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simplified thermographic technique has been developed to provide leg temperature profiles for diagnosis of acute DVT (DevethermR). The temperature profiles are obtained by manual scanning from the foot to the hip with an infrared radiation transducer attached to a position indicator. The diagnosis of DVT is based on side-differences in mean segmental leg temperature.  In 200 patients admitted to hospital due to the clinical suspicion of acute DVT, the leg temperature profiles were pathological in 132 of those 140 patients who proved to have DVT at phlebography which means a sensitivity of 94%. False positive results were obtained in cases with e.g. varicose veins or regional infections but these errors could be reduced if the profiles were not only numerically evaluated but also subjected to pattern analyses. A combination with venous emptying curves as obtained from venous occlusion plethysmography further improved the specificity of the noninvasive diagnostic procedure. This combination also proved favourable for the differentiation between proximal and distal leg thromboses as well as acute and old DVT. Some of the patients were investigated with thermography by a scanning camera. The results correlated closely to those obtained with the simplified thermographic technique but without improving the diagnostic sensitivity.

thrombosis and haemostasis

Noninvasiv Screening For Acute Dvt By Means Of Leg Temperature Profiles And Venous Emptying Curves As Compared To Conventional Thermography And Phlebography