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The visually estimated blood volume in scaled canisters based on a simulation study.

Lara Gerdessen1, Vanessa Neef1, Florian J Raimann1

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Visual estimation of intraoperative blood loss in scaled canisters is highly inaccurate, with significant overestimations and underestimations. This common surgical practice is unreliable for quantifying blood loss.

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Area of Science:

  • Anesthesiology
  • Surgical Hemorrhage Management
  • Medical Device Accuracy

Background:

  • Visual estimation using scaled suction canisters is the standard method for quantifying intraoperative blood loss.
  • Previous research has focused on visual estimation in surgical drapes, not canister scaling.
  • The accuracy of canister scaling for blood loss quantification remains under-researched.

Purpose of the Study:

  • To evaluate the accuracy of visual estimation of blood loss in scaled suction canisters.
  • To determine the correlation between visual estimates and actual blood loss.
  • To assess the impact of clinician experience on estimation accuracy.

Main Methods:

  • A simulation study using diluted whole blood in four "bleeding" scenarios.
  • Anesthetists visually estimated blood loss from scaled suction canisters.
  • Comparison of estimated blood loss (EBL) with reference blood loss (RBL).

Main Results:

  • Median EBL was 500 ml versus RBL of 281.5 ml, with overestimations up to 1233 ml and underestimations of 138 ml.
  • Visual estimation moderately correlated with RBL (Spearman's rho: 0.818, p < 0.001).
  • Clinician experience did not significantly influence estimation accuracy (p = 0.402).

Conclusions:

  • Significant discrepancies exist between visually estimated and actual blood loss in scaled canisters.
  • Visual estimation using scaled suction canisters is not recommended due to its inaccuracy.
  • Colorimetric methods may offer a more accurate alternative for blood loss quantification.