Point-of-care ultrasound has been increasingly used in evaluating shocked patients including the measurement of inferior vena cava(IVC) diameter. Operators should standardize their technique in scanning IVC. Relativec...Point-of-care ultrasound has been increasingly used in evaluating shocked patients including the measurement of inferior vena cava(IVC) diameter. Operators should standardize their technique in scanning IVC. Relativechanges are more important than absolute numbers. We advise using the longitudinal view(B mode) to evaluate the gross collapsibility, and the M mode to measure the IVC diameter. Combining the collapsibility and diameter size will increase the value of IVC measurement. This approach has been very useful in the resuscitation of shocked patients, monitoring their fluid demands, and predicting recurrence of shock. Pitfalls in measuring IVC diameter include increased intra-thoracic pressure by mechanical ventilation or increased right atrial pressure by pulmonary embolism or heart failure. The IVC diameter is not useful in cases of increased intra-abdominal pressure(abdominal compartment syndrome) or direct pressure on the IVC. The IVC diameter should be combined with focused echocardiography and correlated with the clinical picture as a whole to be useful.展开更多
We have previously reported that the maximal inferior vena cava(IVC) diameter during quiet expiration(IVCe) measured by ultrasonography correlates well with the amount of body fluid, especially the circulating blo... We have previously reported that the maximal inferior vena cava(IVC) diameter during quiet expiration(IVCe) measured by ultrasonography correlates well with the amount of body fluid, especially the circulating blood volume[1] and proposed using the criteria of IVC diameter to determine dry weight(DW) in anuric hemodialyzed (HD) patients: standard IVCe of pre-and post-HD are (14.9±0.4) and (8.2±0.3) mm, respectively[2]. However, the same post-HD IVC criterion should not be applied to nonoliguric HD patients because it could result in rapid deterioration of residual renal function due to forced dehydration. Although the biochemical DW marker plasma atrial natriuretic peptide (ANP) is useful to evaluate hypervolemia but not hypovolemia,both hyper-and hypovolemia can be detected by IVC measurement.……展开更多
The IVC diameters in HD patients
Since BW and stature as well as gender and age were not considered to be determinant factors of the IVC diameters, these factors were not accounted for in evaluating the IVC d... The IVC diameters in HD patients
Since BW and stature as well as gender and age were not considered to be determinant factors of the IVC diameters, these factors were not accounted for in evaluating the IVC diameters in HD patients. The IVC diameters of stable anuric HD patients are shown in Table 2. In agreement with our previous observation [7-9] ,the reduction of BW from (51.7±12.6) to (49.3±12.6)kg by ultrafiltration during HD resulted in a significant (P<0.0001)reduction of the IVCe and IVCi from (14.9 ± 3.2) to (6.8±1.9)mm and (5.2±4.2) to (0.1±0.3) mm,respectively. Thus,CI values before and at the end of HD were calculated as (0.68±0.24) and (0.98±0. 05), respectively (P<0.0001).
