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Comparison of 3 Methods to Induce Acute Pulmonary Hypertension in Pigs

机译:三种诱导猪急性肺动脉高压的方法的比较

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Large animal models for acute pulmonary hypertension (PHT) show distinct differences between species and underlying mechanisms. Two embolic procedures and continuous infusion of a stable thromboxane A2 analogue (U46619) were explored for their abilityto induce PHT and their effects on right ventricular function and pulmonary and systemic circulation in 9 pigs. Injection of small (100 to 200 um) or large (355 to 425 um) polystyrene beads and incremental dosage (0.2 to 0.8 mu g kg~(-1) min~(-1)) of U46619 all induced PHT. However, infusion of U46619 resulted in stable PHT, whereas that after bead injection demonstrated a gradual continuous decline in pressure. This instability was most pronounced with small beads, due to right ventricular failure andconsecutive circulatory collapse. Furthermore, cardiac output decreased during U46619 infusion but increased after embolization with no relevant differences in systemic pressure. This result was likely due to the more pronounced effect of U46619 on pulmonary resistance and impedance in combination with limited effects on pulmonary gas exchange. Coronary autoregulation and adaption of contractility to afterload increase was not impaired by U46619. All parameters returned to baseline values after infusion was discontinued. Continuous infusion of a thromboxane A2 analogue is an excellent method for induction of stable, acute PHT in large animal hemodynamic studies.
机译:急性肺动脉高压(PHT)的大型动物模型显示出物种和潜在机制之间的明显差异。探讨了两种栓塞程序和连续输注稳定的血栓烷A2类似物(U46619)的能力,以诱导9头猪的PHT及其对右心室功能以及肺和全身循环的影响。注射小(100至200 um)或大(355至425 um)聚苯乙烯珠粒和增加剂量(0.2至0.8μg kg〜(-1)min〜(-1))的U46619均可诱发PHT。但是,输注U46619会产生稳定的PHT,而在珠子注射后显示压力逐渐持续下降。由于右心室衰竭和连续性循环衰竭,这种不稳定现象在小珠子中最为明显。此外,在输注U46619期间心输出量下降,但在栓塞后心输出量增加,而系统压力无相关差异。此结果可能是由于U46619对肺部阻力和阻抗的影响更为明显,而对肺部气体交换的影响有限。 U46619并未损害冠状动脉自动调节和收缩力对后负荷的适应。输液后所有参数均恢复至基线值。在大型动物血液动力学研究中,连续输注血栓烷A2类似物是诱导稳定,急性PHT的极好方法。

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