Blood flow monitoring during abdominal surgery using imaging photoplethysmography

Abstract

Intraoperative assessment of intestinal perfusion plays a primary role in making surgical decisions when performing reconstructive intestinal resections. In this work, we present recent results of measuring the full-field blood-flow distribution using an emerging technique of imaging photoplethysmography, which were obtained in an operation theater during abdominal surgeries. Visualization and quantification of the blood flow dynamics in abdominal organs is a challenging task due to significant variations in the shape and position of the organs caused by respiration and peristalsis. In our approach of imaging plethysmography, this problem was overcome by using synchronous recording of video frames and electrocardiogram with subsequent correlation analysis of the recorded data. We applied our system to assess perfusion of intestinal organs during surgeries in 54 patients with various oncological diseases. In 12 patients, the blood perfusion was assessed during the minimally invasive laparoscopic surgery (inside the abdominal cavity) by using a custom designed laparoscope. The spatial distribution of perfusion and its changes over time were successfully measured in all surgical cases. Our research has shown that Imaging photoplethysmography is reliable, low-cost, and non-invasive method for assessing perfusion in the operative theater. This is a new technology that holds great potential for the number of clinical applications. The work is supported by the Russian Science Foundation (grant No. 21-15-00265) in the part of hardware/software design and by the Government of the Russian Federation (agreement No. 075-15-2022-1110) in the part of surgical preparation.

Speaker

Alexei A. Kamshilin
Institute of Automation and Control Processes FEB RAS, Vladivostok, Russia
Russia

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