[MO-41] Prevalence of Deep Vein Thrombosis of Screening by Duplex Ultrasound
Venous thromboembolism (VTE) includes both deep vein thrombosis (DVT) and pulmonary embolism (PE). It is estimated that 2 million cases of VTE occur annually in the United States. VTE is widely perceived to be less common in Asian population than in Western population, but the incidence of VTE across Asian people may be rising due to aging population, dietary changes, and so on. This study aimed to investigate the prevalence of DVT patients in Japan, patient flow, treatment strategy and the proportion of PTS (Post thrombotic syndrome), known as a common complication of DVT. A retrospective, the single-center analysis examined 1137 patients who undergo venous ultrasonography in 2015. The primary measure was the prevalence of DVT, and the secondary measure was patient flow, the treatment strategy for Japanese DVT patients, the predictive factors of DVT in patient characteristics and the proportion of PTS. The overall prevalence rate of DVT was 10.3 %. The location of thrombus was 3.6%, 4.4% and 8.2% in iliac, femoral and calf vein, respectively. The complaint or purpose of the examination was perioperative screening (37%), leg edema, swelling (27%) and skin disease (8%). We observed no difference between DVT and non-DVT in sex, age, having malignancy, diabetes, obesity, CKD and previous anticoagulation. The incidence of DVT was significantly higher in the hospitalization group and having symptom group. The 51% of DVTs were received treatment, and almost all therapies were oral treatment with warfarin or DOAC. The proportion of PTS is 26%, and there was no significant difference between anticoagulation with non-anticoagulation. The proportion of DVT in Japan is assumed to be comparable with that in Western population. However, choices of therapy for DVT in Japan are limited, most of EVT procedures are not approved. We considered the efficacy of EVT for DVT from the some reports.