Acute heart failure 2 Arterial stiffness 2 Intra-aortic balloon pump 2 Ovis aries 2 animal experiment 2 animal model 2 article 2 counterpulsation 2 elasticity 2 in vivo study 2 nonhuman 2 priority journal 2 Adventitia 1 Animals 1 Aorta 1 Blood Flow Velocity 1 Blood Pressure 1 Endothelium 1 Endothelium, Vascular 1 Heart Failure 1 Hemodynamics 1 Intra-Aortic Balloon Pumping 1 Sheep 1 acute heart failure 1 animal cell 1 animal tissue 1 aorta balloon 1 arterial pressure 1 arterial stiffness 1 artery compliance 1