Heart Rate Variability During Weaning Mechanical Ventilation: Guerra M et al . Heart Rate Variability During Weaning Mechanical Ventilation

INTRODUCTION: Heart rate variability (HRV) is a noninvasive method that analyzes fluctuations of intervals between heartbeats and it is related to the influences of the autonomic nervous system during weaning. AIM: To describe the behavior of cardiac autonomic modulation during the weaning process. METHOD: A search was conducted in PubMed. Initially 206 articles were found. After restriction search we identified 28 potentially eligible publications. TOPIC HIGHLIGHT Heart Rate Variability During Weaning Mechanical Ventilation Marcelle Guerra, Thabata Pidori Igreja, Tatiana Dias de Carvalho, Vitor Engracia Valenti, Luiz Carlos de Abreu, Talita Dias da Silva, David M. Garner, Rodrigo Daminello Raimundo 519 Journal of Cardiol Ther 2016 June; 3(3): 519-523 ISSN 2309-6861(print), ISSN 2312-122X(online) Online Submissions: http://www.ghrnet.org/index./jct/ doi:10.17554/j.issn.2309-6861.2016.03.101-2 Journal of Cardiology and Therapy aldosterone system, thermoregulation and the peripheral vasomotor tone. The LF/HF ratio reflects the absolute and relative changes between the sympathetic and parasympathetic components of the ANS, by characterizing the sympathetic-vagal balance on the heart[7,8]. Although the predictors of delayed extubation cannot be defined easily, the ability to identify high-risk patients and preand perioperative risk factors may help to develop surgical and medical modifications which will allow earlier extubation[5]. Weaning from mechanical ventilation to spontaneous breathing is associated with changes in the hemodynamic and autonomic nervous systems that are reflected by heart rate variability. Although cardiac dysrhythmias are an important manifestation of hemodynamic alterations, the impact of heart rate variability during weaning has not been specifically studied[9]. This research on HRV for weaning patients becomes important because its assessment during this process can provide information on pathophysiological imbalances reflected in the success or failure of weaning thus avoiding the re-intubation of patients. In this sense, we aimed to describe the behavior of the cardiac autonomic modulation during the weaning process.