Observational study finds widened arteries associated with increased lacunar stroke risk — Evidence Review

A new study suggests that lacunar stroke is more closely linked to damage and widening of the brain’s small blood vessels than to fatty plaque in large arteries. Most prior research has hinted at small vessel involvement rather than large artery disease, and the new findings from the University of Edinburgh reinforce this evolving view.

• Several earlier studies report that lacunar stroke risk is not strongly associated with large-artery atherosclerosis or typical atherothrombotic risk factors, but rather with small vessel pathology, such as hypertension and white matter changes, aligning with the new findings 2 3 9.
• Meta-analyses and cohort studies have found lower prevalence of atrial fibrillation and carotid stenosis in lacunar versus nonlacunar stroke, suggesting a different underlying mechanism for lacunar strokes—specifically, nonatherosclerotic small vessel disease 2.
• Some studies have noted associations between lacunar stroke and traditional risk factors like hypertension and hyperlipidemia, but this does not contradict the new study’s focus on microvascular changes as the primary driver, as these risk factors may promote small vessel injury rather than large artery plaque 3 4 8.

Study Overview and Key Findings

Lacunar strokes account for a significant proportion of all ischemic strokes and are a major cause of long-term disability and cognitive decline. Despite their prevalence, the causes and best prevention strategies for lacunar stroke have remained uncertain, in part because the underlying pathology was thought to be similar to that of other ischemic strokes—namely, atherosclerosis of large arteries. This new study challenges that assumption by providing imaging evidence that widened and elongated small arteries in the brain, rather than fatty narrowing of large arteries, are more strongly associated with lacunar stroke and its progression. This shift in understanding is particularly relevant given the limited effectiveness of standard antiplatelet therapies for lacunar stroke, highlighting the need for new treatment approaches targeting small vessel health.

Property	Value
Study Year	2026
Organization	University of Edinburgh, UK Dementia Research Institute
Journal Name	Circulation
Authors	Fei Han, Una Clancy, Carmen Arteaga-Reyes, Michael J. Thrippleton, Maria del C. Valdés Hernández, Daniela Jaime Garcia, Michael S. Stringer, Ellen Backhouse, Francesca M. Chappell, Yajun Cheng, Dillys Xiaodi Liu, Junfang Zhang, Angela C.C. Jochems, Eleni Sakka, Charlotte Jardine, Gayle Barclay, Donna McIntyre, Iona Hamilton, Rosalind Brown, Yi-Cheng Zhu, Fergus N. Doubal, Joanna M. Wardlaw
Population	People with lacunar stroke or mild non-lacunar stroke
Sample Size	229 participants
Methods	Observational Study
Outcome	Association between arterial features and lacunar stroke
Results	Widened arteries linked to over 4x higher lacunar stroke risk.

Literature Review: Related Studies

To place these new findings in context, we searched the Consensus research database, which indexes over 200 million scholarly papers. The following search queries were used to identify relevant research:

1. lacunar stroke widened arteries risk
2. stroke risk factors arterial health
3. vascular changes lacunar stroke outcomes

Below, we summarize related studies by major topic:

Topic	Key Findings
What is the primary vascular pathology underlying lacunar stroke?	- Lacunar stroke is less associated with large artery atherosclerosis and more with small vessel disease, including microvascular changes such as leukoaraiosis and vessel wall pathology 2 3 14. - Meta-analyses show lower prevalence of cardioembolic sources and carotid stenosis in lacunar versus nonlacunar strokes, supporting a distinct small vessel arteriopathy 2.
Which risk factors are most strongly associated with lacunar stroke?	- Hypertension and diabetes are commonly linked to lacunar stroke, but not always more than in other stroke types; some studies report only a marginal excess of hypertension in lacunar versus nonlacunar stroke 1 3 8. - White matter leukoaraiosis is more associated with lacunar stroke, while high LDL-cholesterol and carotid stenosis are more associated with large artery strokes 3 9.
How do vascular changes influence outcomes and recurrence in lacunar stroke?	- Multiple lacunar infarcts and greater white matter changes predict higher risk of recurrence and worse functional outcomes 11 13. - Elevated inflammatory markers (e.g., IL-6, TNF receptor) are associated with increased risk of recurrent vascular events in lacunar stroke patients 12.
Are conventional stroke prevention strategies effective for lacunar stroke?	- Standard antiplatelet therapies (e.g., aspirin) are less effective at preventing recurrence in lacunar stroke, possibly due to the distinct microvascular pathology 12. - Intravenous alteplase (thrombolysis) shows similar outcomes for lacunar and nonlacunar strokes, but overall, there is a need for therapies targeting small vessel disease processes 15 14.

What is the primary vascular pathology underlying lacunar stroke?

Related studies consistently indicate that lacunar strokes are primarily caused by small vessel disease rather than large artery atherosclerosis. This aligns with the new study's demonstration that widened and elongated small arteries—not large artery narrowing—are associated with lacunar events. Pathological and imaging studies have long suggested that microvascular changes, including vessel wall thickening, leukoaraiosis, and segmental arteriolar disorganization (lipohyalinosis), are central to lacunar stroke pathogenesis 2 3 14.

