PMID: 3745065Aug 1, 1986Paper

Effect of heart weight on distribution of lung surface pressures in vertical dogs

Journal of Applied Physiology
E Bar-YishayJ R Rodarte

Abstract

In head-up dogs the vertical gradient of transpulmonary pressure (VGTP) disappears after pneumothorax develops. Our laboratory recently confirmed that the heart moves downward and posteriorly with pneumothorax. To study the extent to which the heart is supported by the lungs, we used a linear elasticity model and finite-element analysis. The lung and heart were assumed to be symmetric along a vertical axis. Reported values of the elastic properties of lung and heart were assigned. The model was generated first without the heart, using the lung alone. The heart was then added to the model. Finally, heart weight was doubled. Adding the heart caused the VGTP to increase; doubling the heart weight further increased the VGTP. These increases were more pronounced at higher lung volumes. Lung inflation was accompanied by an upward displacement of the heart. Inclusion of the heart caused increased inhomogeneities in regional volume distribution. The effect of heart weight may in part explain why the VGTP in the head-up dog is greater than that predicted by lung density.

Citations

Jun 19, 2002·American Journal of Respiratory and Critical Care Medicine·Rolf D Hubmayr
Mar 12, 2011·Journal of Applied Physiology·Gaetano PerchiazziGöran Hedenstierna
Apr 15, 2018·European Journal of Applied Physiology·Benedikt SchlagerHans-Joachim Wilke
May 12, 2000·American Journal of Respiratory and Critical Care Medicine·R K Albert, R D Hubmayr
Jan 1, 1991·The American Review of Respiratory Disease·M PinskyJ M De Smet
Jul 3, 1999·American Journal of Respiratory and Critical Care Medicine·M A MartynowiczR D Hubmayr
Jul 25, 2000·Journal of Applied Physiology·S J Lai-Fook, R E Hyatt
May 6, 2006·American Journal of Respiratory and Critical Care Medicine·Shinya TsuchidaBrian P Kavanagh
Jun 9, 2010·Expert Review of Respiratory Medicine·Maria Plataki, Rolf D Hubmayr
Mar 27, 2004·Physiological Reviews·Stephen J Lai-Fook
Feb 8, 2005·American Journal of Respiratory and Critical Care Medicine·Nicholas E Vlahakis, Rolf D Hubmayr
Jul 19, 2002·Chest Surgery Clinics of North America·Steven A Conrad, Akhil Bidani

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