Ruptured brain aneurysms show a distinctive multi-system signature in angiography, inflammation and metabolism

Ruptured intracranial aneurysms differ from unruptured ones not only in a single imaging measure but across three biological domains at once, according to a cross-sectional study published in BMC Neurology. The researchers combined quantitative digital subtraction angiography (QDSA), circulating inflammatory markers and untargeted serum metabolomics in the same patients to characterize what they call a multi-system phenotype associated with aneurysm rupture.

The study was a single-center retrospective analysis of 100 patients, each with a single saccular intracranial aneurysm. Fifty patients had unruptured intracranial aneurysms (UIAs) and fifty had ruptured intracranial aneurysms (RIAs). For every participant, the team measured aneurysm-specific QDSA parameters, serum levels of the inflammatory markers IL-6, MMP-9 and sTWEAK, and an untargeted serum metabolomic profile, then constructed domain-specific scores and combined them into an equal-weight multi-system score.

On the imaging side, ruptured aneurysms were associated with higher aneurysm-specific full width at half maximum, mean transit time and stasis, together with lower washout. The authors describe this pattern as a QDSA contrast retention–washout phenotype: in ruptured aneurysms, the contrast agent lingered longer and cleared less efficiently, pointing to altered intra-aneurysmal flow dynamics.

The adjusted standardized differences between the ruptured and unruptured groups were substantial in each domain. The QDSA score showed a difference of 1.634 (95% CI, 1.127–2.140), the inflammatory score 0.980 (95% CI, 0.391–1.569), and the nine-metabolite score 1.592 (95% CI, 1.187–1.996). The equal-weight multi-system score showed the largest adjusted group difference, with a beta of 1.956 (95% CI, 1.551–2.361).

The study also examined how the domains relate to one another. The relationship between inflammation and metabolism differed between the unruptured and ruptured states, with an adjusted interaction beta of −0.606 (95% CI, −0.996 to −0.217; P = 0.002). This suggests that the cross-system organization linking inflammatory activity and serum metabolites is not fixed but varies with rupture status.

To test the robustness of these findings, the researchers adjusted their primary analyses for age, sex, bifurcation status and anterior versus posterior circulation. They then assessed stability using overlap weighting, geometry-related sensitivity analyses and strict cross-fitting. The main associations remained stable across all of these approaches.

The authors conclude that ruptured aneurysm status was associated with prolonged contrast retention and impaired washout on QDSA, together with concurrent differences in circulating inflammatory markers and endogenous serum metabolites. Integrating the three domains, they report, characterized a broader multi-system pattern and differences in cross-system organization between the established UIA and RIA states.

Several caveats are important. Because the study is retrospective and cross-sectional, it compares established unruptured and ruptured states in different patients; it cannot show whether the hemodynamic, inflammatory or metabolic differences cause rupture or result from it. The findings come from a single center with 50 patients per group, and the article is an early-release version subject to further edits before the final Version of Record. The multi-system score describes an association with rupture status and is not presented as a predictive or diagnostic tool.

Within those limits, the work offers a detailed integrated portrait of how local flow behavior, systemic inflammation and serum metabolism co-vary with aneurysm rupture, and it provides a template for studying cerebrovascular disease across multiple biological systems simultaneously rather than in isolation.

Subject of Research: Hemodynamic, inflammatory and metabolic differences associated with ruptured intracranial aneurysms

Article Title: Integrated angiographic hemodynamics, serum inflammatory factors, and untargeted metabolomics characterize a rupture-associated multi-system phenotype in intracranial aneurysms: a cross-sectional study

Article References: Bi, S., Jiang, J., Gui, S., Cheng, C., Zheng, L., Liu, Q., Li, Y., & Kong, D. (2026). Integrated angiographic hemodynamics, serum inflammatory factors, and untargeted metabolomics characterize a rupture-associated multi-system phenotype in intracranial aneurysms: a cross-sectional study. BMC Neurology. https://doi.org/10.1186/s12883-026-05565-2

Image Credits: AI Generated

DOI: 10.1186/s12883-026-05565-2

Keywords: intracranial aneurysm, aneurysm rupture, QDSA, hemodynamics, inflammation, metabolomics, IL-6, MMP-9, sTWEAK, cross-sectional study, BMC Neurology, cerebrovascular disease