Characterisation and validation of a new murine model of global ischaemia-reperfusion injury

A specially designed Langendorff apparatus was constructed to allow perfusion of the isolated mouse heart. Hearts were randomised into groups to receive differing periods of global (zero flow) ischaemia or continuous perfusion (controls). During reperfusion, recovery of baseline force was recorded and perfusate collected for LDH assay (U/L/g wet weight). After 30 min reperfusion, hearts were stained with tetrazolium and planimetry performed to measure infarct size. Dose-response relationships were demonstrated for all 3 end-points against duration of ischaemic insult. Functional recovery and enzyme leakage correlated well with infarct size (r = 0.77, p < 0.001 and r = 0.73, p < 0.001 respectively). Transgenic mice may now be used to study the effect of specific phenotypic changes on the pathogenesis of ischaemia-reperfusion injury using a reliable and reproducible technique.