Abstract WP362: Over-Utilization of Studies to Detect Deep Venous Thrombosis in Stroke Patients With Patent Foramen Ovale

Abstract

Introduction: Cryptogenic stroke may result from paradoxical embolism through a patent foramen ovale (PFO). However, the association between deep vein thrombosis (DVT) and cryptogenic stroke has not been proven. The objective of our study is to compare the incidence of DVT in young and old patients who presented with acute ischemic stroke and were found to have a PFO. Method: We conducted a single-centre retrospective study from January 2014-December 2018. Patients over the age of 18 with ischemic stroke and PFO, who underwent magnetic resonance venography (MRV) of the pelvis and venous doppler ultrasonography (VDU) for assessment of DVT were included. Primary endpoint was the incidence of DVT in patients that were age ≤ 60 (young group) compared to those age > 60 (old group). We further analyzed the incidence of DVT in cryptogenic stroke vs determined origin; and based on the Risk of Paradoxical Embolism (ROPE) score. Results: We included 327 patients: 200 were young (Y) and 127 were old (O). Incidence of DVT was similar for patients in Y versus those in O group (7% vs 8%). A significantly higher ROPE score ≥ 6 was seen in the Y group (71% vs 9%; p<0.001). However, there was no difference in the incidence of DVT in patients with high (9%) or low ROPE scores (8%); OR 0.75, 95% CI (0.32-1.76) p=0.517. Among cryptogenic stroke with high ROPE score and young, incidence of DVT was (7% vs 9%) in determined origin; OR 0.74, 95% CI (0.28-1.96) p=0.557. MRV pelvis detected a clot in 5% of all patients. In a multivariable regression analysis; age, gender, and presence of PFO was not associated with the incidence of DVT. Length of stay and mRS at day 7 were the same between Y and O groups. Conclusions: Detection of DVT was not associated with PFO, high ROPE scores or cryptogenic strokes. Our data indicate an over-reliance of testing for DVT, particularly MRV pelvis with contrast, in patients with PFO. Clinical studies are needed to identify other factors predictive of DVT in patients with ischemic stroke and PFO.