A Study to Determine an Effective Dose of Epoetin Alfa to Decrease the Number of Units of Blood Required to be Transfused During Hip Replacement Surgery.

Major surgical procedures may require blood transfusions both during and after the operation. Agents that can increase the rate of red blood cell production would reduce the need for blood transfusions. Epoetin alfa is a genetically engineered form of a natural hormone, erythropoietin, that stimulates red blood cell production. This is a randomized, double-blind, multicenter study in patients scheduled for first time hip replacement surgery. The study compares the effectiveness of 2 different doses of epoetin alfa (20,000 units or 40,000 units per week) for reducing the need for blood transfusions during the surgery. Eligible patients will be randomly assigned to one of three treatment groups: epoetin alfa 20,000 units per week, epoetin alfa 40,000 units per week, or placebo. Patients will be treated with study medication once a week for 4 weeks before their scheduled surgery. Effectiveness will be determined by the number of transfusions required during surgery. Other factors that determine effectiveness will be: the level of hemoglobin (the oxygen-carrying component of red blood cells) and the percentage of red blood cells in the patient's blood (hematocrit) prior to surgery; the number of developing red blood cells (reticulocytes); the iron stores in the patient's blood prior to surgery; the patient's quality of life after the surgery; and the time that elapses after surgery before the patient is discharged from the hospital. Safety evaluations will include the incidence of blood clots in the deep veins, the incidence and severity of other adverse events, and changes in clinical laboratory tests, vital signs, and physical examination findings throughout the study. The study hypothesis is that patients treated with epoetin alfa before hip replacement surgery will require fewer blood transfusions during the surgery compared with patients treated with placebo, and that the lower epoetin alfa dose (20,000 units per week) is as effective as the higher epoetin alfa dose (40,000 units per week). Patients will receive 20,000 units or 40,000 units of epoetin alfa injected under the skin once weekly for 4 weeks, or a matching placebo injection containing human serum albumin.