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Anthrax lethal and edema toxins produce different patterns of cardiovascular and renal dysfunction and synergistically decrease survival in canines.

Anthrax lethal and edema toxins produce different patterns of cardiovascular and renal dysfunction and synergistically decrease survival in canines.

Authors :
Sweeney DA
Cui X
Solomon SB
Vitberg DA
Migone TS
Scher D
Danner RL
Natanson C
Subramanian GM
Eichacker PQ
Source :
The Journal of infectious diseases [J Infect Dis] 2010 Dec 15; Vol. 202 (12), pp. 1885-96. Date of Electronic Publication: 2010 Nov 10.
Publication Year :
2010

Abstract

Background: High mortality in the 2001 US and recent European anthrax outbreaks suggests that better understanding of the effects of the toxins produced by this bacterium is needed to improve treatment.<br />Methods and Results: Here, 24-h edema (ETx) and lethal (LeTx) toxin infusions were investigated for 96 hin sedated canines receiving mechanical ventilation. The initial study compared similarly lethal doses of ETx (n=8) or LeTx (n=15) alone. ETx was 24 times less lethal than LeTx, and the median time to death in nonsurvivors (n=6 and n=9, respectively) was shorter with ETx (42 vs 67 h; P=.04). Compared with controls(n=9), both toxins decreased arterial and central venous pressures and systemic vascular resistance and increased heart rate, cardiac index, blood urea nitrogen (BUN) level, creatinine (Cr) concentration, BUN:Cr ratio, and hepatic transaminase levels (P ≤ .05 for toxin effect or time interaction). However, ETx stimulated early diuresis,reduced serum sodium levels, and had more pronounced vasodilatory effects, compared with LeTx, as reflected by greater or earlier central venous pressures, systemic vascular resistance, and changes in the BUN:Cr ratio(P ≤ .01). LeTx progressively decreased the left ventricular ejection fraction (P ≤ .002). In a subsequent study, a lethal dose of LeTx with an equimolar nonlethal ETx dose (n=8) increased mortality, compared with LeTx alone (n=8; P= .05).<br />Conclusion: Shock with ETx or LeTx may require differing supportive therapies, whereas toxin antagonists should likely target both toxins.

Details

Language :
English
ISSN :
1537-6613
Volume :
202
Issue :
12
Database :
MEDLINE
Journal :
The Journal of infectious diseases
Publication Type :
Academic Journal
Accession number :
21067373
Full Text :
https://doi.org/10.1086/657408