Investigating the association between human brainstem microstructural integrity and hypertension using magnetic...

Area of Science:

• Neuroscience
• Cardiovascular Science
• Medical Imaging

Background:

• The brainstem is crucial for blood pressure regulation.
• Neural pathway disruptions in the brainstem are associated with hypertension.
• The link between subtle brainstem microstructural changes and blood pressure status is not well understood.

Purpose of the Study:

• To investigate the association between brainstem microstructure, myelination, and hypertensive status.
• To explore potential biomarkers for hypertension within the brainstem.

Main Methods:

• Cross-sectional study of 116 cognitively unimpaired adults (aged 22-94 years).
• Utilized advanced MRI techniques: relaxometry (R1, R2) and myelin water fraction (MWF) analysis.
• Assessed microstructural integrity and myelin content in ten brainstem subregions.

Main Results:

• Significant associations found between higher microstructural damage/lower myelin content and hypertensive status.
• Lower R1, R2, or MWF values indicated poorer tissue integrity and myelin content.
• The midbrain tegmentum showed particular vulnerability.
• Combined MRI metrics achieved high classification accuracy (AUC > 0.85).

Conclusions:

• Disrupted brainstem tissue integrity and myelin content may be linked to elevated blood pressure.
• MRI-based assessment of brainstem microstructure shows promise for identifying hypertension-related changes.
• Further longitudinal studies are warranted to confirm these findings and explore causality.