BACKGROUND Malnutrition in cirrhotic patients is correlated with mortality and a better response to liver transplantation.However,recovery of the nutritional status in these patients is a challenge due to the difficul...BACKGROUND Malnutrition in cirrhotic patients is correlated with mortality and a better response to liver transplantation.However,recovery of the nutritional status in these patients is a challenge due to the difficulty in establishing a reliable nutritional diagnosis.The bioelectrical impedance vector analysis(BIVA)method appears as a feasible tool in clinical practice to define the physiological state of cirrhotic patients by assessing hydration and body cellularity.AIM To evaluate body composition in cirrhotic patients using BIVA.METHODS This retrospective cross-sectional study was carried out by following cirrhotic outpatients at a hospital in Porto Alegre,Brazil.A tetrapolar bioelectrical impedance analysis device was used to evaluate cellularity and hydration and to perform the BIVA.The BIVA graphic was elaborated by software and for statistical analysis a significance level of 5%(P≤0.05)was considered.RESULTS One hundred and ninety patients,61.1%males,with a mean age of 56.6±11.0 years,were evaluated.Of these,56.3%had Child-Turcotte-Pugh(CTP)A score,and the prevalent etiology was hepatitis C virus(47.4%).The patients were classified according to cellularity and hydration by the quadrants and ellipses of the BIVA method,quadrant 1(47.9%);quadrant 2(18.9%);quadrant 3(14.2%);and quadrant 4(18.9%).Those classified in quadrant 1 and 2 had a higher phase angle compared to those in quadrants 3 and 4(P<0.001).Quadrant 2 patients had a lower average age than the other groups.The association with CTP score showed that patients in quadrant 2 had a higher proportion of CTP A,and those in quadrant 4 had a higher proportion of CTP C(P<0.052).CONCLUSION The BIVA method allows identification of the cellularity and hydration status of cirrhotic patients,and its association with clinical factors determines the disease severity,age and prognostic index.展开更多
For the multi-frequency acoustic analysis, a series expansion method has been introduced to reduce the computation time of the frequency-independent parts, but the Runge phenomenon will arise when this method is emplo...For the multi-frequency acoustic analysis, a series expansion method has been introduced to reduce the computation time of the frequency-independent parts, but the Runge phenomenon will arise when this method is employed in high frequency band. Therefore, this method is improved by analyzing the application condition and proposing the selection principle of the series truncation number. The argument interval can be adjusted with the wavenumber factor. Therefore, the problem of unstable numeration and poor precision can be solved, and the application scope of this method is expanded. The numerical example of acoustic radiation shows that the improved method is correct for acoustic analysis in wider frequency band with less series truncation number and computation amount.展开更多
Background: The segmental multi-frequency bioelectrical impedance analysis (SMF-BIA) is a useful method for evaluating physical health and nutritional status in various clinical settings. But less is known about its r...Background: The segmental multi-frequency bioelectrical impedance analysis (SMF-BIA) is a useful method for evaluating physical health and nutritional status in various clinical settings. But less is known about its role in the preoperative assessment of breast cancer patients. Herein, we try to monitor the changes in body composition of preoperative patients by SMF-BIA and figure out its association with clinical features. Methods: The changes in body composition were monitored by SMF-BIA in 563 female patients with breast cancer. Monitor body moisture and collect relevant data on the day before surgery as a prospective study. Retrospective analysis will be conducted based on preoperative data and pathological results after lymph node resection, Spearman’s correlation coefficients were calculated to investigate