Lollini V.A.*, Naumenko A.A.**, Lollini S.V.***
Processes and factors involved in the rheographic curve formation
*Education Establishment "Vitebsk State Order of Peoples’ Friendship Medical University", Republic of Belarus
**Education Establishment "Vitebsk State Technological University", Republic of Belarus
***Education Establishment "Vitebsk State University Named after P.M. Masherov", Republic of Belarus
Abstract.
Rheography method strongly entrenched in a store of means to assess the functional state of the heart and various vascular areas of the body is widely used in clinical and experimental practice because it is easy in use and not invasive. However, the techniques and ways of the obtained results analysis are non-standard and very diverse. In our opinion, it is due to the employment of incorrect premises of the assessment of those processes and factors which form the basis of this method.
The purpose of this study was to determine (on the ground of dimensional analysis) the minimum number and relationship of factors involved in the rheographic curve formation. Using Buckingham theorem and -theorem we have proved that the origin of this curve can be explained by the following factors: the resistivity of blood, its existent mass, the rate of volume change, the viscosity of blood, vessels diameter. Excluding any of these factors makes it impossible to formulate an equation describing the rheogram. The most significant impact on the value of the rheographic signal is exerted by the diameter of blood vessels and blood viscosity, it being of great diagnostic importance. In the rheographic process the unity of research method characteristics, the process under study and the conditions of its proceeding is observed.
Key words: rheography, methods of analysis.
References
1. Corciovă C, Turnea M, Matei D, Andritoi D. Evolution of cardiac parameters using electrical impedance pletysmography. Rev Med Chir Soc Med Nat Iasi. 2012 Jul-Sep;116(3):927-32.
2. Mašanauskienė E, Sadauskas S, Naudžiūnas A, Unikauskas A, Stankevičius E. Impedance Plethysmography as an alternative metod for the diagnosis of peripheral arterial disease. Medicina (Kaunas). 2014;50(6):334-9.
3. Theodor M, Ruh D, Ocker M, Spether D, Förster K, Heilmann C, Beyersdorf F, Manoli Y, Zappe H, Seifert A. Implantable impedance Plethysmography. Sensors (Basel). 2014 Aug;14(8):14858-72.
4. Naumenko AI, Skotnikov VV. Osnovy elektropletizmografii [Elektropletizmografiya bases]. Leningrad, RF: Meditsina; 1975. 216 р.
5. Popov AA, Chugui AM. Reografiia s vozmozhnost'iu opredeleniia raznosti faz [Reografiya with possibility of definition of a difference of phases]. Elektronika i sviaz'. 2013;(2):46-52.
6. Zelikson BB. Izmeneniia elektroprovodnosti potoka krovi, dvizhushchegosia s peremennoi skorost'iu [Changes of conductivity of the stream of a blood moving with variable rate]. Fiziologicheskii zhurnal SSSR im. I. M. Sechenova. 1973;59(10):1508-15.
7. Mazhbich BI, Matveev PV, Raifman MD. Rol' izmenenii ob"ema krovi i lineinoi skorosti ee dvizheniia v formirovanii pul'sovykh kolebanii elektricheskogo impedansa [A role of changes of volume of a blood and linear rate of its movement in formation of pulse fluctuations of an electric impedance]. Fiziologicheskii zhurnal SSSR im. I. M. Sechenova. 1981;67(8):1237-44.
8. Kedrov AA. Popytka kolichestvennoi otsenki tsentral'nogo i perifericheskogo krovoobrashcheniia elektricheskim putem [Attempt of a quantitative assessment of the central and peripheric circulation in the electric way]. Klinicheskaia meditsina. 1948;26(5):32-51.
9. Petrash VV, Lazarev SM, Danilov EN. Mekhanizmy formirovaniia intravaskuliarnoi reopletizmogrammy v sisteme legochnoi arterii [Mechanisms of formation of an intravaskulyarny reopletizmogramma in system of a pulmonary artery]. Vestnik khirurgii. 1981;126(6):6-10.
10. Sokolova IV, Yarullin KhKh. Informativnost' metoda dvukhkomponentnogo analiza reogrammy [Informational content of a method of the two-component analysis of a rheogram]. Klinicheskaia meditsina. 1983;(7):94-101.
11. Sherman DM, Bordiuzhenko II, Rodionov VI. Zavisimost' znachenii mezhelektrodnogo impedansa ot lokalizatsii i ploshchadi elektrodov, chastoty i sily izmeritel'nogo toka [Dependence of values of an interelectrode impedance on localization and area of electrodes, frequencies and forces of measuring current]. Novosti meditsinskoi tekhniki. 1976;4:8.
12. Yarullin KhKh. Klinicheskaia reoentsefalografiia [Clinical rheoencephalography]. Moscow, RF: Meditsina; 1967. 276 р.
13. Shenk Kh. Teoriia inzhenernogo eksperimenta [Theory of engineering experiment]. Moscow, RF: Mir; 1972. 381 р.
14. Kuznetsov NI. Mezhdunarodnaia sistema edinits (SI) [International system of units (SI)]: ucheb. posobie dlia vuzov. 2-e izd., ispr. i dop. Minsk, RB: Vysshaia shkola; 1965. 96 р.
