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首页> 外文期刊>Journal of Biomedical Science and Engineering >Pattern of respiratory-induced changes in fingertip blood volume measured by light transmission
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Pattern of respiratory-induced changes in fingertip blood volume measured by light transmission

机译：通过光透射法测量的呼吸诱导的指尖血容量变化模式

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Respiratory-induced fluctuations in heart rate and arterial blood pressure have been intensively investigated, but there is little information on the effect of respiration on peripheral blood volume. In the current study, blood volume changes in the finger, obtained by light transmission measurements, were measured during regular breathing (6 s periods) and long breathing (12 s periods). Respiratory chest-circumference changes were simultaneously measured in order to associate the pattern of tissue blood volume change with the respiratory cycle. Sixteen subjects were studied, and in fourteen finger blood vol ume increased during inspiration and decreased during expiration in the long-breathing periods. In all 14 subjects the start of blood volume decrease was significantly delayed from the start of expiration by mean ± SD 1.00 ± 0.65 s (p < 0.001, range 0 - 2.3 s). The start of blood volume increase was significantly delayed from the end of expiration by 3.45 ± 1.76 s (p < 0.005). In eight, finger blood volume started to increase more than 2 s before the start of inspiration. For the 6 s breathing period, blood volume decreased during inspiration in five examinations, and increased in seven. The increase in peripheral blood volume during inspiration could be attributed to the higher abdominal pressure during inspiration, and to the decrease in sympathetic activity during inspiration and the subsequent vasodilatation. The decrease in peripheral blood volume during inspiration is probably due to the negative thoracic pressure during inspiration and its mechanical effect on thoracic vessels.
机译：呼吸引起的心率和动脉血压波动已得到深入研究，但关于呼吸对外周血容量影响的信息很少。在当前研究中，通过光透射测量获得的手指的血容量变化是在正常呼吸（6 s周期）和长时间呼吸（12 s周期）期间测量的。同时测量呼吸胸围的变化，以使组织血容量变化的模式与呼吸周期相关联。研究了16名受试者，在长期呼吸期间，十四个手指的血液量在吸气过程中增加而在呼气过程中减少。在所有14位受试者中，血流量的开始从呼气开始开始明显延迟了平均值±SD 1.00±0.65 s（p <0.001，范围0-2.3 s）。从呼气末开始，血容量的增加开始显着延迟了3.45±1.76 s（p <0.005）。在八分之一时间内，在开始吸气之前，手指血液量开始增加超过2 s。在6 s的呼吸期间，吸气过程中五次检查的血量减少，七次检查的血量增加。吸气过程中外周血容量的增加可能归因于吸气过程中较高的腹压，以及吸气过程中的交感活动减少以及随后的血管舒张。吸气过程中外周血容量的减少可能是由于吸气过程中胸腔负压及其对胸腔血管的机械作用。

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