Background: Deep venous thrombosis (DVT) is increasingly being managed in the outpatient setting, particularly patients deemed low-risk at presentation. The long-term outcomes of these patients remain unclear.
Aim: To determine the long-term outcomes of patients with DVT and those with raised D-dimer without DVT managed exclusively by an ambulatory care pathway.
Design: Retrospective cohort analysis.
Methods: 828 consecutive patients assessed at the Ambulatory Care Clinic of a tertiary care university hospital between 1 January and 31 December 2008 for potential lower limb DVT were analysed. Primary and secondary outcome was all-cause mortality and new diagnosis of cancer, respectively. Median follow-up was 6.4 years.
Results: The final cohort comprised 131 patients with DVT, 396 with raised D-dimer without DVT and 165 with normal D-dimer without DVT. Long-term survival was 72.5% for DVT, 75.3% for elevated D-dimer without thrombosis and 93.3% for those with normal D-dimer ( P < 0.0001). The risk of death with DVT remained significant after adjusting for age, gender, previous cancer, recent surgery and previous thromboembolism (HR 2.17, 95% CI [1.07, 4.38]). Cancer accounted for 44.4 and 37.8% of deaths within the first and second groups, respectively. 50% of cancers in the former group were diagnosed during follow-up vs. 95.1% in the latter.
Conclusion: The 5-year survival of patients with DVT managed via ambulatory care was worse than expected. An algorithm is urgently needed to identify predictors of adverse outcomes for both these patients as well as those with raised D-dimer without thrombosis.
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