The Electromechanical Characteristics of Left Atrial Patients with Hypertension Complicated with Paroxysmal Atrial Fibrillation / 医学研究杂志

ABSTRACT

Objective To investigate the alteration of left atrial(LA) electromechanical characteristics of patients with hypertensivon and patients with hypertension complicated with paroxysmal atrial fibrillation(PAF). Methods By use of two-dimentional echocardiography and Doppler and tissue Doppler imaging(TDI) techniques,we mensurated and calculated the indexes representing LA structure and systolic and diastolic function and electromechanical characteristics in 30 nornal subjects(group1),25 patients with hypertension lasting less than ten years(group2),24 patients with hypertension lasting more than ten years(group3) and patients with hypertension complicated PAF(group4). Indexes representing LA electromechanical characteristics consisted of the difference in time intervals between the QRS onset and the tricuspid A wave,and the QRS onset and the mitral A wave (DQAT),electromechanical time (P-A),electromechanical time dispersion(P-Ad),the maximum P wave duration,the minimum P wave duration,and P wave dispersion (Pd=Pmax-Pmin) calculated from 12-lead surface electrocardiograms. Results The P-A3 in group 4 was much longer than that in group 1,group 2 and group 3. The P-Ad2 in group 4 was much longer than that in group 1,group 2 and group 3.Conclusion There are prolonged P-A3 and P-Ad2 in patients with hypertension complicated PAF. Some indexes,such as P-A3 and P-Ad2,perhaps can predict the onset of PAF in patients with essential hypertension better.