scholarly journals Transcranial doppler methods in the assessment of cerebral vasomotor reactivity

2020 ◽  
Vol 73 (1-2) ◽  
pp. 21-28
Author(s):  
Aleksandra Lucic-Prokin ◽  
Petar Slankamenac ◽  
Pavle Kovacevic
Keyword(s):  
Transcranial Doppler ◽  
Cerebral Hemodynamics ◽  
Physiological Data ◽  
Invasive Approach ◽  
Arterial Perfusion ◽  
Advantages And Disadvantages ◽  
Non Invasive ◽  
Vasomotor Reactivity ◽  
Cerebral Vasomotor Reactivity ◽  
Ischemic Events

Introduction. Transcranial Doppler is the only non-invasive neuroimaging modality in the diagnosis and monitoring of various neurovascular diseases. Apart from assessing cerebral hemodynamics of blood flow in the basal brain arteries, transcranial Doppler provides physiological data and anatomical images. Quantification analysis of vasomotor reactivity. Various transcranial Doppler methods evaluate cerebral vasomotor reactivity, providing important information on the properties of arterioles under induced hemodynamic conditions. Exogenous and endogenous vasoactive stimuli of different potency (apnea, acetazolamide, carbon dioxide, L-arginine) are most commonly used, making transcranial Doppler a prognostic indicator of future ischemic events. This article reviews principles of various transcranial Doppler methods in the evaluation of vasomotor reactivity, emphasizing their advantages and disadvantages. Transcranial Doppler in the field of reduced vasomotor reactivity. Evaluation of vasomotor reactivity has a role in the prediction of future ischemic events, evaluation of revascularization effect after carotid endarterectomy, but also in the increasingly significant choice of the right time to perform it. In recent years, transcranial Doppler methods have found application in other areas of dysfunctional cerebral hemodynamics: dementia, hypertension, migraines, and sepsis. Conclusion. Due to an excellent temporal resolution, non-invasive approach, good cost-benefit ratio, bedside monitoring, relative simplicity in terms of interpretation and performance, and portability, transcranial Doppler in vasomotor reactivity may be the ideal tool in the evaluation of cerebral hemodynamics, arterial perfusion integrity and collateral capacity.

Increased Cerebral Vasomotor Reactivity in Migraine With Aura: An Autoregulation Disorder? A Transcranial Doppler and Near-Infrared Spectroscopy Study

Cephalalgia ◽  
2008 ◽  
Vol 28 (7) ◽  
pp. 689-695 ◽  
Author(s):  
F Vernieri ◽  
F Tibuzzi ◽  
P Pasqualetti ◽  
C Altamura ◽  
P Palazzo ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Migraine With Aura ◽  
Near Infrared Spectroscopy ◽  
Transcranial Doppler ◽  
Near Infrared ◽  
Cerebral Blood Volume ◽  
Cerebral Arteries ◽  
Invasive Approach ◽  
Vasomotor Reactivity ◽  
Haemoglobin Content

Migraine with aura (MA) is associated with changes in cerebral blood flow (CBF), whereas the role of cerebral autoregulation is uncertain. This study aimed to evaluate basal CBF, cerebral blood volume (CBV) and vasomotor reactivity (VMR) in MA patients. Twenty-one controls and 16 MA patients (eight with side predominance) underwent simultaneous examination of flow velocity in the middle cerebral arteries by transcranial Doppler (TCD) and of near-infrared spectroscopy (NIRS) parameters [oxygen haemoglobin saturation: oxygen%, and total haemoglobin content (THC)] at rest and after hypercapnia. Cerebral VMR, THC and oxygen% increases were significantly greater on the predominant compared with the non-predominant migraine side, with both sides of patients without side predominance and with controls. These findings suggest altered autoregulation in MA patients, possibly secondary to impaired cerebrovascular autonomic control. Simultaneous TCD and NIRS investigation could represent a non-invasive approach to evaluate cerebral haemodynamics at the cortical and subcortical level.

scholarly journals The use of transcranial Doppler sonography in a pediatric neurological clinic

1998 ◽  
Vol XXX (1-2) ◽  
pp. 65-65
Author(s):  
V. I. Guzeva ◽  
А. N. Trubacheva
Keyword(s):  
Transcranial Doppler ◽  
Arteriovenous Malformations ◽  
Doppler Sonography ◽  
High Efficiency ◽  
Transcranial Doppler Sonography ◽  
Cerebral Hemodynamics ◽  
Adult Patients ◽  
Vascular Pathology ◽  
Non Invasive

