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- W2000796869 abstract "Background— l -Arginine is the precursor of endothelium-derived nitric oxide, an endogenous vasodilator. l -Arginine supplementation improves vascular reactivity and functional capacity in peripheral arterial disease (PAD) in small, short-term studies. We aimed to determine the effects of long-term administration of l -arginine on vascular reactivity and functional capacity in patients with PAD. Methods and Results— The Nitric Oxide in Peripheral Arterial Insufficiency (NO-PAIN) study was a randomized clinical trial of oral l -arginine (3 g/d) versus placebo for 6 months in 133 subjects with intermittent claudication due to PAD in a single-center setting. The primary end point was the change at 6 months in the absolute claudication distance as assessed by the Skinner-Gardner treadmill protocol. l -Arginine supplementation significantly increased plasma l -arginine levels. However, measures of nitric oxide availability (including flow-mediated vasodilation, vascular compliance, plasma and urinary nitrogen oxides, and plasma citrulline formation) were reduced or not improved compared with placebo. Although absolute claudication distance improved in both l -arginine- and placebo-treated patients, the improvement in the l -arginine-treated group was significantly less than that in the placebo group (28.3% versus 11.5%; P =0.024). Conclusions— In patients with PAD, long-term administration of l -arginine does not increase nitric oxide synthesis or improve vascular reactivity. Furthermore, the expected placebo effect observed in studies of functional capacity was attenuated in the l -arginine-treated group. As opposed to its short-term administration, long-term administration of l -arginine is not useful in patients with intermittent claudication and PAD." @default.
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- W2000796869 date "2007-07-10" @default.
- W2000796869 modified "2023-10-10" @default.
- W2000796869 title "<scp>l</scp> -Arginine Supplementation in Peripheral Arterial Disease" @default.
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- W2000796869 doi "https://doi.org/10.1161/circulationaha.106.683656" @default.
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