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Impairments of cerebral blood flow microcirculation in rats brought on by cardiac cessation and respiratory arrest |
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| Authors: | Gennadii Piavchenko Igor Kozlov Viktor Dremin Dmitry Stavtsev Evgeniya Seryogina Ksenia Kandurova Valery Shupletsov Konstantin Lapin Alexander Alekseyev Sergey Kuznetsov Alexander Bykov Andrey Dunaev Igor Meglinski |
| Institution: | 1. Department of Histology, Cytology and Embryology, I.M. Sechenov First Moscow State Medical University, Moscow, Russia;2. R&D Center of Biomedical Photonics, Orel State University, Orel, Russia;3. Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia;4. R&D Center of Biomedical Photonics, Orel State University, Orel, Russia
Institute of Biomedical Systems, National Research University of Electronic Technology (MIET), Zelenograd, Russia;5. V.A. Negovsky Scientific Research Institute of General Reanimatology, Federal Research and Clinical Centre of Intensive Care Medicine and Rehabilitology, Moscow, Russia;6. Opto-Electronics and Measurement Techniques, Faculty of Information and Electrical Engineering, University of Oulu, Oulu, Finland;7. Cell Physiology and Pathology Laboratory, Orel State University, Orel, Russia R&D Center of Biomedical Photonics, Orel State University, Orel, Russia |
| Abstract: | The impairments of cerebral blood flow microcirculation brought on by cardiac and respiratory arrest were assessed with multi-modal diagnostic facilities, utilising laser speckle contrast imaging, fluorescence spectroscopy and diffuse reflectance spectroscopy. The results of laser speckle contrast imaging show a notable reduction of cerebral blood flow in small and medium size vessels during a few minutes of respiratory arrest, while the same effect was observed in large sinuses and their branches during the circulatory cessation. Concurrently, the redox ratio assessed with fluorescence spectroscopy indicates progressing hypoxia, NADH accumulation and increase of FAD consumption. The results of diffuse reflectance spectra measurements display a more rapid grow of the perfusion of deoxygenated blood in case of circulatory impairment. In addition, consequent histopathological analysis performed by using new tissue staining procedure developed in-house. It shows notably higher reduction of size of the neurons due to their wrinkling within brain tissues influenced by circulation impair. Whereas, the brain tissues altered with the respiratory arrest demonstrate focal perivascular oedema and mild hypoxic changes of neuronal morphology. Thus, the study suggests that consequences of a cessation of cerebral blood flow become more dramatic and dangerous compare to respiratory arrest. |
| Keywords: | brain imaging cardiac cessation cerebral blood flow laser speckle contrast microcirculation respiratory arrest |