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IN VITRO EVALUATION OF A NOVEL AUTOMATIC INTRAOPERATIVE BLOOD LOSS MONITOR.

Jiangtao Bai1, Qi Jin1, Qihui Zheng2

  • 1Department of Urology, Lanzhou University Second Hospital, Lanzhou, China.

Shock (Augusta, Ga.)
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Summary

A new automatic intraoperative blood loss monitor accurately measures surgical bleeding from free blood and sponges. This reliable device enhances patient safety by providing real-time blood loss data during surgery.

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Area of Science:

  • Medical Devices
  • Surgical Monitoring
  • Hemoglobinometry

Background:

  • Accurate intraoperative blood loss assessment is critical for patient safety.
  • Current methods for monitoring surgical blood loss lack standardization and real-time capabilities.

Purpose of the Study:

  • To evaluate the accuracy and precision of a novel automatic intraoperative blood loss monitor.
  • To assess the device's ability to measure both free blood volume and blood content in surgical sponges in real time.

Main Methods:

  • Utilized an integrated photoelectric probe to measure hemoglobin levels in free blood and sponges.
  • Employed fresh pig blood and saline to create 127 free blood and 160 sponge samples for testing.
  • Compared monitor measurements against physical measurements and performed repeated measurements for precision analysis.

Main Results:

  • The monitor demonstrated low percentage errors for free blood (5.2%) and sponges (-5.7% to -6.6%).
  • The coefficient of variation for free blood measurements was consistently below 10%.
  • Bland-Altman analysis confirmed acceptable clinical agreement between the monitor and reference methods.

Conclusions:

  • The automatic intraoperative blood loss monitor is accurate and reliable for assessing blood loss from free fluid and sponges.
  • The device exhibits high performance under simulated clinical conditions, offering a potential standard for blood loss monitoring.