Methods: In our clinic, EKOS was performed in 16 patients (12 males, 4 females; mean age 50.2±18.2 years; range 20 to 86 years). Deep venous thrombosis was present on the left lower extremity in nine and right lower extremity in seven patients. Mean duration of treatment from the onset of symptoms was 8.2±5.2 days. Additional to standard EKOS, six patients were administered additional thrombolytic via an angiocath placed in dorsal vein of ipsilateral foot in 1/3 dosage. Patients’ fibrinogen levels were monitored periodically and thrombolytic treatment was stopped under critical levels with continuation of heparin infusion. Mean duration of thrombolytic infusion was 18.4±9.8 hours (range, 6-48 hours) and mean dose of thrombolytic was 38.2±18.1 mg (range, 13-90 mg).

Results: Complete patency was obtained in seven patients (43.8%). One patient (6.3%) developed post-procedural retroperitoneal hematoma. No mortality occurred during follow-up. Mean and total durations of follow-up were 9.3±8.3 months (range, 0.9-24.3 months) and 148.7 patient/months, respectively. In the final controls, 10 patients (62.5%) were asymptomatic or mildly symptomatic, and two patients (12.5%) had post-thrombotic syndrome. Recurrence of DVT was observed in three patients (18.8%). Recurrence-free average and total durations of follow-up were 7.6±7.3 months and 122.0 patient/months, respectively. No patients had pulmonary emboli during follow-up.

Conclusion: Incidence of post-thrombotic syndrome after DVT with EKOS treatment was lower than the reported 25%-50% incidence in the literature compared to only anticoagulant usage. However, rate of asymptomatic or mildly symptomatic patients was not as high as expected. Larger scale studies and comparisons with other pharmacomechanical treatments are required to evaluate treatment efficiency.