Prevalence of intra atrial block in mitral stenosis and predictive effect on incidence of systemic embolism

Abstract

The aim of this study was to investigate the frequency of inter-atrial block in patients with mitral stenosis with and without embolism.

Methods and materials: In a descriptive-analytical cross-sectional study, 159 patients with mitral stenosis with sinus rhythm were included in the study during 2011-2015, and 12 Leads ECG of patients was evaluated for the presence of partial or Advanced inter-atrial block by measuring P-Wave duration in all 12 leads and with appropriate magnitude. The relationship between block existence and embolism occurring with controlling confounding factors was performed using logistic regression analysis. P<0.05 was considered statistically significant.

Results: A total of 18 (11.3%) MS with cerebral embolism and 141 patients (88.7%) MS without embolism was diagnosed. The frequency of inter-atrial block was 62.3% (99 patients) in all patients with MS. This was not significant in both MS groups with and without embolism (P> 0.05). The frequency of the advance inter atrial block (A-IAB) was 16.4% and the partial inter atrial block (P-IAB) was 45.9%. The prevalence of A-IAB in MS group with embolism was significantly higher than that of the group without embolism (P<0.05). Logistic regression analysis showed that the chance of embolism occurring in A-IAB in the presence of other independent variables on embolism occurrence was 5.54 times higher than that of P-IAB group.