KINETICS OF GAS EXCHANGE IN THE PULMONARY CIRCULATION

描述（改编自申请人摘要）：肺气体速率 交易受许多因素的影响，但有两个主要过程， 似乎限制O2和CO2交换的动力学的是 毛细血管通过时间和毛细血管内反应率 呼吸气体 因此，申请人建议研究变更 在肺血管系统不同节段的通过时间中 以及肺的完整循环中的气体交换率。 的 气体交换的动力学将在分离的灌注肺中确定 体积描记器中包含的制剂。 肺部会被灌注 通过液压泵进行缓冲，该液压泵还从 体积描记器以相同的速率记录，以防止任何净体积变化。 A 2.0 ml 将反应物的团注入灌注系统。 后续 气体交换产生压力瞬变，该压力瞬变与 相应体积的交换气体。 在知道了 推注曲线，观察到的惰性气体交换 溶解在推注中，以及注射后的氧气交换速率 一团连二亚硫酸钠，申请人将确定 通过时间在动脉和毛细血管段的分布 肺循环 注射红细胞悬浮液将 表示毛细血管气体交换的速率。

DESCRIPTION (adapted from applicant's abstract): The rate of pulmonary gas exchange is affected by many factors but the two principal processes which appear to limit the kinetics of 02 and C02 exchange are the duration of capillary transit time and the rates of intracapillary reactions of the respiratory gases. Therefore the applicant proposes to study the variation in transit times throughout different segments of the pulmonary vasculature and the rate of gas exchange in the intact circulation of the lung. The kinetics of gas exchange would be determined in an isolated, perfused lung preparation contained within a plethysmograph. The lungs would be perfused with buffer by a hydraulic pump which also removes water from the plethysmograph at the same rate to prevent any net volume change. A 2.0 ml bolus of reactant would be injected into the perfusion system. Subsequent gas exchange produces a pressure transient which is related to the corresponding volume of exchanged gas. With knowledge of the concentration profile of a bolus injection, the observed exchange of an inert gas dissolved in a bolus, and the rate of oxygen exchange following injection of a bolus of sodium dithionite, the applicant would determine the distribution of transit times in the arterial and capillary segments of the pulmonary circulation. Injection of suspensions of erythrocytes would indicate the rate of capillary gas exchange.