The ratio of left atrial volume index at preatrial contraction to peak late-diastolic mitral annular velocity identified paroxysmal atrial fibrillation with 86% diagnostic accuracy and 90% PPV.
Case-Control (n=280)
Does combining left atrial volume with atrial pump function improve the diagnostic accuracy for identifying a history of paroxysmal atrial fibrillation in hypertensive patients compared to left atrial volume alone?
Absolute Event Rate: 86% vs 74%
Identifying patients at high risk for the occurrence of atrial fibrillation is one means by which subsequent thromboembolic complications may be prevented. Left atrial enlargement is associated with progression of atrial remodeling, which is a substrate for atrial fibrillation, but impaired atrial pump function is also another aspect of the remodeling. Our objective was to differentiate patients with a history of paroxysmal atrial fibrillation using echocardiography. We studied 280 hypertensive patients (age: 66+/-7 years; left ventricular ejection fraction: 65+/-8%), including 140 consecutive patients with paroxysmal atrial fibrillation and 140 age- and sex-matched control subjects. Left atrial volume was measured using the modified Simpson method at both left ventricular end systole and preatrial contraction and was indexed to body surface area. Peak late-diastolic mitral annular velocity was measured during atrial contraction using pulsed tissue Doppler imaging as an atrial pump function. Left atrial volume index measured at left ventricular end systole had a 74% diagnostic accuracy and a 71% positive predictive value for identifying patients with paroxysmal atrial fibrillation; these values for the ratio of left atrial volume index at left ventricular end systole to the peak late-diastolic mitral annular velocity were 82% and 81%, respectively, and those for the ratio of left atrial volume index at preatrial contraction to the peak late-diastolic mitral annular velocity were 86% and 90%, respectively. In conclusion, left atrial size combined with atrial pump function enabled a more accurate diagnosis of a history of paroxysmal atrial fibrillation than conventional parameters.
Toh et al. (Tue,) conducted a case-control in Hypertension and paroxysmal atrial fibrillation (n=280). Ratio of left atrial volume index at preatrial contraction to peak late-diastolic mitral annular velocity vs. Left atrial volume index at left ventricular end systole alone was evaluated on Diagnostic accuracy for identifying patients with paroxysmal atrial fibrillation. The ratio of left atrial volume index at preatrial contraction to peak late-diastolic mitral annular velocity identified paroxysmal atrial fibrillation with 86% diagnostic accuracy and 90% PPV.