried out in these cases and the detectability of arterial flow in HCC group(95.41%)was much higher than that to HCH group (21. 95%) (P<0. 005).Resistant index(RI)and pulsatile index(PI)could be used to differentiate HCC (>0. 50 and >0.80 respectively)from HCH (P<0.001 and P<0.001 respectively).Arterial-portal(A-P) shunt could also be detected by CFI and spectral Doppler(mostly its Vmax>0.6m/s).The detection rate of A-P shunt was 64% in HCC group,but no case could be detected in HCH group.展开更多
目的评估瞬时流量测定(transit time flow meter,TTFM)技术在冠状动脉旁路移植术(CABG)中探查移植血管血流通畅状态的应用价值,并分析其测定结果的相关因素。方法对我科2002年3月至2004年1月连续行CABG 301例患者的791支血管移植物进行T...目的评估瞬时流量测定(transit time flow meter,TTFM)技术在冠状动脉旁路移植术(CABG)中探查移植血管血流通畅状态的应用价值,并分析其测定结果的相关因素。方法对我科2002年3月至2004年1月连续行CABG 301例患者的791支血管移植物进行TTFM测定,按照入选标准从中筛选出左乳内动脉(LIMA)旁路移植到左前降支(LAD)的165例患者的TTFM结果,进行血流量和搏动指数(pulsatility index,PI)的多因素分析。结果TTFM技术提示,791支移植物中有严重质量问题的移植血管5支,均手术证实并加以改正。可能影响移植物血流量的主要因素为LAD远端直径、LIMA直径、心肌梗死位置、LAD近端狭窄程度、反流量百分比(percentage of insufficiency)、左心室舒张期末内径、手术方式(体外循环和非体外循环);影响PI值的主要因素为LAD远端直径、反流量百分比和手术方式。结论TTFM在判断CABG移植物状态时具有一定的诊断价值。多种因素均可影响移植物的血流量和PI值,应考虑主要影响因素以及临床表现来提高TTFM诊断技术错误的敏感性。展开更多
目的探讨坐位下体负压对人体心脑血管系统的影响。方法15名健康青年男性在-4.00 kPa、-6.67 kPa坐位下体负压下,分别测试负压前、负压暴露0.5、1、2、3、4、5 m in和卸压后1、3、5 m in的大脑中动脉的搏动指数(PI)、阻力指数(R I)、血...目的探讨坐位下体负压对人体心脑血管系统的影响。方法15名健康青年男性在-4.00 kPa、-6.67 kPa坐位下体负压下,分别测试负压前、负压暴露0.5、1、2、3、4、5 m in和卸压后1、3、5 m in的大脑中动脉的搏动指数(PI)、阻力指数(R I)、血流速度(VMCA),心率(HR),血氧饱和度(SaO2),血压(BP)及主观症状和客观体征。结果在-4.00 kPa下体负压作用下,PI、R I、BP、SaO2无明显改变,VMCA在负压作用4、5 m in时减慢(P<0.05);HR在负压作用3、4、5 m in时增快(P<0.05)。在-6.67 kPa下体负压作用下,PI、R I在负压作用4、5 m in时增大(P<0.05);VMCA在负压作用2、3 m in时显著减慢(P<0.05),在4、5 m in时非常显著减慢(P<0.01),卸压后1 m in尚未恢复(P<0.05),随后恢复至对照水平;负压作用各时间点HR均显著增快(P<0.01);SaO2在负压暴露5 m in时显著下降(P<0.05);收缩压与负压前无明显变化,舒张压显著升高(P<0.05)。结论坐位下体负压造成血液在下肢淤积,搏动指数和阻力指数升高,大脑中动脉血流速度减慢,引起大脑血供减少,为空中晕厥和立位耐力不良的医学鉴定提供了人体实验依据。展开更多
