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자료유형
학술저널
저자정보
Kim, Cuk-Seong (School of Mechanical Engineering, Chungnam University) Kim, Hyo-Shin (School of Mechanical Engineering, Chungnam University) Lee, Young-Jun (School of Mechanical Engineering, Chungnam University) Park, Jin Bory (School of Mechanical Engineering, Chungnam University) Ryoo, Sung-Woo (Department of Clinical Pathology, Chungnam University) Chang, Seok-Jang (School of Mechanical Engineering, Chungnam University) Jeon, Byeong-Hwa
저널정보
순환기의공학회 International Journal of Vascular Biomedical Engineering International Journal of Vascular Biomedical Engineering 제1권 제2호
발행연도
2003.1
수록면
13 - 19 (7page)

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Endothelial release of nitric oxide (NO) contributes to the regulation of vascular tone by inducing vascular relaxation. To estimate the blood flow-dependent nitric oxide level and half-life (T1/2) of nitric oxide in vivo state, we investigated the change of aortic NO currents during the change of aortic blood flow rate using NO-selective electrode system and electromagnetic flowmeter in the aorta of anesthetized rats. Resting mean aortic blood flow rate was $49.6{\pm}5.6ml/min$ in the anesthetized rats. NO currents in the aorta were increased by the elevation of blood pressure and/or blood flow rate. When the aortic blood flow was occluded by the clamping, aortic NO currents were decreased. The difference of NO concentration between resting state and occluded state was $1.34{\pm}0.26{\mu}M$ (n=7). This NO concentration was estimated as blood flow-dependent nitric oxide concentration in the rats. Also, while the aortic blood flow was occluded, NO currents were decreased with exponential pattern with $12.84{\pm}2.15$ seconds of time constant and $7.70{\pm}1.07$ seconds of half-life. To summarize, this study suggested that blood flow-dependent NO concentration and half-life of nitric oxide were about $1.3{\mu}M$ and 7.7 seconds, respectively, in the aorta of anesthetized rats. The nitric oxide-selective electrode system is useful for the direct and continuous measurement of NO in vivo state.

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