The time difference between the R-peak in the ECG waveform and the arrival of the blood pressure wave in the extremities is another measurement known as PTT. PTT involves simultaneous measurement of ECG and PPG. Figure 1-1. Introduction to ECG, PPG, and PTT Because the frequency of both ...
4. At one time, it was thought the heart pumped blood out of a large container as an "open system", but now it is known that blood "circulates" in a closed system. Using the idea of "Tentativeness", how can we determine which statement above is a scientific one? WHAT IS "EMERGING...