Stable Arterial Perforators Mapping in Lower Leg Using Color-coded Doppler Sonography, Acoustic Doppler and Thermal Imaging Camera in Patients Undergoing Digital Subtraction Arteriography

Abstract

Background: Chronic defects in the lower leg present significant challenges in plastic surgery due to their diverse etiologies and association with impaired peripheral circulation. This study describes the localization of stable perforators and assesses their changing velocities after digital subtraction angiography (DSA). Methods: 10 patients with lower extremity defects requiring DSA, had undergone examinations applying standard methods. The localization of 40 stable perforators originating from three main arteries in crura was performed before and after angiography. Where stenoses or occlusions were observed, percutaneous transluminal angioplasty (PTA) was conducted, and changes in the perforator velocities following reperfusion were measured. Results: Angiographic abnormalities were observed in all cases. Prior to PTA, acoustic Dopplers detected 37 out of 40 perforators (90%), while color-coded sonography detected 35 out of 40 perforators (87.5%). After PTA, these numbers increased to 38 out of 40 (95%) and 37 out of 40 (92.5%) respectively. The mean flow characteristics included the peak systolic velocities (PSV) of 21.9 and 27.2, end-diastolic velocities (EDV) of 9.4 and 11.4 respectively. Post-intervention 16 micro vessels exhibited enlarged lumen diameters ranging from 1 to 3 mm, resulting in increased perfusion values for PSV in 85.2% (21.9/27.2) and EDV in 88.2% (9.4/11.4) of the patients. However, 2 perforators showed decreases in flow velocity after PTA. Conclusion: In most patients with chronic lower leg wounds and other comorbidities, adequate perforators for reconstruction can be identified by using conventional methods. PTA interventions positively impact blood flow in perforators, although they are not necessarily required prior to reconstruction.