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目的:分析超声检测下腔静脉(IVC)和锁骨下静脉(SCV)内径变异在预测全麻诱导后低血压(PIH)中的价值。方法:回顾性选取2021年5月—2023年5月在咸宁市第一人民医院行全麻手术的204例患者作为研究对象,根据是否发生PIH将其分为研究组(发生PI...目的:分析超声检测下腔静脉(IVC)和锁骨下静脉(SCV)内径变异在预测全麻诱导后低血压(PIH)中的价值。方法:回顾性选取2021年5月—2023年5月在咸宁市第一人民医院行全麻手术的204例患者作为研究对象,根据是否发生PIH将其分为研究组(发生PIH,86例)和对照组(未发生PIH,118例)。对两组患者的基础资料、麻醉诱导前血压、麻醉诱导药物用量进行对比。比较IVC内径的最大值(IVCmax)和最小值(IVCmin)、SCV内径的最大值(SCVmax)和最小值(SCVmin),并计算IVC塌陷指数(IVCCI)和SCV塌陷指数(SCVCI)。采用受试者工作特征(ROC)曲线分析IVC、SCV内径及变异对全麻PIH的预测价值。结果:两组基础资料、麻醉诱导前血压指标和麻醉诱导药物用量比较,差异均无统计学意义(P>0.05)。研究组IVCmax、IVCmin、SCVmax、SCVmin水平均低于对照组,IVCCI、SCVCI水平均高于对照组,差异均有统计学意义(P<0.05)。受试者操作特征(ROC)曲线分析结果显示,麻醉诱导前IVCmax、IVCmin、SCVmax、SCVmin、IVCCI、SCVCI水平预测PIH的ROC曲线下面积(area under curve,AUC)分别为0.674、0.675、0.618、0.707、0.895、0.905,其中,SCVCI的AUC和cut-off值下的敏感度均为最高,分别为0.905、65.12%。结论:全麻PIH患者可表现为IVC和SCV内径缩小及IVCCI、SCVCI等内径变异指标的增高,采用血管超声技术检测上述变异指标可辅助预测PIH风险。展开更多
目的:分析超声在重症患者不同部位下下腔静脉内径及塌陷指数中的应用价值。方法:选取2022年1月—2023年1月入住上饶市人民医院重症监护室(Intensive Care Unit,ICU)45例患者,超声监测患者剑突下及右侧腹腋中线图像,测量患者不同部位下...目的:分析超声在重症患者不同部位下下腔静脉内径及塌陷指数中的应用价值。方法:选取2022年1月—2023年1月入住上饶市人民医院重症监护室(Intensive Care Unit,ICU)45例患者,超声监测患者剑突下及右侧腹腋中线图像,测量患者不同部位下随着不同呼吸周期时下腔静脉内径,并计算下腔静脉塌陷指数(inferior vena cava collapsibility index,IVC-CI),分析其是否具有统计学上的相关性。结果:本研究共45例患者同时获得剑突下及右侧腹腋中线图像;吸气末、呼气末右侧腹腋中线位置的下腔静脉内径值均显著高于剑突下位置的下腔静脉内径值,差异均有统计学意义(P<0.05);吸气末与呼气末下剑突下及右侧腹腋中线位置的下腔静脉长径、下腔静脉短径、IVC-CI比较差异均无统计学意义(P>0.05);吸气末与呼气末状态下,剑突下下腔静脉长径、下腔静脉短径、IVC-CI与右侧腹腋中线位置的下腔静脉长径、下腔静脉短径、IVC-CI均显著正相关(P<0.05)。结论:不同呼吸状态下,不同部位下腔静脉长径、下腔静脉短径、IVC-CI具有良好的相关性,可互相替代测量,值得临床重视。展开更多
目的探讨高龄肺癌患者超声测量下腔静脉内径的呼吸变异率(respiratory variability of diameter of inferior vena cava,RIVC)评估容量负荷的价值。方法选取2019年1月至2022年7月于浙江金华广福肿瘤医院择期行肺癌根治术的高龄患者78例...目的探讨高龄肺癌患者超声测量下腔静脉内径的呼吸变异率(respiratory variability of diameter of inferior vena cava,RIVC)评估容量负荷的价值。方法选取2019年1月至2022年7月于浙江金华广福肿瘤医院择期行肺癌根治术的高龄患者78例为研究对象。术前30min超声检测RIVC和左室舒张末期容积(left ventricular end diastolic volume,LVEDV),根据术中平均动脉压(mean arterial pressure,MAP)和中心静脉压(central venous pressure,CVP)评估患者的容量负荷。结果78例患者中正常容量组39例、低容量组31例和高容量组8例。低容量组和高容量组患者的RIVC和LVEDV均显著高于正常容量组(P<0.05),但低容量组和高容量组患者的RIVC和LVEDV比较差异无统计学意义(P>0.05)。Spearman检验发现,RIVC与术中MAP和CVP均呈显著负相关(P<0.05),而LVEDV与术中MAP和CVP无显著相关性(P>0.05)。78例患者发生术中低血压9例,低血压患者的RIVC显著高于血压正常患者(P<0.05)。Logistic回归分析结果显示,RIVC与容量负荷异常(OR=5.023,95%CI:3.526~6.021,P<0.001)及低血压(OR=3.856,95%CI:2.754~4.859,P<0.001)紧密相关。受试者操作特征曲线显示,RIVC预测容量负荷异常与低血压的曲线下面积分别为0.859(95%CI:0.779~0.921,P<0.001)和0.807(95%CI:0.722~0.899,P<0.001)。结论超声术前检测RIVC对评估高龄肺癌患者容量负荷和低血压有较好的价值。展开更多
文摘Point-of-care ultrasound has been increasingly used in evaluating shocked patients including the measurement of inferior vena cava(IVC) diameter. Operators should standardize their technique in scanning IVC. Relativechanges are more important than absolute numbers. We advise using the longitudinal view(B mode) to evaluate the gross collapsibility, and the M mode to measure the IVC diameter. Combining the collapsibility and diameter size will increase the value of IVC measurement. This approach has been very useful in the resuscitation of shocked patients, monitoring their fluid demands, and predicting recurrence of shock. Pitfalls in measuring IVC diameter include increased intra-thoracic pressure by mechanical ventilation or increased right atrial pressure by pulmonary embolism or heart failure. The IVC diameter is not useful in cases of increased intra-abdominal pressure(abdominal compartment syndrome) or direct pressure on the IVC. The IVC diameter should be combined with focused echocardiography and correlated with the clinical picture as a whole to be useful.
