Objective: The prevalence of arterial hypertension (AHT) in Portuguese adult population is higher than 40%. Historically defined by sustained elevation of blood pressure (BP), AHT results from hemodynamic changes characterized by cardiac output, systemic vascular resistance and/or arterial compliance abnormalities, with significant implications for diagnosis, risk stratification and treatment. Impedance cardiography (ICG) is a noninvasive method for hemodynamic profile evaluation. It allows to access risk and optimize therapy. In this study we analyzed the resistant hypertensive patients with controlled blood pressure values in order to evaluate and characterize their hemodynamic profile by ICG. Design and method: Resistant hypertensive patients without heart failure, ischemic heart disease, valvular heart disease or dysrhythmia were prospectively selected. After ICG were classified as: vasoconstrictor (systemic vascular resistance (SVR) > 2500dyn.s.cm-5.m2), hyperdynamic (cardiac index (CI) > 4.2l/min/m2 and/or heart rate (HR) > 80 cycles/min), hypervolemic (thoracic fluid (TFC) > 341/kOhm) or balanced (hemodynamic parameters below the established limit values). All patients underwent transthoracic echocardiography to exclude major changes. In this sub-analysis of patients from the IMPEDDANS study we included only those who, according to international recommendations, had office and outpatient blood pressure values within the therapeutic goals. Results: From 178 initial patients, 52 were included, 57.7% male, with 63 ± 9 years old, under 4 ± 1 antihypertensive agents. The mean hemodynamic values were: systolic blood pressure (BP) 125 ± 12, diastolic BP 75 ± 6, HR 69 ± 11, SVR 2756 ± 527, CI 2.8 ± 0.5, TFC 32 ± 4. According to the hemodynamic profile 63.7% appear to be vasoconstrictors, 13.5% hyperdynamic, 28.7% hypervolemic and 22.9% balanced. Conclusions: These results suggest that, despite polymedicated and with arterial pressure within the recommended values, the majority of patients were not hemodynamically stabilized, confirming that BP is an hemodynamic variable supported by several processes, tendentially redundant, in which inhibition of one element tends to favor the activation of another. ICG is, therefore, an useful method in the evaluation of hypertensive individuals, capable of contributing to adequate therapeutic optimization.