Ziemssen Tjalf, Gasch Julia, Ruediger Heinz
Autonomic Lab, Department of Neurology, University Clinic Carl-Gustav Carus, Dresden University of Technology, Fetscherstr. 74, 01307 Dresden, Germany.
J Clin Monit Comput. 2008 Apr;22(2):159-68. doi: 10.1007/s10877-008-9117-0. Epub 2008 Mar 27.
To evaluate the impact of different ECG sampling frequencies on parameters of spectral and baroreflex analysis. Spectral and baroreflex analyses were performed in the EUROBAVAR data set (46 recordings of 23 persons) using the original ECG sampling frequency of 500 Hz and - simulated - sampling frequencies of 200 and 100 Hz. For this analysis, the technique of trigonometric regressive spectral (TRS) analysis was used. In the standing position, there were no statistically significant differences in baroreflex sensitivity and frequency bands ranging from VLF to HF using 100 Hz instead of the original 500 Hz. Only the UHF band (>0.40 Hz) was significantly different. In the supine position, similar results could be described for 100 Hz, although there were slight, but significant (P < 0.05) changes in baroreflex sensitivity of around 1 ms/mmHg at the simulated 100 Hz. Using a simulated 200 Hz instead of a 500 Hz sampling frequency had no significant impact on the spectral and baroreflex parameters. The probability to demonstrate an impact of different ECG sampling frequencies was higher in people with pathologically decreased variability of RR intervals. In most of the cases, it is sufficient for spectral and baroreflex analysis by TRS to use data with an ECG sampling frequency of 100 Hz in comparison to 500 Hz. Only if there is a pathologically decreased variability of RR intervals in patients, spectral and baroreflex parameters could be significantly influenced by lower ECG sampling frequencies of up to 100 Hz, but only to a minor degree.
评估不同心电图采样频率对频谱和压力反射分析参数的影响。在EUROBAVAR数据集中（23人共46份记录），使用原始的500 Hz心电图采样频率以及模拟的200 Hz和100 Hz采样频率进行频谱和压力反射分析。对于此分析，采用了三角回归频谱（TRS）分析技术。在站立位时，使用100 Hz而非原始的500 Hz时，压力反射敏感性以及从甚低频到高频的频段均无统计学显著差异。仅超高频频段（>0.40 Hz）存在显著差异。在仰卧位时，对于100 Hz可得出类似结果，尽管在模拟的100 Hz时压力反射敏感性有轻微但显著（P<0.05）的变化，约为1 ms/mmHg。使用模拟的200 Hz而非500 Hz采样频率对频谱和压力反射参数无显著影响。RR间期变异性病理性降低的人群中，显示不同心电图采样频率有影响的概率更高。在大多数情况下，与500 Hz相比，TRS进行频谱和压力反射分析时使用100 Hz心电图采样频率的数据就足够了。仅当患者RR间期变异性病理性降低时，低至100 Hz的心电图采样频率可能会对频谱和压力反射参数产生显著影响，但程度较小。
