Quantification of intraoperative blood loss in a simulated scenario using a novel device

The study “Quantification of Intraoperative Blood Loss in a Simulated Scenario Using a Novel Device” aimed to evaluate the clinical applicability and accuracy of a novel mobile device application that uses colorimetric image correction and analysis for estimating blood loss. The study involved creating simulated scenarios of blood-filled surgical sponges and comparing the accuracy of blood loss estimation using three methods: visual estimation (V-EBL), gravimetric estimation (G-EBL), and the novel colorimetric estimation (C-EBL).

Main Outcomes

• Visual Estimation: Showed the least correlation with reference blood loss
• Gravimetric Estimation: Had a better correlation but is still prone to errors due to dilution effects
• Colorimetric Estimation: Showed the highest correlation with reference blood loss, with the smallest median overestimation and the least deviation in underestimation

Limitations

• Simulation Nature: The artificial nature of the simulation might not perfectly replicate real-world conditions, and the Hawthorne effect may have influenced participants’ behavior.
• Sponge Limitation: The application is currently only suitable for measuring blood loss on white surgical sponges.
• Environmental Control: Consistent lighting conditions were maintained, which might not always be possible in a real clinical setting.

Conclusions

Colorimetric blood loss estimation using the novel device application provides more accurate and reliable measurements compared to visual and gravimetric methods. This technology offers real-time information on blood loss, which could significantly improve perioperative monitoring and decision-making, particularly in reducing unnecessary transfusions and enhancing patient blood management. Further research is needed to assess the clinical impact of this technology on transfusion strategies.

Cite

Piekarski F, Gerdessen L, Schmitt E, Friedrichson B, Neef V, Meybohm P, Zacharowski K, Raimann FJ, Wunderer F. Quantification of Intraoperative Blood Loss in a Simulated Scenario Using a Novel Device. Shock. 2021 Jun 1;55(6):759-765. doi: 10.1097/SHK.0000000000001615. PMID: 32694398.