Variación de voltaje de los complejos ventriculares en la fibrilación auricular y el ritmo sinusal

background: the atrial fibrillation is characterized in the electrocardiogram by absence of wave p, presence of wave f and variation in the intervals r-r. this rhythm type affects the remodeling atrial, the prognosis in the attack of the miocardio. a map of the surface atrial demonstrates presence of fronts of waves that are perpetuated which affects the height of the voltage of the ventricular complexes in relation to the intervals r-r. objectives: to register and to compare the differences of voltage of the complex r-r in the atrial fibrillation as in sinoatrial rhythm. methods: 21 electrocardiograms were evaluated with atrial fibrillation and 23 with sinoatrial rhythm, registering the voltage of the waves r, the depth of the waves q and the sum of r with q. results: of the patients with sinoatrial rhythm 56.5 % was female and the age average was of 50.7 ± 21.2 years. of the patients with atrial fibrillation 81,0 % was male and the age average was of 67.4 ±13.4 years. for wave r, as for wave q and their additions in all the derivations, excepted derivation d2 of the wave r (p= 0.095), it was found statistically significant differences (p= 0.02 or less) among the electrocardiograms of sinoatrial rhythm and atrial fibrillation. conclusions: a voltage difference exists among the registered complexes in the electrocardiogram between sinoatrial rhythm and atrial fibrillation.