Med Biol Eng Comput - Characterization of QT and RR interval series during acute myocardial ischemia by means of recurrence quantification analysis.

Tópicos

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Resumo

This study is aimed to investigate the nonlinear dynamic properties of the fluctuations in ventricular repolarization, heart rate and their correlation during acute myocardial ischemia. From 13 ECG records in long-term ST-T database, 170 ischemic episodes were selected with the duration of 34 s to 23 min 18 s, and two 5-min episodes immediately before and after each ischemic episode as non-ischemic ones for comparison. QT interval (QTI) and RR interval (RRI) were extracted and the ectopic beats were removed. Recurrence quantification analysis (RQA) was performed on QTI and RRI series, respectively, and cross recurrence quantification analysis (CRQA) on paired normalized QTI and RRI series. Wilcoxon signed-rank test was used for statistical analysis. Results revealed that the RQA indexes for QTI and HRI series had the same changing trend during ischemia with more significantly changed indexes in QTI series. In the CRQA, indexes related to the vertical and horizontal structures in recurrence plot significantly increased, representing decreased dependency of QTI on RRI. Both QTI and RRI series showed reduced complexity during ischemia with higher sensitivity in ventricular repolarization. The weakened coupling between QTI and RRI suggests the decreased influence of sinoatrial node on QTI modulation during ischemia.

Resumo Limpo

studi aim investig nonlinear dynam properti fluctuat ventricular repolar heart rate correl acut myocardi ischemia ecg record longterm stt databas ischem episod select durat s min s two min episod immedi ischem episod nonischem one comparison qt interv qti rr interv rri extract ectop beat remov recurr quantif analysi rqa perform qti rri seri respect cross recurr quantif analysi crqa pair normal qti rri seri wilcoxon signedrank test use statist analysi result reveal rqa index qti hri seri chang trend ischemia signific chang index qti seri crqa index relat vertic horizont structur recurr plot signific increas repres decreas depend qti rri qti rri seri show reduc complex ischemia higher sensit ventricular repolar weaken coupl qti rri suggest decreas influenc sinoatri node qti modul ischemia

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