论文部分内容阅读
灌流狗在体左下肺叶,在肺内压力-容积环上分别选择等压和等容两点,比较吸气和呼气支上相等肺泡压或相等肺容积时的肺血管阻力。呼吸周期中肺动脉压的改变主要取决于肺泡血管阻力的变化。呼气期由肺泡表面液体层产生的向肺泡中心的表面张力较吸气期低,使肺泡压能更有效地传递至肺泡血管.估计在中等肺容积时,呼气期较吸气期毛细血管周围压高465～505Pa(3.5～3.8mmHg).
Perfusion dogs in the left lower lobe of the lung, the pressure in the lung - volume ring were selected two isobaric and isovolens, compared inspiratory and expiratory branch of equal alveolar pressure or equal lung volume pulmonary vascular resistance. Pulmonary arterial pressure changes in the respiratory cycle mainly depends on changes in vascular vascular resistance. Expiratory surface of the alveolar fluid layer produced by the alveolar surface tension lower than the inspiratory phase, so that the alveolar pressure can be more effectively transmitted to the alveolar vascular. Estimated in the middle of the lung volume, expiratory phase compared with inspiratory capillary Around the pressure of 465 ~ 505Pa (3.5 ~ 3.8mmHg).