Aims: To evaluate the characteristics and clinical outcome of patients with new formation of left ventricular (LV) thrombus after percutaneous edge-to-edge mitral valve repair.
Methods And Results: Between 2009 and 2012 we intended to treat 150 patients with severe mitral regurgitation (MR) with percutaneous edge-to-edge mitral valve repair in our centre. Post-procedural transthoracic echocardiographic examinations scheduled during the hospital stay revealed the new formation of LV thrombi in three out of 150 patients. All three patients suffered from end-stage systolic heart failure with a LV ejection fraction (LVEF) below 20% and were successfully treated in terms of MR reduction (reduction of at least two MR grades). No thrombus formation was observed in patients with a LVEF >20% treated in our centre (a total of 136 patients). The frequency of new LV thrombus formation in the cohort of patients with a LVEF ≤20% treated in our centre was 21% (three out of 14 patients).
Conclusions: New formation of LV thrombus was detected in patients with severely depressed LVEF (≤20%) after successful reduction of MR following percutaneous edge-to-edge mitral valve repair. This phenomenon could be a play of chance, but percutaneous edge-to-edge mitral valve repair using the MitraClip¨ system is a new procedure. Special care is needed when performing new procedures, and the unexpected post-procedural finding of LV thrombus formation in approximately 20% in this cohort is worth reporting.
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