Reflex vascular defects in the orthostatic tachycardia syndrome of adolescents.

Reflex vascular defects in the orthostatic tachycardia syndrome of adolescents.
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青少年直立性心动过速综合征的反射性血管缺陷。

DOI:
10.1152/jappl.2001.90.6.2025
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发表时间:
2001
期刊:
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子:
--
通讯作者:
Weldon,A
Weldon,A
中科院分区:
--
文献类型:
--
作者:
Stewart,JM;Weldon,A

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依赖性汇集发生在与血管收缩缺陷相关的体位性直立性心动过速综合征(POTS)中。静脉压(Pv)升高>20 mmHg发生在一些患者(高Pv),但其他患者(正常Pv)则没有。我们比较了22例患者,年龄12-18岁,与13名正常对照。采用连续血压和应变式体积描记法测量仰卧位前臂和小腿血流、阻力、静脉顺应性和微血管滤过,以及70°头高位时的血流和肿胀。仰卧位,高Pv时手臂(26 ± 2 mmHg · ml-1· 100 ml · min)和腿部(34 ± 3 mmHg · ml-1· 100 ml · min)阻力正常,但腿部血流量较低(1.5 ± 0.4 ml · 100 ml-1· min-1)。仰卧腿Pv(30 ± 2 vs.对照组13 ± 1 mmHg)超过水肿阈值(等容压= 19 ± 3 mmHg)。仰卧位时,正常Pv在手臂(4.1 ± 0.2 vs. 3.5 ± 0.2 ml · 100 ml−1· min− 1)和腿部(3.8 ± 0.4 vs. 2.7 ± 0.3 ml · 100 ml−1· min− 1)的血流量较高,阻力较低。随着倾斜,小腿血流量稳步增加,在POTS与高Pv和短暂增加,在正常Pv。所有POTS患者的小腿体积均增加。在正常Pv下,只有前臂维持在心脏水平时,手臂血流量增加。这些数据表明,存在(至少)两个以高Pv和低流量或正常Pv和高流量为特征的POTS亚组。这些可能分别对应于局部或压力感受器介导的血管收缩异常。
Dependent pooling occurs in postural orthostatic tachycardia syndrome (POTS) related to defective vasoconstriction. Increased venous pressure (Pv) >20 mmHg occurs in some patients (high Pv) but not others (normal Pv). We compared 22 patients, aged 12–18 yr, with 13 normal controls. Continuous blood pressure and strain-gauge plethysmography were used to measure supine forearm and calf blood flow, resistance, venous compliance, and microvascular filtration, and blood flow and swelling during 70° head-up tilt. Supine, high Pv had normal resistance in arms (26 ± 2 mmHg · ml−1· 100 ml · min) and legs (34 ± 3 mmHg · ml−1· 100 ml · min) but low leg blood flow (1.5 ± 0.4 ml · 100 ml−1· min−1). Supine leg Pv (30 ± 2 vs. 13 ± 1 mmHg in control) exceeded the threshold for edema (isovolumetric pressure = 19 ± 3 mmHg). Supine, normal Pv had high blood flow in arms (4.1 ± 0.2 vs. 3.5 ± 0.2 ml · 100 ml−1· min−1in control) and legs (3.8 ± 0.4 vs. 2.7 ± 0.3 ml · 100 ml−1· min−1in control) with low resistance. With tilt, calf blood flow increased steadily in POTS with high Pv and transiently increased in normal Pv. Calf volume increased in all POTS patients. Arm blood flow increased in normal Pv only with forearm maintained at heart level. These data suggest that there are (at least) two subgroups of POTS characterized by high Pv and low flow or normal Pv and high flow. These may correspond to abnormalities in local or baroreceptor-mediated vasoconstriction, respectively.
通过累积小静脉压力阶跃和不同倾斜度来评估微血管液体过滤能力(Kf)。
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DOI: --
发表时间: 1997
期刊: Journal of Physiology
影响因子: --
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游离皮瓣中的静脉-小动脉反射。
DOI: --
发表时间: 1989
期刊: Clinical Physiology
影响因子: --
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DOI: 10.1172/jci114878
发表时间: 1990
期刊: The Journal of clinical investigation
影响因子: --
作者:
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