Blood Flow Changes Between Migraine Attacks

Posted on May 02 2025, By: Cerebral Torque

Increased Cerebral Hemodynamics During the Interictal Period of Migraine

New research reveals significant blood flow changes between migraine attacks and their association with migraine features

Based on research published in Clinical Radiology | March 2025

Overview

Migraine is a chronic neurological disorder ranked as the second leading cause of global disability-adjusted life years among women aged 15-49 years. This groundbreaking study employed advanced 4D flow MRI technology to investigate cerebral hemodynamic changes in migraine patients during the interictal period (between migraine attacks), revealing important connections between blood flow patterns and migraine features.

Quick Summary of Findings
Migraine patients have significantly increased cerebral blood flow parameters even between attacks
The study examined both middle cerebral artery (MCA) and posterior cerebral artery (PCA) blood flow
Blood flow changes were observed in both arteries but showed different patterns
The average flow rate in the PCA correlates with the duration of migraine history
These findings provide new insights into the relationship between migraine and cerebrovascular changes

Study Design

The researchers used advanced 4D flow MRI to comprehensively examine blood flow patterns in the brains of migraine patients between attacks, comparing them to healthy matched controls.

What is 4D Flow MRI?

4D flow MRI, also known as time-resolved 3D phase-contrast MRI with three-directional velocity encodings, is an advanced imaging technique that provides three-dimensional visualization of blood flow throughout the entire cardiac cycle. It allows quantification of various hemodynamic parameters, such as velocity, flow rate, and wall shear stress, in any chosen blood vessel within the imaging area.

Migraine Patients

25 patients (average age 29, 88% female) with migraine during the interictal period participated in the study.

Healthy Controls

25 age and sex-matched healthy individuals (average age 28, 80% female) without migraine history served as controls.

MRI Strength

All MRI scans were performed on a 3 Tesla MR scanner with a 32-channel head coil for high-resolution imaging.

Key Findings: Middle Cerebral Artery

The research team found significant differences in blood flow parameters of the middle cerebral artery (MCA) between migraine patients and healthy controls. These findings persisted even after adjusting for mean blood pressure and heart rate.

22%

Higher PSV

Peak systolic velocity in the MCA was approximately 22% higher in migraine patients compared to controls (98.84 vs 81.00 cm/s).

10%

Higher Average Velocity

Average through-plane velocity (Vavg) in the MCA was about 10% higher in migraine patients (34.94 vs 31.72 cm/s).

20%

Higher Flow Rate

Average blood flow rate (Flowavg) in the MCA was approximately 20% higher in migraine patients (3.82 vs 3.19 ml/s).

"Increased PSV, Vavg and Flowavg in the MCA were found among migraine patients. The between-group differences in hemodynamic parameters remained statistically significant after adjusting for potential confounding factors."

Key Findings: Posterior Cerebral Artery

Interesting differences were also observed in the posterior cerebral artery (PCA), which supplies blood to the occipital lobe and parts of the temporal and parietal lobes.

17%

Higher Average Velocity

Average through-plane velocity (Vavg) in the PCA was about 17% higher in migraine patients (26.44 vs 22.55 cm/s).

18%

Higher Flow Rate

Average blood flow rate (Flowavg) in the PCA was approximately 18% higher in migraine patients (1.91 vs 1.62 ml/s).

18%

Higher Wall Shear Stress

Average wall shear stress (WSSavg) in the PCA was about 18% higher in migraine patients (0.99 vs 0.84 Pa).

What is Wall Shear Stress?

Wall shear stress (WSS) is the tangential force exerted by blood flow on the endothelial cells lining the vascular walls. It is directly proportional to the velocity gradient at the vessel wall. Disturbed WSS can act as a significant local stimulus contributing to platelet aggregation, thrombus formation, and vascular remodeling, independent of systemic factors.

Connection to Migraine Duration

One of the most significant findings of this study was the relationship between blood flow patterns and the duration of a patient's migraine history.

Correlation Analysis

PCA Flow Rate & Migraine Duration Strong Correlation (r=0.46)

Statistical Significance p=0.02

Effect of Insomnia & Depression No Mediating Effect

"A significantly positive correlation was identified between the Flowavg of the PCA and the duration of migraine history. This suggests a direct effect of the chronic course of migraine on the Flowavg of PCA."

Interestingly, no correlations were found between Flowavg of the PCA and other migraine features, including attack-free days, frequency, and severity of pain. Similarly, no significant differences in cerebral hemodynamics were observed between patients with and without prophylactic or acute medication use.

Implications for Understanding Migraine

The research offers valuable insights into the relationship between migraine and cerebrovascular function, with potential implications for treatment and management:

Key Implications

Persistent Vascular Changes: Blood flow alterations persist even between migraine attacks, suggesting ongoing vascular adaptations

Progressive Nature: The correlation with migraine duration suggests these changes may worsen over time

Posterior Circulation Focus: The significant findings in the PCA align with previous research showing posterior circulation vulnerability in migraine sufferers

Endothelial Dysfunction: Increased wall shear stress in the PCA may indicate underlying endothelial problems in migraine patients

Stroke Risk Connection: The findings may help explain the established link between migraine and increased risk of cerebrovascular diseases

"The increased WSSavg observed in the PCA of migraineurs in our study is noteworthy as it corresponds to areas typically vulnerable to ischemic stroke in migraine sufferers, implying a possible underlying endothelial dysfunction."

Research Limitations

The authors acknowledge several limitations that should be considered when interpreting the results:

Study Limitations

Sample Size Small (25 per group)

Multiple Comparisons No Statistical Correction

Migraine Phase Interictal Only

Migraine With Aura Limited Cases (only 2)

Despite these limitations, the study represents a significant advancement in understanding the cerebrovascular aspects of migraine and provides a foundation for future research with larger and more diverse patient populations.

Based on: Liu Y, Sun A, Zhang Y, Wang B, Kuang X, Dai F, Wang H, Ding J, Wang X. (2025). Increased cerebral hemodynamics during the interictal period of migraine and the association with migraine features. Clinical Radiology, 85(2025):106918. DOI: 10.1016/j.crad.2025.106918

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