[Usefulness of spectral tissue Doppler (E/e' ratio) in the management of patients with atrial fibrillation].

Atrial fibrillation is the most common cardiac rhythm disorder encountered in daily clinical practice. It carries high morbidity and mortality rates, mainly related to sudden death, heart failure and stroke. Validation of noninvasive markers in the diagnosis of heart failure with preserved ejection fraction and risk stratification is therefore attractive in this clinical setting. The spectral tissue Doppler-derived E/e' ratio is a simple and user-friendly index which has been validated in the assessment of left ventricular diastolic pressures, regardless of rhythm. A septal E/e' >11 is associated with invasive left ventricular diastolic pressures >15mmHg in patients with atrial fibrillation. Several studies have reported the clinical relevance of abnormal values of E/e' at rest and during exercise in the diagnosis and risk stratification of heart failure with preserved ejection fraction in patients with atrial fibrillation. There is now convincing evidence that increased E/e' is associated with adverse outcome in patients with atrial fibrillation and predicts the recurrence of arrhythmia after cardioversion or catheter ablation. In conclusion, we recommend the measurement of E/e' in each patient with atrial fibrillation referred for clinically indicated transthoracic Doppler echocardiography.