Postural and longitudinal variability in seismocardiographic signals.
Postural and longitudinal variability in seismocardiographic signals.
复制标题
DOI：
10.1088/1361-6579/acb30e
复制
发表时间：
2023-02-27
影响因子：
3.2
通讯作者：
中科院分区：
文献类型：
--
作者：
Objective.在胸部表面上可检测到的低频心血管振动（称为心震描记术或SCG）可用于各种心血管状况的非侵入性诊断和监测。使用SCG进行纵向患者监测的潜在限制是受试者内变异性的存在，这可能导致计算SCG特征的错误。对受试者内变异性来源的贡献的更好理解可能会导致SCG效用的改善。本研究的目的是量化的姿势和纵向SCG的变异性在健康的休息科目在正常呼吸。Approach.在5个月的5次记录期间，在19名健康受试者中以不同姿势（仰卧、45°抬头和坐姿）纵向采集SCG和ECG信号。使用ECG R波分割SCG周期。无监督机器学习用于通过将SCG信号分组为具有最小化的簇内波形异质性的两个簇来减少由于呼吸引起的SCG变异性。几个SCG功能进行了评估，在不同的姿势和纵向。主要结果。在每个姿势和数据收集阶段，计算每个簇内（簇内）和两个簇之间（簇间）的SCG波形形态变异性。仰卧位和坐位之间的变异性有显著差异，但仰卧位和45°体位之间的变异性无显著差异。对于45°和坐姿，簇内变异性没有显著差异，而簇间变异性差异显著。计算了0.5-50 Hz中不同频带与总频谱能量之间的能量比，并且对于所有姿势都具有可比性。两个群集的组合心脏计时间期显示出显著的变化与姿势的变化。有显着的心率差异之间的集群和姿势的立场。纵向检查的SCG特征比较，所有特征均无显著性差异，有显著性意义。几个SCG功能显着不同的姿势，表明姿势需要指定时，比较SCG随时间的变化。纵向可比SCG特征值表明，如果观察到显著的纵向差异，则可能反映心脏功能随时间的真实变化。
Objective. Low frequency cardiovascular vibrations detectable on the chest surface (termed seismocardiography or SCG) may be useful for non-invasive diagnosis and monitoring of various cardiovascular conditions. A potential limitation of using SCG for longitudinal patient monitoring is the existence of intra-subject variability, which can contribute to errors in calculating SCG features. Improved understanding of the contribution of intra-subject variability sources may lead to improved SCG utility. This study aims to quantify postural and longitudinal SCG variability in healthy resting subjects during normal breathing. Approach. SCG and ECG signals were longitudinally acquired in 19 healthy subjects at different postures (supine, 45° head up, and sitting) during five recording sessions over five months. SCG cycles were segmented using the ECG R wave. Unsupervised machine learning was used to reduce SCG variability due to respiration by grouping the SCG signals into two clusters with minimized intra-cluster waveform heterogeneity. Several SCG features were assessed at different postures and longitudinally. Main results. SCG waveform morphological variability was calculated within each cluster (intra-cluster) and between two clusters (inter-cluster) at each posture and data collection session. The variabilities were significantly different between the supine and sitting but not between supine and 45° postures. For the 45° and sitting postures, the intra-cluster variability was not significantly different, while the inter-cluster variability difference was significant. The energy ratio between different frequency bands to total spectral energy in 0.5–50 Hz were calculated and were comparable for all postures. The combined cardiac timing intervals from the two clusters showed significant variation with postural changes. There was significant heart rate difference between the clusters and between postural positions. The SCG features were compared between longitudinal sessions and all features were not significantly different, Significance. Several SCG features significantly varied with posture suggesting that posture needs to be specified when comparing SCG changes over time. Longitudinally comparable SCG feature values suggests that significant longitudinal differences, if observed, may reflect true alternations in the cardiac functioning over time.
登录
查看更多内容
DOI：
10.1109/tassp.1978.1163055
发表时间：
1978-01-01
期刊：
IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING
影响因子：
--
作者：
SAKOE, H;CHIBA, S
通讯作者：
CHIBA, S
影响因子：
--
作者：
HIRSCH, JA;BISHOP, B
通讯作者：
BISHOP, B
影响因子：
4.6
作者：
PAN, J;TOMPKINS, WJ
通讯作者：
TOMPKINS, WJ
影响因子：
4.6
作者：
Shafiq, Ghufran;Tatinati, Sivanagaraja;Veluvolu, Kalyana C.
通讯作者：
Veluvolu, Kalyana C.
DOI：
10.1159/000470156
发表时间：
1994-01-01
期刊：
AMERICAN JOURNAL OF NONINVASIVE CARDIOLOGY
影响因子：
--
作者：
CROW, RS;HANNAN, P;SALERNO, DM
通讯作者：
SALERNO, DM