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Other Techniques for the Assessment of Small Artery Damage in Hypertension

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Assessment of Preclinical Organ Damage in Hypertension

Abstract

The evaluation of minimum vascular resistance in the forearm with a plethysmographic technique is one of the earliest methods employed for the assessment of the microcirculation. Maximum post-ischemic flow is indeed correlated with the ratio between wall thickness and internal lumen in resistance arterioles. For such an evaluation, it is therefore mandatory that the vascular district investigated is at a real maximum vasodilatation. In humans, this may be obtained by a combination of ischemia, muscular effort and, possibly, heat. From the maximum post-ischemic blood flow it is possible to calculate minimum vascular resistance, which represents an indirect index of microvascular structural alterations, with the additional advantage of an in vivo evaluation. Recently a further, interesting and promising approach was proposed. The method is based on the association between a confocal measurement of th e external diameter of retinal arteriole, and an evaluation of the internal diameter with a laser Doppler technique. The comparison between the two images, defined as “reflection image” and “perfusion image” is made by a dedicated software. From these two measurements, it is relatively easy to calculate the ratio between wall thickness and internal lumen. In summary, new, non invasive techniques for the evaluation of microvascular morphology and for for cardiovascular risk stratification in hypertensive patients are presently under development. They may represent a promising and interesting future perspective.

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Correspondence to Damiano Rizzoni .

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Rizzoni, D., Rosei, C.A. (2015). Other Techniques for the Assessment of Small Artery Damage in Hypertension. In: Agabiti Rosei, E., Mancia, G. (eds) Assessment of Preclinical Organ Damage in Hypertension. Springer, Cham. https://doi.org/10.1007/978-3-319-15603-3_13

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  • DOI: https://doi.org/10.1007/978-3-319-15603-3_13

  • Publisher Name: Springer, Cham

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