The Ontogeny of Cerebrovascular Critical Closing Pressure.

The Ontogeny of Cerebrovascular Critical Closing Pressure.
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脑血管临界闭合压的个体发生。

DOI:
10.1007/978-3-319-22533-3_50
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发表时间:
2016
期刊:
Acta neurochirurgica. Supplement
影响因子:
--
通讯作者:
Kaiser,JeffreyR
Kaiser,JeffreyR
中科院分区:
--
文献类型:
--
作者:
Rhee,ChristopherJ;Fraser3rd,CharlesD;Kibler,Kathleen;Easley,RonaldB;Andropoulos,DeanB;Czosnyka,Marek;Varsos,GeorgiosV;Smielewski,Peter;Rusin,CraigG;Brady,KenM;Kaiser,JeffreyR

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早产儿有血管神经损伤的危险。低血压和高血压被认为是有害的,但这两种疾病的定义都没有达成共识。临界闭合压(CrCP)是脑血流停止时的动脉血压(ABP)。CrCP可用于定义受试者特定的低或高ABP。我们的目标是量化CrCP作为胎龄(GA)的函数。186例早产儿,GA范围为23-33周,在出生后第一周内用脐动脉导管和经颅多普勒超声仪监测大脑中动脉血流速度(FV)1小时。使用阻抗模型推导和基于多普勒的脑血管阻力和顺应性估计计算CrCP。CrCP随GA显著增加(r= 0.47;斜率= 1.4 mmHg/妊娠周),多变量分析持续相关(p< 0.001)。较高的舒张期ABP和较高的GA与CrCP增加相关(两者p<0.001)。CrCP在第二个三个月结束和第三个三个月开始时显著增加。在早产儿中观察到的低CrCP可以解释他们耐受低ABP而不发生全脑梗死或出血的能力。
Premature infants are at risk of vascular neurological insults. Hypotension and hypertension are considered injurious, but neither condition is defined with consensus. Critical closing pressure (CrCP) is the arterial blood pressure (ABP) at which cerebral blood flow ceases. CrCP may serve to define subject-specific low or high ABP. Our objective was to quantify CrCP as a function of gestational age (GA). One hundred eighty-six premature infants with a GA range of 23–33 weeks, were monitored with umbilical artery catheters and transcranial Doppler insonation of middle cerebral artery flow velocity (FV) for 1-h sessions over the first week of life. CrCP was calculated using an impedance model derivation with Doppler-based estimations of cerebrovascular resistance and compliance. CrCP increased significantly with GA (r= 0.47; slope = 1.4 mmHg/week gestation), an association that persisted with multivariate analysis (p< 0.001). Higher diastolic ABP and higher GA were associated with increased CrCP (p<0.001 for both). CrCP increases significantly at the end of the second and beginning of the third trimester. The low CrCP observed in premature infants may explain their ability to tolerate low ABP without global cerebral infarct or hemorrhage.
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