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  • Title: Factors Associated with Pulmonary Embolism Recurrence and the Benefits of Long-term Anticoagulant Therapy.
    Author: Anniccherico-Sanchez FJ, Alonso-Martinez JL, Urbieta-Echezarreta MA, Villar-Garcia I, Rojo-Alvaro J.
    Journal: Cardiovasc Hematol Disord Drug Targets; 2017; 17(3):205-211. PubMed ID: 28925904.
    Abstract:
    BACKGROUND: Venous thromboemboli tend to recur. However, the causative factors underlying pulmonary embolism recurrence are not well defined. AIMS: To explore the factors associated with pulmonary embolism recurrence. PATIENTS AND METHODS: Patients diagnosed with pulmonary emboli between 2004 and 2013 at our institution were enrolled. Duration of anticoagulant therapy, new episodes of venous thromboembolism, and deaths were recorded. RESULTS: Pulmonary embolism was diagnosed in 528 patients (median age: 76 years, interquartile range [IQR]: 16; male: 45%). The median follow-up time was 34 months (IQR: 52). In total, 477 patients completed ≥3 months of anticoagulation therapy. Permanent anticoagulation was indicated in 217 (45%) patients, and therapy was discontinued in 260 (55%) patients. Overall, 79 patients experienced a recurrence (5.6 per patient-year). Recurrence was significantly associated with anticoagulation discontinuation (4% vs. 27% of patients who maintained or discontinued therapy, respectively; P<0.001; 95% confidence interval -0.95, -0.86). The median duration between anticoagulation withdrawal and recurrence was 6.5 months (IQR: 23.25). Factors associated with recurrence were unprovoked pulmonary embolism (odds ratio [OR]: 0.45), a greater degree of pulmonary arterial obstruction (OR: 2.5), a delay in initiation of anticoagulation (OR: 3), and higher plasma D-dimer levels during treatment (OR: 2.3). Survival rates were improved for patients who maintained anticoagulation therapy relative to those who discontinued. CONCLUSION: Pulmonary embolism has a high recurrence rate. Permanent anticoagulant therapy should be considered for patients with idiopathic pulmonary embolism, a high thrombotic burden, and persistently elevated D-dimer levels during treatment, and for patients where therapy was initially delayed.
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