Lugovik I.A. APPROBATION OF THE METHOD FOR ASSESSING CEREBRAL BLOOD FLOW BY ULTRASOUND FLOWMETRY ON A MODEL OF UNILATERAL, PERMANENT CEREBRAL ISCHEMIA IN WISTAR RATS . Laboratory Animals for Science. 2022; 1. https://doi.org/10.29296/2618723X-2022-01-03
To determine the effectiveness of drugs aimed at the treatment of stroke, indirect indicators are usually used, indicating the processes of animal recovery. However, when evaluating the results of restoring cerebral circulation after pharmacological correction, it is advisable to quantify the blood flow velocity in real time, for example, using Doppler ultrasound.
The assessment of cerebrovascular accidents using this method is widely used in experimental studies, however, there is no standard protocol, and individual methodological approaches are developed in each laboratory. In this regard, it is advisable to adapt the method in a particular laboratory, taking into account the equipment, type and line of animals, as well as the model of induction of pathological changes.
The purpose of the work is to test the method for assessing cerebral blood flow using the method of ultrasonic flowmetry using a dopplerograph for monitoring blood flow (Net kit, ultrasonic computerized) MM-D-K «Minimax-Doppler-K» (OOO «SP Minimax», Russia) and a sensor with a frequency 25 MHz on the model of unilateral, permanent cerebral ischemia on male Wistar rats obtained from the nursery of RMC «Home оf Pharmacy» (Russia).
As part of the research, the values of the maximum systolic velocity (Vs, cm/s) and the average velocity per systole (Vas, cm/s) were determined, which are the most informative and frequently used markers in experiments when evaluating the pharmacological activity of drugs.
The dynamics of changes in parameters within 60 min after the induction of pathology was recorded in 11 animals. For a more complete assessment of variability, the analysis included baseline data and indicators immediately after the induction of pathology, obtained in other experiments with a similar design (n=93).
Based on the results of approbation of the method, it was shown that the cerebral blood flow velocity has a rather high variability, reference intervals were established for the background values of the blood flow velocity and immediately after the pathology induction, taking into account the recommendations of the Clinical and Laboratory Standards Institute (CLSI).
When analyzing the dynamics of both indicators of blood flow velocity, it was noted that throughout the experiment a significant decrease was achieved relative to the initial values.
At the 5th minute after the induction of the pathology, a fairly rapid recovery of indicators up to 70% of the initial values for Vs and 56% for Vas was revealed. At subsequent points, the speed stabilizes at 50% of the initial values.
This fact must be taken into account when planning the design of experiments to study the pharmacological activity of drugs that affect cerebral circulation, since if the drug is administered immediately after the induction of pathology, the pharmacological effect can be superimposed on the result of physiological recovery, which makes it difficult to assess the effect of the drug
Lugovik I.A. – data collection and analysis, experimental manipulations, data collection from literary sources, writing the text of the article.
Simonova E.V. – carrying out experimental manipulations.
Bernatskaya E.A. – carrying out experimental manipulations.
The authors declare no conflict of interest.