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The Visually Estimated Blood Volume in Scaled Canisters Based on a Simulation Study

Lara GerdessenVanessa NeefFlorian Jürgen RaimannKai ZacharowskiFlorian Piekarski

出版	BioMed Central, 2021
URL	http://books.google.com.hk/books?id=C3XazwEACAAJ&hl=&source=gbs_api

註釋Background: The most common technique used worldwide to quantify blood loss during an operation is the visual assessment by the attending intervention team. In every operating room you will find scaled suction canisters that collect fluids from the surgical field. This scaling is commonly used by clinicians for visual assessment of intraoperative blood loss. While many studies have been conducted to quantify and improve the inaccuracy of the visual estimation method, research has focused on the estimation of blood volume in surgical drapes. The question whether and how scaling of canisters correlates with actual blood loss and how accurately clinicians estimate blood loss in scaled canisters has not been the focus of research to date. Methods: A simulation study with four “bleeding” scenarios was conducted using expired whole blood donations. After diluting the blood donations with full electrolyte solution, the sample blood loss volume (SBL) was transferred into suction canisters. The study participants then had to estimate the blood loss in all four scenarios. The difference to the reference blood loss (RBL) per scenario was analyzed. Results: Fifty-three anesthetists participated in the study. The median estimated blood loss was 500)ml (IQR 300/1150) compared to the RBL median of 281.5)ml (IQR 210.0/1022.0). Overestimations up to 1233)ml were detected. Underestimations were also observed in the range of 138)ml. The visual estimate for canisters correlated moderately with RBL (Spearman's rho: 0.818; p)