Evaluation of tissue perfusion by indocyanine green fluorescein angiography in patients with neuroischemic diabetic foot syndrome after endovascular treatment

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OBJECTIVE

To evaluate the fluorescence angiography (FA) parameters with Indocyanine green (ICG) and their dynamics in diabetic foot patients after endovascular treatment.

MATERIAL AND METHODS

A single-center prospective non-blinded study was conducted with the inclusion of 47 diabetic foot patients with Chronic limb-threatening ischemia (CLTI). TcPO2 and FA-ICG were done before and after angioplasty. Zones of interest were selected for FA-ICG: the area of minimum and maximum fluorescence, the area of of the largest part of the foot. Also presented are the parameters of FA ICG: Tstart (sec) — the time of occurrence of min fluorescence (Istart, unit) in the zone of interest after the introduction of ICG; Tmax (sec) — the time to achieve max fluorescence (Imax, unit) after the introduction of ICG; Tmax -Tstart (sec) — the difference in the time of reaching Imax and Istart.

RESULTS

The median TcPO2 values indicated the presence of CLTI before revascularization. Technical success of revascularization was achieved in 45 patients. In the postoperative period, statistically significant changes in TcPO2 and Tstart, Tmax, Tmax—Tstar were obtained. A reduction in the time to reach the ICZ to the zones of interest was noted.

CONCLUSION

FA-ICG evaluate the visual and quantitative characteristics of perfusion of soft tissues of the foot. Reducing the time to reach the fluorescent substance in the areas of interest makes it possible to assume the restoration of the main blood flow to the foot. Further investigations are warranted to determine threshold values to predict wound healing and indications for revascularization.

Keywords:

fluorescent angiography

indocyanin green

near infrared

diabetic foot ulcer

TcpO2

Authors:

Dzhemilova Z.N.

Endocrinology Research Center

ORCID: 0000-0002-1129-8995

Galstyan G.R.

Endocrinology Research Center

ORCID: 0000-0001-6581-4521

Received:

06.06.2023

Accepted:

27.06.2023

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