AJP - Heart and Circulatory Physiology, Vol 258, Issue 4 1079-H1086, Copyright © 1990 by American Physiological Society

ARTICLES

External pressure of undisturbed left ventricle

R. J. Applegate, W. P. Santamore, H. S. Klopfenstein and W. C. Little
Department of Medicine, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, North Carolina 27103.

We evaluated the contribution of the thorax and the undisturbed pericardium to the external pressure of the euvolemic left ventricle in thirteen anesthetized dogs. Left ventricular (LV) end-diastolic pressure (EDP) in the euvolemic state was 7 +/- 2 mmHg initially and increased to 10 +/- 2 mmHg after the chest and pericardium were opened. LV end-diastolic volume (conductance catheter) was 43 +/- 20 ml initially and did not change after the chest or the pericardium was opened. Intrathoracic (PIT) and pericardial (PPER) pressures were calculated as the difference in LV chamber pressure before and after opening these spaces. Thus for the LV, PIT was -3 +/- 1 mmHg, and PPER was 0 +/- 2 mmHg. Isovolumic relaxation, early diastolic filling, and total diastolic filling were not significantly altered after the chest or pericardium was opened. Thus under euvolemic conditions in this model pericardial pressure is negligible, and the external pressure of the undisturbed left ventricle is negative and equal to intrathoracic pressure.

This article has been cited by other articles:

				G. deVries, D. R. Hamilton, H. E. D. J. Ter Keurs, R. Beyar, and J. V. Tyberg A novel technique for measurement of pericardial pressure Am J Physiol Heart Circ Physiol, June 1, 2001; 280(6): H2815 - H2822. [Abstract] [Full Text] [PDF]

				D. R. Hamilton, G. Devries, and J. V. Tyberg Static and dynamic operating characteristics of a pericardial balloon J Appl Physiol, April 1, 2001; 90(4): 1481 - 1488. [Abstract] [Full Text] [PDF]