Key result
Anthrax lethal toxin impairs LV systolic function, whereas edema toxin reduces preload without direct myocardial injury.
Why the study?
Fatalities due to anthrax are associated with severe hypotension suggesting that the toxins lethal toxin and edema toxin have cardiovascular effects that need characterization.
Do lethal and edema toxins of anthrax induce distinct hemodynamic dysfunction?
Do lethal and edema toxins of anthrax induce distinct hemodynamic dysfunction?
Lethal and edema toxins from Bacillus anthracis exert distinct mechanisms of hemodynamic dysfunction, with LeTx causing myocardial systolic dysfunction and EdTx reducing preload.
May inform toxin-specific shock models; hypothesis-generating for anthrax hemodynamics pending clinical validation.
Fatalities due to anthrax are associated with severe hypotension suggesting that the toxins generated from Bacillus anthracis, lethal toxin (LeTx) and edema toxin (EdTx), have cardiovascular effects. Here, we demonstrate the effects of these toxins and characterize their effects by echocardiography. LeTx leads to a significant reduction in ejection fraction, decreased velocity of propagation (diastolic dysfunction), decreased velocity of circumferential fiber shortening (decreased contractility), and increased LV systolic area (pathophysiology). EdTx leads to a significant reduction in left ventricular volumes and cardiac output (reduced stroke volume) but does not cause significant change in ejection fraction or contractility. These results indicate that LeTx reduces left ventricular systolic function and EdTx reduces preload but does not have direct myocardial effects. Together, these findings suggest that LeTx and EdTx exert distinct hemodynamic dysfunction associated with anthrax infection.
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E. Watson Linley (2007) studied Anthrax infection. Lethal toxin (LeTx) and edema toxin (EdTx) was evaluated on Hemodynamic function (ejection fraction, left ventricular volumes, cardiac output). Lethal toxin reduces left ventricular systolic function, whereas edema toxin reduces preload without direct myocardial effects, demonstrating distinct hemodynamic dysfunctions.
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