Intraoperative imaging techniques to assess coronary artery bypass graft patency

Area of Science:

• Cardiovascular Surgery
• Medical Imaging
• Surgical Technology

Background:

• Graft patency is critical for successful coronary artery bypass grafting (CABG).
• Intraoperative graft failure can lead to adverse cardiac events and long-term poor outcomes.
• Conventional angiography is not feasible for real-time intraoperative assessment.

Purpose of the Study:

• To review and compare two common intraoperative modalities for graft patency assessment: intraoperative fluorescence imaging and transit-time flowmetry.
• To discuss the value and limitations of each technique in the operating room setting.

Main Methods:

• Review of current literature and clinical practices regarding intraoperative graft patency assessment.
• Comparative analysis of intraoperative fluorescence imaging and transit-time flowmetry.

Main Results:

• Both fluorescence imaging and transit-time flowmetry can reliably detect occluded grafts, which is vital for internal thoracic artery grafts.
• Neither technique consistently identifies minor, non-occlusive graft abnormalities.
• Intraoperative fluorescence imaging demonstrates higher sensitivity and fewer false positives compared to transit-time flowmetry.

Conclusions:

• Intraoperative graft patency assessment is crucial for improving CABG outcomes.
• Fluorescence imaging and transit-time flowmetry are valuable tools for detecting graft occlusion.
• Fluorescence imaging may offer superior performance in terms of sensitivity and accuracy for intraoperative graft assessment.