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We read with interest the article by Simonato et al on the distribution of symptomatic cerebral vasospasm following subarachnoid hemorrhage assessed using cone beam CT angiography.1 The authors assessed cerebral arterial diameters with cone beam CT angiography in a cohort of 30 patients who underwent percutaneous balloon angioplasty for cerebral vasospasm and concluded that symptomatic cerebral vasospasm after aneurysmal subarachnoid hemorrhage does not involve arteries smaller than 900 µm and frequently predominate in middle or distal segments.
The authors hypothesized that small arteries have a reduced vasoconstriction ability due to their thinner muscular wall. However, this speculation is not in line with several studies assessing the myogenic response of cerebral vessels.2–6 All of these studies defined the myogenic vasoconstriction or vasodilatation of brain …
Contributors FD conceived and wrote the letter. DGR and SP helped with the final editing and approval.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial, or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.
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