Temporal stability of ambulatory stroke volume and cardiac output measured by impedance cardiography
Temporal stability of ambulatory stroke volume and cardiac output measured by impedance cardiography
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DOI：
10.1016/j.biopsycho.2005.08.004
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发表时间：
2006-04-01
影响因子：
2.6
通讯作者：
de Geus, EJC
中科院分区：
文献类型：
--
作者：
Goedhart, AD;Kupper, N;de Geus, EJC
最近，通过动态胸阻抗记录可以无创测量每搏输出量和心输出量的设备已经变得可用。如果这样的记录有足够的时间稳定性，他们提供了很大的潜力，进一步了解如何重复或慢性心血管激活，以响应自然事件可能会导致心血管疾病。在这项研究中，在平均3年4个月的时间跨度内，测量了65名健康受试者的24 It动态阻抗推导的收缩时间间期、每搏输出量和心输出量。分别计算睡眠和日间记录的稳定性。为了避免测量日之间姿势和身体活动差异的混淆，仅使用坐姿活动计算时间稳定性。在白天，组内相关性为每搏输出量（0.29 - 0.46）和心输出量（0.33 - 0.46）中等，收缩时间间期（0.55 - 0.81）良好。当重测比较限于两个可比较的日子（两个工作日或两个休闲日）时，SV（0.42 - 0.46）和CO（0.43 - 0.50）的相关性都有所改善。结论：通过阻抗心动图测量的动态每搏输出量和心输出量的个体差异存在中度长期时间稳定性。(c)2005 Elsevier B. V.保留所有权利。
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 It 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. (c) 2005 Elsevier B.V. All rights reserved.