The present issue of our journal is of very special nature. We are constantly analyzing not only the readers’ focus of interest to the publications in our journal, but we are also tracing how cardiometry as a new science is realized by medical doctors and how they apply it in their practice. Undoubtedly, the mathematical fundamentals of hemodynamics are very difficult to understand not only by doctors, but even by mathematicians. Therefore, we have decided to collect in the first section of the present issue all the basic, previously published, mathematical concepts of hemodynamics as a complete collection part, in order to provide our readers with a convenient reference form. We think that this is an absolutely reasonable idea, since our journal always offers a thematic outline philosophy. We can see that it plays an important role in attracting the readers’ attention all over the world.