Abstract
Objectives
To use multi-parametric magnetic resonance imaging (MRI) to test the hypothesis that hypertensives would have higher retrograde venous blood flow (RVBF) in the internal jugular veins (IJV) vs. normotensives, and that this would inversely correlate with arterial inflow and gray matter, white matter, and cerebrospinal fluid volumes.
Methods
Following local institutional review board approval and written consent, a prospective observational 3-T MRI study of 42 hypertensive patients (53 ± 2 years, BMI 28.2 ± 0.6 kg/m2, ambulatory daytime systolic BP 148 ± 2 mmHg, ambulatory daytime diastolic BP 101 ± 2 mmHg) and 35 normotensive patients (48 ± 2 years, BMI 25.2 ± 0.8 kg/m2, ambulatory daytime systolic BP 119 ± 3 mmHg, ambulatory daytime diastolic BP 90 ± 2 mmHg) was performed. Phase contrast imaging calculated percentage retrograde venous blood flow (%RVBF), brain segmentation estimated regional brain volumes from 3D T1-weighted images, and pseudo-continuous arterial spin labeling measured regional cerebral blood perfusion. Statistical analysis included two-sample equal variance Student’s T tests, two-way analysis of variance with Tukey’s post hoc correction, and permutation-based two-group general linear modeling (p < 0.05).
Results
In the left IJV, %RVBF was higher in hypertensives (6.1 ± 1.5%) vs. normotensives (1.1 ± 0.3%, p = 0.003). In hypertensives, there was an inverse relationship of %RVBF (permutation-based general linear modeling) to cerebral blood flow in several brain regions, including the left occipital pole and the cerebellar vermis (p < 0.01). Percentage retrograde flow in the left IJV correlated inversely with the total matter volume (gray plus white matter volume) in hypertensives (r = − 0.49, p = 0.004).
Conclusion
RVBF in the left IJV is greater in hypertensives vs. normotensives and is linked to regional hypoperfusion and brain total matter volume.
Key Points
• Hypertensive humans have higher retrograde cerebral venous blood flow, associated with regional brain hypoperfusion and lower tissue volume, compared with controls.
• Cerebral retrograde venous blood flow may add further stress to already hypoperfused tissue in hypertensive patients.
• The amount of retrograde venous blood flow in hypertensive patients may predict which patients might be at higher risk of developing cerebral pathologies.
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Abbreviations
- BP:
-
Blood pressure
- CSA:
-
Cross-sectional area
- CSF:
-
Cerebrospinal fluid
- IJV:
-
Internal jugular vein
- MRI:
-
Magnetic resonance imaging
- PCASL:
-
Pseudo-continuous arterial spin labeling
- ROI:
-
Region of interest
- RVBF:
-
Retrograde venous blood flow
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Acknowledgments
The authors would like to thank Peter Hobden, Martin Stuart, and John Evans for their help in designing MR paradigms and acquiring the MR images. We would also like to thank the research nurses Rissa Calsena and Jenny Wilcox for their help in recruiting and screening the participants. Finally, we would like to thank the volunteers for participating in this study.
Funding
The study was funded by the British Heart Foundation (IBSRF FS/11/1/28400; ECH).
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The scientific guarantor of this publication is Dr. Emma Hart.
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Written informed consent was obtained from all subjects (patients) in this study.
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Rodrigues, J.C.L., Strelko, G., Warnert, E.A.H. et al. Retrograde blood flow in the internal jugular veins of humans with hypertension may have implications for cerebral arterial blood flow. Eur Radiol 30, 3890–3899 (2020). https://doi.org/10.1007/s00330-020-06752-6
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DOI: https://doi.org/10.1007/s00330-020-06752-6