Abstract：Objective To investigate the occurrence and clinical significance of interatrial block (IAB) in surface ECGs of patients with paroxysmal atrial fibrillation(PAF). MethodsData of 287 patients with PAF and 133 patients as non-PAF controls in our hospital were collected. The clinical characteristics, cardiac echocardiographic indicators, and incidences of incomplete IAB(p-IAB) and high-degree IAB(a-IAB) were compared between the two groups. ResultsThe incidence of IAB in the PAF group is significantly higher than that in the control group(p-IAB: 39.4% vs. 28.3%; a-IAB: 24.4% vs. 8.3%, P<0.01). Correlation analysis shows a positive correlation between IAB and PAF(r=0.297, P<0.01). Logistics analysis shows that IAB is an independent related factor of PAF(OR=2.443, 95%CI:1.659-3.596; P<0.01). ConclusionThe incidence of IAB is higher in patients with PAF and IAB is an independent factor related to PAF. IAB analysis based on surface ECG can be considered as a clinical screening method for PAF.
