scholarly journals Cerebral Blood Flow in Low Intracranial Pressure Headaches—What Is Known?

2019 ◽  
Vol 10 (1) ◽  
pp. 2
Author(s):  
Magdalena Nowaczewska ◽  
Henryk Kaźmierczak
Keyword(s):  
Blood Flow ◽  
Cerebrospinal Fluid ◽  
Cerebral Blood Flow ◽  
Intracranial Pressure ◽  
Intracranial Hypertension ◽  
Intracranial Hypotension ◽  
Csf Pressure ◽  
Cerebral Vasodilatation ◽  
The Relationship ◽  
The Brain

Headaches attributed to low cerebrospinal fluid (CSF) pressure are described as orthostatic headaches caused by spontaneous or secondary low CSF pressure or CSF leakages. Regardless of the cause, CFS leaks may lead to intracranial hypotension (IH) and influence cerebral blood flow (CBF). When CSF volume decreases, a compensative increase in intracranial blood volume and cerebral vasodilatation occurs. Sinking of the brain and traction on pain-sensitive structures are thought to be the causes of orthostatic headaches. Although there are many studies concerning CBF during intracranial hypertension, little is known about CBF characteristics during low intracranial pressure. The aim of this review is to examine the relationship between CBF, CSF, and intracranial pressure in headaches assigned to low CSF pressure.

Idiopathic intracranial hypertension without intracranial hypertension

2020 ◽  
pp. 10.1212/CPJ.0000000000001022
Author(s):  
Mattia Sansone ◽  
Michelangelo De Angelis ◽  
Leonilda Bilo ◽  
Vincenzo Bonavita ◽  
Roberto De Simone
Keyword(s):  
Physical Activity ◽  
Cerebrospinal Fluid ◽  
Intracranial Pressure ◽  
Intracranial Hypertension ◽  
Idiopathic Intracranial Hypertension ◽  
Valsalva Manoeuvre ◽  
Dural Sinus ◽  
Daily Fluctuation ◽  
Csf Pressure ◽  
Postural Changes

The intracranial pressure (ICP) show large daily fluctuation, mainly due to postural changes and physical activity (e.g. it goes up to 470 mmH2O under Valsalva manoeuvre1). Consequently, the dural sinus must be sufficiently rigid in order to avoid its collapse during cerebrospinal fluid (CSF) pressure peaks. Hereby, we describe a patient with collapsible dural sinus associated with an intracranial hypertension syndrome without a detectable raised ICP, suggesting that a number of crucial assumptions on idiopathic intracranial hypertension with (IIH) or without papilledema (IIHWOP) might be discussed.

Autoregulation of cerebral blood flow after experimental fluid percussion injury of the brain

1980 ◽  
Vol 53 (4) ◽  
pp. 500-511 ◽  
Author(s):  
W. Lewelt ◽  
L. W. Jenkins ◽  
J. Douglas Miller
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Brain Injury ◽  
Intracranial Pressure ◽  
Severe Injury ◽  
Content Type ◽  
Fluid Percussion ◽  
Arterial Blood ◽  
Fluid Percussion Injury ◽  
The Brain

✓ To test the hypothesis that concussive brain injury impairs autoregulation of cerebral blood flow (CBF), 24 cats were subjected to hemorrhagic hypotension in 10-mm Hg increments while measurements were made of arterial and intracranial pressure, CBF, and arterial blood gases. Eight cats served as controls, while eight were subjected to mild fluid percussion injury of the brain (1.5 to 2.2 atmospheres) and eight to severe injury (2.8 to 4.8 atmospheres). Injury produced only transient changes in arterial and intracranial pressure, and no change in resting CBF. Impairment of autoregulation was found in injured animals, more pronounced in the severe-injury group. This could not be explained on the basis of intracranial hypertension, hypoxemia, hypercarbia, or brain damage localized to the area of the blood flow electrodes. It is, therefore, concluded that concussive brain injury produces a generalized loss of autoregulation for at least several hours following injury.

scholarly journals RheoSens; RheoPatch

2020 ◽  
Author(s):  
Tariq H. Khan
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Intracranial Pressure ◽  
Minimally Invasive ◽  
Brain Injuries ◽  
Tissue Oxygenation ◽  
Traumatic Brain Injuries ◽  
Invasive Device ◽  
The Brain ◽  
Minimally Invasive Device

Rheo Probe is a minimally invasive device, implanted in the brain matter for patients in a coma following brain haemorrage or traumatic brain injuries to measure cerebral blood flow, intracranial pressure, temperature and oxygenation parameters. Nearinfrared sensors assess levels of tissue oxygenation as well as cerebral blood flow by measuring oxygenated and deoxygenated hemoglobin based on spectrometry.

scholarly journals Modelling the Ability of Rheoencephalography to Measure Cerebral Blood Flow

2019 ◽  
Vol 5 (1) ◽  
pp. 110-113 ◽  
Author(s):  
Konstantin S. Brazovskii ◽  
Jacov S. Pekker ◽  
Oleg S. Umanskii
Keyword(s):  
Blood Flow ◽  
Cerebrospinal Fluid ◽  
Electrical Resistivity ◽  
Cerebral Blood Flow ◽  
Potential Benefit ◽  
Human Head ◽  
Element Model ◽  
History Of ◽  
Electrode Method ◽  
The Brain

Abstract Despite the long history of rheoencephalography (REG), some important aspects of the method are still debatable. Bioimpedance measurements offer great potential benefit for study of the human brain, but the traditional four or six electrode method suffers from potential misinterpretations and lack of accuracy. The objective of this paper is to study the possible mechanism of REG formation by means of numerical modelling using a realistic finite element model of the human head. It is shown that the cardiac related variations in electrical resistivity of the scalp contributes more than 60% to the REG amplitude, whereas the brain and cerebrospinal fluid are mutually compensated by each over.

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