Our results demonstrated that cells immediately after H/R injury and after 5 hrs of reoxygenation had significantly lower cell viability (MTT test). Furthermore, we established that the addition of OEC‐CM to the H/R injured cultures significantly improved cell viability compared to untreated cells. Otherwise cells cultured in presence of OEC‐CM for 24 hrs in normoxic conditions did not show any significant difference compared to control (Fig. 2A).