title: Multiresolution analysis of pathological changes in cerebral venous dynamics in newborn mice with intracranial hemorrhage: adrenorelated vasorelaxation.
abstract: Intracranial hemorrhage (ICH) is the major problem of modern neonatal intensive care. Abnormalities of cerebral venous blood flow (CVBF) can play a crucial role in the development of ICH in infants. The mechanisms underlying these pathological processes remain unclear; however it has been established that the activation of the adrenorelated vasorelaxation can be an important reason. Aiming to reach a better understanding of how the adrenodependent relaxation of cerebral veins contributes to the development of ICH in newborns, we study here the effects of pharmacological stimulation of adrenorelated dilation of the sagittal sinus by isoproterenol on the cerebral venous hemodynamics. Our study is performed in newborn mice at different stages of ICH using the laser speckle contrast imaging and wavelet analysis of the vascular dynamics of CVBF. We show that the dilation of the sagittal sinus with the decreased velocity of blood flow presides to the stress-induced ICH in newborn mice. These morphofunctional vascular changes are accompanied by an increased variance of the wavelet-coefficients in the areas of endothelial and non-endothelial (KATP-channels activity of vascular muscle) sympathetic components of the CVBF variability. Changes in the cerebral venous hemodynamics at the latent stage of ICH are associated with a high responsiveness of the sagittal sinus to isoproterenol quantifying by wavelet-coefficients related to a very slow region of the frequency domain. The obtained results certify that a high activation of the adrenergic-related vasodilatory responses to severe stress in newborn mice can be one of the important mechanisms underlying the development of ICH. Thus, the venous insufficiency with the decreased blood outflow from the brain associated with changes in the endothelial and the sympathetic components of CVBF-variability can be treated as prognostic criteria for the risk of ICH during the first days after birth.
authors.affiliation: Department of Physics, Saratov State University, Astrakhanskaya Str. 83, Saratov, 410012, Russia. Saratov State Technical University, Politehnicheskaya Str. 77, Saratov, 410054, Russia. Wuhan National Laboratory for Optoelectronics, Britton Chance Center for Biomedical Photonics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China.
authors.forename: A N
authors.initials: AN
authors.lastname: Pavlov
authors.forename: O V
authors.initials: OV
authors.lastname: Semyachkina-Glushkovskaya
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: O A
authors.initials: OA
authors.lastname: Bibikova
authors.forename: O N
authors.initials: ON
authors.lastname: Pavlova
authors.forename: Q
authors.initials: Q
authors.lastname: Huang
authors.forename: D
authors.initials: D
authors.lastname: Zhu
authors.forename: P
authors.initials: P
authors.lastname: Li
authors.forename: V V
authors.initials: VV
authors.lastname: Tuchin
authors.forename: Q
authors.initials: Q
authors.lastname: Luo
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002550:Cerebral Veins / Q000187:drug effects / Q000503:physiopathology*; D006439:Hemodynamics / Q000187:drug effects; D020300:Intracranial Hemorrhages / Q000209:etiology / Q000378:metabolism / Q000503:physiopathology*; D007545:Isoproterenol / Q000494:pharmacology; D051379:Mice; D018343:Receptors, Adrenergic, beta-2 / Q000378:metabolism*; D013016:Sound / Q000009:adverse effects; D013312:Stress, Physiological / Q000187:drug effects; D014664:Vasodilation / Q000187:drug effects
chemical_list: D018343:Receptors, Adrenergic, beta-2; D007545:Isoproterenol