Reply to the letter "Understanding lactate and its clearance during extracorporeal membrane oxygenation for supporting refractory cardiogenic shock patients".

This is a reply to the letter titled "Understanding lactate and its clearance during extracorporeal membrane oxygenation for supporting refractory cardiogenic shock patients" by Eva Rully Kurniawati et al. In response to the concerns raised about our paper published in BMC Cardiovascular Disorders, titled "Association between serum lactate levels and mortality in patients with cardiogenic shock receiving mechanical circulatory support: a multicenter retrospective cohort study," we have addressed the confounding bias on the population included and the use of VA-ECMO and Impella CP. Furthermore, we have provided new data on the correlation of oxygen supply and lactate levels at admission of cardiogenic shock.