Arterial widening emerges as key driver of small vessel stroke

 How will this change your competent? doctors' protocols on treating stroke? Oh, nothing will happen because there are NO protocols, since your doctor is guessing every step of the way, Hope the guesses are correct because your doctor gets paid regardless!

Arterial widening emerges as key driver of small vessel stroke

A prospective study of 229 patients with lacunar or mild non-lacunar stroke found that large-artery stenosis was not associated with cerebral small-vessel disease (cSVD) or incident infarcts, whereas arterial widening and basilar artery dolichoectasia were strongly linked to lacunar stroke, higher cSVD burden, and progression of brain lesions over 1 year.

The findings, published in Circulation, challenge traditional atherosclerotic paradigms and suggest that intrinsic microvascular pathology plays a central role in cSVD, underscoring the need for mechanism-specific diagnostic and therapeutic strategies in stroke care.

“This study provides strong evidence that lacunar stroke is not caused by fatty blockage of larger arteries, but by disease of the small vessels within the brain itself,” said Joanna Wardlaw, University of Edinburgh’s Institute for Neuroscience and Cardiovascular Disease, Edinburgh, United Kingdom. “Recognising this distinction is crucial, because it explains why conventional treatments like antiplatelet drugs are not as effective for this type of stroke and highlights the urgent need to develop new therapies that target the underlying microvascular damage.”

For the study, the researchers followed 229 patients (mean age, 65.9 years; 57% with lacunar stroke) with serial clinical and MRI assessments over 1 year to evaluate the impact of large-artery stenosis and arterial widening on stroke subtype and cSVD. Large-artery stenosis (≥50%) was present in 20.5% of patients and basilar artery dolichoectasia in 15.7%, with multivariable analyses adjusting for demographic and vascular risk factors.

Results showed that large-artery stenosis was not associated with cSVD markers or incident infarcts and was instead linked to lower odds of lacunar versus non-lacunar stroke (odds ratio [OR] = 0.49), whereas basilar artery dolichoectasia was strongly associated with lacunar stroke (OR = 4.67), higher small-vessel disease burden (OR = 2.57), increased risk of incident infarcts (OR = 2.29; 75% subcortical), and greater progression of white matter hyperintensities over 1 year (β 0.15 per log10 volume increase).

The researchers said that future treatments should target the underlying small vessel damage. Trials such as LACI-3 are now testing whether existing drugs, including cilostazol and isosorbide mononitrate, can protect the brain, reduce further strokes, and help prevent problems with memory, mobility, and dementia after lacunar stroke.

Reference: https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.126.079493

SOURCE: University of Edinburgh