Asociación entre strain y strain rate auricular izquierdo evaluado por speckle tracking y fibrilación auricular post cirugía de revascularización miocárdica

background: atrial fibrillation (af) is the commonest arrhythmia post coronary artery bypass grafting (cabg); it is associated to left atrial (la) dilatation and dysfunction. speckle tracking derived longitudinal strain and strain rate are novel techniques to evaluate la function. aim: to evaluate the relation of global longitudinal la strain and strain rate with the development of af in patients undergoing cabg. methods: consecutive patients undergoing cabg with lv ejection > 50% and sinus rhythm were included. clinical characteristics were tabulated and la echocar-diographic speckle tracking measurements, lass, las-ra, lars, were used to determine la strain and la strain rate. continuous ecg monitoring for 1 week was performed to assess the occurrence of af. student's t, chi square and multiple logistic regression were used for statistical analysis. results. 70 patients were studied; 26% developed post-operative af. compared to patients remaining in sinus rhythm, patients developing post-operative af had lower lass (10 ± 1,1 vs 24 ± 1,2%, p < 0,001), lasra (- 0,6 ± 0,1 vs - 1,8 ± 0,12, p < 0,001) and lasrs (0.6 ± 0.007 vs 1.2 ± 0.008, p < 0,001). independent predictors of af were lasrs (or: 6.1, 95% ci 1.3-15.2); lasra (or: 2.4, 95% ci 1.1-19.6); la volume (or: 4,67, 95% ci 1.5-19.2) and age>65 years (or: 2.31, 95% ci 1.1-15.8). conclusion.: lass , lasrs and lasra are lower in patients who develop af after cabg and lasrs and lasra were independent predictors of post-operative af. thus, la strain rate assessed by speckle tracking is useful for predicting af after cabg in addition to classic risk factors such as age and la volume.