Relationship between tissue Doppler measurements of left ventricular diastolic function and silent brain infarction in patients with non-valvular atrial fibrillation.

Abstract

Left ventricular (LV) diastolic function assessed by tissue Doppler imaging (TDI) is reported to be associated with left atrial (LA) blood stasis in patients with non-valvular atrial fibrillation (AF). This study aimed to evaluate the relationship of diastolic TDI parameters with silent brain infarction (SBI) on brain magnetic resonance imaging (MRI), and in turn the risks of subsequent stroke or dementia, in non-valvular AF patients. The study population consisted of 171 neurologically asymptomatic patients with non-valvular AF who underwent transoesophageal echocardiography (TOE) (128 men; mean age, 63 ± 11 years). We measured diastolic TDI parameters by transthoracic echocardiography, and also screened for SBI employing brain MRI. Early transmitral flow velocity (E) and mitral annular velocity by TDI (e') were measured, and E/e' ratios were calculated. An increased tertile of the E/e' ratio was significantly related to high prevalences of LA abnormalities detected by TOE (32% vs. 12% vs. 9%; P =0.002) and SBI on brain MRI (46% vs. 23% vs. 14%; P < 0.001). In multivariate logistic regression analyses after adjustment for age, hypertension, chronic kidney disease, and CHA2DS2-VASc score ≥2, the E/e' ratio ≥12.4 was found to be an independent predictor of the presence of SBI (OR 3.98, 95% CI 1.74-9.07; P = 0.001). Impaired LV diastolic function evaluated by increased E/e' ratio was closely associated with the presence of SBI independent of CHA2DS2-VASc score. TDI measurements are non-invasive and useful for risk stratification of the early stage of cerebral damages in patients with non-valvular AF.