A patient has been hospitalized for a subtotal gastrectomy.After the procedure,an infection developed that eventually had to be treated with gentamicin,an aminoglycoside antibiotic.After 3 days of administration,oliguria occurred,and subsequent laboratory values indicated elevated BUN and creatinine levels.The patient is transferred to the critical care unit with acute tubular necrosis.The fluid that is removed each hour is not called urine; it is known as

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The fluid that is removed each hour is not called urine; it is known as ultrafiltrate.Typically,some of the ultrafiltrate is replaced through the continuous renal replacement therapy circuit by a sterile replacement fluid.Diffusion is the movement of solutes along a concentration gradient from a high concentration to a low concentration across a semipermeable membrane.Convection occurs when a pressure gradient is set up so that the water is pushed or pumped across the dialysis filter and carries the solutes from the bloodstream with it.

A Patient Has Been Hospitalized for a Subtotal Gastrectomy