Global and regional brain mean diffusivity changes in patients with heart failure

Area of Science:

• Neurology
• Cardiology
• Medical Imaging

Background:

• Heart failure (HF) is associated with brain alterations in areas regulating autonomic and motor functions.
• Distinguishing between acute and chronic tissue pathology in HF is crucial for understanding disease progression.

Purpose of the Study:

• To investigate chronic brain tissue changes in heart failure patients using diffusion tensor imaging (DTI).
• To differentiate between acute and chronic pathological processes in the brain of HF patients.

Main Methods:

• Collected DTI data from 16 HF patients and 26 controls using a 3.0-Tesla MRI scanner.
• Analyzed mean diffusivity (MD) maps, comparing global and regional values in autonomic and motor control areas.
• Employed analysis of covariance, adjusting for age and gender, to compare MD values between groups.

Main Results:

• Significantly higher global brain MD values were observed in HF patients compared to controls (P=0.038).
• Elevated regional MD values were found in key areas including the insula, hypothalamus, and cerebellar regions in HF patients (P<0.001).
• Whole-brain analysis revealed increased MD in limbic, basal-ganglia, thalamic, and frontal regions of HF subjects.

Conclusions:

• Heart failure is associated with chronic brain tissue changes, indicated by elevated mean diffusivity.
• These widespread brain alterations in autonomic and motor control areas may underlie functional impairments in HF patients.
• DTI-based MD analysis can help identify and characterize chronic neuropathology in heart failure.