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Predicting postoperative haemoglobin changes after burn surgery.

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Hemoglobin (Hb) levels after burn surgery are best predicted by Hb at the end of surgery. This finding helps manage postoperative anemia and guide blood transfusion decisions in burn patients.

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Area of Science:

  • Surgery
  • Hematology
  • Burn Care

Background:

  • Burn surgery causes significant blood loss and fluid shifts, leading to rapid hemoglobin (Hb) level changes.
  • Understanding these Hb dynamics is crucial for preventing postoperative anemia and optimizing blood transfusion strategies.

Purpose of the Study:

  • To characterize Hb level changes within the first 24 hours post-burn surgery.
  • To identify predictive factors for Hb changes to guide peri-operative blood transfusion decisions.

Main Methods:

  • Retrospective cohort study of 158 patients undergoing burn surgery.
  • Hb levels were measured pre-operatively, at the end of surgery, and 16-32 hours post-operatively.
  • Peri-operative factors including end-of-surgery Hb, total body surface area operated on (TBSA-op), and fluid/blood administration were analyzed.

Main Results:

  • Mean Hb decreased from 10.6 g/dL pre-operatively to 9.2 g/dL on postoperative day 1.
  • End-of-surgery Hb and TBSA-op were strong predictors of postoperative day 1 Hb levels.
  • 75% of patients with Hb <7 g/dL at the end of surgery had Hb <7 g/dL on postoperative day 1; this occurred in 27% of those with Hb 7-9 g/dL and 0% of those with Hb ≥9 g/dL.

Conclusions:

  • Hemoglobin level at the end of burn surgery is the most significant predictor of Hb on postoperative day 1.
  • Patients with Hb <7 g/dL at the end of surgery are likely to remain anemic.
  • Approximately half of patients with end-of-surgery Hb between 7-9 g/dL and TBSA-op ≥11% may fall below the 7 g/dL transfusion trigger by postoperative day 1.