Key result
Reperfusion after 2 hours of coronary occlusion improved contractile function at sites of moderate and severe dysfunction, whereas reperfusion after 4 hours did not significantly restore function.
Why the study?
Does 2 hours compared to 4 hours of temporary coronary occlusion improve the recovery of left ventricular segmental function after long-term reperfusion in conscious dogs?
Does 2 hours compared to 4 hours of temporary coronary occlusion improve the recovery of left ventricular segmental function after long-term reperfusion in conscious dogs?
Reperfusion after 2 hours of coronary occlusion allows for significant recovery of ventricular function, whereas 4 hours of occlusion results in irreversible contractile dysfunction despite reperfusion, independent of infarct size.
Preclinical data on ischemia duration and recovery; leaves open optimal reperfusion windows in human MI.
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Bush et al. (1983) studied Temporary coronary occlusion (n=27). 2 hours of left anterior descending coronary artery occlusion vs. 4 hours of left anterior descending coronary artery occlusion was evaluated on Recovery of left ventricular segmental function (net systolic wall thickening). Reperfusion after 2 hours of coronary occlusion improved contractile function at sites of moderate and severe dysfunction, whereas reperfusion after 4 hours did not significantly restore function.
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