Causal relationship between slow waves of arterial, intracranial pressures and blood velocity in brain. 2021

Isabel Martinez-Tejada, and Marek Czosnyka, and Zofia Czosnyka, and Marianne Juhler, and Peter Smielewski
Rigshospitalet, Clinic of Neurosurgery, Blegdamsvej 9, Copenhagen, 2100, Denmark; Technical University of Denmark, Department of Health Technology, Orsteds Pl. 345C, Kongens Lyngby, 2800, Denmark. Electronic address: isita.martinez93@gmail.com.

Slow vasogenic waves in arterial blood pressure (ABP), intracranial pressure (ICP) and cerebral blood flow velocity (FV) carry information on multiple brain homeostatic control mechanisms. This work presents an approach to evaluate causal relation between oscillatory modes of these signals as an alternative to time or frequency domain Granger analysis. Forty-five patients with simultaneous recordings of ICP, ABP and FV during CSF infusion studies were examined retrospectively. Each time series was decomposed into ten intrinsic mode functions (IMFs) via Ensemble Empirical Mode Decomposition (EEMD) and, afterwards, Granger causality (GC) was computed. Slow waves of ICP, ABP and FV were reconstructed from mode functions IMF6-9 of each time series, covering a frequency range between 0.013 and 0.155 Hz. Most significant connections were from FV to ICP, being stronger during elevation of mean ICP during infusion study. No G-causality was found between any of the IMFs during the baseline phase. Nonlinearity and nonstationarity of the cerebral and systemic signals can be addressed using EEMD decomposition There is a causal influence of slow waves of FV on slow waves on ICP during the plateau phase of the infusion study for a frequency band between 0.095 and 0.155 Hz. This relationship is magnified during mild intracranial hypertension.

UI MeSH Term Description Entries
D007427 Intracranial Pressure Pressure within the cranial cavity. It is influenced by brain mass, the circulatory system, CSF dynamics, and skull rigidity. Intracerebral Pressure,Subarachnoid Pressure,Intracerebral Pressures,Intracranial Pressures,Pressure, Intracerebral,Pressure, Intracranial,Pressure, Subarachnoid,Pressures, Intracerebral,Pressures, Intracranial,Pressures, Subarachnoid,Subarachnoid Pressures
D001783 Blood Flow Velocity A value equal to the total volume flow divided by the cross-sectional area of the vascular bed. Blood Flow Velocities,Flow Velocities, Blood,Flow Velocity, Blood,Velocities, Blood Flow,Velocity, Blood Flow
D001794 Blood Pressure PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS. Systolic Pressure,Diastolic Pressure,Pulse Pressure,Pressure, Blood,Pressure, Diastolic,Pressure, Pulse,Pressure, Systolic,Pressures, Systolic
D001921 Brain The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM. Encephalon
D002560 Cerebrovascular Circulation The circulation of blood through the BLOOD VESSELS of the BRAIN. Brain Blood Flow,Regional Cerebral Blood Flow,Cerebral Blood Flow,Cerebral Circulation,Cerebral Perfusion Pressure,Circulation, Cerebrovascular,Blood Flow, Brain,Blood Flow, Cerebral,Brain Blood Flows,Cerebral Blood Flows,Cerebral Circulations,Cerebral Perfusion Pressures,Circulation, Cerebral,Flow, Brain Blood,Flow, Cerebral Blood,Perfusion Pressure, Cerebral,Pressure, Cerebral Perfusion
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012189 Retrospective Studies Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons. Retrospective Study,Studies, Retrospective,Study, Retrospective
D062186 Arterial Pressure The blood pressure in the ARTERIES. It is commonly measured with a SPHYGMOMANOMETER on the upper arm which represents the arterial pressure in the BRACHIAL ARTERY. Aortic Blood Pressure,Aortic Pressure,Aortic Pulse Pressure,Aortic Tension,Arterial Blood Pressure,Arterial Tension,Blood Pressure, Aortic,Blood Pressure, Arterial,Mean Aortic Pressure,Mean Arterial Pressure,Aortic Blood Pressures,Aortic Pressure, Mean,Aortic Pressures,Aortic Pressures, Mean,Aortic Pulse Pressures,Aortic Tensions,Arterial Blood Pressures,Arterial Pressure, Mean,Arterial Pressures,Arterial Pressures, Mean,Arterial Tensions,Blood Pressures, Aortic,Blood Pressures, Arterial,Mean Aortic Pressures,Mean Arterial Pressures,Pressure, Aortic,Pressure, Aortic Blood,Pressure, Aortic Pulse,Pressure, Arterial,Pressure, Arterial Blood,Pressure, Mean Aortic,Pressure, Mean Arterial,Pressures, Aortic,Pressures, Aortic Blood,Pressures, Aortic Pulse,Pressures, Arterial,Pressures, Arterial Blood,Pressures, Mean Aortic,Pressures, Mean Arterial,Pulse Pressure, Aortic,Pulse Pressures, Aortic,Tension, Aortic,Tension, Arterial,Tensions, Aortic,Tensions, Arterial

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