In the study of cerebral hemodynamics in children, methods that allow multiple non-invasive vascular examination are of great importance. The experience of using one of these methods - transcranial Doppler sonography (TCD) - in adult patients has shown its high efficiency in determining hemodynamically significant organic vascular pathology (occlusions, stenoses, vasospasm, aneurysms, and arteriovenous malformations).

scholarly journals Cerebral vasomotor reactivity assessment using Transcranial Doppler and MRI with apnea test

2016 ◽  
Vol 49 (11) ◽  
Author(s):  
C.R. Herrera Campos ◽  
G.C. Beltramini ◽  
W.M. Avelar ◽  
F.O. Lima ◽  
L.M. Li
Keyword(s):  
Transcranial Doppler ◽  
Apnea Test ◽  
Vasomotor Reactivity ◽  
Cerebral Vasomotor Reactivity

Cerebral hemodynamics during orthostatic stress assessed by nonlinear modeling

2006 ◽  
Vol 101 (1) ◽  
pp. 354-366 ◽  
Author(s):  
Georgios D. Mitsis ◽  
Rong Zhang ◽  
Benjamin D. Levine ◽  
Vasilis Z. Marmarelis
Keyword(s):  
Cerebral Blood Flow Velocity ◽  
Lower Body Negative Pressure ◽  
Nonlinear Modeling ◽  
Cerebral Hemodynamics ◽  
Cerebral Hypoperfusion ◽  
Orthostatic Stress ◽  
Cerebrovascular Reserve ◽  
Vasomotor Reactivity ◽  
Arterial Blood ◽  
Cerebral Vasomotor Reactivity

The effects of orthostatic stress, induced by lower body negative pressure (LBNP), on cerebral hemodynamics were examined in a nonlinear context. Spontaneous fluctuations of beat-to-beat mean arterial blood pressure (MABP) in the finger, mean cerebral blood flow velocity (MCBFV) in the middle cerebral artery, as well as breath-by-breath end-tidal CO2 concentration (PetCO2) were measured continuously in 10 healthy subjects under resting conditions and during graded LBNP to presyncope. A two-input nonlinear Laguerre-Volterra network model was employed to study the dynamic effects of MABP and PetCO2 changes, as well as their nonlinear interactions, on MCBFV variations in the very low (VLF; below 0.04 Hz), low (LF; 0.04–0.15 Hz), and high frequency (HF; 0.15–0.30 Hz) ranges. Dynamic cerebral autoregulation was described by the model terms corresponding to MABP, whereas cerebral vasomotor reactivity was described by the model PetCO2 terms. The nonlinear model terms reduced the output prediction normalized mean square error substantially (by 15–20%) and had a prominent effect in the VLF range, both under resting conditions and during LBNP. Whereas MABP fluctuations dominated in the HF range and played a significant role in the VLF and LF ranges, changes in PetCO2 accounted for a considerable fraction of the VLF and LF MCBFV variations, especially at high LBNP levels. The magnitude of the linear and nonlinear MABP-MCBFV Volterra kernels increased substantially above −30 mmHg LBNP in the VLF range, implying impaired dynamic autoregulation. In contrast, the magnitude of the PetCO2-MCBFV kernels reduced during LBNP at all frequencies, suggesting attenuated cerebral vasomotor reactivity under dynamic conditions. We speculate that these changes may reflect a progressively reduced cerebrovascular reserve to compensate for the increasingly unstable systemic circulation during orthostatic stress that could ultimately lead to cerebral hypoperfusion and syncope.

scholarly journals Cerebral vasomotor reactivity in border zone infarcts; a transcranial Doppler study

2019 ◽  
Vol 55 (1) ◽  
Author(s):  
Hossam Afify ◽  
Shahinaz M. Helmy ◽  
Lobna M. El-Nabil ◽  
Naglaa M. El-khayat ◽  
Nevine M. El Nahas ◽  
...  
Keyword(s):  
Transcranial Doppler ◽  
Border Zone ◽  
Vasomotor Reactivity ◽  
Doppler Study ◽  
Cerebral Vasomotor Reactivity
Sign in / Sign up

Export Citation Format

Share Document