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Two groups of subjects (21 healthy, 21 hypertensive patients) were tested during two measurement protocols (exercise, tilt). Two models of QT-RR coupling were tested — linear (LM) and nonlinear (NLM). QTc reproducibility was used as evidence of model validity. Results: LM was significantly better (lower QTc irreproducibility) than NLM (P<0.01) during the tilt-table test. The differences were not...
This paper presents a method for time-frequency representation of ultra-high-frequency components in the QRS complex in high-sensitivity and high-frequency electrocardiography signal measurement. Time-frequency interpretation forms shapes that look like fire — FLAMES. The width, intensity and position of FLAMES characterise the electrical properties of the human heart. FLAMES are able to differentiate...
This study introduces a method for the automatic extraction of the child's R-wave positions from a non-invasive multi-channel fetal ECG (FECG) record (according to the CinC 2013 Challenge). The method is based on eliminating the influence of the mother's heartbeats, defining the presumed multi-channel shape of the child's R-wave and its recognition in the record. The method is programmed using the...
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