J Clin Monit Comput - Noninvasive assessment of peripheral microcirculation by near-infrared spectroscopy: a comparative study in healthy smoking and nonsmoking volunteers.

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Resumo

Smokers are exposed to early endothelial dysfunction. This microcirculatory damage can be demonstrated by near-infrared spectroscopy (NIRS). The aim of this study was to compare microvascular reactivity by NIRS during a dynamic vascular occlusion test in healthy smokers and nonsmokers volunteers. Twenty healthy volunteers (10 men, 10 women), aged from 22 to 38?years old, were included after approval of the local Ethics Committee and divided into two groups: smokers (n?=?10) and nonsmokers (n?=?10). Tissue oxygen saturation (StO2) was measured at the level of each individual's calves during an ischemia and reperfusion test. In addition, during the ischemia phase, the slope of decline in StO2 was determined. Therefore, for each group, we were able to deduce the speed of desaturation (StO2/ischemia time). The same was applied for resaturation rates during the reperfusion phase (StO2/reperfusion time). StO2 values were comparable at all experimental steps between smokers and nonsmokers. During the vascular occlusion test, rates of desaturation were the same between smokers and nonsmokers [respectively 3.7?%?min(-1) (range 2.5-12.6) and 3.7?%?min(-1) (range 1.8-15.1); p?=?0.50]. It was the same for the rate of resaturation [smokers 30.4?%?min(-1) (range 14.2-51.6) and nonsmokers 30.5?%?min(-1) (range 18.6-44.5); p?=?0.82]. NIRS study of microvascular reactivity during a dynamic vascular occlusion test did not reveal any difference between smokers and nonsmokers. Therefore, NIRS could not be sensitive enough to highlight endothelial dysfunction in healthy subjects exposed to tobacco smoke.

Resumo Limpo

smoker expos earli endotheli dysfunct microcirculatori damag can demonstr nearinfrar spectroscopi nir aim studi compar microvascular reactiv nir dynam vascular occlus test healthi smoker nonsmok volunt twenti healthi volunt men women age year old includ approv local ethic committe divid two group smoker n nonsmok n tissu oxygen satur sto measur level individu calv ischemia reperfus test addit ischemia phase slope declin sto determin therefor group abl deduc speed desatur stoischemia time appli resatur rate reperfus phase storeperfus time sto valu compar experiment step smoker nonsmok vascular occlus test rate desatur smoker nonsmok respect min rang min rang p rate resatur smoker min rang nonsmok min rang p nir studi microvascular reactiv dynam vascular occlus test reveal differ smoker nonsmok therefor nir sensit enough highlight endotheli dysfunct healthi subject expos tobacco smoke

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