Utilização da Variabilidade da Frequência Cardíaca como Marcador de Prognóstico em Pacientes de Unidade de Terapia Intensiva

Utilização da VFC como marcador de prognóstico em pacientes de UTIs

Abstract

Heart rate variability (HRV) is a non-invasive diagnostic method that evaluates the autonomic modulation of the heart, being especially relevant in Intensive Care Units (ICUs), where it is crucial to obtain accurate data on the severity and prognosis of patients. The objective of this work was to evaluate patients admitted to the ICU for different diagnoses, observing autonomic changes in the different domains of HRV. List the HRV variables that demonstrated a greater probability of death and/or worse prognosis in a short period. In the HRV analysis, time series of heartbeats were used with the aid of the Polar Advanced RS800CX frequency meter, for 30 minutes. Variables in the time, frequency and non-linear domains were selected. Patients were divided into death and survivor groups. 92 patients were studied, the group of deaths consisted of 32 patients and the group of survivors consisted of 60 patients. A significant difference in heart rate variability was found between the death and survivor groups in the time, frequency and non-linear domains. It is concluded that HRV allows differentiation in the severity of health states and can act as a prognostic marker both in improving the clinical condition or probable death.