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Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats
Published on: August 1, 2018
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Quantitative Phase-Contrast MR Angiography to Measure Hemodynamic Changes in Idiopathic Intracranial Hypertension
J Juhász1, T Lindner2, C Riedel2
1From the Clinic for Radiology and Neuroradiology (J.J., T.L., C.R., O.J., A.R.) julia.juhasz@uksh.de.
AJNR. American Journal of Neuroradiology
|March 10, 2018
Summary
Idiopathic intracranial hypertension affects venous blood flow, not arterial. Lumbar puncture reveals hemodynamic changes in venous sinuses, offering insights into this condition.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Idiopathic intracranial hypertension (IIH) is characterized by elevated intracranial pressure (ICP) of unknown cause.
- Limited MR imaging studies exist on arterial and venous blood flow in IIH patients.
- Previous research on IIH hemodynamics before and after cerebrospinal fluid (CSF) pressure reduction is lacking.
Purpose of the Study:
- To evaluate the immediate impact of normalizing ICP on intracranial blood flow in IIH patients.
- To investigate the pathophysiology of IIH by analyzing hemodynamic alterations.
- To compare hemodynamic parameters in IIH patients with healthy controls.
Main Methods:
- Quantitative MR imaging-derived flow measurements were used for brain-supplying arteries and draining veins/dural sinuses.
- Hemodynamic changes were assessed in IIH patients before and after lumbar puncture (CSF pressure reduction).
- A healthy control group was included for comparison.
Main Results:
- Differences in resistance and pulsatility indices were observed in the superior sagittal sinus post-lumbar puncture.
- Venous pulsatility negatively correlated with CSF pressure in untreated IIH patients.
- Internal jugular vein flow significantly decreased after lumbar puncture; arterial flow remained unaffected.
Conclusions:
- Venous blood flow, unlike arterial, is altered in IIH patients compared to controls.
- Resistance and pulsatility indices may aid in assessing short-term hemodynamic changes in IIH post-CSF diversion.
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