文摘Color flow imaging(CFI)ultrasound technique can discover the tumor vascularity and superimposed it to convontional B-mode ultrasonogram in real-time. The flow velocity on spectral Doppler sonogram can be measured by setting the sample volume to any selected site.One hundred and thirty-six patients with solid hepatic space-occupied lesions had been admitted and 113 cases were confirmed by operation and pathology,23 patients were strongly suspected by hepatic angiography (HAA).Ninety nine patients with 109 nodules were finally diagnosed as hepatic cellular carcinoma(HCC).According to color flow distribution pattern,3 kinds of color configuation had been nominated.Tumor vascularity discovered by CFI,especially the arterial blood flow was easy to be recognized,and its emerge rate was quite different between HCC group(94.5%)and hemangioma(HCH)group(17.07%)(P<0.01).Spectral Doppler studies were also carried out in these cases and the detectability of arterial flow in HCC group(95.41%)was much higher than that to HCH group (21. 95%) (P<0. 005).Resistant index(RI)and pulsatile index(PI)could be used to differentiate HCC (>0. 50 and >0.80 respectively)from HCH (P<0.001 and P<0.001 respectively).Arterial-portal(A-P) shunt could also be detected by CFI and spectral Doppler(mostly its Vmax>0.6m/s).The detection rate of A-P shunt was 64% in HCC group,but no case could be detected in HCH group.
文摘目的评估瞬时流量测定(transit time flow meter,TTFM)技术在冠状动脉旁路移植术(CABG)中探查移植血管血流通畅状态的应用价值,并分析其测定结果的相关因素。方法对我科2002年3月至2004年1月连续行CABG 301例患者的791支血管移植物进行TTFM测定,按照入选标准从中筛选出左乳内动脉(LIMA)旁路移植到左前降支(LAD)的165例患者的TTFM结果,进行血流量和搏动指数(pulsatility index,PI)的多因素分析。结果TTFM技术提示,791支移植物中有严重质量问题的移植血管5支,均手术证实并加以改正。可能影响移植物血流量的主要因素为LAD远端直径、LIMA直径、心肌梗死位置、LAD近端狭窄程度、反流量百分比(percentage of insufficiency)、左心室舒张期末内径、手术方式(体外循环和非体外循环);影响PI值的主要因素为LAD远端直径、反流量百分比和手术方式。结论TTFM在判断CABG移植物状态时具有一定的诊断价值。多种因素均可影响移植物的血流量和PI值,应考虑主要影响因素以及临床表现来提高TTFM诊断技术错误的敏感性。
文摘目的探讨坐位下体负压对人体心脑血管系统的影响。方法15名健康青年男性在-4.00 kPa、-6.67 kPa坐位下体负压下,分别测试负压前、负压暴露0.5、1、2、3、4、5 m in和卸压后1、3、5 m in的大脑中动脉的搏动指数(PI)、阻力指数(R I)、血流速度(VMCA),心率(HR),血氧饱和度(SaO2),血压(BP)及主观症状和客观体征。结果在-4.00 kPa下体负压作用下,PI、R I、BP、SaO2无明显改变,VMCA在负压作用4、5 m in时减慢(P<0.05);HR在负压作用3、4、5 m in时增快(P<0.05)。在-6.67 kPa下体负压作用下,PI、R I在负压作用4、5 m in时增大(P<0.05);VMCA在负压作用2、3 m in时显著减慢(P<0.05),在4、5 m in时非常显著减慢(P<0.01),卸压后1 m in尚未恢复(P<0.05),随后恢复至对照水平;负压作用各时间点HR均显著增快(P<0.01);SaO2在负压暴露5 m in时显著下降(P<0.05);收缩压与负压前无明显变化,舒张压显著升高(P<0.05)。结论坐位下体负压造成血液在下肢淤积,搏动指数和阻力指数升高,大脑中动脉血流速度减慢,引起大脑血供减少,为空中晕厥和立位耐力不良的医学鉴定提供了人体实验依据。
