J Clin Monit Comput - Poincar? plot analysis of autocorrelation function of RR intervals in patients with acute myocardial infarction.


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The Poincar? plot of RR intervals (RRI) is obtained by plotting RRIn+1 against RRIn. The Pearson correlation coefficient (RRI), slope (SRRI), Y-intercept (YRRI), standard deviation of instantaneous beat-to-beat RRI variability (SD1RR), and standard deviation of continuous long-term RRI variability (SD2RR) can be defined to characterize the plot. Similarly, the Poincar? plot of autocorrelation function (ACF) of RRI can be obtained by plotting ACFk+1 against ACFk. The corresponding Pearson correlation coefficient (ACF), slope (SACF), Y-intercept (YACF), SD1ACF, and SD2ACF can be defined similarly to characterize the plot. By comparing the indices of Poincar? plots of RRI and ACF between patients with acute myocardial infarction (AMI) and patients with patent coronary artery (PCA), we found that the ACF and SACF were significantly larger, whereas the RMSSDACF/SDACF and SD1ACF/SD2ACF were significantly smaller in AMI patients. The ACF and SACF correlated significantly and negatively with normalized high-frequency power (nHFP), and significantly and positively with normalized very low-frequency power (nVLFP) of heart rate variability in both groups of patients. On the contrary, the RMSSDACF/SDACF and SD1ACF/SD2ACF correlated significantly and positively with nHFP, and significantly and negatively with nVLFP and low-/high-frequency power ratio (LHR) in both groups of patients. We concluded that the ACF, SACF, RMSSDACF/SDACF, and SD1ACF/SD2ACF, among many other indices of ACF Poincar? plot, can be used to differentiate between patients with AMI and patients with PCA, and that the increase in ACF and SACF and the decrease in RMSSDACF/SDACF and SD1ACF/SD2ACF suggest an increased sympathetic and decreased vagal modulations in both groups of patients.

Resumo Limpo

poincar plot rr interv rri obtain plot rrin rrin pearson correl coeffici rri slope srri yintercept yrri standard deviat instantan beattobeat rri variabl sdrr standard deviat continu longterm rri variabl sdrr can defin character plot similar poincar plot autocorrel function acf rri can obtain plot acfk acfk correspond pearson correl coeffici acf slope sacf yintercept yacf sdacf sdacf can defin similar character plot compar indic poincar plot rri acf patient acut myocardi infarct ami patient patent coronari arteri pca found acf sacf signific larger wherea rmssdacfsdacf sdacfsdacf signific smaller ami patient acf sacf correl signific negat normal highfrequ power nhfp signific posit normal lowfrequ power nvlfp heart rate variabl group patient contrari rmssdacfsdacf sdacfsdacf correl signific posit nhfp signific negat nvlfp lowhighfrequ power ratio lhr group patient conclud acf sacf rmssdacfsdacf sdacfsdacf among mani indic acf poincar plot can use differenti patient ami patient pca increas acf sacf decreas rmssdacfsdacf sdacfsdacf suggest increas sympathet decreas vagal modul group patient

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