本文作者用人类心血管系统(CVS)的一个数学模型研究了不同呼吸方法对循环系统的影响,用该模型模拟了正常CVS及心脏与胸内压之间的相互作用关系。用阻力、容量及惯量元素代表血管系统,同时以透壁压力为基础,根据时间变化的弹回性概念,心室作功。该模型表明,正常的吸气效应引起静脉回流增加,肺血流增加及左心室搏出量(LVSV)略微减少,表明由于LV透壁压的增加,射出量减少。胸膜压减少到-40mmHg,代表了Muller法(MM),着重强调了上述发现,尽管LV舒张期末容积(LVEDV)、LV收缩期末容积(LVESV)及表示平均左心房透壁压的LV充盈压增加,但LVSV减少。用增加的呼气末正压(PE— The authors used a mathematical model of the human cardiovascular system (CVS) to study the effects of different respiratory approaches on the circulatory system and used this model to simulate the relationship between normal CVS and cardiac and intrathoracic pressures. With resistance, volume and inertia elements on behalf of the vascular system, at the same time based on transmural pressure, according to the concept of time-varying springback, ventricular work. This model shows that normal inspiration results in increased venous return, increased pulmonary blood flow, and a slight decrease in left ventricular stroke volume (LVSV), indicating a reduction in the amount of shot due to an increase in LV transmural pressure. The pleural pressure was reduced to -40 mmHg, representing the Muller’s method (MM), highlighting the above findings despite an increase in LV end-diastolic volume (LVEDV), LV end-systolic volume (LVESV) and LV filling pressure indicative of mean left atrial transmural pressure , But LVSV decreased. With an increased positive end expiratory pressure (PE-