Abstract
Objective: To evaluate by performing 24-h ambulatory blood pressure monitoring (ABPM) circadian variation of heart rate (HR) with the purpose of establish a classification of the variation of HR according to the frequency and magnitude of its decrease or increase in normotensive and untreated hypertensive patients. Design and method: 561 patients who underwent 24-h ABPM. After performing ABPM the total sample was classified in 02 groups: Normotensive patients (NP): (n = 302, 63.4% female, 49.59 ± 14.84 years, BMI: 28.03 ± 4.93 Kg/m2) and hypertensive patients (HP): (n = 259, 58.6% male, 48.94 ± 14.06 years, BMI: 29.72 ± 6.24 Kg/m2). The circadian variation of HR was calculated as the difference percentage between the average of HR during the day and night. The development of a scale of variation of HR by absolute and percentage frequencies has been the method used to classify the variation of the same. Results: In this study it was found a decrease of average heart rate during the day to night of 10 to 19% was the most frequent circadian variation in normotensive and hypertensive patients (55% and 56%, respectively), (Table 1, 2).Conclusions: Our results suggest that the circadian variation of the mean of HR between 10 to 19% represent the cutoff to establish normal range of this variable in normotensive and hypertensive patients.
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