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- W2083465287 abstract "Platelet P 2 Y 12 -ADP and COX-1 receptor inhibition with oral clopidogrel (CLO) and low-dose aspirin (ASA), respectively, attenuates reflex-mediated cutaneous vasodilation, but little is known about how these medications affect local vasodilatory signaling. Reactive hyperemia (RH) results in vasodilation that is mediated by sensory nerves and endothelium-derived hyperpolarization factors (EDHF) through large-conductance calcium-activated potassium channels, whereas slow local heating (LH) elicits vasodilation largely through the production of nitric oxide (NO). We hypothesized that CLO and ASA would attenuate locally mediated cutaneous vasodilation assessed by RH and LH (0.5°C/min). In a randomized, cross-over, double-blind placebo-controlled study, nine healthy men and women (56 ± 1 yr) took CLO (75 mg), ASA (81 mg), and placebo for 7 days. Skin blood flow was measured (laser-Doppler flowmetry, LDF) and cutaneous vascular conductance (CVC) was calculated (LDF/mean arterial pressure) and normalized to maximal CVC (%CVC max : 43°C and 28 mM sodium nitroprusside). RH response parameters, including area under the curve (AUC), total hyperemic response (THR), and the decay constant tau (λ) were calculated. NO-dependent vasodilation during LH was assessed by calculating the difference in %CVC max between a control site and an NO synthase-inhibited site (10 mM l-NAME: intradermal microdialysis). CLO augmented the AUC and THR (AUC clo = 3,783 ± 342; THR clo = 2,306 ± 266% CVC max /s) of the RH response compared with ASA (AUC ASA = 3,101 ± 325; THR ASA = 1,695 ± 197% CVC max /s) and placebo (AUC Placebo = 3,000 ± 283; THR Placebo = 1,675 ± 170% CVC max /s; all P < 0.0001 vs. CLO). There was no difference in the LH response or calculated NO-dependent vasodilation among treatments (all P > 0.05). Oral CLO treatment augments vasodilation during RH but not LH, suggesting that CLO may improve cutaneous microvascular function." @default.
- W2083465287 created "2016-06-24" @default.
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- W2083465287 date "2013-08-15" @default.
- W2083465287 modified "2023-09-26" @default.
- W2083465287 title "Oral clopidogrel improves cutaneous microvascular function through EDHF-dependent mechanisms in middle-aged humans" @default.
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- W2083465287 doi "https://doi.org/10.1152/ajpregu.00366.2012" @default.
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