Interobserver variability of cerebral blood flow measurements obtained using spectral analysis and technetium-99m labeled compounds

2003 ◽  
Vol 17 (3) ◽  
pp. 255-259 ◽  
Author(s):  
Masashi Takasawa ◽  
Kenya Murase ◽  
Naohiko Oku ◽  
Minoru Kawamata ◽  
Makoto Nagayoshi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Spectral Analysis ◽  
Cerebral Blood Flow ◽  
Interobserver Variability ◽  
Labeled Compounds ◽  
Flow Measurements ◽  
Technetium 99M ◽  
Blood Flow Measurements

Clinical Utility of Quantitative Cerebral Blood Flow Measurements during Internal Carotid Artery Test Occlusions

Neurosurgery ◽  
2002 ◽  
Vol 50 (5) ◽  
pp. 996-1005 ◽  
Author(s):  
Randolph S. Marshall ◽  
Ronald M. Lazar ◽  
William L. Young ◽  
Robert A. Solomon ◽  
Shailendra Joshi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Carotid Artery ◽  
Internal Carotid Artery ◽  
Clinical Utility ◽  
Internal Carotid ◽  
Flow Measurements ◽  
Blood Flow Measurements

Cerebral Vasoreactivity Assessed With Transcranial Doppler and Regional Cerebral Blood Flow Measurements

Stroke ◽  
1995 ◽  
Vol 26 (12) ◽  
pp. 2302-2306 ◽  
Author(s):  
Arve Dahl ◽  
David Russell ◽  
Kjell Rootwelt ◽  
Rolf Nyberg-Hansen ◽  
Emilia Kerty
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Transcranial Doppler ◽  
Regional Cerebral Blood Flow ◽  
Regional Cerebral Blood ◽  
Flow Measurements ◽  
Blood Flow Measurements ◽  
Cerebral Vasoreactivity

scholarly journals Improved brain perfusion after electrical cardioversion of atrial fibrillation

EP Europace ◽  
2019 ◽  
Vol 22 (4) ◽  
pp. 530-537 ◽  
Author(s):  
Marianna Gardarsdottir ◽  
Sigurdur Sigurdsson ◽  
Thor Aspelund ◽  
Valdis Anna Gardarsdottir ◽  
Lars Forsberg ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Atrial Fibrillation ◽  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Magnetic Resonance ◽  
Brain Perfusion ◽  
Resonance Imaging ◽  
Flow Measurements ◽  
Before And After ◽  
Blood Flow Measurements

Abstract Aims Atrial fibrillation (AF) has been associated with reduced brain volume, cognitive impairment, and reduced cerebral blood flow. The causes of reduced cerebral blood flow in AF are unknown, but no reduction was seen in individuals without the arrhythmia in a previous study. The aim of this study was to test the hypothesis that brain perfusion, measured with magnetic resonance imaging (MRI), improves after cardioversion of AF to sinus rhythm (SR). Methods and results All patients undergoing elective cardioversion at our institution were invited to participate. A total of 44 individuals were included. Magnetic resonance imaging studies were done before and after cardioversion with both brain perfusion and cerebral blood flow measurements. However, 17 did not complete the second MRI as they had a recurrence of AF during the observation period (recurrent AF group), leaving 17 in the SR group and 10 in the AF group to complete both measurements. Brain perfusion increased after cardioversion to SR by 4.9 mL/100 g/min in the whole brain (P < 0.001) and by 5.6 mL/100 g/min in grey matter (P < 0.001). Cerebral blood flow increased by 58.6 mL/min (P < 0.05). Both brain perfusion and cerebral blood flow remained unchanged when cardioversion was unsuccessful. Conclusion In this study of individuals undergoing elective cardioversion for AF, restoration, and maintenance of SR for at least 10 weeks after was associated with an improvement of brain perfusion and cerebral blood flow measured by both arterial spin labelling and phase contrast MRI. In those individuals where cardioversion was unsuccessful, there was no change in perfusion or blood flow.

Usefulness of Intravascular Doppler Flow Measurements in Cerebral Endovascular Treatment

1996 ◽  
Vol 2 (2) ◽  
pp. 103-110 ◽  
Author(s):  
K. Fukui ◽  
M. Negoro ◽  
I. Takahashi ◽  
K. Fukasaku ◽  
K. Nakabayashi ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Endovascular Treatment ◽  
Transcranial Doppler Sonography ◽  
Resistance Index ◽  
Flow Measurements ◽  
Doppler Flow ◽  
Carotid Stenoses ◽  
Blood Flow Measurements ◽  
Carotid Cavernous Fistulas

Measurement of cerebral blood flow in cerebral endovascular procedures is useful for the assessment of treatment effects. We used transcranial Doppler sonography (TCD) and Doppler guide wires (SmartWire®, Cardiometrics Co.) in intravascular treatment. The cases were 6 brain arteriovenous malformations (AVM), 2 carotid cavernous fistulas (CCF), 2 facial angiomas, and 2 carotid stenoses. Intravascular cerebral blood flow measurements with the SmartWire were performed during the endovascular procedure. TCD was used pre- and post-endovascular treatment, and velocity, pulsatility index (PI) and resistance index (RI) were compared with the SmartWire. For both TCD and SmartWire, blood velocity of the main artery decreased, and PI and RI were improved after embolisation of AVM. In angioplasty cases, post stenotic flow velocity, as measured by SmartWire, was improved, and the flow of MCA measured with TCD was also improved after treatment. The SmartWire is useful to assess cerebral blood flow changes during the neuroendovascular procedure. Combined with repeated follow up with TCD, Doppler flow measurements are useful to assess the effect of endovascular treatment.

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