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

Decrease in left ventricular contractility after tumor necrosis factor-alpha infusion in dogs.

Whether systolic contractility or diastolic compliance changes soon after tumor necrosis factor-alpha ( TNF-alpha) exposure is not known. Accordingly, we measured hemodynamics, left ventricular contractility using the slope of the end-systolic pressure-volume relationship, and diastolic pressure-volume relationships in six control dogs and in six dogs receiving 60 micrograms.kg-1.h-1 i.v. of TNF-alpha. Mean aortic pressure decreased by 22% 1 h after TNF-alpha infusion and remained decreased (P < 0.05). Cardiac output increased by 19% 1 h after TNF-alpha infusion and remained significantly greater than control values (P < 0.05). Left ventricular contractility decreased by 23% (P < 0.05) 1 h after TNF-alpha infusion and decreased by 52% (P < 0.01) 5 h after TNF-alpha infusion. The diastolic pressure-volume relationship did not change in the TNF-alpha group or the control group. Ejection fraction did not change after TNF-alpha infusion despite the decrease in contractility because afterload decreased. We conclude that TNF-alpha is important in causing the hypotensive, hyperdynamic circulation of sepsis. The new finding that left ventricular contractility is decreased shortly after TNF-alpha infusion suggests that TNF-alpha, or another mediator released very soon after TNF-alpha, is an important myocardial depressant factor.[1]

References

  1. Decrease in left ventricular contractility after tumor necrosis factor-alpha infusion in dogs. Walley, K.R., Hebert, P.C., Wakai, Y., Wilcox, P.G., Road, J.D., Cooper, D.J. J. Appl. Physiol. (1994) [Pubmed]
 
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