RESUMO
The aim of this research was analysis of hemodynamic efficacy and pumping function of the heart under conditions of various physiologic cardiostimulation regimens at rest and exercise. A total of 112 patients were examined and implanted this or that pacemaker. The mean age was 36.8 +/- 1.4 years, there were 52 male and 60 female patients. The results indicate that the most effective were the physiologic regimens, particularly those permitting an adequate increase of the pumping function at the expense of stimulation rate increment in response to exercise. When these regimens were used physical activity increased from 50 to 75% as a result of minute volume increase by 1.5-2.2 times. These results recommend a wider use of pacemakers with an automatically changing stimulation frequencies in response to exercise.
