Only a single channel is used to record at the same time two curves, i.e., an ECG and a Rheo, from the ascending aorta.
This method makes it possible not only to measure 7 basic volumes of blood in every heart cycle phase, but also evaluate 12 functions of the cardiovascular system performance, so that, based on ANALYTICAL interpretation of the produced data, the relevant cause-effect relations are identified, and decisive pathological factors and their manifestations as a compensation mechanism, maintaining the proper hemodynamics in some phases are discovered, if any. This innovative method allows identifying actual margins in the operation of the cardiovascular system.

Parts of heart considered by diagnostics; heart anatomy pre-determination.Slide-supported lecture in phase analysis theory.

Of great importance is the scheme of location of the electrodes used for recording the relevant signals. The main factor in our case is a single channel lead to record signals from the aorta. The first electrode is placed within the area of the ascending aorta, at the top edge of the thorax. The second electrode is located on the median front line at the apex of the heart, at the bottom edge of the thorax. Two electrodes to pick up high-frequency signals from the rheograph are located in the neighborhood of the ECG electrodes. The passive electrode is fixed onto the abdomen surface area in the neighborhood of the Rheo electrode.

Why to apply this scheme?
 
This electrode location scheme for recording ECG signals has been developed on the basis of a great number of tests which have demonstrated that only the fix points proposed by us are the most suitable to deliver the relevant data on the phases of the aortic valve tension and opening, captured in our ECG version in full. And in this case, it is very important to locate the high-frequency signal electrodes near to the ECG electrodes, since the ECG electrodes are used to deliver the relevant signals for simultaneous recording an ECG and Rheo. In order to calculate hemodynamic parameters according to the equations by Poyedintsev – Voronova, it is essential and quite sufficient to measure durations of the respective heart cycle phases. By substituting the actual values of the durations into the above equations, we obtain the actual volumes of blood in every heart cycle phase.
The actual functional status of the heart and large blood vessels is analyzed according to an ECG signal amplitude and actual Rheo signal shape in every phase of the heart cycle under analysis.

Parameters considered by diagnostics

Cardiocode is designed to measure volumes of blood entering the heart during the myocardium relaxation and ventricle filling, and volumes of blood leaving the heart during the valve opening and aorta expanding, based on the fact, that the said volumes of blood circulate throughout the blood vessel system and provide transportation of blood corpuscles.

The measured parameters are as follows:
SV – stroke volume, ml;
MV – minute volume, l;
PV1 – volume of blood entering ventricle in premature diastole, characterizing the suction function of the ventricle, ml;
PV2 - volume of blood entering the left ventricle in atrial systole phase, characterizing the contraction function of the atrium, ml;
PV3 – volume of blood ejected by the left ventricle in rapid ejection phase, ml;
 
PV4 - volume of blood ejected by the left ventricle in slow ejection phase, ml;
 
PV5 – volume of blood (a share of SV) pumped by ascending aorta as peristaltic pump, characterizing the actual tonus of aorta, ml.
 
In addition, the following functions are evaluated qualitatively:
-         function of arteric valve
-         elasticity of aorta
-         expanding of ascending aorta
-         narrowing of aorta mouth
-         coronary flow status
-         contraction function of myocardium and septum
-         stenosis of large arteries available/not available
-         peculiarities of aortic valve anatomy
-         actual status of venous flow
-         if pre-stroke conditions available/not available
- synchronization in operation of greater and lesser circulation systems.
-   
 
It is And how to calculate the hemodynamic parameters?

possible to calculate the basic hemodynamic parameters using an ECG version recorded according to the single lead scheme. It can be made with our Cardiocode only. The single-lead ECG recording from the aorta produces the most informative curve. Upon recording of the ECG curve, the signal-related data are processed by our proprietary software used to calculate automatically the actual duration of every one of ten phases in every heart cycle recorded. 
The actual duration of every phase in the heart cycle is an argument in the respective equation for calculations of the hemodynamic parameters. Using these equations, produced are the actual values of all hemodynamic parameters as listed above.
Screen shot for Cardiocode operation Title “Analysis” 
Calculation of hemodynamic parameters is carried out automatically thereunder.