This paper presents case studies of ECG signals measured simultaneously and independently by two ECG devices. We explore what effect different placements of ECG electrodes have on the R wave of the QRS complex and how it should be taken into account when used as a reference signal in pulse transit time measurements of blood flow. Additionally, we study what kind of ECG electrode placements are most suitable for PTT measurements.
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Teemu S. Myllylä, Erkki V. Vihriälä, Vesa O. Korhonen, Hannu S. S. Sorvoja, "Case study of ECG signal used as a reference signal in optical pulse transit time measurement of blood flow: the effect of different electrode placements on pulse transit time," Proc. SPIE 8699, Saratov Fall Meeting 2012: Optical Technologies in Biophysics and Medicine XIV; and Laser Physics and Photonics XIV, 869903 (26 February 2013);