title: Derivation and validation of E/e' ratio as a parameter in the evaluation of left atrial appendage thrombus formation in patients with nonvalvular atrial fibrillation.
abstract: We sought to determine and prospectively validate, with concomitantly performed transthoracic (TTE) and transesophageal echocardiograms (TEE), a TTE-assessed E/e' threshold that can be useful in predicting left atrial appendage (LAA) thrombus in patients with nonvalvular atrial fibrillation (NVAF). The retrospective derivation cohort was comprised of 297 patients with NVAF with TTE performed within 1 year of TEE. The validation cohort was comprised of 266 prospectively enrolled patients with TTE performed immediately prior to TEE. LAA thrombus was detected by TEE in 6.4 % of patients in both cohorts. Receiver operating characteristic (ROC) analyses demonstrated a good discriminatory capacity of lateral E/e' in predicting LAA thrombus in the derivation cohort (AUC 0.72; CI 0.63-0.82; P = 0.001) which was confirmed in the validation cohort (AUC 0.83; CI 0.75-0.91; P < 0.001). In the derivation cohort, ROC curve point-coordinates identified E/e' thresholds of both 9.0 and 8.0 to be associated with 100 % sensitivity, with specificities of 36 and 30 %, respectively. An E/e' threshold of ≥8 was selected a priori for prospective validation, and was associated with 100 % sensitivity and 41 % specificity for LAA thrombus, with positive and negative predictive values of 10 and 100 %, respectively, and positive and negative likelihood ratios of 1.69 and 0, respectively. We determined and validated an E/e' threshold of 8 as a highly sensitive and useful parameter that can aid in identifying patients at very low risk for LAA thrombus and potentially obviate the need for a TEE prior to electrophysiology procedures and restoration of sinus rhythm.
authors.affiliation: Division of Cardiology, Rush University Medical Center, Chicago, IL, USA.|Division of Cardiology, Mount Sinai Hospital, Chicago, IL, USA.
authors.forename: Enrique
authors.initials: E
authors.lastname: Garcia-Sayan
authors.affiliation: Division of Cardiology, Rush University Medical Center, Chicago, IL, USA.|Division of Cardiology, Medical College of Wisconsin, Milwaukee, WI, USA.
authors.forename: Mita
authors.initials: M
authors.lastname: Patel
authors.affiliation: Division of Cardiology, Rush University Medical Center, Chicago, IL, USA.|Department of Medicine, Fairview Hospital, Cleveland, OH, USA.
authors.forename: Marwan
authors.initials: M
authors.lastname: Wassouf
authors.affiliation: Division of Cardiology, Advocate Illinois Masonic Medical Center, Chicago, IL, USA.
authors.forename: Rojina
authors.initials: R
authors.lastname: Pant
authors.affiliation: Division of Cardiology, Advocate Illinois Masonic Medical Center, Chicago, IL, USA.
authors.forename: Oliver
authors.initials: O
authors.lastname: D'Silva
authors.affiliation: Division of Cardiology, Advocate Illinois Masonic Medical Center, Chicago, IL, USA.
authors.forename: Richard F
authors.initials: RF
authors.lastname: Kehoe
authors.affiliation: Division of Cardiology, Rush University Medical Center, Chicago, IL, USA. rami_doukky@rush.edu.|Division of Adult Cardiology, John H. Stroger, Jr. Hospital of Cook County, 1901 W. Harrison St, Chicago, IL, 60612, USA. rami_doukky@rush.edu.
authors.forename: Rami
authors.initials: R
authors.lastname: Doukky
mesh_terms: D000368:Aged; D019540:Area Under Curve; D020517:Atrial Appendage / Q000000981:diagnostic imaging* / Q000503:physiopathology; D001281:Atrial Fibrillation / Q000150:complications* / Q000175:diagnosis; D015150:Echocardiography, Doppler; D017548:Echocardiography, Transesophageal; D005260:Female; D006439:Hemodynamics; D006801:Humans; D008297:Male; D008875:Middle Aged; D008943:Mitral Valve / Q000000981:diagnostic imaging* / Q000503:physiopathology; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012372:ROC Curve; D015203:Reproducibility of Results; D012189:Retrospective Studies; D013927:Thrombosis / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology
keywords: Atrial fibrillation; E/e′ ratio; Left atrial appendage thrombus; Transesophageal echocardiogram (TEE); Transthoracic echocardiogram (TTE)