Resumo

ELIBET, Chávez et al. Dispersion of P wave dependent on wave A velocity of mitral inflow and systolic blood pressure. Rev. Colom. Cardiol. [online]. 2011, vol.18, n.1, pp.59-64. ISSN 0120-5633.

INTRODUCTION: left ventricular hypertrophy associated with worse cardiovascular prognosis increases the risk of morbidity and mortality when associated with paroxysms of atrial fibrillation. This arrhythmia can be predicted by measuring the maximum and minimum P wave duration in the electrocardiogram, and by calculating its dispersion. OBJECTIVE: to determine the electrocardiographic changes in P wave duration according to modifications in blood pressure and echocardiographic measurements in children between 8-11 years old. METHODS: we studied 90 children who underwent 12- lead surface electrocardiogram, echocardiogram and blood pressure measurements. We measured the values of maximum P, minimum P and 12-lead electrocardiogram, and calculated the P wave dispersion as the difference between its maximum and minimum duration. RESULTS: there were no significant differences by sex for the results of average P-wave dispersion The correlation coefficient (r) for systolic blood pressure was r = 0.159 with a significance of p = 0.03. A multivariate analysis showed a significant correlation between P wave dispersion and the velocity of the mitral inflow A wave(r = 0.227 and p = 0.01). CONCLUSIONS: there is a dependency between the dispersion of the P wave in the electrocardiogram and variables such as systolic blood pressure and A wave velocity of mitral inflow, fact that has been linked to risk of atrial fibrillation in adults.

Palavras-chave : P wave dispersion; A wave velocity; mitral inflow; risk factor; atrial fibrillation.

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