Intra- and Interatrial Asynchrony in Patients With Heart Failure

Heart failure (HF) is associated with atrial conduction delay. Color tissue Doppler imaging was used to evaluate intra- and interatrial asynchrony in patients with HF, patients with structural heart disease without HF, and controls. Twenty-three controls (mean age 65 ± 13 years), 29 patients with structural heart disease without HF (mean age 68 ± 9 years), and 29 patients with HF (mean age 67 ± 9 years) were studied. Patients had no histories of atrial fibrillation. Echocardiographic color tissue Doppler imaging of the atria was performed. Measurements below the atrioventricular plane were selected on the right atrial (RA) free wall, interatrial septum (IAS), and left atrial (LA) free wall. The time difference from the onset of the P wave to the onset of the A wave at the right atrium (P-RA), the IAS (P-IAS), and the left atrium (P-LA) was measured. Asynchrony was defined as the differences between P-IAS and P-RA (RA asynchrony), P-LA and P-IAS (LA asynchrony), and P-LA and P-RA (interatrial asynchrony). In patients with HF, a significant increase in RA asynchrony was observed compared with controls and patients without HF (30 ± 21 vs 12 ± 13 and 14 ± 15 ms, p <0.001). LA asynchrony was not different (19 ± 26 vs 25 ± 13 vs 25 ± 14 ms, p = NS). Interatrial asynchrony was significantly increased in patients with HF (49 ± 24 vs 37 ± 9 and 39 ± 17 ms, p = 0.04). There were moderate but significant correlations of RA asynchrony with log N-terminal–pro-B-type natriuretic peptide (r = 0.3, p = 0.01) and the ejection fraction (r = −0.4, p <0.001). In conclusion, in patients with HF, significant RA and interatrial asynchrony was documented, evaluated by noninvasive color tissue Doppler imaging. Asynchrony was related to N-terminal–pro-B-type natriuretic peptide and to the ejection fraction.