the correlation among parameters. Results: We found that the body water, extracellular water ratio, and bioelectrical impedance of the affected upper limbs of patients with different tumor stages or different numbers of lymph node metastases were significantly different from those of their healthy upper limbs (P P P P P Conclusion: SMF-BIA can help monitor the changes in body composition of breast cancer patients and provide detailed information for making a personalized treatment plan and individual nursing schedule. However, the value of SMF-BIA in preoperative assessment still needs to be validated in large prospective clinical trials.展开更多
目的探讨生物电阻抗分析法(BIA)指导超滤量同常规临床方法相比对血液透析患者残余肾功能(RRF)的影响。方法计算机检索2022年12月31日前发表在PubMed、Cochrane Library、Embase、Web of Science等英文数据库以及中国知网、维普数据库、...目的探讨生物电阻抗分析法(BIA)指导超滤量同常规临床方法相比对血液透析患者残余肾功能(RRF)的影响。方法计算机检索2022年12月31日前发表在PubMed、Cochrane Library、Embase、Web of Science等英文数据库以及中国知网、维普数据库、万方医学和中国生物医学文献数据库等中文数据库,探讨应用BIA指导超滤量同常规临床方法相比对血液透析患者RRF影响的随机对照试验(RCT),采用RevMan 5.4软件进行meta分析。结果最终纳入6篇文献,共计406名受试者。meta分析结果显示随访结束后BIA指导组的患者RRF(P<0.05,MD=1.15,95%CI:1.00~1.31)、24 h尿量(P<0.05,MD=253.56,95%CI:229.17~277.96)均高于对照组,超滤量(P<0.05,MD=-0.45,95%CI:-0.65~-0.26)及舒张压(P<0.05,MD=-5.52,95%CI:-7.58~-3.47)均低于对照组;两组患者的收缩压(P>0.05,MD=-0.25,95%CI:-7.70~7.21)、体质量(P>0.05,MD=-0.01,95%CI:-3.38~3.37)、白蛋白(P>0.05,MD=0.41,95%CI:-1.61~2.43)比较,差异均无统计学意义。结论基于现有研究,在营养管理及容量管理过程中采用BIA指导超滤量同常规临床方法相比有助于保护血液透析患者的RRF。展开更多
目的探讨运用直接节段多频生物电阻抗分析方法(direct segmental multi-frequency bioimpedance analysis:DSM-BIA)评估维持性血液透析患者全身容量负荷变化的准确性。方法应用DSM-BIA测量患者单次血液透析前全身总水量(Total body wate...目的探讨运用直接节段多频生物电阻抗分析方法(direct segmental multi-frequency bioimpedance analysis:DSM-BIA)评估维持性血液透析患者全身容量负荷变化的准确性。方法应用DSM-BIA测量患者单次血液透析前全身总水量(Total body water by DSM-BIA before hemodialysis:TBWDSM-pre)及透析后全身总水量(Total body water by DSM-BIA after hemodialysis:⊿TBWDSM-post);同时应用以整体踝腕法为基础的人体构成频谱方程(body composition spectroscopy equations:BCSE)来计算透析前TBW(⊿TBWBCSE-pre)、透析后TBW(⊿TBWBCSE-post);将透析前后实际体质量的变化值当做实际脱水量(actualul trafiltration volume:AUV);分别将DSM-BIA、BCSE2种方法所得透析前后TBW的差值与AUV比较。结果由DSM-BIA测量透析前后体质量的变化与AUV有统计学差异(2.32±1.1与2.65±1.04L,t=2.962,P<0.01)。DSM-BIA测得透析前后TBW的差值与AUV有较好的一致性,虽然会低估AUV(-0.3±1.4L),不过相较于BCSE(-0.65±1.65L),DSM-BIA对AUV的评估更加准确。结论与BCSE方法相比,DSM-BIA可以更准确反应维持性血液透析患者的全身容量负荷的变化。展开更多
文摘BACKGROUND Malnutrition in cirrhotic patients is correlated with mortality and a better response to liver transplantation.However,recovery of the nutritional status in these patients is a challenge due to the difficulty in establishing a reliable nutritional diagnosis.The bioelectrical impedance vector analysis(BIVA)method appears as a feasible tool in clinical practice to define the physiological state of cirrhotic patients by assessing hydration and body cellularity.AIM To evaluate body composition in cirrhotic patients using BIVA.METHODS This retrospective cross-sectional study was carried out by following cirrhotic outpatients at a hospital in Porto Alegre,Brazil.A tetrapolar bioelectrical impedance analysis device was used to evaluate cellularity and hydration and to perform the BIVA.The BIVA graphic was elaborated by software and for statistical analysis a significance level of 5%(P≤0.05)was considered.RESULTS One hundred and ninety patients,61.1%males,with a mean age of 56.6±11.0 years,were evaluated.Of these,56.3%had Child-Turcotte-Pugh(CTP)A score,and the prevalent etiology was hepatitis C virus(47.4%).The patients were classified according to cellularity and hydration by the quadrants and ellipses of the BIVA method,quadrant 1(47.9%);quadrant 2(18.9%);quadrant 3(14.2%);and quadrant 4(18.9%).Those classified in quadrant 1 and 2 had a higher phase angle compared to those in quadrants 3 and 4(P<0.001).Quadrant 2 patients had a lower average age than the other groups.The association with CTP score showed that patients in quadrant 2 had a higher proportion of CTP A,and those in quadrant 4 had a higher proportion of CTP C(P<0.052).CONCLUSION The BIVA method allows identification of the cellularity and hydration status of cirrhotic patients,and its association with clinical factors determines the disease severity,age and prognostic index.
