1) Even constriction of the vascular lumen, without changes in calibre.(2) Alteration of the vascular reflex.(3) Arterio-venous compression.(4) Localized spasms-irregularities of calibre.(5) Peri-arterial sheathing.
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Vogelius et al. (1950) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: