This randomized controlled trial compares a novel optical technique against the standard of care for assessing tissue perfusion in gastrointestinal surgery. Participants are randomized to receive either intraoperative imaging photoplethysmography (iPPG) or indocyanine green (ICG) fluorescence imaging. In the ICG group, the fluorescence data are comprehensively analyzed in two distinct ways: (1) Qualitative Assessment: real-time visual interpretation of the angiogram flow by the operating surgeon; and (2) Quantitative Assessment: software-based analysis of fluorescence kinetics (e.g., time-to-peak, maximum intensity) to generate objective perfusion parameters. The study aims to determine the agreement between the iPPG-based evaluations and both the qualitative and quantitative dimensions of the ICG standard.
Adult patients (age ≥ 18 years).
Scheduled to undergo an elective gastrointestinal resection requiring a primary gastro-intestinal or entero-enteric anastomosis.
Able to understand and provide written informed consent.
Known hypersensitivity or allergy to indocyanine green (ICG), iodine, or any component of the ICG formulation.
Severe hepatic impairment (e.g., Child-Pugh Class C).
Pregnancy or lactation.
Emergency surgery.
Saint Petersburg State University, Russia
Lead sponsor
Shandong Linglong Yingcheng Hospital
Collaborator
High-Tech Clinic Beloostrov
Collaborator