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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Influence of splenectomy on hemodynamics during cardiac tamponade.

The effect of prior splenectomy on the hemodynamics of cardiac tamponade was investigated in 15 closed-chest pentobarbital sodium-anesthetized dogs. Hemodynamics were compared at baseline and during staged cardiac tamponade (pericardial pressures of 5, 10, and 15 mmHg) at control (n = 15) and after splenectomy (n = 8) and sham operation (n = 7). The fall in mean arterial pressure with cardiac tamponade was significantly greater in splenectomized dogs than in either sham-operated or control dogs (P less than 0.001). Cardiac output was more depressed at the third level of cardiac tamponade in splenectomized than in sham-operated or control dogs (12.8 +/- 14.5 vs. 29.3 +/- 8.7 and 25.4 +/- 9.4, respectively; both P less than 0.05 vs. splenectomy). Hemodynamic failure, defined as an inability to maintain mean arterial pressure greater than 50 mmHg for 5 min, occurred at a lower pericardial pressure in splenectomized than in sham-operated dogs (13.1 +/- 3.8 vs. 18.1 +/- 3.5 mmHg, P less than 0.05). Hematocrit increased significantly with cardiac tamponade in controls and sham-operated but not splenectomized dogs. The percent increase in hematocrit from baseline to the third stage of cardiac tamponade was 19.6 +/- 9.8 and 22.3 +/- 5.6% in control and sham dogs, respectively. Thus the canine spleen plays an important role in cardiovascular compensation to cardiac tamponade. Parallel changes in hematocrit suggest that a part of this response is due to splenic autotransfusion.[1]


  1. Influence of splenectomy on hemodynamics during cardiac tamponade. Hoit, B.D., Gabel, M., Fowler, N.O. Am. J. Physiol. (1991) [Pubmed]
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