文摘 We have previously reported that the maximal inferior vena cava(IVC) diameter during quiet expiration(IVCe) measured by ultrasonography correlates well with the amount of body fluid, especially the circulating blood volume[1] and proposed using the criteria of IVC diameter to determine dry weight(DW) in anuric hemodialyzed (HD) patients: standard IVCe of pre-and post-HD are (14.9±0.4) and (8.2±0.3) mm, respectively[2]. However, the same post-HD IVC criterion should not be applied to nonoliguric HD patients because it could result in rapid deterioration of residual renal function due to forced dehydration. Although the biochemical DW marker plasma atrial natriuretic peptide (ANP) is useful to evaluate hypervolemia but not hypovolemia,both hyper-and hypovolemia can be detected by IVC measurement.……
文摘 The IVC diameters in HD patients
Since BW and stature as well as gender and age were not considered to be determinant factors of the IVC diameters, these factors were not accounted for in evaluating the IVC diameters in HD patients. The IVC diameters of stable anuric HD patients are shown in Table 2. In agreement with our previous observation [7-9] ,the reduction of BW from (51.7±12.6) to (49.3±12.6)kg by ultrafiltration during HD resulted in a significant (P<0.0001)reduction of the IVCe and IVCi from (14.9 ± 3.2) to (6.8±1.9)mm and (5.2±4.2) to (0.1±0.3) mm,respectively. Thus,CI values before and at the end of HD were calculated as (0.68±0.24) and (0.98±0. 05), respectively (P<0.0001).
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文摘目的:分析超声检测下腔静脉(IVC)和锁骨下静脉(SCV)内径变异在预测全麻诱导后低血压(PIH)中的价值。方法:回顾性选取2021年5月—2023年5月在咸宁市第一人民医院行全麻手术的204例患者作为研究对象,根据是否发生PIH将其分为研究组(发生PIH,86例)和对照组(未发生PIH,118例)。对两组患者的基础资料、麻醉诱导前血压、麻醉诱导药物用量进行对比。比较IVC内径的最大值(IVCmax)和最小值(IVCmin)、SCV内径的最大值(SCVmax)和最小值(SCVmin),并计算IVC塌陷指数(IVCCI)和SCV塌陷指数(SCVCI)。采用受试者工作特征(ROC)曲线分析IVC、SCV内径及变异对全麻PIH的预测价值。结果:两组基础资料、麻醉诱导前血压指标和麻醉诱导药物用量比较,差异均无统计学意义(P>0.05)。研究组IVCmax、IVCmin、SCVmax、SCVmin水平均低于对照组,IVCCI、SCVCI水平均高于对照组,差异均有统计学意义(P<0.05)。受试者操作特征(ROC)曲线分析结果显示,麻醉诱导前IVCmax、IVCmin、SCVmax、SCVmin、IVCCI、SCVCI水平预测PIH的ROC曲线下面积(area under curve,AUC)分别为0.674、0.675、0.618、0.707、0.895、0.905,其中,SCVCI的AUC和cut-off值下的敏感度均为最高,分别为0.905、65.12%。结论:全麻PIH患者可表现为IVC和SCV内径缩小及IVCCI、SCVCI等内径变异指标的增高,采用血管超声技术检测上述变异指标可辅助预测PIH风险。