Intraoperative IR imaging in the cardiac operating room

Tamas Szabo, Levente Fazekas, Ferenc Horkay, Laszlo Geller, Tibor Gyongy, Alexander Juhasz-Nagy

Research output: Contribution to journalConference article

2 Citations (Scopus)


The high blood flow rate and the considerable metabolic activity render the myocardium a possible candidate for infrared imaging. The study was aimed to test cardiothermography in evaluating arterial bypass graft patency and in assessing myocardial protection during open-heart surgery. Ten patients underwent arterial bypass grafting. Thermograms were obtained immediately before and after opening the grafts. As the bypasses were opened in hypothermia the warmer blood coming from the extracorporeal circulation readily delineated graft and coronary anatomy. By the end of the 5 min observation period, the revascularized area exhibited a temperature increase of 5.9±0.7 °C. The effectivity of antegrade cardioplegia was monitored in 38 patients undergoing either valve implantations or aorto-coronary bypass surgery. Thermographic images were taken after sternotomy, before aortic cross-clamping and after administering the 4 °C cardioplegic solution. Most of the patients (84%) displayed adequate myocardial cooling, moreover the bypass-group exhibited a more profound temperature-decrease (ΔT1000 ml: -18.7±0.9 °C vs. -17.9±0.8 °C). In conclusion, cardiothermography can visualize arterial grafts, recipient coronaries and collaterals seconds after opening the bypass, thus it properly evaluated arterial bypass graft patency. The obtained images could easily be analyzed for qualitative flow- and quantitative temperature changes. Myocardial protection could also be safely assessed with thermography.

Original languageEnglish
Pages (from-to)83-87
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - Jan 1 1999
EventProceedings of the 1999 Infrared Technology and Applications XXV - Orlando, FL, USA
Duration: Apr 5 1999Apr 9 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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