Critically ill patients had been suffering form kidney injuires since time immemorial. Scientists and doctors coined different names through ages without fully understanding the pathophysiology and nature of injuries. It was coined as ‘Acute Bright's disease’ in the early twentieth century, ‘War Nephritis’ during the first world war only to be coined as acute renal failure in the mid 20th century. Acute kidney injury is a relatively new terminology coined in this century. As the understanding of the nature of the disease become clearer, newer modalities of treatment started evolving. Renal replacement therapy is one such modality. Again with experience, doctors found that this form of therapy is not only restricted in replacing the kidney function but also can be extended much beyond the boundaries of renal dysfunction. Thus, the term ‘Renal support’ instead of ‘Renal Replacement’ came into vogue. This narrative review will try to explore the variety of support the therapy gives to a critically ill patient.
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