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Temporal stability of ambulatory stroke volume and cardiac output measured by impedance cardiography.

机译:动态心搏量和心输出量的时间稳定性通过阻抗心动图测量。

摘要

Recently, devices have become available that allow non-invasive measurement of stroke volume and cardiac output through ambulatory thorax impedance recording. If such recordings have adequate temporal stability, they offer great potential to further our understanding of how repeated or chronic cardiovascular activation in response to naturalistic events may contribute to cardiovascular disease. In this study, 24 h ambulatory impedance-derived systolic time intervals, stroke volume and cardiac output were measured in 65 healthy subjects across an average time span of 3 years and 4 months. Stability was computed separately for sleep and daytime recordings. To avoid confounding by differences in posture and physical activity across measurement days, temporal stability was computed using sitting activities only. During the day intraclass correlations were moderate for stroke volume (.29-.46) and cardiac output (.33-.46) and good for systolic time intervals (.55-.81). When test-retest comparison was limited to two comparable days (two work days or two leisure days), correlations for both SV (.42-.46) and CO (.43-.50) improved. Conclusion: Moderate long-term temporal stability is found for individual differences in ambulatory stroke volume and cardiac output measured by impedance cardiography. © 2005 Elsevier B.V. All rights reserved.
机译:近来,已经存在允许通过动态胸部阻抗记录来非侵入性地测量中风量和心输出量的设备。如果此类记录具有足够的时间稳定性,则它们将为我们进一步了解响应自然事件的反复或长期心血管激活可能导致心血管疾病提供巨大的潜力。在这项研究中,在65位健康受试者的3年和4个月的平均时间跨度中,测量了24小时动态阻抗产生的动态收缩时间间隔,中风量和心输出量。分别计算睡眠和白天记录的稳定性。为避免在整个测量日中姿势和身体活动的差异造成混淆,仅使用坐姿活动来计算时间稳定性。白天,类内相关性对卒中量(.29-.46)和心输出量(.33-.46)中等,对收缩期间隔(.55-.81)良好。当重测比较限于两个可比较的天(两个工作日或两个休闲日)时,SV(.42-.46)和CO(.43-.50)的相关性均得到改善。结论:通过阻抗心动图测得的步行性卒中量和心输出量的个体差异可发现适度的长期时间稳定性。 ©2005 Elsevier B.V.保留所有权利。

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