Why the study?
Does manipulating coronary flow or antagonizing adenosine receptors affect postischemic recovery of left ventricular developed pressure in septic rat hearts?
Does manipulating coronary flow or antagonizing adenosine receptors affect postischemic recovery of left ventricular developed pressure in septic rat hearts?
Endogenous adenosine, rather than elevated coronary flow, appears to mediate the protection against ischemia-reperfusion injury observed in septic rat hearts.
Adenosine antagonism impairs postischemic recovery in septic rat hearts; leaves open whether endogenous adenosine protects human sepsis patients.
Sepsis depresses myocardial function but prevents subsequent ischemia-reperfusion injury. Elevated coronary flow (CF) and endogenous adenosine may be important factors in the complete recovery of postischemic myocardial function observed in septic rat hearts. The purpose of this study was to determine the effects of manipulating CF and of antagonizing adenosine receptors on the postischemic recovery of left ventricular developed pressure (LVDP) in septic and control rat hearts. The relationship between CF and LVDP in septic rat hearts before ischemia was depressed compared with control. However, this relationship was unaltered by ischemia in septic hearts, whereas in control hearts it was severely depressed. Preventing the elevation of CF during reperfusion did not significantly affect the recovery of LVDP in septic rat hearts. Adenosine antagonism by 8-phenyltheophylline (0.1 and 1 nM) prevented the elevated CF during reperfusion, and the higher dose significantly depressed postischemic function. We conclude that elevated CF did not contribute to the recovery of postischemic LVDP in septic rat hearts but that endogenous adenosine may provide protection from ischemia.
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Ismail et al. (1998) studied this question.
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