Webinar 3. Recording of ECG & RHEO of ascending aorta in practice. Cardiac cycle phase structure: new interpretation

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Webinar 3. Recording of ECG & RHEO of ascending aorta in practice. Cardiac cycle phase structure: new interpretation

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Summary

1. Recording of ECG & RHEO of ascending aorta in practice: use of an original single-lead system including placement of an electrode on the anterior median line within the heart apex area.


Fig. 1 Scheme of electrode arrangement for recording ECG & RHEO of ascending aorta

2. Analysis: cardiac cycle phase structure


Fig. 2. Cardiac cycle phase structure according to ECG & RHEO

3. ECG first derivative curve: tool No.1 for identifying each of the cardiac cycle phase boundary.


Fig.3. Basics of graphical differentiation in mathematics.

A local maximum (or a local minimum) of a derivative graph can be found out on the derivative curve as a function. At the local minimum or maximum point, we are dealing with energy change rate, i.e., energy decreasing or increasing. The same is applicable to our recorded curve: in this case, it reflects the maximum (or minimum) of the rate of changing process recorded.


Fig. 4. Derivative of a real ECG

4. Upon measuring durations of each cardiac cycle phase and substituting them into the hemodynamic equation by G. Poyedintsev – O. Voronova, the following 7 phase-related volumes of blood are calculated as listed below:
SV – stroke volume (ml);
MV – minute volume (l/min);
PV1 – volume of blood entering the ventricle in the early diastole (ml);
PV2 – volume of blood entering the left ventricle in the atrial systole (ml);
PV3 – volume of blood ejected by the ventricle during the rapid ejection phase (ml);
PV4 – volume of blood ejected by the ventricle during the slow ejection phase (ml);
PV5 – volume of blood (SV fraction) pumped by the ascending aorta as peristaltic pump (ml).

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