Abstract
The control of human forearm cutaneous vascular resistance was examined using a combination of laser Doppler perfusion measurement and continuous Finapres blood pressure measurement. Tests which provoke changes in blood flow via different control mechanisms (local and neural) were applied in a group of ten healthy subjects. The purpose was to select from them a suitable (i.e. statistically significant) group to apply in cases where a disease process is suspected of interfering with the control of the skin circulation. Deep inspiration, immersion of the feet in water at 15°C (both eliciting sympathetic vasoconstrictor nerve activity) and arm dependency (eliciting the local veni-arteriolar response) produced statistically significant, symmetrical increases in cutaneous vascular resistance in both arms (p < 0.05, Wilcoxon's test for paired differences). Similarly, post-ischaemic reactive hyperaemia (mediated by local vasodilator mechanisms) and indirect heating of the body (eliciting increased sympathetic vasodilator nerve activity) resulted in significant decreases in cutaneous vascular resistance (p < 0.01). When deep inspiration was repeated from a vasodilated baseline after indirect heating, the increases in cutaneous vascular resistance were smaller than those obtained before heating. Isometric handgrip exercise failed to produce a significant change in contralateral cutaneous vascular resistance (p > 0.05). There were no differences between right and left arms for any test (p > 0.05). The successful tests were subjected to power analysis in order to predict likely patient sample sizes required to demonstrate altered responsiveness at sites of microcirculatory disturbance compared with normal skin.
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Stanton, A.W.B., Levick, J.R. & Mortimer, P.S. Assessment of noninvasive tests of cutaneous vascular control in the forearm using a laser Doppler meter and a Finapres blood pressure monitor. Clinical Autonomic Research 5, 37–47 (1995). https://doi.org/10.1007/BF01845497
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DOI: https://doi.org/10.1007/BF01845497