TY - JOUR
T1 - Interrelationships among noninvasive measures of postischemic macro- and microvascular reactivity
AU - Dhindsa, Mandeep
AU - Sommerlad, Shawn M.
AU - DeVan, Allison E.
AU - Barnes, Jill N.
AU - Sugawara, Jun
AU - Ley, Obdulia
AU - Tanaka, Hirofumi
PY - 2008/8
Y1 - 2008/8
N2 - The clinical importance of vascular reactivity as an early marker of atherosclerosis has been well established, and a number of established and emerging techniques have been employed to provide measurements of peripheral vascular reactivity. However, relations between these methodologies are unclear as each technique evaluates different physiological aspects related to micro- and macrovascular reactive hyperemia. To address this question, a total of 40 apparently healthy normotensive adults, 19-68 yr old, underwent 5 min of forearm suprasystolic cuff-induced ischemia followed by postischemic measurements. Measurements of vascular reactivity included 1) flow-mediated dilatation (FMD), 2) changes in pulse wave velocity between the brachial and radial artery (ΔPWV), 3) hyperemic shear stress, 4) reactive hyperemic flow, 5) reactive hyperemia index (RHI) assessed by fingertip arterial tonometry, 6) fingertip temperature rebound (TR), and 7) skin reactive hyperemia. FMD was significantly and positively associated with RHI (r = 0.47) and TR (r = 0.45) (both P < 0.01) but not with reactive hyperemic flow or hyperemic shear stress. There was no correlation between two measures of macrovascular reactivity (FMD and ΔPWV). Skin reactive hyperemia was significantly associated with RHI (r = 0.55) and reactive hyperemic flow (r = 0.35) (both P < 0.05). There was a significant association between reactive hyperemia and RHI (r = 0.30; P < 0.05). In more than 75% of cases, vascular reactivity measures were not significantly associated. We concluded that associations among different measures of peripheral micro- and macrovascular reactivity were modest at best. These results suggest that different physiological mechanisms may be involved in changing different measures of vascular reactivity.
AB - The clinical importance of vascular reactivity as an early marker of atherosclerosis has been well established, and a number of established and emerging techniques have been employed to provide measurements of peripheral vascular reactivity. However, relations between these methodologies are unclear as each technique evaluates different physiological aspects related to micro- and macrovascular reactive hyperemia. To address this question, a total of 40 apparently healthy normotensive adults, 19-68 yr old, underwent 5 min of forearm suprasystolic cuff-induced ischemia followed by postischemic measurements. Measurements of vascular reactivity included 1) flow-mediated dilatation (FMD), 2) changes in pulse wave velocity between the brachial and radial artery (ΔPWV), 3) hyperemic shear stress, 4) reactive hyperemic flow, 5) reactive hyperemia index (RHI) assessed by fingertip arterial tonometry, 6) fingertip temperature rebound (TR), and 7) skin reactive hyperemia. FMD was significantly and positively associated with RHI (r = 0.47) and TR (r = 0.45) (both P < 0.01) but not with reactive hyperemic flow or hyperemic shear stress. There was no correlation between two measures of macrovascular reactivity (FMD and ΔPWV). Skin reactive hyperemia was significantly associated with RHI (r = 0.55) and reactive hyperemic flow (r = 0.35) (both P < 0.05). There was a significant association between reactive hyperemia and RHI (r = 0.30; P < 0.05). In more than 75% of cases, vascular reactivity measures were not significantly associated. We concluded that associations among different measures of peripheral micro- and macrovascular reactivity were modest at best. These results suggest that different physiological mechanisms may be involved in changing different measures of vascular reactivity.
KW - Endothelial function
KW - Flow-mediated dilatation
KW - Pulse wave velocity
KW - Reactive hyperemia
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U2 - 10.1152/japplphysiol.90431.2008
DO - 10.1152/japplphysiol.90431.2008
M3 - Article
C2 - 18483158
AN - SCOPUS:53449098645
SN - 8750-7587
VL - 105
SP - 427
EP - 432
JO - Journal of applied physiology
JF - Journal of applied physiology
IS - 2
ER -