Estudo da variáveis e variabilidade da frequência cardíaca nos nascidos a termo em um hospital público de Santarém - PA

Abstract

This study aimed to evaluate the findings of anthropometric variables and heart rate variability (HRV) in full-term newborns (NBs), correlating them with the socioeconomic factors of the parents of the NBs. Santarém, in the state of Pará. This is a descriptiveanalytical study, with a quantitative, transversal, documentary, comparative and prospective approach, using information collected from the medical records of 49 NBs, as well as the follow-up during the period of 4 months of these NBs. Data on the life habits of the parents of the participating NBs were obtained from a questionnaire applied to the mothers and the use of the Polar V800 in the NBs, to obtain information about HRV. The project was approved by the Research Ethics Committee of Universidade Brasil. The parents of the newborns in the study are adults between the ages of 20 and 29, brown, of normal weight, with a monthly income of one to two minimum wages. Most mothers had a slightly elevated BMI during pregnancy, with a tendency to normalize over the postpartum months. The dietary profile of parents is characterized by the consumption of proteins, carbohydrates, fruits and various vegetables. The evolution of anthropometric measurements: weight, length, BMI (body mass index) and HC (head circumference) of the newborns, followed what was considered normal by the WHO. The HRV metrics in the time domain, frequency domain and non-linear analyzed, showed a lower activity of the autonomic nervous system in the neonatal period in relation to the subsequent periods, within the study range, which can be attributed to the stressful events during the neonatal period. adaptation to the external environment. The HRV was used as a tool to determine a healthy evolution of the homeostatic system of NBs. Correlations of HRV variables with the parents' anthropometric and socioeconomic parameters did not show statistical significance. Even so, it was possible to demonstrate the evolutionary importance of the autonomic nervous system, relating it to linear and non-linear measures of HRV, with HRV being used as a marker of the adaptive physiological impact of NBs. As a benefit of the evaluation method, we must think that the knowledge of the HRV variables of a population of NBs should be used as a strategic marker in the promotion of health and quality of life of a population.