Current Practices in Acute Blood Purification Therapy in Japan and Topics for Further Study

Continuous venovenous hemodiafiltration is the modality of choice for acute blood purification therapy at almost all medical institutions in Japan. Nafamostat mesilate, an ultrashort-acting anticoagulant, is widely used for anticoagulation. Due to restrictions imposed by national health insurance, Japanese institutions use an effluent flow rate of 15 mL/kg/h, which is lower than the standard effluent flow rate used in the West. In addition, hemofilters are believed to adsorb cytokines, and thus some institutions also proactively perform continuous renal replacement therapy with a hemofilter at an early stage for cytokine modulation in patients with sepsis. Although some aspects of these Japanese practices differ greatly from Western practices, there has not been much evidence to support current standard methods. Therefore, Japanese researchers must continue working to produce evidence for those methods, at least those that are widely used in Japan.