Scientific Programme
Year 2021
October 2021


Abstract Title
Incidence and site of index episode of left-sided and right-sided deep vein thrombosis in patients from Tan Tock Seng Hospital - Is it different with different implications ? Ongoing study



Tan Tock Seng Hospital1

Background & Hypothesis

Incidence of deep vein thrombosis (DVT) varies among countries, with higher rates reported in Caucasian than Asian countries. Studies have reported left-sided DVT are more common but right-sided DVT may be associated with higher incidence of pulmonary embolism (PE) and malignancy. The primary objective is to investigate the incidence of left-sided DVT compared to right-sided DVT. The secondary objectives are to identify differences in patient characteristics in these two groups and evaluate DVT risk scoring in these patients.



This is a retrospective cohort study. Eligible patients with DVT diagnosis on ultrasound doppler in Tan Tock Seng Hospital from 01/1/2010 – 31/12/2018 were separated into left-sided and right-sided DVT. Baseline characteristics and risk factors for DVT were collected and compared between the two groups. Padua and Improve VTE (Venous Thromboembolism) risk scores were calculated.


At this juncture a total of 333 patients were screened and 135 eligible patients were included in analysis.

The incidence of left-sided DVT was 56.3%. Of the patients with right-sided DVT, 61% were female, 25.4% had concurrent PE, and 44.1% developed DVT during admission with at least half having high VTE risk scores.

Comparatively, 46.1% of left-sided DVT group were female, 15.8% had concurrent PE, and 23.7% developed DVT during admission. 

Discussion & Conclusion

Our preliminary findings are consistent with international studies in that left-sided DVT are more common. Right-sided DVT however, may be associated with higher incidence of PE. More data is required to further investigate the differences in risk factors.