Shape and Mobility of a Left Ventricular Thrombus Are Predictors of Thrombus Resolution

BACKGROUND AND OBJECTIVES: Left ventricular (LV) apical thrombi are usually present with LV dilatation, and oral anticoagulants reduce embolic risk in these patients. However, echocardiographic data regarding thrombus resolution remain limited. We studied its echocardiographic features that were associated with early resolution (within 1 month). METHODS: We performed a retrospective observational study by reviewing baseline and follow-up echocardiographic images and medical records in patients with LV apical thrombi. RESULTS: Between January 2005 and December 2017, 77 patients (59 males, mean 61±12 years old) were enrolled. Patients were classified into 2 groups based on duration of thrombus resolution: group 1 showing resolution within 1 month (n=23) and group 2 with persistence after 1 month (n=54). Thrombus size was significantly smaller in group 1 (10.7±4.2 vs. 12.1±5.5 mm, p=0.046). Grade 1 mobility (partially mobile; odds ratio [OR], 7.800; p=0.012) and grade 2 mobility (highly mobile; OR, 14.625; p=0.002) were significantly associated with the early resolution. Round thrombi were associated with early resolution than mural form (OR, 3.187; p=0.026). Multivariate analysis showed that the mobility was the most important parameter, and a highly mobile (grade 2 mobility) LV apical thrombi showed earlier resolution (OR, 12.525; p=0.013). During the follow-up over 62±44 months, 25 patients (32.5%) had ≥1 adverse clinical events. The late resolution of thrombi was associated with poor long-term clinical outcomes (hazard ratio, 5.727; p=0.020). CONCLUSIONS: Mobility of LV apical thrombi was the most important parameter associated with early thrombus resolution. Late resolution of LV apical thrombi was associated with poor long-term clinical outcomes.