During pregnancy, the organic systems of a woman are subjected to physiological modifications consequential to hormonal, anatomic and metabolical alterations. The most significant modification in the circulatory system is an increased cardiac output from the first three months of gestation. Women with heart disease may present with severe complications during the gestational period, because of inappropriate adaptation of her body to this hemodynamic overload, even those patients who are thought to have an appropriate functional capacity during early pregnancy. There are scant studies in the literature on the effects of local anesthetics, with and without vasoconstrictor, used in dental procedures on the cardiovascular variables of pregnant women with valvar disease, as well as on their concepti. Driven by this shortage, we decided to have this subject studied, by assessing and analyzing cardiotocographic parameters, such as fetal heart rate (FHR), fetal motility(FM) and uterine contractions (UC), in addition to blood pressure (BP) and electrocardiographic variables, such as heart rate (HR) and extrasystoles (ES), in pregnant women with rheumatic valvar disease who undergo local anesthesia with lidocaine, with and without vasoconstrictor, during restorative dental procedure. For this, 31 rheumatic heart disease patients who were in their 28th to 37th week of gestation, had 24-hour ambulatory monitoring of their BP and Holter electrocardiography (Holter-ECG), and cardiotocography (CTG), performed during: (1) baseline - 60 minutes before the procedure for BP and Holter-ECG monitoring, and 20 minutes before the procedure for CTG; (2) procedure - 56±15.5 minutes (mean±SD); (3) post-procedure - 20 minutes; and (4) mean 24-hour HR and ES measurement, and mean wake and sleeping periods BP monitoring. Variation of the above variables was analyzed in two groups, one with infusion of a 2% solution of lidocaine without vasoconstrictor (Group LNE) composed of 14 patients, and the other with infusion of a 2% solution of lidocaine with epinephrine 1:100,000 (Group LE) composed of 17 patients, randomized drawing and single blind. The investigator wise person which solution of lidocaine was being used, therefore the proper local vasoconstriction denounced if it was infiltrated or not epinephrine. The used technique was of the modified periodontal ligament (PDLm injection), by means of the equipment The Wand, infusing 1.8 ml (one cartridge) in six minutes. We use the technique of analysis of variance (ANOVA) with repeated measures to calculate the size of the sample and for the analysis and multiple interpretation of the variable in three distinct periods, on the basis of the table of Vonesh and Shork (15 patients in each group, considering a correlation enters the measures of next value the 0,4, a level of significance of 5% and to be able of test of 80%). All the variable had been initially analyzed descriptive. For the quantitative variable this analysis was made through the comment of the minimum and maximum values, and of the calculation of medium averages and shunting line-standard and. For the qualitative variable we calculate absolute and relative frequencies. The level of significance used for the tests was of 5% (p\<0,05).The maternal HR values obtained during the procedure showed a significant reduction only in comparison with the other time periods (P\<0.001)in the two groups. The comparison of the groups LE e LNE did not reveal any significant difference (P\>0.05). ES was detected in 9 (29.0%) patients, being 7 of them (41.8%) from the Group LE. BP did not show any significant difference neither between time periods, nor between groups (P\>0.05). The same occurred in the comparative analysis of the fetal parameters obtained during CTG - number of UC, level and variability from baseline of the FHR, number of accelerations of the FHR and fetal reactivity pattern. Our conclusion was that the use of 2% solution of lidocaine in association with epinephrine proved safe during dental procedure in pregnant women with rheumatic valvar cardiopathy.