• Lacunar strokes are distinct from other ischemic stroke subtypes in both risk profiles and underlying arterial pathology 2.
• Large artery atherosclerosis and cardioembolism are less frequently implicated in lacunar strokes compared to nonlacunar strokes 2.
• Imaging and autopsy studies have shown characteristic small vessel changes, such as vessel wall thickening and lipohyalinosis, in patients with lacunar infarcts 14.
• The new study's focus on arterial widening in the brain is consistent with the concept of small vessel disease as a primary driver, expanding on the traditional view of microvascular changes 14.

Which risk factors are most strongly associated with lacunar stroke?

Risk factor analysis across studies reveals that hypertension and diabetes are common in both lacunar and nonlacunar strokes, but may not be uniquely elevated in lacunar stroke. Instead, features like white matter leukoaraiosis, indicative of small vessel damage, are more closely tied to lacunar stroke. Cholesterol-related risk factors and carotid stenosis are more prominent in large artery strokes, reinforcing the distinction in underlying etiology 1 3 9.

• Systematic reviews show only a marginal excess of hypertension in lacunar stroke versus nonlacunar stroke, with similar rates of diabetes 1.
• White matter changes and leukoaraiosis are more prevalent in lacunar than large artery strokes 3.
• High LDL-cholesterol and carotid stenosis are less strongly associated with lacunar stroke, but more so with large artery atherosclerosis 3 9.
• The new study’s finding—that widened small arteries, rather than large artery narrowing, are linked to lacunar stroke—fits with the observed pattern of risk factors in prior research 2 3.

How do vascular changes influence outcomes and recurrence in lacunar stroke?

Studies have demonstrated that the extent of small vessel disease, such as the presence of multiple lacunar infarcts or white matter changes, predicts worse outcomes and higher recurrence rates. Additionally, inflammatory markers have been linked to increased risk of recurrent vascular events after lacunar stroke, potentially impacting the effectiveness of secondary prevention strategies 11 12 13.

• Patients with multiple lacunar infarcts, diabetes, or prominent leukoaraiosis have higher risk of recurrence and poorer functional recovery 11 13.
• High levels of inflammatory markers (e.g., IL-6, TNF receptor) are associated with greater risk of vascular events after lacunar stroke 12.
• The new study’s observation that widened small arteries predict silent strokes and progression of brain damage is consistent with the literature on small vessel disease burden and outcomes 13.
• These findings highlight the need for improved risk stratification and tailored therapies for this population 12 13.

Are conventional stroke prevention strategies effective for lacunar stroke?

Evidence suggests that standard antiplatelet therapies, which are effective in other stroke subtypes, do not provide the same benefit in preventing recurrence after lacunar stroke. This may be due to the distinct underlying microvascular pathology. While thrombolytic therapy (alteplase) appears similarly effective in lacunar and nonlacunar strokes for acute treatment, more targeted approaches are needed for long-term prevention 12 14 15.

• Antiplatelet drugs are less effective in lacunar stroke, possibly because they do not address the primary small vessel pathology 12.
• The efficacy of intravenous thrombolysis is comparable between lacunar and nonlacunar strokes, but this does not translate to long-term prevention 15.
• The new study’s rationale for focusing future therapies on small vessel disease processes is supported by prior literature 14.
• There is a recognized need for new treatment strategies that directly target microvascular damage in lacunar stroke 14.

Future Research Questions

Although the new findings significantly advance our understanding of lacunar stroke pathophysiology, further research is needed to clarify causal mechanisms, identify optimal prevention strategies, and develop effective therapies targeting small vessel disease. There are persistent gaps in knowledge regarding the progression of microvascular changes, the interplay of traditional risk factors, and the most promising therapeutic interventions.

Research Question	Relevance
How do arterial widening and elongation develop over time in patients at risk of lacunar stroke?	Understanding the temporal progression of these vascular changes could inform early detection and prevention strategies, as small vessel disease often precedes clinical events 14 13.
What are the molecular and cellular mechanisms underlying arterial widening in cerebral small vessel disease?	Identifying the biological processes driving arterial changes could lead to novel therapeutic targets and more personalized interventions for lacunar stroke prevention 14 3.
Can therapies targeting small vessel health reduce the risk of lacunar stroke recurrence?	The limited effectiveness of antiplatelet drugs highlights the need to test whether medications or interventions focused on microvascular repair can prevent recurrent lacunar strokes 12 14.
How do traditional vascular risk factors (e.g. hypertension, diabetes) influence the development of arterial widening and lacunar stroke?	Clarifying the interactions between established risk factors and microvascular changes may help refine prevention strategies and risk stratification 1 3 9.
Are there genetic or environmental factors that predispose individuals to cerebral arterial widening and lacunar stroke?	Uncovering genetic or environmental determinants could enable targeted screening and preventive measures for high-risk populations, as suggested in recent reviews 14 13.