越稠越好：表面活性剂黏度如何主导肺部表面活性剂的均匀递送
Thicker Is Better: How Surfactant Viscosity Governs Uniform Surfactant Lung Delivery
浏览论文内容
中文总结 AI 辅助
本研究通过三维生物力学模型和约2400万次模拟，发现提高表面活性剂黏度十倍至三十倍可显著改善肺部药物递送均匀性，为成人ARDS治疗提供新策略。
中文摘要 AI 辅助
表面活性剂替代疗法（SRT）是治疗新生儿呼吸窘迫综合征的成熟干预手段，然而将其应用于患有急性呼吸窘迫综合征（ARDS）的成人时，临床试验结果却不一致。我们利用一个三维、零维生物力学模型，模拟表面活性剂团注通过肺气道树的传输过程，证明：尽管肺的树状分支结构会产生离散的流动区域，导致药物递送在空间上不均匀且效率低下，但表面活性剂的黏度是决定递送均匀性的关键因素——低于解析推导出的临界黏度时，重力会导致表面活性剂完全无法进入整个肺亚区，且与剂量体积无关。将黏度在当前制剂基础上提高十倍至三十倍（这在临床上可行），可使所有分叉处的分流比趋近于理想的均分值0.5，从而在婴儿和成人肺模型中实现对终末细支气管近乎完全且空间均匀的覆盖。对约2400万次模拟的主成分分析证实，在所有注射参数中，黏度对递送均匀性具有最强的正向影响，而剂量体积是效率的主要决定因素。这些发现为通过提高外源性表面活性剂黏度来改善成人SRT疗效提供了机制层面的理论依据。
英文摘要
Surfactant Replacement Therapy (SRT) is a well-established intervention for Neonatal Respiratory Distress Syndrome, yet its translation to adults with Acute Respiratory Distress Syndrome (ARDS) has yielded inconsistent results in clinical trials. Using a three-dimensional, zero-dimensional biomechanical model of surfactant bolus transport through the pulmonary airway tree, we demonstrate that, while the tree-like branching architecture of the lung gives rise to discrete flow regimes that result in spatially heterogeneous and inefficient drug delivery, surfactant viscosity is a key determinant of delivery homogeneity: below an analytically derived critical viscosity, gravity causes complete surfactant exclusion from entire lung subregions regardless of dose volume. A clinically compatible tenfold to thirtyfold increase in viscosity above current formulations drives all bifurcation splitting factors toward the ideal even-split value of 0.5, enabling near-complete and spatially uniform coverage of terminal bronchioles in both infant and adult lung models. Principal component analysis across approximately 24 million simulations confirms that viscosity exerts the strongest positive influence on delivery homogeneity among all injection parameters, with dose volume being the primary determinant of efficiency. These findings provide a mechanistic rationale for reformulating exogenous surfactants with higher viscosity to improve SRT outcomes in adults.
