Middle cerebral O₂ delivery during the modified Oxford maneuver increases with sodium nitroprusside and decreases during phenylephrine.

Middle cerebral O₂ delivery during the modified Oxford maneuver increases with sodium nitroprusside and decreases during phenylephrine.
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改良牛津演习期间,中脑 O2 输送量随着硝普钠的增加而增加,而随着去氧肾上腺素的增加而减少。

DOI:
10.1152/ajpheart.00114.2013
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发表时间:
2013
期刊:
American journal of physiology. Heart and circulatory physiology
影响因子:
--
通讯作者:
Schwartz,ChristopherE
Schwartz,ChristopherE
中科院分区:
--
文献类型:
--
作者:
Stewart,JulianM;Medow,MarvinS;DelPozzi,Andrew;Messer,ZacharyR;Terilli,Courtney;Schwartz,ChristopherE

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改良Oxford动作可作为评价动脉压力感受性反射功能的参考标准。该操作包括全身推注100 μg硝普钠(SNP),然后注射150 μg苯丙氨酸(PE)。一方面,这导致氧合血红蛋白和总血红蛋白的增加,随后由近红外光谱(NIRS)照射的脑样品体积内的减少。另一方面,通过经颅多普勒超声测量,SNP期间大脑中动脉(MCA)内的脑血流速度(CBFv)降低,PE期间CBFv增加。为了解决这个明显的差异,我们假设SNP扩张,而PE收缩,MCA。我们结合经颅多普勒超声的右侧大脑中动脉与近红外光谱照射右额叶皮质在12仰卧健康受试者18-24岁。假设氧气消耗量和静脉饱和度恒定(通过部分静脉阻塞体积描记法估计),我们使用质量守恒(连续性)方程来估计NIRS照明区域的动脉流入量(ΔQa)和静脉流出量(ΔQv)的变化。尽管有低血压,但SNP组的氧合血红蛋白和总血红蛋白分别增加13.6 ± 1.6和15.2 ± 1.4 μmol/kg脑组织,尽管有高血压,但PE组的氧合血红蛋白和总血红蛋白分别减少6 ± 1和7 ± 1 μmol/kg脑组织。SNP使ΔQaby增加0.36 ± 0.03 μmol·kg-1·s-1(21.6 μmol·kg-1·min-1),而CBFv从71 ± 2下降到62 ± 2 cm/s。PE使ΔQaby降低0.27 ± .2 μmol·kg-1·s-1(16.2 μmol·kg-1·min-1),而CBFv升高至75 ± 3 cm/s。这些结果与SNP引起的MCA扩张和PE引起的MCA收缩一致。
The modified Oxford maneuver is the reference standard for assessing arterial baroreflex function. The maneuver comprises a systemic bolus injection of 100 μg sodium nitroprusside (SNP) followed by 150 μg phenylephrine (PE). On the one hand, this results in an increase in oxyhemoglobin and total hemoglobin followed by a decrease within the cerebral sample volume illuminated by near-infrared spectroscopy (NIRS). On the other hand, it produces a decrease in cerebral blood flow velocity (CBFv) within the middle cerebral artery (MCA) during SNP and an increase in CBFv during PE as measured by transcranial Doppler ultrasound. To resolve this apparent discrepancy, we hypothesized that SNP dilates, whereas PE constricts, the MCA. We combined transcranial Doppler ultrasound of the right MCA with NIRS illuminating the right frontal cortex in 12 supine healthy subjects 18–24 yr old. Assuming constant O2consumption and venous saturation, as estimated by partial venous occlusion plethysmography, we used conservation of mass (continuity) equations to estimate the changes in arterial inflow (ΔQa) and venous outflow (ΔQv) of the NIRS-illuminated area. Oxyhemoglobin and total hemoglobin, respectively, increased by 13.6 ± 1.6 and 15.2 ± 1.4 μmol/kg brain tissue with SNP despite hypotension and decreased by 6 ± 1 and 7 ± 1 μmol/kg with PE despite hypertension. SNP increased ΔQaby 0.36 ± .03 μmol·kg−1·s−1(21.6 μmol·kg−1·min−1), whereas CBFv decreased from 71 ± 2 to 62 ± 2 cm/s. PE decreased ΔQaby 0.27 ± .2 μmol·kg−1·s−1(16.2 μmol·kg−1·min−1), whereas CBFv increased to 75 ± 3 cm/s. These results are consistent with dilation of the MCA by SNP and constriction by PE.
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