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The reduction of motion artifact in the ECG applications has become a more and more important issue. In this paper, we have successfully developed a novel motion artifact reduction method by the combination of G-sensor and skin-stretched sensor for the hardware and a master-slave multiple noise reduction algorithm for the software. A portable ECG system with our proposed noise reduction method can...
Cardiac electrical restitution is an important tool for evaluating risk of cardiac arrhythmias. Restitution slopes are used to quantify the rates of QT and DI (diastolic) interval adaptation in response to abrupt changes in cardiac cycle or RR intervals. These slopes can be either measured experimentally using invasive stepwise pacing procedures or assessed clinically from surface ECG. However, acquiring...
Our aims were to assess: 1) the variability of the systolic and diastolic periods, estimated by the electromechanical interval measured from the R wave to the systolic peak of the pressure wave (RPre), and the interval from this peak to the next R wave (PreR), respectively; 2) the effect of two maneuvers on the variability of these periods. ECG, arterial pressure and respiration were recorded from...
For two non-invasive measurements, Pulse Wave Velocity by Digital Volume Pulse and Pulse Wave Velocity by Digital Volume Pulse Easy, only a few minutes are needed for self arterial stiffness assessment. But since they have some limitations for those who are not healthy, ECG is used in this study are the common reference point for performance enhancement. Fifteen subjects without cardiovascular disease...
Very little works have been done on PR intervals, undoubtedly because this signal is difficult to extract and process, as in exercise tests where T-P fusion occurs during higher heart rates, what makes this problem still interesting. The common approach for the estimation of PR interval during both exercise and recovery is to determine the latency using the detection of the maximum of cross correlation...
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