Correlation between QRS Duration, Pulmonary Insufficiency and Right Ventricle Performance in Totally Corrected Tetralogy of Fallot

Objective: despite progresses in surgical correction of tetralogy of fallot, pulmonary insufficiency and progressive dysfunction of the right ventricle impress its long-term prognosis. in this study we examined the correlations between qrs duration, pulmonary insufficiency and right ventricular performance index. methods: we enrolled 57 repaired tetralogy of fallot patients. qrs duration on electrocardiogram, pulmonary regurgitation index (regurgitation time to diastolic time ratio), and right ventricular myocardial performance index were measured. findings: there was a strong inverse correlation between qrs duration and pulmonary regurgitation index. however, significant correlation did not exist between qrs duration and right ventricular myocardial performance index. qrs duration ≥160 ms predicted severe pulmonary regurgitation with 100% sensitivity and 87% specificity. conclusion: increased qrs duration can predict severity of pulmonary regurgitation.