Predicting Bowel Viability With Laser Speckle Contrast Imaging: A Quantitative Assessment and Survival Study in Rats

Area of Science:

• Biomedical Engineering
• Surgical Innovation
• Gastroenterology Research

Background:

• Intraoperative bowel viability assessment is crucial but currently subjective and limited by existing methods.
• Dye-based techniques fail to capture critical reperfusion dynamics, impacting surgical decisions.
• A need exists for objective, real-time tools to determine tissue health during surgery.

Purpose of the Study:

• To establish a quantitative threshold using Laser Speckle Contrast Imaging (LSCI) for predicting bowel viability.
• To validate the predictive accuracy of LSCI in a rat model of intestinal ischemia and reperfusion.
• To introduce a novel, objective framework for intraoperative assessment of bowel viability.

Main Methods:

• A two-phase rat study was conducted, involving induced ischemia followed by reperfusion.
• Laser Speckle Contrast Imaging (LSCI) was used to quantify tissue perfusion in real-time.
• Quantitative LSCI ratios were analyzed to establish thresholds for predicting ischemic recovery versus irreversible damage.

Main Results:

• A LSCI ratio threshold of ≥0.8 was defined for viability, while <0.5 indicated irreversible damage after 60 minutes of reperfusion.
• Prospective testing in a survival model showed recovery after ≤90 minutes of ischemia, with delayed recovery at 120 minutes.
• 150 minutes of ischemia led to predicted necrosis, aligning with the established LSCI thresholds.

Conclusions:

• This study provides the first experimental evidence of LSCI's ability to predict bowel recovery post-reperfusion.
• LSCI offers a repeatable, dye-free, and objective method for intraoperative assessment of tissue viability.
• The developed quantitative LSCI framework has the potential to significantly improve surgical decision-making in cases of bowel compromise.