基金supported by the National Natural Science Foundation of China(51379083,51479079,51579109)the Specialized Research Fund for the Doctoral Program of Higher Education of China(20120142110051)
文摘For the multi-frequency acoustic analysis, a series expansion method has been introduced to reduce the computation time of the frequency-independent parts, but the Runge phenomenon will arise when this method is employed in high frequency band. Therefore, this method is improved by analyzing the application condition and proposing the selection principle of the series truncation number. The argument interval can be adjusted with the wavenumber factor. Therefore, the problem of unstable numeration and poor precision can be solved, and the application scope of this method is expanded. The numerical example of acoustic radiation shows that the improved method is correct for acoustic analysis in wider frequency band with less series truncation number and computation amount.
文摘Background: The segmental multi-frequency bioelectrical impedance analysis (SMF-BIA) is a useful method for evaluating physical health and nutritional status in various clinical settings. But less is known about its role in the preoperative assessment of breast cancer patients. Herein, we try to monitor the changes in body composition of preoperative patients by SMF-BIA and figure out its association with clinical features. Methods: The changes in body composition were monitored by SMF-BIA in 563 female patients with breast cancer. Monitor body moisture and collect relevant data on the day before surgery as a prospective study. Retrospective analysis will be conducted based on preoperative data and pathological results after lymph node resection, Spearman’s correlation coefficients were calculated to investigate the correlation among parameters. Results: We found that the body water, extracellular water ratio, and bioelectrical impedance of the affected upper limbs of patients with different tumor stages or different numbers of lymph node metastases were significantly different from those of their healthy upper limbs (P P P P P Conclusion: SMF-BIA can help monitor the changes in body composition of breast cancer patients and provide detailed information for making a personalized treatment plan and individual nursing schedule. However, the value of SMF-BIA in preoperative assessment still needs to be validated in large prospective clinical trials.
文摘目的探讨运用直接节段多频生物电阻抗分析方法(direct segmental multi-frequency bioimpedance analysis:DSM-BIA)评估维持性血液透析患者全身容量负荷变化的准确性。方法应用DSM-BIA测量患者单次血液透析前全身总水量(Total body water by DSM-BIA before hemodialysis:TBWDSM-pre)及透析后全身总水量(Total body water by DSM-BIA after hemodialysis:⊿TBWDSM-post);同时应用以整体踝腕法为基础的人体构成频谱方程(body composition spectroscopy equations:BCSE)来计算透析前TBW(⊿TBWBCSE-pre)、透析后TBW(⊿TBWBCSE-post);将透析前后实际体质量的变化值当做实际脱水量(actualul trafiltration volume:AUV);分别将DSM-BIA、BCSE2种方法所得透析前后TBW的差值与AUV比较。结果由DSM-BIA测量透析前后体质量的变化与AUV有统计学差异(2.32±1.1与2.65±1.04L,t=2.962,P<0.01)。DSM-BIA测得透析前后TBW的差值与AUV有较好的一致性,虽然会低估AUV(-0.3±1.4L),不过相较于BCSE(-0.65±1.65L),DSM-BIA对AUV的评估更加准确。结论与BCSE方法相比,DSM-BIA可以更准确反应维持性血液透析患者的全身容量负荷的变化。
