Association Between Anemia, Bleeding, and Transfusion with Long-term Mortality Following Noncardiac Surgery.

Area of Science:

• Perioperative Medicine
• Transfusion Medicine
• Surgical Outcomes Research

Background:

• Preoperative anemia is a known risk factor for short-term mortality in noncardiac surgery.
• Optimal transfusion thresholds for patients undergoing surgery remain unclear.
• Long-term consequences of anemia, hemorrhage, and transfusions require further investigation.

Purpose of the Study:

• To determine the long-term outcomes associated with preoperative anemia, perioperative hemorrhage, and red blood cell (RBC) transfusion.
• To analyze the impact of these factors on long-term mortality after noncardiac surgery.

Main Methods:

• A long-term follow-up study of 3050 patients undergoing hip, knee, or spine surgery.
• Preoperative anemia defined as hemoglobin < 13 g/dL (men) or < 12 g/dL (women).
• Hemorrhage identified via ICD-9 codes; survival data from Social Security Death Index; logistic regression used for analysis.

Main Results:

• 17.6% of patients had preoperative anemia, 1% experienced hemorrhage, and 25% received RBC transfusions.
• Anemia (HR 3.91) and hemorrhage (HR 5.28) were independently linked to long-term mortality.
• RBC transfusion was associated with mortality (HR 3.96), with the risk attenuated by anemia severity.

Conclusions:

• Preoperative anemia, perioperative bleeding, and RBC transfusion are associated with increased long-term mortality post-noncardiac surgery.
• Strategies to reduce anemia and bleeding are recommended.
• Restrictive transfusion strategies and further research into adverse event mechanisms are warranted.